Two-dimensional boron oxide alkene and preparation method thereof

Abstract

The invention relates to two-dimensional boron oxide alkene and a preparation method thereof. The preparation method of the two-dimensional boron oxide alkene comprises the following steps: S1, dispersing boron powder in isopropanol to obtain a dispersion liquid; and S2, carrying out ultrasonic treatment on the dispersion liquid, and centrifuging to obtain the two-dimensional boron oxide alkene. The preparation method disclosed by the invention not only can realize regulation and control on the oxygen content of the two-dimensional boron oxide alkene, but also can realize regulation and control on the surface configuration and morphology of the two-dimensional boron oxide alkene. Besides, the preparation method is a one-step growth method, the synthesized two-dimensional boron oxide alkene not only has the characteristics of good single crystal property and strong controllability, but also has the yield of more than 30%, and is suitable for large-scale industrial production. The boron powder and the isopropanol are adopted as raw materials, so that the method is good in safety and environment-friendly, other reactants or catalysts do not need to be added, meanwhile, high-temperature and high-pressure reaction conditions are not needed, the preparation period is short, and the production cost is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of two-dimensional nanomaterial preparation, and more specifically, to a two-dimensional borophene oxide and a preparation method thereof. Background Art

[0002] Two-dimensional borophene oxide (2D BO) refers to a two-dimensional borophene nanomaterial with a partially oxidized surface. Theoretically, two-dimensional borophene oxide is a derivative that is more stable than two-dimensional borophene. 2D BO can exist stably in an atmospheric environment at 500K, and its band structure can be regulated by changing the oxidation ratio, and the transition from a metallic phase to a semiconductor phase can be achieved. Two-dimensional borophene oxide is also predicted to be a superconducting material with a critical temperature of about 10.3K, and its thermal conductivity is as high as 130Wm -1 K -1 , which is much larger than silicene (20Wm -1 K -1 ), stanene (11.6Wm -1 K -1 ), phosphorene (84Wm -1 K -1 ), arsenicene (30.4Wm -1 K -1 ) and germanium (10Wm -1 K -1 ) and other single-element 2D materials with high thermal conductivity. At the same time, theoretical calculations show that the specific capacity of lithium-ion batteries and sodium-ion batteries made of honeycomb-like two-dimensional boron oxide can reach 2137mAh g -1 and 1425mA hg -1 Sharma et al. also found that the capacitance of two-dimensional boryl oxide supercapacitors is as high as 107.63 mF cm -2 @2A -1 , and its stability is better than that of pure borophene supercapacitors. In addition, two-dimensional borophene oxide is also considered to be an efficient two-dimensional hydrogen storage material, with a theoretical mass hydrogen storage density of up to 8.3wt.%, and it can still work stably at a high temperature of 500K. In summary, two-dimensional borophene oxide is not only an ideal platform for studying cutting-edge science (fractional quantum Hall effect, anomalous quantum Hall effect and superconducting effect, etc.), but also has broad application prospects in the future fields of photoelectric detection, photovoltaics, hydrogen storage, catalysis and information storage.

[0003] In the prior art, the methods commonly used to prepare two-dimensional borylene oxide include the improved Hummer's method and molecular beam epitaxy (MBE). The use of the improved Hummer's method (see document DOI: 10.1002 / adma.201900353) to prepare two-dimensional borylene oxide is not only cumbersome in the experimental process, violent chemical reaction, and long reaction time, but also uses flammable and explosive materials, which poses a great risk of experimental safety and environmental pollution. In addition, most of the samples prepared by this method are bulk materials, with large thickness (>100nm), poor crystallinity, and due to its violent and rapid reaction, its oxygen content is difficult to control.

