A method and system for preparing micro-nano materials based on tunable laser-assisted

Abstract

The present invention belongs to the technical field related to the preparation of micro-nano materials, and discloses a method and system for preparing micro-nano materials based on tunable laser-assisted preparation, the method comprising the following steps: (1) providing a precursor substance and a liquid phase solvent, and dispersing the precursor substance in the liquid phase solvent to prepare a suspension; (2) measuring the absorption spectrum of the suspension to obtain the maximum absorption peak of the light absorption intensity of the suspension and the wavelength of the light wave corresponding to the maximum absorption peak of the light absorption intensity; (3) using a tunable laser beam with a wavelength of the light wave wavelength to irradiate the suspension, thereby obtaining the micro-nano material; wherein, when the tunable laser beam interacts with the suspension, a resonance effect is generated to enhance the light absorption of the suspension. The present invention improves the utilization rate of laser energy, reduces costs, has strong applicability, and good flexibility.

Description

Technical Field

[0001] The present invention belongs to the technical field related to the preparation of micro-nano materials, and more specifically, relates to a method and system for preparing micro-nano materials based on tunable laser assistance. Background Art

[0002] Micro-nano materials are the abbreviations of materials with micron and nanometer scales. Generally speaking, in the three-dimensional scale, materials with at least one dimension between 1nm and 100nm are called nano-scale materials, and materials with a size between 1μm and 100μm are called micro-scale materials. In particular, when the material size is between 0.1μm and 1μm, it is usually called a submicron material. Due to the small size and large specific surface area of ​​micro-nano materials, compared with macroscopic conventional materials, they have many special properties, such as quantum size effect, surface effect and macroscopic quantum tunneling effect, etc., so they have important applications in many fields such as energy, chemical industry, biomedicine, optoelectronics, electromagnetics, sensing, catalysis, environmental protection, etc.

[0003] At present, the traditional preparation methods of Wiener materials mainly include physical methods and chemical methods. The physical method mainly uses photoelectric technology to make the precursor evaporate in a vacuum or inert atmosphere, and its atoms or molecules finally combine to form micro-nano particles or thin films. Typical methods include pulsed laser deposition (PLD), evaporation condensation, molecular beam epitaxy (MBE) and mechanical ball milling. The chemical method mainly uses the precursor substance to react chemically under certain conditions to generate substances such as gel or suspension, and then undergo drying, curing and other steps to form micro-nanostructured materials. Typical methods include chemical vapor deposition (CVD), liquid phase deposition, sol-gel, hydrothermal, template synthesis, molecular self-assembly, complex decomposition and electrochemical methods. These traditional methods play an important role in the preparation of specific micro-nano materials, but there are also problems such as long reaction time, uneven micro-nano material products, insufficient density, and anisotropy. For example, the high-quality, efficient and rapid preparation of micro-nano materials through new materials, new technologies and new methods is a major topic that has attracted much attention in the current materials field.

[0004] In recent years, with the development of laser technology, laser ablation has been successfully applied to material processing, welding and preparation. For example, the pulsed laser deposition (PLD) method mentioned above uses high-power pulsed laser to focus and ablate the surface of the target material to stimulate plasma plume, which is then transported to the substrate in a directional manner to finally achieve the preparation of functional thin films. It has many advantages such as good film quality and high work efficiency. At the same time, the technology of preparing micro-nano materials by laser ablation in liquid media has also gradually developed, especially in the preparation of micro-nano colloidal spheres. However, the use of laser focusing or high-power laser ablation will cause uneven distribution of product particle size due to excessive laser energy density. At the same time, the small laser focusing ablation surface will also bring about problems such as low product yield, which is not conducive to practical application.

[0005] In order to avoid the above situation, the technology of preparing micro-nano materials by non-focused and selective laser irradiation in liquid media has developed rapidly. Using the method of non-focused and selective laser irradiation in liquid media, a variety of micro-nano colloidal spheres have been successfully prepared, such as Cu, single crystal Si, Ag, B4C, Fe, Fe2O3, TiO2, ZnO, CuO and WO3. However, it has been found that these materials have a strong light absorption rate for laser energy, while other materials, such as Al2O3, MgO, ZrO2, SnO2, etc., absorb laser energy very weakly and are almost transparent. In addition, due to the current limit of laser energy density, even full-load laser energy irradiation is difficult to make these low light absorption materials melt into spheres in the liquid phase, which seriously restricts the scope of use of this technology. In addition, essentially, the absorption rate of materials depends on the physical and chemical properties of the materials themselves. Different materials have different absorption rates for laser light of a specific wavelength. However, in the actual experimental preparation process, most of the laser irradiation uses a four-band Nd:YAG solid laser with a frequency doubling function, including four output wavelengths of 1064nm, 532nm, 355nm, and 266nm. Although the infrared, visible, and ultraviolet bands are involved, each laser wavelength is fixed during the irradiation process and cannot fully meet the absorption wavelength required by the suspension, resulting in poor light absorption capacity and low light absorption rate of the suspension. This mismatch also leads to the thermal effect playing a major role in the interaction between the laser and the suspension, resulting in a waste of laser energy. If the laser energy density is too large, the surface of the prepared micro-nano material may even break and evaporate, seriously affecting the quality of the ball.

