Preparation method of SrTiO3 / Au@CdS with tunable structure and properties under single-wavelength light assistance and SrTiO3 / Au@CdS powder
By constructing a SrTiO3/Au@CdS catalyst with the assistance of a single wavelength of light, the problem of difficulty in controlling the material structure caused by the wide wavelength range of the light source in the existing technology is solved, and a high-efficiency and low-energy-consumption light energy conversion effect is achieved.
Patent Information
- Application Number
- CN202410156512.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-02
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2044-02-02
AI Technical Summary
In the existing synthesis process of photogenerated charge-driven materials, it is difficult to achieve precise control over the structure of the target material by irradiating with light over a wide wavelength range, which limits the improvement of the light energy conversion efficiency of the catalyst system and results in high energy consumption.
A method for preparing SrTiO3/Au@CdS under single-wavelength light assistance was developed. By precisely controlling the wavelength range and power density of the light, catalysts with tunable structures were prepared, including the preparation of SrTiO3 nanoparticles and the synthesis of SrTiO3/Au@CdS nanoparticles.
It achieves precise control over photosynthetic materials, significantly improves the photocatalytic performance of catalysts, reduces energy consumption, and increases light energy conversion efficiency. The preparation process is simple and environmentally friendly.
Smart Images
Figure CN118059890B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of materials preparation, and more specifically, to a method for preparing SrTiO3 / Au@CdS with tunable structural properties under single-wavelength light assistance, and to SrTiO3 / Au@CdS powder. Background Technology
[0002] Utilizing catalysts for photoelectric energy conversion to produce green renewable energy is an effective way to simultaneously address energy shortages and environmental pollution. However, in most energy conversion systems, the rapid recombination of photogenerated charges inhibits the improvement of photoelectric conversion efficiency. Natural photosynthesis, by introducing charge transfer mediators (such as cytochrome b6f) between photosystems, constructs multi-step charge transfer pathways, promoting the efficient transport and separation of photogenerated electrons from PS II to PSI. Inspired by this, semiconductors can be used to simulate photosystems to construct highly efficient catalytic systems with multi-step charge transfer pathways. Furthermore, through the preparation of photogenerated charge-driven materials, substances used in oxidation or reduction reactions during photoelectric energy conversion can be deposited at the locations most likely to generate photogenerated holes or electrons, thereby promoting photoelectric energy conversion at the corresponding redox sites in the system. Therefore, the construction of catalytic systems based on photogenerated charge-driven materials is an effective strategy for achieving excellent photoelectric energy conversion activity. For example, Yuming Dong et al. used photogenerated electrons generated by photoexcited CdS nanorods to reduce Co in solution. 2+ and H2PO 2- Ions, synthesized Co x P is deposited on the CdS surface at sites with the most available electrons, thereby obtaining Co with an extremely high hydrogen production rate under visible light. x P / CdS catalyst (Yuming Dong et al., Appl. Catal. B Environ., 2017, 211: 245-251.).
[0003] It is well known that controlling the microstructure of materials can regulate their properties. However, in current photocharge-driven synthesis processes, the light sources chosen are often ultraviolet and / or visible light with a wide wavelength range. For example, Wingkei Ho et al. used ultraviolet light to excite TiO2 to generate photogenerated electrons and reduced (NH4)2MoS4 at room temperature to obtain MoS2 nanoclusters (Wingkei Ho et al., Langmuir, 2004, 20(14): 5865-5869.); Yani Xin et al. used visible light (λ > 420 nm) to excite ZnS@CdS porous nanotubes to generate photogenerated holes and synthesized CoO on their surface. xNanoparticles. (YaniXin et al., Sci. Bull., 2018, 63: 601-608.). Such wide wavelength range illumination often makes it difficult to achieve precise control over the target material structure, limiting further improvement in the photoelectric conversion efficiency of the final catalyst system. In natural photosynthesis, PS I and PS II, used to capture photons, have the strongest light absorption at 700 and 680 nm, respectively, and the quantum efficiency of PSII under any single wavelength excitation light in the 600-680 nm band is significantly higher than that under a single wavelength excitation light in the 500-600 nm band (Smith, Plant Physiology, Beijing Science Press, 2012.). Clearly, the selective absorption of light of different wavelengths by the photosystem controls the photogenerated charge production and the proportion of photons participating in the reaction in the photoelectric conversion system, thus affecting the light absorption and photoreaction efficiency of photosynthesis. Inspired by this, using low-energy-consumption single-wavelength light to more precisely control the material structure provides a new approach for constructing catalytic systems with controllable and excellent photoelectric conversion performance. Currently, there are no reports of using single-wavelength light-assisted synthesis to obtain semiconductor-based photocatalytic materials with tunable structure and properties.