[0004] Molecular beam epitaxy (MBE) is another commonly used method for growing two-dimensional borophene oxide (see document DOI: 10.1038 / s41467-022-29445-8). In the MBE method, two-dimensional borophene needs to be prepared first, specifically by chemical vapor deposition (CVD) and other methods on a specific substrate to form a two-dimensional structure of boron atoms under specific conditions. Subsequently, oxygen is introduced for treatment. During this process, oxygen reacts with two-dimensional borophene, and the boron atoms in the two-dimensional borophene are gradually oxidized to form two-dimensional borophene oxide. However, the planar size of two-dimensional borophene oxide prepared by the MBE method is usually small (about 30nm), and the stability is poor after being separated from the growth substrate, resulting in low yield of two-dimensional borophene oxide.

[0005] Therefore, the existing methods for preparing two-dimensional borophene oxide have problems such as complex process flow, expensive equipment, long growth cycle, difficult to control oxygen content or low yield, which to a great extent restrict the practical application development of two-dimensional borophene oxide. Summary of the invention

[0006] The primary purpose of the present invention is to overcome the problems of the above-mentioned existing methods for preparing two-dimensional borophene oxide, such as complex process flow, expensive equipment, long growth cycle, difficult to control oxygen content or low yield, and to provide a method for preparing two-dimensional borophene oxide.

[0007] A further object of the present invention is to provide a two-dimensional borophene oxide prepared by the above preparation method.

[0008] Another object of the present invention is to provide an application of the above-mentioned two-dimensional boryl oxide in the fields of photoelectric detection, catalysis, gas sensing detection or energy storage.

[0009] The above-mentioned object of the present invention is achieved by the following technical solutions:

[0010] A method for preparing two-dimensional borylene oxide comprises the following steps:

[0011] S1. dispersing boron powder in isopropanol to obtain a dispersion;

[0012] S2. subjecting the dispersion to ultrasonic treatment and centrifugation to obtain the two-dimensional borylene oxide;

[0013] The conditions of the ultrasonic treatment in step S2 are: temperature ≤ 60°C and power 200-1000W.

[0014] The inventors of the present invention have found that two-dimensional borophene oxide can be obtained by using isopropanol as a dispersant to prepare a dispersion of boron powder, and then subjecting the dispersion to ultrasonic treatment under certain temperature and ultrasonic power conditions. The principle is that the dispersing effect of ultrasound and isopropanol can cause the boron powder to be peeled off into two-dimensional borophene, and isopropanol will not dissolve the two-dimensional borophene; then isopropanol continuously decomposes H2O2 under ultrasonic conditions, and H2O2 oxidizes the two-dimensional borophene into two-dimensional borophene oxide under the action of a certain temperature.

[0015] The preparation method of the present invention can achieve regulation of the oxygen content of two-dimensional borophene oxide by regulating the temperature or power of ultrasound. In addition, the inventors of the present invention have also found that the surface configuration and morphology of two-dimensional borophene oxide can also be regulated by regulating the temperature or power of ultrasound.

[0016] In addition, the preparation method of the present invention is a one-step growth method, and the synthesized two-dimensional boryl oxide not only has the characteristics of good single crystallinity and strong controllability, but also has a yield of more than 30%, which is suitable for large-scale industrial production. The raw materials used in the present invention are boron powder and isopropanol, which are safe and environmentally friendly, and do not require the addition of other reactants or catalysts, and do not require high temperature and high pressure reaction conditions, so that the preparation cycle can be short and the production cost is effectively reduced.

[0017] Preferably, the mass volume ratio of the boron powder and isopropanol in step S1 is 1-2 mg:1 mL.

[0018] Preferably, the boron powder in step S1 is at least one of amorphous boron powder (amorphous boron powder) or crystallized boron powder.

[0019] Preferably, the ultrasonic treatment is performed under air atmosphere.

[0020] Preferably, the temperature in step S2 is 10-50°C.

[0021] More preferably, the temperature in step S2 is 30-50° C. In this temperature range, the boron atoms of borophene are more likely to be oxidized and the formation of boron trioxide is suppressed, and the obtained two-dimensional borophene oxide has a higher oxygen content and a higher purity.