[0006] It can be seen that the existing technology has the problem that the light absorption rate of the suspension does not match the wavelength of the irradiated laser, resulting in only thermal effect when the laser interacts with the suspension, resulting in a waste of laser energy and not conducive to the preparation of micro-nano materials. Accordingly, there is a technical demand in the art to develop a method and system for preparing micro-nano materials based on tunable laser assistance that can improve the utilization rate of laser energy. Summary of the invention

[0007] In view of the above defects or improvement needs of the prior art, the present invention provides a method and system for preparing micro-nano materials based on tunable laser assistance. Based on the preparation characteristics of existing micro-nano materials, a method and system for preparing micro-nano materials based on tunable laser assistance that can improve energy utilization is studied and designed. The system solves the problem of mismatch between the light absorption rate of the suspension and the wavelength of the irradiated laser in the prior art. In addition to the thermal effect formed when the laser interacts with the suspension, the resonance effect generated when the suspension interacts with the matching laser is also well utilized, so that the light absorption capacity of the suspension is effectively enhanced, and the energy utilization efficiency is improved, which is beneficial to the preparation of micro-nano materials.

[0008] To achieve the above object, according to one aspect of the present invention, a method for preparing micro-nano materials based on tunable laser assistance is provided, the method comprising the following steps:

[0009] (1) providing a precursor material and a liquid solvent, and dispersing the precursor material in the liquid solvent to prepare a suspension;

[0010] (2) measuring the absorption spectrum of the suspension to obtain the maximum absorption peak of the light absorption intensity of the suspension and the wavelength of light corresponding to the maximum absorption peak of the light absorption intensity;

[0011] (3) Using a tunable laser beam having a wavelength equal to the wavelength of the light wave to irradiate the suspension, thereby obtaining the micro-nano material; wherein a resonance effect is generated when the tunable laser beam interacts with the suspension to enhance the light absorption of the suspension.

[0012] Furthermore, the precursor material is monocyclic or polycyclic; the liquid phase solvent is an organic solvent or an inorganic solvent.

[0013] Furthermore, after the suspension is irradiated, the suspension is centrifuged and washed and dried to obtain the micro-nano material.

[0014] Furthermore, while irradiating the suspension, the suspension is vibrated by magnetic vibration or ultrasonic vibration.

[0015] Furthermore, in step (3), a laser beam with a fixed wavelength is used to irradiate the suspension to heat the suspension.

[0016] According to another aspect of the present invention, a system for preparing micro-nano materials based on tunable laser assistance is provided, wherein the system adopts the method for preparing micro-nano materials based on tunable laser assistance as described above to prepare micro-nano materials; the system includes at least one wavelength tunable laser, and the wavelength tunable laser is used to emit the tunable laser beam having a wavelength of the light wave.

[0017] Furthermore, the system also includes a measuring component and a microprocessor, and the measuring component and the wavelength tunable laser are respectively connected to the microprocessor.

[0018] Furthermore, the measuring component is used to measure the absorption spectrum of the suspension and transmit the measured absorption spectrum to the microprocessor; the microprocessor is used to determine the maximum absorption peak of the light absorption intensity of the suspension and the wavelength of the light wave corresponding to the maximum absorption peak of the light absorption intensity according to the absorption spectrum, and then control the wavelength tunable laser to emit a tunable laser beam with a wavelength of the light wave.

[0019] Furthermore, the system also includes a suspension processing mechanism, which is used to oscillate and mix the precursor material and the liquid phase solvent so that the precursor material is evenly dispersed in the liquid phase solvent, thereby obtaining the suspension.

[0020] Furthermore, the system also includes a processing and analysis mechanism, which is used to perform feature analysis and property analysis on the micro-nano material.