[0004] In existing catalytic system construction based on photogenerated charge-driven materials, the light source used for driving synthesis is often ultraviolet and / or visible light with a wide wavelength range, such as synthesis using full-band illumination of 300-780 nm. This wide wavelength range illumination often makes it difficult to achieve precise control over the target material structure, and while increasing reaction energy consumption, it also limits further improvement in the light energy conversion efficiency of the final catalyst system. Summary of the Invention
[0005] The technical problem to be solved by the present invention is to provide a method for preparing SrTiO3 / Au@CdS with tunable structure and properties under single-wavelength light assistance and SrTiO3 / Au@CdS powder. It uses single-wavelength light to achieve precise and low-energy material synthesis and significantly improves the photocatalytic performance of the catalyst.
[0006] The technical solution adopted by this invention to solve its technical problem is: to construct a method for preparing SrTiO3 / Au@CdS with tunable structural properties under single-wavelength light assistance, comprising the following steps:
[0007] Preparation of S1 and SrTiO3 / Au nanoparticles: SrTiO3 nanoparticles were ultrasonically dispersed in ultrapure water, and HAuCl4 solution was added while stirring. After thorough mixing, the mixture was placed under a xenon lamp and irradiated with any single wavelength in the range of 350 to 420 nm using a bandpass filter. The irradiation wavelength range was ±15 nm. The mixture was irradiated at room temperature for 1 to 4 hours, followed by post-processing to obtain SrTiO3 / Au nanoparticles.
[0008] Preparation of S2 and SrTiO3 / Au@CdS nanoparticles: 50-200 mg of SrTiO3 / Au nanoparticles were ultrasonically dispersed in 40-60 mL of ethanol. CdCl2·2.5H2O and precipitated sulfur were then added to the mixture, and the molar ratio of Cd to S in the mixture was adjusted to 5:1-7:1. The mixture was then purged of air with nitrogen and placed under a xenon lamp. A bandpass filter was used to obtain any single wavelength of light in the range of 350-420 nm. The wavelength range of the light irradiation was ±15 nm. The mixture was irradiated at room temperature for 0.5-8 hours while stirring. After post-treatment, SrTiO3 / Au@CdS nanoparticles were obtained.
[0009] According to the above scheme, the preferred single wavelength illumination in steps S1-S2 is 380 or 400 nm.
[0010] According to the above scheme, the rated power of the xenon lamp in steps S1-S2 is 300W, and the optical power density of the single-wavelength illumination is 20-50mW / cm². 2 The preferred value is 33–41 mW / cm². 2 .
[0011] According to the above scheme, the preparation method of SrTiO3 nanoparticles in step S1 is as follows: 1,2-propanediol aqueous solution with a concentration of 0.4-0.6 mol / L is placed in an ice-water bath, and 0.25-0.27 mL of TiCl4, LiOH aqueous solution with a concentration of 2.5-4.5 mol / L, and SrCl2 aqueous solution with a concentration of 0.2-0.3 mol / L are added to it successively to obtain a mixed solution and stir for 1-2 hours. Then, the mixed solution is subjected to hydrothermal reaction at 180℃ for 24-48 hours. After centrifugation, washing, and freeze-drying, SrTiO3 nanoparticles are obtained.