[0022] Preferably, the ultrasonic treatment time in step S2 is 0.4 to 12 hours.

[0023] The preparation method of the present invention can also achieve regulation of the oxygen content, morphology and surface configuration of the two-dimensional borophene oxide by regulating the ultrasonic time.

[0024] More preferably, the ultrasonic treatment time in step S2 is 1 to 12 hours.

[0025] Further preferably, the time in step S2 is 9 to 12 hours. Within this time range, it is more conducive to the oxidation of the boron atoms of borophene and the generation of boron trioxide is suppressed, and the obtained two-dimensional borophene oxide has a higher oxygen content and higher purity.

[0026] Preferably, the power in step S2 is 250-850W.

[0027] More preferably, the power in step S2 is 450-850 W. In this power range, the boron atoms of borophene are more likely to be oxidized and the generation of boron trioxide is suppressed, and the obtained two-dimensional borophene oxide has a higher oxygen content and a higher purity.

[0028] Preferably, the centrifugation in step S2 includes a first centrifugation and a second centrifugation performed sequentially; the conditions of the first centrifugation are: a speed of 1500-5000 rpm, a time of 10-50 min, and taking the supernatant; the conditions of the second centrifugation are: a speed of 10000-12000 rpm, a time of 5-10 min, and taking the precipitate.

[0029] More preferably, the first centrifugation is performed 3 to 5 times.

[0030] Preferably, after the centrifugation in step S2, the step of washing and removing the detergent and isopropanol is also included.

[0031] More preferably, the cleaning agent is anhydrous ethanol, and the number of times is 3 to 5 times.

[0032] More preferably, the process of removing the cleaning agent and isopropanol is: first, keep warm at 60-80°C for 4-8h; then, at a temperature of 300-400°C and a pressure of 1×10 -3 ~2×10 -2 Pa and protective atmosphere for 4 to 6 hours.

[0033] Firstly, most of the cleaning agent is removed at a relatively low temperature to prevent the cleaning agent from taking away part of the two-dimensional borylene oxide product due to its large amount and violent volatilization; then, heat preservation treatment is performed at a relatively high temperature to more thoroughly remove the residual cleaning agent and isopropanol, thereby making the obtained two-dimensional borylene oxide higher in purity, thus meeting the application scenarios with high requirements for the purity of the two-dimensional borylene oxide.

[0034] More preferably, the protective atmosphere is an inert gas atmosphere or a chemically stable gas atmosphere, and the gas flow rate is 200-500 sccm.

[0035] Further preferably, the inert gas atmosphere is an argon atmosphere or a helium atmosphere.

[0036] More preferably, the chemically stable gas atmosphere is N2 atmosphere.

[0037] Preferably, the surface configuration of the two-dimensional borophene oxide is β-rh.BO (β-rhombic) and / or h-B2O (planar honeycomb).

[0038] Preferably, the two-dimensional borophene oxide has a flake-like and ribbon-like morphology.

[0039] The surface configuration of the two-dimensional boryl oxide prepared by the preparation method of the present invention is β-rh.BO and / or h-B2O, and the morphology is flaky and ribbon-like. By controlling the conditions (including time, temperature and power) of the ultrasonic treatment, the proportion of the surface configuration of β-rh.BO and h-B2O in the two-dimensional boryl oxide can be regulated, and the proportion of the morphology of the two-dimensional boryl oxide in the two-dimensional boryl oxide can also be regulated. When the proportion of the β-rh.BO surface configuration or the ribbon morphology in the two-dimensional boryl oxide is high, the two-dimensional boryl oxide is more suitable for catalysis, gas-sensitive detection and energy storage fields; when the proportion of the h-B2O surface configuration in the two-dimensional boryl oxide is high, the two-dimensional boryl oxide is more suitable for transistors and wide-band photoelectric detection; when the proportion of the flaky morphology in the two-dimensional boryl oxide is high, the two-dimensional boryl oxide is more suitable for high-performance photoelectric detection.