[0021] In general, compared with the prior art, the method and system for preparing micro-nano materials based on tunable laser-assisted method provided by the present invention mainly have the following beneficial effects:

[0022] 1. Determine the absorption spectrum of the suspension to obtain the maximum absorption peak of the light absorption intensity of the suspension and the wavelength of light corresponding to the maximum absorption peak of the light absorption intensity, so as to optimize the wavelength of the tunable laser beam without the need for multiple experimental trials, thereby simplifying the process and improving efficiency.

[0023] 2. A tunable laser beam having a wavelength equal to the wavelength of the light wave is used to irradiate the suspension, thereby obtaining the micro-nano material, so that the suspension satisfies the matching of the output wavelength of the tunable laser, thereby forming a resonance effect, which effectively promotes the enhancement of light absorption and solves the problem in the prior art that the light absorption rate of the suspension does not match the wavelength of the irradiation laser due to the fixed wavelength of the irradiation laser.

[0024] 3. Regardless of whether the precursor material is mono- or poly-component, after being made into a suspension, the maximum absorption peak of the light absorption intensity can be displayed in the absorption spectrum. According to the needs, one or more wavelength tunable lasers are used together to maximize the resonance absorption of the suspension to the matching laser beam, and it has strong universality.

[0025] 4. The system based on tunable laser-assisted preparation of micro-nano materials has a simple structure, strong operability, is convenient and fast, and is practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of a system for preparing micro-nano materials based on tunable laser assistance provided by the first embodiment of the present invention.

[0027] Figure 2 yes Figure 1 A partial schematic diagram of the system based on tunable laser-assisted preparation of micro-nano materials.

[0028] Figure 3 It is a schematic diagram of a system for preparing micro-nano materials based on tunable laser assistance provided by the second embodiment of the present invention.

[0029] Figure 4 yes Figure 3 A partial schematic diagram of the system based on tunable laser-assisted preparation of micro-nano materials.

[0030] Figure 5 It is a schematic diagram of a system for preparing micro-nano materials based on tunable laser assistance provided by the third embodiment of the present invention.

[0031] Figure 6 yes Figure 5 A partial schematic diagram of the system based on tunable laser-assisted preparation of micro-nano materials.

[0032] Figure 7 It is a schematic flow chart of the method for preparing micro-nano materials based on tunable laser assistance provided by the present invention.

[0033] Figure 8 yes Figure 7 Schematic diagram of the absorption spectrum of the suspension involved in the method of tunable laser-assisted preparation of micro-nano materials.

[0034] Fig. 9 yes Figure 7 The method for tunable laser-assisted preparation of micro-nano materials involves the configuration intention of the suspension.

[0035] In all the drawings, the same figure numbers are used to represent the same elements or structures, among which: 1-precursor, 2-container, 3-liquid phase solvent, 4-suspension, 5-tunable laser beam, 6-fixed wavelength laser beam, 7-fixed wavelength laser, 8-wavelength tunable laser, 9-mirror, 10-long wave pass dichroic mirror, 11-bandwidth dielectric film plane mirror. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] See also Figure 7 , Figure 8 and Fig. 9 The present invention provides a method for preparing micro-nano materials based on tunable laser assistance, which comprises the following steps:

[0038] Step 1: providing a precursor material and a liquid solvent, and dispersing the precursor material in the liquid solvent to prepare a suspension.

[0039] Specifically, the precursor material can be monocyclic, that is, including only one precursor material, or can be polycyclic, that is, including multiple precursor materials at the same time; the liquid phase solvent can be an organic solvent or an inorganic solvent.

[0040] In this embodiment, when the liquid phase solvent 3 is mixed with the precursor material 1, the liquid phase solvent 3 is first placed in the container 2; then, the precursor material 1 is poured into the liquid phase solvent 3; then, magnetic oscillation or ultrasonic oscillation is used to uniformly mix and disperse the precursor material 2 in the liquid phase solvent 3 to form the suspension 4.

[0041] Step 2: measuring the absorption spectrum of the suspension to obtain the maximum absorption peak of the light absorption intensity of the suspension and the wavelength of light corresponding to the maximum absorption peak of the light absorption intensity.