[0012] According to the above scheme, in step S1, 50-200 mg of SrTiO3 nanoparticles are ultrasonically dispersed in ultrapure water, the amount of ultrapure water is 100-200 mL, and the concentration of HAuCl4 solution is 10-20 mmol / L and the amount is 0.1-0.6 mL.
[0013] According to the above scheme, in step S1-2, the post-processing step is to centrifuge the precipitate, wash it 2-3 times with deionized water and ethanol respectively, and then freeze-dry it.
[0014] The present invention also provides a method for preparing SrTiO3 / Au@CdS powder with tunable structural properties using a single wavelength light-assisted method.
[0015] The method for preparing SrTiO3 / Au@CdS with tunable structural properties under single-wavelength light assistance, and the SrTiO3 / Au@CdS powder of the present invention, have the following beneficial effects:
[0016] 1. This invention, by studying the wavelength dependence of charge production and the proportion of photons participating in the reaction during energy transfer in photosynthesis, achieves, for the first time, precise control over the structure and properties of photosynthesized materials through accurate wavelength control. This solves the problem that current methods using light sources with a wide wavelength range are insufficient for effectively controlling target materials during photosynthesis. This single-wavelength light control of synthesized materials is unprecedented and highly innovative.
[0017] 2. In this invention, a SrTiO3 / Au@CdS catalyst with excellent photocatalytic (electrocatalytic) performance was successfully prepared using low-energy single-wavelength irradiation, which is significantly higher than the performance of the corresponding catalyst powder synthesized by high-energy full-wavelength irradiation. At the same time, it is the first time that the catalyst system constructed based on single-wavelength controlled material synthesis has a much higher light energy conversion efficiency than the system obtained by high-energy full-wavelength synthesis. This provides a new idea for precise and low-energy material synthesis, as well as the design and performance improvement of high-efficiency catalysts, and has important application value. The material preparation process is also more environmentally friendly.
[0018] 3. The method for preparing the catalyst in this invention is simple, has good reproducibility, and the reaction conditions are mild and environmentally friendly. Attached Figure Description
[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:
[0020] Figure 1 SEM images of SrTiO3 / Au nanoparticles (a) and SrTiO3 / Au@CdS nanoparticles (b) prepared in Example 1 of this invention;
[0021] Figure 2 This is a SEM image of the SrTiO3 / Au@CdS nanoparticles prepared in Example 2 of this invention;
[0022] Figure 3 This is a SEM image of the SrTiO3 / Au@CdS nanoparticles prepared in Example 3 of this invention;
[0023] Figure 4 The image shows the photocatalytic hydrogen production performance of the SrTiO3 / Au@CdS nanoparticles prepared in Example 3 of this invention under visible light irradiation by a 300W xenon lamp.
[0024] Figure 5 This is a SEM image of the SrTiO3 / Au@CdS nanoparticles prepared in Comparative Example 1 of this invention. Detailed Implementation
[0025] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
[0026] Example 1
[0027] A method for preparing SrTiO3 / Au@CdS nanoparticles with tunable structure and properties under single-wavelength light assistance is disclosed, and the steps are as follows:
[0028] (1) Preparation of SrTiO3 / Au nanoparticles: 50 mg of SrTiO3 nanoparticles were ultrasonically dispersed in 150 mL of ultrapure water, and 0.15 mL of 20 mmol / L HAuCl4 solution was added while stirring. After thorough mixing, the mixture was placed under a 300 W xenon lamp and a bandpass filter was used to obtain a single wavelength of 400 nm light, with the light wavelength range being ±15 nm, and the optical power density being maintained at 33 mW / cm². 2 The mixture was stirred and irradiated at room temperature for 2 hours, then washed three times with deionized water and ethanol respectively, and freeze-dried to obtain SrTiO3 / Au nanoparticles.