[0040] More preferably, the thickness of the flake is 2-4 nm, and the diameter is 500-600 nm; the thickness of the strip is 3-5 nm, and the length is 2-5 μm.

[0041] Compared with the two-dimensional borophene prepared by the prior art (such as the improved Hummer's method), the two-dimensional borophene prepared by the preparation method of the present invention has a smaller thickness and a larger sheet diameter / longer length, that is, the scale characteristics of the two-dimensional material are more obvious, which makes the two-dimensional borophene better applicable to various scenarios.

[0042] The present invention also protects a two-dimensional borophene oxide prepared by the above preparation method.

[0043] The present invention also protects an application of the two-dimensional borophene oxide in the field of photoelectric detection, catalysis, gas-sensitive detection or energy storage.

[0044] Preferably, the catalysis is petroleum cracking catalysis, thermal catalysis or catalytic oxidation reaction.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] The preparation method of the present invention can not only realize the regulation of the oxygen content of the two-dimensional borophene oxide, but also realize the regulation of the surface configuration and morphology of the two-dimensional borophene oxide. In addition, the preparation method of the present invention is a one-step growth method, and the synthesized two-dimensional borophene oxide not only has the characteristics of good single crystallinity and strong controllability, but also has a yield of more than 30%, which is suitable for large-scale industrial production. The raw materials used in the present invention are boron powder and isopropanol, which are safe and environmentally friendly, and do not need to add other reactants or catalysts. At the same time, high temperature and high pressure reaction conditions are not required, and the preparation cycle is short, which effectively reduces the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A to E in the figure are respectively B1s high-resolution XPS spectra of two-dimensional borophene oxide prepared by the preparation methods of Examples 1 to 5; Figure 1 F is a graph showing the relationship between the atomic ratio of BB, BO and B2O3 and the ultrasonic treatment time in Examples 1 to 5.

[0048] Figure 2 A in the figure is the Raman spectra of two-dimensional borophene oxide, bulk B2O3 and borophene prepared in Examples 1, 3, 4 and 5; Figure 2 B in the figure is the atomic vibration mode diagram of the characteristic peak of two-dimensional boryl oxide.

[0049] Figure 3 A to E in the figure are respectively B1s high-resolution XPS spectra of two-dimensional borophene oxide prepared by the preparation methods of Examples 5 to 9; Figure 3 F is a graph showing the relationship between the atomic ratio of BB, BO and B2O3 and temperature in Examples 5 to 9.

[0050] Figure 4 This is a high-resolution transmission electron microscopy image of two-dimensional borophene oxide with a surface configuration of β-rh.BO phase.

[0051] Figure 5 A to E in the figure are respectively the XPS spectra of the B1s peak high resolution of the two-dimensional borophene oxide prepared by the preparation methods of Examples 8 and 10 to 13; Figure 5 F is a graph showing the relationship between the atomic ratio of BB, BO and B2O3 and the power of ultrasonic treatment in Examples 8, 10 to 13.

[0052] Figure 6 This is a high-resolution transmission electron microscopy image of two-dimensional borophene oxide with a surface configuration of h-B2O phase.

[0053] Figure 7 These are SEM electron microscope photos of the two-dimensional borophene oxide prepared in Examples 1, 4, 5, and 8. DETAILED DESCRIPTION

[0054] In order to more clearly and completely describe the technical solution of the present invention, the present invention is further described in detail through specific embodiments below. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention. Various changes can be made within the scope of the rights of the present invention.

[0055] Example 1

[0056] This embodiment provides a method for preparing two-dimensional borophene oxide, comprising the following steps:

[0057] 1) Amorphous boron powder (50 mg) was dispersed in 50 mL of isopropanol to obtain a dispersion.