[0042] Specifically, the suspension 4 is composed of a precursor substance 1 and a liquid phase solvent 3. The absorption spectrum of the suspension 4 is related to the precursor substance 1 and the liquid phase solvent 3. However, the absorption spectra of the precursor substance 1 and the liquid phase solvent 3 are different from the absorption spectrum of the suspension. The absorption spectrum of the suspension 4 has multiple absorption peaks, among which there may be more than one absorption peak with the maximum light absorption intensity. The light wavelengths corresponding to them represent the wavelengths at which the suspension 4 absorbs the most light energy.

[0043] In this embodiment, the wavelength band of the light wave corresponding to the maximum absorption peak of the light absorption intensity of the suspension is obtained according to the absorption spectrum of the suspension 4, such as infrared, visible, ultraviolet, etc., and then the wavelength of the laser beam irradiating the suspension 4 is selected.

[0044] Step three, using a tunable laser beam with a wavelength equal to the wavelength of the light wave to irradiate the suspension, thereby obtaining the micro-nano material; wherein, when the tunable laser beam interacts with the suspension, a resonance effect is generated to enhance the light absorption of the suspension.

[0045] Specifically, while the suspension is being irradiated with laser, the suspension is oscillated by magnetic oscillation or ultrasonic oscillation to prevent the suspension from settling, thereby causing insufficient laser irradiation. In addition, after the suspension is irradiated with laser, the suspension is centrifuged and washed and dried to complete the preparation of the micro-nano material.

[0046] Step 4: characterize and analyze the micro-nano material to obtain the properties of the micro-nano material.

[0047] Specifically, after the suspension is irradiated by the laser beam output by the wavelength tunable laser, the components therein will change, resulting in changes in the light absorption properties. The light absorption peak of the suspension will drift under the induction of the tunable laser beam, which is also beneficial to the suspension's absorption of the laser energy output by the fixed wavelength laser.

[0048] See also Figure 1 and Figure 2 The first embodiment of the present invention provides a system for preparing micro-nano materials based on tunable laser assistance, and the system adopts the method for preparing micro-nano materials based on tunable laser assistance as described above to prepare micro-nano materials. The system includes a measuring component, a microprocessor, a suspension processing mechanism, a fixed wavelength laser 7, a wavelength tunable laser 8, a processing and analysis mechanism, a reflector 9 and a long-wavelength pass dichroic mirror 10. In this embodiment, the fixed wavelength laser 7 is a Nd:YAG solid laser, a KrF excimer laser or a carbon dioxide laser; the wavelength tunable laser 8 is a broadband wavelength tunable laser.

[0049] The measuring component and the wavelength tunable laser 8 are respectively connected to the microprocessor. The microprocessor is used to receive the data measured by the measuring component and control the wavelength of the wavelength tunable laser 8 according to the received data.

[0050] The suspension processing mechanism is used to oscillate and mix the precursor material and the liquid phase solvent so that the precursor material is uniformly dispersed in the liquid phase solvent, thereby obtaining the suspension 4. The measuring component is used to measure the absorption spectrum of the suspension 4 and send the measured absorption spectrum to the microprocessor. The microprocessor determines the maximum absorption peak of the light absorption intensity of the suspension 4 and the wavelength corresponding to the maximum absorption peak of the light absorption intensity according to the received received spectrum, and then determines the matching wavelength of the tunable laser beam emitted by the wavelength tunable laser 8. The wavelength tunable laser 8 emits the tunable laser beam 5 with a wavelength of the matching wavelength, and the tunable laser beam 5 is reflected to the suspension 4 through the long-wave dichroic mirror 10 to irradiate the suspension 4. When the suspension 4 interacts with the matching wavelength, a resonance effect is generated, thereby effectively improving the light absorption capacity of the suspension 4. The fixed wavelength laser 7 is located above the wavelength tunable laser 8, and the reflector 9 is located above the long-wave dichroic mirror 10. The fixed-wavelength laser beam 6 emitted by the fixed-wavelength laser 7 is reflected by the reflector 9 and then irradiated onto the suspension 4 . When the fixed-wavelength laser beam 6 interacts with the suspension 4 , a thermal effect is generated to heat the suspension 4 .

[0051] In this embodiment, the central axis of the tunable laser beam 5 reflected by the long-wavelength dichroic mirror 10 coincides with the central axis of the fixed-wavelength laser beam 6 reflected by the reflector 9; the number of the tunable laser beam 5 is at least one, so that when there is only one maximum absorption peak of light absorption intensity in the absorption spectrum of the suspension 4, one wavelength tunable laser 8 is used to output a laser beam matching the wavelength of the light wave corresponding to the maximum absorption peak of the light absorption intensity, and the light absorption of the suspension 4 is effectively enhanced by utilizing the inherent resonance effect of the suspension 4 for the matching laser wavelength absorption; when there are multiple maximum absorption peaks of light absorption intensity in the absorption spectrum of the suspension 4, multiple wavelength tunable lasers 8 respectively output laser beams matching the wavelengths of the light waves corresponding to the multiple maximum absorption peaks of light absorption intensity, so as to respectively satisfy the inherent resonance effect of the suspension 4 for the absorption of each matching laser wavelength, so that the light absorption of the suspension 4 is further enhanced.