[0029] (2) Preparation of SrTiO3 / Au@CdS nanoparticles: 50 mg of SrTiO3 / Au nanoparticles obtained in step (1) were ultrasonically dispersed in 40 mL of ethanol. Then, 200 mg of CdCl2·2.5H2O and 5.6 mg of precipitated sulfur were added. After that, the air in the mixture was purged with nitrogen. The mixture was placed under a 300 W xenon lamp and a bandpass filter was used to obtain a single wavelength of 365 nm light. The light wavelength range was ±15 nm, and the light power density was maintained at 20 mW / cm². 2 The particles were stirred and irradiated at room temperature for 8 hours, washed three times with deionized water and ethanol respectively, and then freeze-dried to obtain SrTiO3 / Au@CdS nanoparticles.
[0030] Figure 1 (a) is a SEM image of the SrTiO3 / Au nanoparticles prepared in this embodiment. It can be seen that the Au nanoparticles are particles with an average particle size of about 10 nm. The loading on the SrTiO3 surface is small and they do not show an aggregated morphology.
[0031] Figure 1 (b) is a SEM image of the SrTiO3 / Au@CdS nanoparticles prepared in this embodiment. It can be seen that the CdS nanoparticles encapsulate the Au nanoparticles and grow, and exhibit a dispersed sheet-like assembly structure on the SrTiO3 surface.
[0032] Using the SrTiO3 / Au@CdS nanoparticles prepared in this embodiment as a catalyst, they were added to a solution containing 32 mL of lactic acid and 48 mL of deionized water. After ultrasonic dispersion, the air in the mixture was purged with nitrogen gas, and the solution was placed in an environment with a light power density of 400 mW / cm². 2 Irradiation with a 300W xenon lamp (λ≥420nm) with an ultraviolet cutoff filter showed that the hydrogen production performance of the photocatalyst was 2.7mmol / g / h, indicating that the obtained SrTiO3 / Au@CdS nanoparticles have good photocatalytic hydrogen production activity.
[0033] Example 2
[0034] A method for preparing SrTiO3 / Au@CdS nanoparticles with tunable structure and properties under single-wavelength light assistance is disclosed, and the steps are as follows:
[0035] (1) Preparation of SrTiO3 / Au nanoparticles: 200 mg of SrTiO3 nanoparticles were ultrasonically dispersed in 200 mL of ultrapure water, and 0.6 mL of 10 mmol / L HAuCl4 solution was added while stirring. After thorough mixing, the mixture was placed under a 300 W xenon lamp and a bandpass filter was used to obtain a single wavelength of 350 nm light, with the light wavelength range being ±15 nm, and the light power density being maintained at 20 mW / cm². 2 The mixture was stirred and irradiated at room temperature for 4 hours. After being washed three times with deionized water and ethanol respectively, it was freeze-dried to obtain SrTiO3 / Au nanoparticles.
[0036] (2) Preparation of SrTiO3 / Au@CdS nanoparticles: 200 mg of SrTiO3 / Au nanoparticles obtained in step (1) were ultrasonically dispersed in 60 mL of ethanol. Then, 280 mg of CdCl2·2.5H2O and 5.6 mg of precipitated sulfur were added. After that, the air in the mixture was purged with nitrogen. The mixture was placed under a 300 W xenon lamp and a bandpass filter was used to obtain a single wavelength of 420 nm light, with the light wavelength range being ±15 nm. The light power density was maintained at 50 mW / cm². 2 The particles were stirred and irradiated at room temperature for 0.5 hours, washed three times with deionized water and ethanol respectively, and then freeze-dried to obtain SrTiO3 / Au@CdS nanoparticles.
[0037] Figure 2SEM image of the SrTiO3 / Au@CdS nanoparticles prepared in this embodiment.
[0038] It can be seen that the CdS particles synthesized on the surface of SrTiO3 do not exhibit a plate-like assembly structure, but form particle agglomerates, and their morphology is difficult to distinguish clearly from the Au nanoparticles synthesized in step (1).
[0039] Using the same method as in Example 1, the photocatalytic hydrogen production performance of the SrTiO3 / Au@CdS nanoparticles prepared in this example was measured to be much less than 0.1 mmol / g / h. These results indicate that changes in the amount of precursor used in the synthesis material and the single-wavelength illumination will affect the structure and properties of the prepared SrTiO3 / Au@CdS nanoparticles.