[0058] 2) The dispersion was subjected to ultrasonic treatment at a temperature of 20° C., the ultrasonic treatment time was 1 h, and the ultrasonic treatment power was 850 W.

[0059] 3) The ultrasonically treated sample was subjected to a first centrifugation, the process of the first centrifugation was centrifugation at a speed of 2000 rpm for 10 min, and the supernatant was collected. The number of first centrifugation was 4 times. Then a second centrifugation was performed, the process of the second centrifugation was centrifugation at a speed of 11000 rpm for 10 min, and the precipitate was collected.

[0060] 4) The collected precipitate was placed in a drying oven at 60°C for 7 hours; then placed in a tube furnace with argon gas at a flow rate of 500 sccm at 400°C and a pressure of 1×10 -2 Pa for 4 hours to obtain two-dimensional borylene oxide.

[0061] Embodiments 2 to 5

[0062] Examples 2 to 5 provide a series of methods for preparing two-dimensional borylene oxide, which differ from Example 1 in the time of ultrasonic treatment in step 2), as shown in Table 1.

[0063] Table 1 Ultrasonic treatment time of Examples 1 to 5

[0064] Example 1 Example 2 Example 3 Example 4 Example 5 Ultrasonic treatment time / h 1 3 5 8 12

[0065] Embodiments 6 to 9

[0066] Examples 6 to 9 provide a series of methods for preparing two-dimensional borylene oxide, which differ from Example 5 in the temperature of step 2), as shown in Table 2.

[0067] Table 2 Temperature of Examples 5 to 9

[0068] Example 5 Example 6 Example 7 Example 8 Example 9 Temperature / ℃ 20 10 30 40 50

[0069] Embodiments 10 to 13

[0070] Examples 10 to 13 provide a series of methods for preparing two-dimensional borylene oxide, which differ from Example 8 in the power of the ultrasonic treatment in step 2), as shown in Table 3.

[0071] Table 3 Power of ultrasonic treatment of Example 8 and Examples 10 to 13

[0072] Example 8 Example 10 Embodiment 11 Example 12 Example 13 Ultrasonic treatment power / W 850 250 450 650 750

[0073] Comparative Example 1

[0074] The difference between this comparative example and Example 13 is that the isopropanol in 1) is replaced by acetone. The method of this comparative example cannot produce two-dimensional borophene oxide. This is because: on the one hand, the dispersibility of boron powder in acetone is not good, and it is difficult to form two-dimensional borophene through exfoliation; on the other hand, acetone cannot be decomposed to generate hydrogen peroxide, and thus cannot oxidize borophene.

[0075] Comparative Example 2

[0076] The difference between this comparative example and Example 13 is that the isopropanol in 1) is replaced by N,N-dimethylformamide doped with hydrogen peroxide. The preparation process of N,N-dimethylformamide doped with hydrogen peroxide is as follows: commercially available 33% concentration hydrogen peroxide is mixed with N,N-dimethylformamide in a volume ratio of 1:10 to obtain. The method of this comparative example cannot produce two-dimensional borophene oxide. This is because: although N,N-dimethylformamide has a good dispersing effect on boron powder, and can convert boron powder into two-dimensional borophene through exfoliation when combined with ultrasound, hydrogen peroxide added alone evaporates quickly under ultrasound and N,N-dimethylformamide cannot produce hydrogen peroxide, and thus cannot continuously oxidize two-dimensional borophene to produce two-dimensional borophene oxide.

[0077] Comparative Example 3

[0078] The difference between this comparative example and Example 13 is that the isopropanol in 1) is replaced by N-methylpyrrolidone doped with hydrogen peroxide. The preparation process of N-methylpyrrolidone doped with hydrogen peroxide is as follows: commercially available 33% concentration hydrogen peroxide is mixed with N-methylpyrrolidone in a volume ratio of 1:10 to obtain. The method of this comparative example cannot produce two-dimensional borophene oxide. This is because: although N-methylpyrrolidone has a good dispersing effect on boron powder, hydrogen peroxide added alone tends to evaporate quickly under ultrasound and N-methylpyrrolidone itself cannot produce hydrogen peroxide, and thus cannot continuously oxidize two-dimensional borophene to produce two-dimensional borophene oxide.