[0052] After the suspension 4 is irradiated by the tunable laser beam 5 , its composition will change, thereby changing the light absorption form. The light absorption peak of the suspension 4 will drift under the induction of the tunable laser beam 5 , which is also beneficial to the suspension 4 absorbing the laser energy output by the fixed wavelength laser 7 .

[0053] The processing and analysis mechanism is used to centrifuge, clean and dry the suspension after irradiation by the tunable laser beam to complete the preparation of the micro-nano material. At the same time, the processing and analysis mechanism is also used to characterize and analyze the micro-nano material to obtain the properties of the micro-nano material.

[0054] During operation, taking the suspension 4 of a single precursor material as an example, the maximum absorption peak of the light absorption intensity of the suspension 4 is P1 (P1>P2), and the corresponding absorption light wavelength is about 465nm, which is in the visible light band (about 400-700nm). To prevent the laser from being scattered by the container 2, the laser irradiation starts from the top of the suspension 4. Among them, the preparation of micro-nano materials using the system provided by the first embodiment of the present invention includes the following steps:

[0055] (1-1) The fixed wavelength laser 7 (e.g., a four-band Nd:YAG laser) is placed on a horizontal optical platform, the wavelength is set to 532 nm, and then turned on to output the fixed wavelength laser beam 6. The fixed wavelength laser beam 6 is reflected by the reflector 9 and incident vertically downward onto the suspension 4.

[0056] (1-2) A wavelength tunable laser 8 (e.g., an OPO laser) is placed on a lower horizontal optical platform, turned on, the wavelength is set to 465 nm, and the tunable laser beam 5 is output. The tunable laser beam 5 passes through a long-wavelength dichroic mirror 10 (e.g., Thorlabs' DMLP490, with a cutoff wavelength of 490 nm, a transmission band of 505-800 nm, an average transmittance greater than 90%, a reflection band of 380-475 nm, an average reflectivity greater than 95%, and an antireflection film is coated on the upper surface and a dichroic film is coated on the lower surface). The tunable laser beam 5 can be reflected and incident vertically downward onto the surface of the suspension 4. The fixed wavelength laser beam 6 can also pass through the long-wavelength dichroic mirror 10 and irradiate the surface of the suspension 4.

[0057] (1-3) The suspension 4 not only absorbs a portion of the energy of the fixed wavelength laser beam 6 to achieve a thermal effect, but also absorbs almost all of the energy of the tunable laser beam 5. After irradiation for a period of time, the fixed wavelength laser 7 and the wavelength tunable laser 8 are turned off, and the suspension 4 after irradiation is centrifuged, washed and dried to obtain a product, and the product is subjected to morphological characterization, component analysis and property analysis.

[0058] In particular, for the suspension 4 of the multi-component precursor material 1, when there are multiple maximum absorption peaks of light absorption intensity in the absorption spectrum of the suspension 4, multiple wavelength tunable lasers 8 are used for joint irradiation, and respectively output laser beams matching the wavelengths of light waves corresponding to the multiple maximum absorption peaks of light absorption intensity, which respectively satisfy the inherent resonance effect of the suspension 4 on the absorption of each matching laser wavelength, so that the light absorption of the suspension 4 is further enhanced.

[0059] See also Figure 3 and Figure 4 The second embodiment of the present invention provides a system for preparing micro-nano materials based on tunable laser assistance, and the system adopts the method for preparing micro-nano materials based on tunable laser assistance as described above to prepare micro-nano materials. The system includes a measuring component, a microprocessor, a suspension processing mechanism, a fixed wavelength laser 7, a wavelength tunable laser 8, a processing and analysis mechanism, a reflector 9, and a broadband dielectric film plane reflector 11. In this embodiment, the fixed wavelength laser 7 can be a Nd:YAG solid laser, a KrF excimer laser, or a carbon dioxide laser; the wavelength tunable laser 8 is a broadband wavelength tunable laser.