[0040] Example 3
[0041] A method for preparing SrTiO3 / Au@CdS nanoparticles with tunable structure and properties under single-wavelength light assistance is disclosed, and the steps are as follows:
[0042] (1) Preparation of SrTiO3 / Au nanoparticles: 50 mg of SrTiO3 nanoparticles were ultrasonically dispersed in 150 mL of ultrapure water, and 0.15 mL of 20 mmol / L HAuCl4 solution was added while stirring. After thorough mixing, the mixture was placed under a 300 W xenon lamp and a bandpass filter was used to obtain a single wavelength of 400 nm light, with the light wavelength range being ±15 nm, and the optical power density being maintained at 33 mW / cm². 2 The mixture was stirred and irradiated at room temperature for 1 hour, then washed three times with deionized water and ethanol respectively, and freeze-dried to obtain SrTiO3 / Au nanoparticles.
[0043] (2) Preparation of SrTiO3 / Au@CdS nanoparticles: 50 mg of SrTiO3 / Au nanoparticles obtained in step (1) were ultrasonically dispersed in 60 mL of ethanol. Then, 200 mg of CdCl2·2.5H2O and 5.6 mg of precipitated sulfur were added. After that, the air in the mixture was purged with nitrogen. The mixture was placed under a 300 W xenon lamp and a bandpass filter was used to obtain a single wavelength of 380 nm light. The light wavelength range was ±15 nm, and the light power density was maintained at 41 mW / cm². 2 The particles were stirred and irradiated at room temperature for 1.5 hours, washed three times with deionized water and ethanol respectively, and then freeze-dried to obtain SrTiO3 / Au@CdS nanoparticles.
[0044] Figure 3The SEM image of the SrTiO3 / Au@CdS nanoparticles prepared in this embodiment clearly shows the CdS shell with a dense aggregated structure assembled from sheet-like nanocrystals.
[0045] Figure 4 The photocatalytic hydrogen production performance of the SrTiO3 / Au@CdS nanoparticles prepared in this example was measured using the same method as in Example 1.
[0046] The photocatalytic hydrogen production performance of the SrTiO3 / Au@CdS nanoparticles prepared in this embodiment is 5.08 mmol / g / h. These results demonstrate that by adjusting a single wavelength of light, SrTiO3 / Au@CdS nanoparticles with a tunable structure can be obtained, and the photoelectric conversion efficiency of the SrTiO3 / Au@CdS nanoparticles can be further optimized.
[0047] Comparative Example 1
[0048] Au and CdS nanoparticles were synthesized using full-band (wavelength range of 300-780 nm) illumination to prepare SrTiO3 / Au@CdS nanoparticles. The steps are as follows:
[0049] (1) Preparation of SrTiO3 / Au nanoparticles: 50 mg of SrTiO3 nanoparticles were ultrasonically dispersed in 150 mL of ultrapure water, and 0.15 mL of 20 mmol / L HAuCl4 solution was added while stirring. After thorough mixing, the mixture was placed under a 300 W xenon lamp without a bandpass filter, with an illumination wavelength range of 300-780 nm and a light power density of 400 mW / cm². 2 The particles were stirred and irradiated at room temperature for 2 hours, washed three times with deionized water and ethanol respectively, and then freeze-dried to obtain SrTiO3 / Au nanoparticles.
[0050] (2) Preparation of SrTiO3 / Au@CdS nanoparticles: 50 mg of SrTiO3 / Au nanoparticles obtained in step (1) were ultrasonically dispersed in 60 mL of ethanol. Then, 200 mg of CdCl2·2.5H2O and 5.6 mg of precipitated sulfur were added. After that, the air in the mixture was purged with nitrogen. The mixture was placed under a 300 W xenon lamp without a bandpass filter, with a wavelength range of 300-780 nm and a light power density of 400 mW / cm². 2 The particles were stirred and irradiated at room temperature for 0.5 hours, washed three times with deionized water and ethanol respectively, and then freeze-dried to obtain SrTiO3 / Au@CdS nanoparticles.