[0079] Performance Testing

[0080] The ratio of unoxidized boron atoms in each example sample was characterized by XPS. The formula for calculating the ratio of unoxidized boron atoms is: Where S B-B is the fitting area ratio of BB in XPS spectrum; S B-0 is the fitting area ratio of BO in the XPS spectrum; is the fitting area ratio of B2O3 in the XPS spectrum.

[0081] Figure 1 is the XPS spectra of Examples 1 to 5, wherein, Figure 1 A to E are the XPS spectra of two-dimensional borylene oxide obtained at different ultrasonic treatment times (the upper left corner of the figure is the fitting area ratio of BB, BO and B2O3); Figure 1 The relationship between the atomic ratio of F to BB, BO and B2O3 and the time of ultrasonic treatment. Figure 1 It can be seen from A to F that under the conditions of constant temperature and ultrasonic treatment power, the intensity of the BO peak increases with the extension of the ultrasonic treatment time, while the BB peak intensity decreases with the increase of the ultrasonic treatment time. Further calculation combined with the calculation formula shows that when the ultrasonic treatment power is 850 W and the temperature is 20°C, as the ultrasonic treatment time increases, the proportion of unoxidized boron atoms in two-dimensional boryl oxide decreases from 84.00 at.% (ultrasonic treatment time is 1 h) to 59.23 at.% (ultrasonic treatment time is 12 h). This shows that the preparation method of the present invention can effectively regulate the oxygen content of two-dimensional boryl oxide by controlling the ultrasonic treatment time.

[0082] Figure 2 A in the figure is the Raman spectra of the two-dimensional borophene oxide, bulk B2O3 and borophene prepared in Examples 1, 3, 4 and 5, Figure 2 The B in the figure is the atomic vibration mode diagram of the characteristic peak of two-dimensional boryl oxide. Figure 2 It can be seen that the two-dimensional borylene oxide prepared in Examples 1, 3, 4, and 5 not only exhibits the BB vibration mode, but also has a -1 A BO ​​vibration mode appears at the position of the 2D borophene oxide, so it can be determined that the 2D borophene oxide prepared in Examples 1, 3, 4, and 5 contains both the BB and BO vibration peaks of borophene oxide, further indicating that the preparation method of the present invention successfully synthesized 2D borophene oxide. The Raman spectra of other examples are similar to that of Example 1, which further indicates that the preparation method of the present invention successfully synthesized 2D borophene oxide. By comparing the Raman spectra of the 2D borophene oxide prepared in Examples 1, 3, 4, and 5, A 1g +E g The peak intensity and B 3g 1The peak intensity ratios of A 1g +E g With B 3g 1 The ratio of peak intensities increases with the increase in the proportion of oxidized boron atoms in the two-dimensional borophene oxide.

[0083] In addition, SEM and UPS tests showed that as the ultrasonic treatment time increased, the morphology of the two-dimensional borophene oxide changed from 95% ribbon-like (ultrasonic treatment time was 1 h) to 96% transparent flake-like (ultrasonic treatment time was 12 h), and the band gap gradually increased. This indicates that the preparation method of the present invention can effectively regulate the morphology and band gap of two-dimensional borophene oxide by controlling the ultrasonic treatment time.