[0060] The measuring component and the wavelength tunable laser 8 are respectively connected to the microprocessor. The microprocessor is used to receive the data measured by the measuring component and control the wavelength of the wavelength tunable laser 8 according to the received data.

[0061] The suspension processing mechanism is used to oscillate and mix the precursor material and the liquid phase solvent so that the precursor material is uniformly dispersed in the liquid phase solvent, thereby obtaining the suspension 4. The measuring component is used to measure the absorption spectrum of the suspension 4 and send the measured absorption spectrum to the microprocessor. The microprocessor determines the maximum absorption peak of the light absorption intensity of the suspension 4 and the wavelength corresponding to the maximum absorption peak of the light absorption intensity according to the received absorption spectrum, and then determines the matching wavelength of the tunable laser beam emitted by the wavelength tunable laser 8. The wavelength tunable laser 8 emits the tunable laser beam 5 with a wavelength of the matching wavelength, and the tunable laser beam 5 is reflected to the suspension 4 by the broadband dielectric film plane reflector 11 to irradiate the suspension 4. When the suspension 4 interacts with the matching wavelength, a resonance effect is generated, thereby effectively improving the light absorption capacity of the suspension 4. The fixed wavelength laser 7 is located above the wavelength tunable laser 8, and the reflector 9 is located above the broadband dielectric film plane reflector 11. The fixed-wavelength laser beam 6 emitted by the fixed-wavelength laser 7 is reflected by the reflector 9 and irradiated onto the suspension 4 . When the fixed-wavelength laser beam 6 interacts with the suspension 4 , a thermal effect is generated to heat the suspension 4 .

[0062] In this embodiment, the central axis of the tunable laser beam 5 reflected by the broadband dielectric film plane reflector 11 does not coincide with the central axis of the fixed wavelength laser beam 6 reflected by the reflector 9; the number of the wavelength tunable laser 8 is at least one, so that when there is only one maximum absorption peak of light absorption intensity in the absorption spectrum of the suspension 4, one wavelength tunable laser 8 is used to output a laser beam matching the wavelength of the light wave corresponding to the maximum absorption peak of the light absorption intensity, and the inherent resonance effect of the suspension 4 on the laser absorption of the matching wavelength is utilized to effectively enhance the light absorption of the suspension 4; when there are multiple maximum absorption peaks of light absorption intensity in the absorption spectrum of the suspension 4, multiple wavelength tunable lasers 8 respectively output laser beams matching the wavelengths of the light waves corresponding to the multiple maximum absorption peaks of light absorption intensity, so as to respectively satisfy the inherent resonance effect of the suspension 4 on the laser absorption of each matching wavelength, so that the light absorption of the suspension 4 is further enhanced.

[0063] After the suspension 4 is irradiated by the tunable laser beam 5 , its composition will change, thereby changing the light absorption form. The light absorption peak of the suspension 4 will drift under the induction of the tunable laser beam 5 , which is also beneficial to the suspension 4 absorbing the laser energy output by the fixed wavelength laser 7 .

[0064] The processing and analysis mechanism is used to centrifuge, clean and dry the suspension after irradiation by the tunable laser beam to complete the preparation of the micro-nano material. At the same time, the processing and analysis mechanism is also used to characterize and analyze the micro-nano material to obtain the properties of the micro-nano material.

[0065] When working, the system provided by the second embodiment of the present invention is used to prepare micro-nano materials, including the following steps:

[0066] (2-1) The fixed wavelength laser 7 (e.g., a four-band Nd:YAG laser) is placed on a horizontal optical platform, the wavelength is set to 532 nm, and then turned on to output the fixed wavelength laser beam 6. The fixed wavelength laser beam 6 is reflected by the reflector 9 and incident vertically downward to directly irradiate the surface of the suspension 4.

[0067] (2-2) Place a wavelength tunable laser 8 (e.g., an OPO laser) on a lower horizontal optical platform, turn it on and set the wavelength to 465 nm to output the tunable laser beam 5. The tunable laser beam 5 passes through a broadband dielectric film plane reflector 11 (e.g., Thorlabs' BB03-E02, with a broadband dielectric film of 400 nm to 750 nm). The tunable laser 5 can be reflected and incident vertically downward, thereby irradiating the surface of the suspension 4.