[0051] Figure 5 SEM image of the SrTiO3 / Au@CdS nanoparticles prepared for this comparative example.
[0052] It can be clearly observed that a CdS shell composed of sheet-like nanocrystals was synthesized on the surface of SrTiO3.
[0053] Using the same method as in Example 1, the photocatalytic hydrogen production performance of the SrTiO3 / Au@CdS nanoparticles prepared in this comparative example was measured to be 4.61 mmol / g / h. Compared with Example 3, this demonstrates that the material synthesized using low-energy single-wavelength light can achieve significantly better photoenergy conversion activity than high-energy full-band synthesized materials.
[0054] Comparative Example 2
[0055] Au and CdS nanoparticles were synthesized using full-band (wavelength range of 300-780 nm) illumination to prepare SrTiO3 / Au@CdS nanoparticles. The steps are as follows:
[0056] (1) Preparation of SrTiO3 / Au nanoparticles: 50 mg of SrTiO3 nanoparticles were ultrasonically dispersed in 200 mL of ultrapure water, and 0.2 mL of 20 mmol / L HAuCl4 solution was added while stirring. After thorough mixing, the mixture was placed under a 300 W xenon lamp without a bandpass filter, with an illumination wavelength range of 300-780 nm and a light power density of 400 mW / cm². 2 The mixture was stirred and irradiated at room temperature for 1 hour, then washed three times with deionized water and ethanol respectively, and freeze-dried to obtain SrTiO3 / Au nanoparticles.
[0057] (2) Preparation of SrTiO3 / Au@CdS nanoparticles: 50 mg of SrTiO3 / Au nanoparticles obtained in step (1) were ultrasonically dispersed in 60 mL of ethanol. Then, 200 mg of CdCl2·2.5H2O and 5.6 mg of precipitated sulfur were added. After that, the air in the mixture was purged with nitrogen. The mixture was placed under a 300 W xenon lamp without a bandpass filter, with a wavelength range of 300-780 nm and a light power density of 400 mW / cm². 2 The particles were stirred and irradiated at room temperature for 1.5 hours, washed three times with deionized water and ethanol respectively, and then freeze-dried to obtain SrTiO3 / Au@CdS nanoparticles.
[0058] The SrTiO3 / Au nanoparticles prepared in this invention were observed by scanning electron microscopy and transmission electron microscopy. By using different single wavelengths of light for synthesis, the particle size of Au nanoparticles can be controlled to be 10-50 nm. The photocatalytic hydrogen production performance was tested by ultraviolet-visible spectrophotometer. By using different single wavelengths of light for synthesis, the light absorption characteristics and photocatalytic performance of SrTiO3 / Au nanoparticles can be controlled.
[0059] The SrTiO3 / Au@CdS nanoparticles prepared in this invention were observed by scanning electron microscopy and transmission electron microscopy to show that CdS preferentially forms a core-shell structure with Au nanoparticles. Furthermore, by using different single-wavelength light for synthesis, the formation of CdS into particle aggregates or plate-like crystal assemblies can be regulated to obtain CdS shells with a thickness of 15–50 nm. The results of UV-Vis spectrophotometry and photocatalytic hydrogen production performance tests demonstrate that selecting different single-wavelength light for synthesis can further adjust the light absorption capacity and photocatalytic performance of SrTiO3 / Au@CdS particles.
[0060] The photocatalytic performance of the SrTiO3 / Au@CdS nanoparticles prepared by this invention can be controlled by adjusting the amount of HAuCl4, precipitated sulfur, and CdCl2·2.5H2O in steps 1-2.
[0061] The SrTiO3 / Au@CdS nanoparticles prepared by this invention can be used as catalysts in catalytic processes such as photocatalytic hydrogen production, photocatalytic degradation, and photoelectrochemical cathodic protection.
[0062] This invention utilizes a single-wavelength light source to excite photogenerated electrons in SrTiO3 to synthesize core-shell Au@CdS nanoparticles. By leveraging the intrinsic properties of SrTiO3 and precisely controlling the illumination wavelength, Au@CdS particles with tunable morphology were obtained, resulting in the preparation of SrTiO3 / Au@CdS powder with excellent light energy conversion efficiency. By adjusting the illumination wavelength of the synthesized material, CdS forms a dense, plate-like crystal assembly structure at energy levels far lower than those of full-band illumination, thus achieving high-catalytic-performance powder through low-energy synthesis.
[0063] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.
Claims
1. A method for preparing SrTiO3 / Au@CdS with tunable structural properties under single-wavelength light assistance, characterized in that, Includes the following steps: Preparation of S1 and SrTiO3 / Au nanoparticles: SrTiO3 nanoparticles were ultrasonically dispersed in ultrapure water, and HAuCl4 solution was added while stirring. After thorough mixing, the mixture was placed under a xenon lamp and irradiated with any single wavelength in the range of 350 to 420 nm using a bandpass filter. The irradiation wavelength range was ±15 nm. The mixture was irradiated at room temperature for 1 to 4 hours, followed by post-processing to obtain SrTiO3 / Au nanoparticles. Preparation of S2 and SrTiO3 / Au@CdS nanoparticles: 50-200 mg of SrTiO3 / Au nanoparticles were ultrasonically dispersed in 40-60 mL of ethanol. CdCl2·2.5H2O and precipitated sulfur were then added to the mixture, and the molar ratio of Cd to S in the mixture was 5:1-7:
1. The air in the mixture was then purged with nitrogen, and the mixture was placed under a xenon lamp. A bandpass filter was used to obtain any single wavelength of light in the range of 350 to 420 nm. The light wavelength range was ±15 nm. The mixture was irradiated at room temperature for 0.5-8 hours while stirring. After post-processing, SrTiO3 / Au@CdS nanoparticles were obtained.
2. The method for preparing SrTiO3 / Au@CdS with tunable structural properties under single-wavelength light assistance according to claim 1, characterized in that, The illumination of any single wavelength in steps S1-S2 is 380 or 400 nm.
3. The method for preparing SrTiO3 / Au@CdS with tunable structural properties under single-wavelength light assistance according to claim 1, characterized in that, The xenon lamp in steps S1-S2 has a rated power of 300W, and the optical power density of the single-wavelength illumination is 20~50mW / cm². 2 .
4. The method for preparing SrTiO3 / Au@CdS with tunable structural properties under single-wavelength light assistance according to claim 1, characterized in that, The xenon lamp in steps S1-S2 has a rated power of 300W, and the optical power density of the single-wavelength illumination is 33~41mW / cm². 2 .
5. The method for preparing SrTiO3 / Au@CdS with tunable structural properties under single-wavelength light assistance according to claim 1, characterized in that, In step S1, the preparation method of SrTiO3 nanoparticles is as follows: 1,2-propanediol aqueous solution with a concentration of 0.4~0.6 mol / L is placed in an ice-water bath, and 0.25~0.27 mL of TiCl4, LiOH aqueous solution with a concentration of 2.5~4.5 mol / L, and SrCl2 aqueous solution with a concentration of 0.2~0.3 mol / L are added successively to obtain a mixed solution and stirred for 1~2 hours. Subsequently, the mixed solution is subjected to hydrothermal reaction at 180℃ for 24~48 hours. After centrifugation, washing, and freeze-drying, SrTiO3 nanoparticles are obtained.
6. The method for preparing SrTiO3 / Au@CdS with tunable structural properties under single-wavelength light assistance according to claim 1, characterized in that, In step S1, 50-200 mg of SrTiO3 nanoparticles are ultrasonically dispersed in ultrapure water, with the amount of ultrapure water being 100-200 mL and the concentration of HAuCl4 solution being 10-20 mmol / L and the amount being 0.1-0.6 mL.
7. The method for preparing SrTiO3 / Au@CdS with tunable structural properties under single-wavelength light assistance according to claim 1, characterized in that, In steps S1-S2, the post-processing step involves centrifuging to separate the precipitate, washing it 2-3 times with deionized water and ethanol respectively, and then freeze-drying it.