[0068] (2-3) The suspension 4 not only absorbs a portion of the energy of the fixed wavelength laser beam 6 to achieve a thermal effect, but also absorbs almost all of the energy of the tunable laser beam 5. After irradiation for a period of time, the fixed wavelength laser 7 and the wavelength tunable laser 8 are turned off, and the suspension 4 after irradiation is centrifuged, cleaned and dried to obtain a product, and the product is subjected to morphological characterization, component analysis and property analysis.

[0069] In particular, for the suspension 4 of the multi-component precursor material 1, when there are multiple maximum absorption peaks of light absorption intensity in the absorption spectrum of the suspension 4, multiple wavelength tunable lasers 8 are used for joint irradiation to respectively output laser beams matching the wavelengths of light waves corresponding to the multiple maximum absorption peaks of light absorption intensity, which respectively satisfy the inherent resonance effect of the suspension 4 on the absorption of each matching laser wavelength, so that the light absorption of the suspension 4 is further enhanced.

[0070] See also Figure 5 and Figure 6 The third embodiment of the present invention provides a system for preparing micro-nano materials based on tunable laser assistance, and the system adopts the method for preparing micro-nano materials based on tunable laser assistance as described above to prepare micro-nano materials. The system includes a measuring component, a microprocessor, a suspension processing mechanism, a wavelength tunable laser 8, a processing and analysis mechanism, and a broadband dielectric film plane reflector 11. In this embodiment, the wavelength tunable laser 8 is a broadband wavelength tunable laser.

[0071] The measuring component and the wavelength tunable laser 8 are respectively connected to the microprocessor. The microprocessor is used to receive the data measured by the measuring component and control the wavelength of the wavelength tunable laser 8 according to the received data.

[0072] The suspension processing mechanism is used to oscillate and mix the precursor material and the liquid phase solvent so that the precursor material is uniformly dispersed in the liquid phase solvent, thereby obtaining the suspension 4. The measuring component is used to measure the absorption spectrum of the suspension 4 and send the measured absorption spectrum to the microprocessor. The microprocessor determines the maximum absorption peak of the light absorption intensity of the suspension 4 and the wavelength corresponding to the maximum absorption peak of the light absorption intensity according to the received absorption spectrum, and then determines the matching wavelength of the tunable laser beam emitted by the wavelength tunable laser 8. The wavelength tunable laser 8 emits the tunable laser beam 5 with a wavelength of the matching wavelength, and the tunable laser beam 5 is reflected onto the suspension 4 by the broadband dielectric film plane reflector 11 to irradiate the suspension 4. When the suspension 4 interacts with the matching wavelength, a resonance effect is generated, thereby effectively improving the light absorption capacity of the suspension 4.

[0073] In this embodiment, the number of the tunable laser beam 5 is at least one, so that when there is only one maximum absorption peak of light absorption intensity in the absorption spectrum of the suspension 4, one wavelength tunable laser 8 is used to output a laser beam matching the wavelength of the light wave corresponding to the maximum absorption peak of the light absorption intensity, and the light absorption of the suspension 4 is effectively enhanced by utilizing the inherent resonance effect of the suspension 4 absorbing the matching laser wavelength; when there are multiple maximum absorption peaks of light absorption intensity in the absorption spectrum of the suspension 4, multiple wavelength tunable lasers 8 respectively output laser beams matching the wavelengths of the light waves corresponding to the multiple maximum absorption peaks of light absorption intensity, so as to respectively satisfy the inherent resonance effect of the suspension 4 absorbing the lasers of each matching wavelength, so that the light absorption of the suspension 4 is further enhanced.

[0074] After the suspension 4 is irradiated by the tunable laser beam 5 , the composition of the suspension 4 will change, thereby causing a change in the light absorption form. The light absorption peak of the suspension 4 will drift under the induction of the tunable laser beam 5 .

[0075] The processing and analysis mechanism is used to centrifuge, clean and dry the suspension 4 after irradiation by the tunable laser beam 5 to complete the preparation of the micro-nano material. At the same time, the processing and analysis mechanism is also used to characterize and analyze the micro-nano material to obtain the properties of the micro-nano material.

[0076] When working, the system provided by the third embodiment of the present invention is used to prepare micro-nano materials, including the following steps:

[0077] (3-1) A high-power wavelength tunable laser 8 is placed on a horizontal optical platform. After it is turned on, the wavelength is set to 465nm and the tunable laser beam 5 is output. After the tunable laser beam 5 passes through a broadband dielectric film plane reflector 11 (such as Thorlabs' BB03-E02, the broadband dielectric film is 400nm~750nm), the tunable laser beam 5 can be reflected and incident vertically downward, thereby irradiating the surface of the suspension 4.

[0078] (3-2) The suspension 4 absorbs almost all of the energy of the tunable laser beam 5. After irradiation for a period of time, the wavelength tunable laser 8 is turned off, and the suspension 4 after irradiation is centrifuged, cleaned and dried to obtain a product, and the product is subjected to morphological characterization, component analysis and property analysis.

[0079] In particular, for the suspension 4 of the multi-component precursor material 1, when there are multiple light absorption intensity maximum absorption peaks in the absorption spectrum of the suspension 4, multiple wavelength tunable lasers 8 are used to work together to respectively output laser beams that match the wavelengths of light waves corresponding to the multiple light absorption intensity maximum absorption peaks. They respectively satisfy the inherent resonance effect of the suspension 4 on the laser absorption of each matching wavelength, so that the light absorption of the suspension 4 is further enhanced.

[0080] The system and method for preparing micro-nano materials based on tunable laser assistance provided by the present invention obtain the maximum absorption peak of the light absorption intensity of the suspension and the wavelength of the light wave corresponding to the maximum absorption peak of the light absorption intensity by measuring the absorption spectrum of the suspension, and then use a tunable laser beam with a wavelength of the light wave wavelength to irradiate the suspension. When the tunable laser beam interacts with the suspension, a resonance effect is generated, thereby enhancing the light absorption of the suspension and improving the utilization efficiency of laser energy. The system and method have good flexibility and strong applicability.

[0081] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing micro-nano materials based on tunable laser assistance, characterized in that: The method comprises the following steps: (1) providing a precursor material and a liquid solvent, and dispersing the precursor material in the liquid solvent to prepare a suspension; (2) measuring the absorption spectrum of the suspension to obtain the maximum absorption peak of the light absorption intensity of the suspension and the wavelength of light corresponding to the maximum absorption peak of the light absorption intensity; (3) irradiating the suspension with a tunable laser beam having a wavelength equal to the wavelength of the light wave, thereby obtaining the micro-nano material; wherein a resonance effect is generated when the tunable laser beam interacts with the suspension, thereby enhancing the light absorption of the suspension; In step (3), a laser beam with a fixed wavelength is used to irradiate the suspension to heat the suspension.

2. The method for preparing micro-nano materials based on tunable laser assistance according to claim 1, characterized in that: The precursor material is monocyclic or polycyclic; the liquid phase solvent is an organic solvent or an inorganic solvent.

3. The method for preparing micro-nano materials based on tunable laser assistance according to claim 1, characterized in that: After the suspension is irradiated, the suspension is centrifuged and washed and dried to obtain the micro-nano material.

4. The method for preparing micro-nano materials based on tunable laser assistance according to any one of claims 1 to 3, characterized in that: While irradiating the suspension, the suspension is vibrated by magnetic vibration or ultrasonic vibration.

5. A system for preparing micro-nano materials based on tunable laser-assisted method, characterized in that: The system adopts the method for preparing micro-nano materials based on tunable laser-assisted preparation of micro-nano materials as described in any one of claims 1 to 4 to prepare micro-nano materials; the system includes at least one wavelength tunable laser, and the wavelength tunable laser is used to emit the tunable laser beam with a wavelength of the light wave.

6. The system for preparing micro-nano materials based on tunable laser-assisted method according to claim 5, characterized in that: The system further comprises a measuring component and a microprocessor, wherein the measuring component and the wavelength tunable laser are respectively connected to the microprocessor.

7. The system for preparing micro-nano materials based on tunable laser-assisted method according to claim 6, characterized in that: The measuring component is used to measure the absorption spectrum of the suspension and transmit the measured absorption spectrum to the microprocessor; the microprocessor is used to determine the maximum absorption peak of the light absorption intensity of the suspension and the wavelength of the light wave corresponding to the maximum absorption peak of the light absorption intensity according to the absorption spectrum, and then control the wavelength tunable laser to emit a tunable laser beam with a wavelength of the light wave.

8. The system for preparing micro-nano materials based on tunable laser-assisted method according to claim 5, characterized in that: The system further comprises a suspension processing mechanism, which is used to oscillate and mix the precursor material and the liquid phase solvent so that the precursor material is uniformly dispersed in the liquid phase solvent, thereby obtaining the suspension.

9. The system for preparing micro-nano materials based on tunable laser-assisted method according to claim 5, characterized in that: The system also includes a processing and analysis mechanism, which is used to perform feature analysis and property analysis on the micro-nano material.

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