[0084] Figure 3 is the XPS spectra of Examples 5 to 9, wherein, Figure 3 A~E are the XPS spectra of two-dimensional borylene oxide prepared at different temperatures (the upper left corner of the figure is the fitting area ratio of BB, BO and B2O3); Figure 3 The relationship between the atomic ratio of F to BB, BO and B2O3 and the temperature. Figure 3 It can be seen from A to F that under the condition that the power and time of ultrasonic treatment remain unchanged, the intensity of the BO peak first increases and then weakens with the increase of temperature, while the intensity of the BB peak weakens with the increase of temperature. Further calculations combined with the calculation formula show that when the ultrasonic treatment time is 12h and the ultrasonic treatment power is 850W, as the temperature increases, the proportion of unoxidized boron atoms in two-dimensional boryl oxide decreases from 82.92% (temperature is 10°C) to 26.65% (temperature is 50°C). This shows that the preparation method of the present invention can effectively regulate the oxygen content of two-dimensional boryl oxide by controlling the temperature.

[0085] In addition, through SEM, UPS and TEM tests, it can be seen that with the increase of the temperature of ultrasonic treatment, the proportion of two-dimensional boryl oxide with transparent flake morphology increases from 5% (ultrasonic treatment temperature is 10℃) to 20% (ultrasonic treatment temperature is 20℃), and then increases to 96% (ultrasonic treatment temperature is 50℃), and the band gap gradually increases; the proportion of two-dimensional boryl oxide with β-rh. phase structure increases from 50% (ultrasonic treatment temperature is 10℃) to 67% (ultrasonic treatment temperature is 20℃) and then decreases to 45% (ultrasonic treatment temperature is 50℃), and the β-rh. phase structure is as follows Figure 4 As shown; the above indicates that the preparation method of the present invention can effectively regulate the morphology, band gap and surface configuration of two-dimensional boryl oxide by controlling the temperature.

[0086] Figure 5 is the XPS spectra of Examples 8, 10 to 13, wherein, Figure 5 A to E are the XPS spectra of two-dimensional borylene oxide obtained at different ultrasonic treatment powers (the upper left corner of the figure is the fitting area ratio of BB, BO and B2O3); Figure 5 The relationship between the atomic ratio of F to BB, BO and B2O3 and the power of different ultrasonic treatments. Figure 5 The fitting area ratios of BB, BO and B2O3 of A to E are calculated to show that when the ultrasonic treatment time is 12 h and the temperature is 40°C, the proportion of unoxidized boron atoms in the two-dimensional boryl oxide decreases from 64.62% (ultrasonic treatment power is 250 W) to 28.27% (ultrasonic treatment power is 850 W). This indicates that the preparation method of the present invention can effectively regulate the oxygen content of the two-dimensional boryl oxide by controlling the ultrasonic treatment power.

[0087] In addition, through SEM, UPS and TEM tests, it can be seen that with the increase of ultrasonic treatment power, the proportion of ribbon-like morphology products decreased from 95% (ultrasonic treatment power is 250W) to 4% (ultrasonic treatment power is 850W), the band gap gradually increased, and the proportion of two-dimensional boryl oxide in h-B2O phase structure decreased from 50% (ultrasonic treatment power is 250W) to 0% (ultrasonic treatment power is 850W). Figure 6 As shown; the above indicates that the preparation method of the present invention can effectively regulate its morphology, band gap and surface configuration by controlling the power of ultrasonic treatment.

[0088] Figure 7 The electron microscope pictures of the two-dimensional borylene oxide prepared in Examples 1, 4, 5 and 8 are shown in FIG. Figure 7 It can be seen that the morphology of the two-dimensional borophene oxide in Example 1 and Example 4 is mainly a band-like structure, while the morphology of the two-dimensional borophene oxide in Example 5 and Example 8 is mainly a sheet-like structure.

[0089] In addition, as the proportion of oxidized boron atoms increases from 16% to 30%, the density of the two-dimensional borophene oxide with a ribbon structure increases from 3 strips / μm to 2 Increased to 15 lines / μm 2 , and then gradually decreased to 1 line / μm 2 As the proportion of oxidized boron atoms increases from 40% to 73%, a flake structure gradually emerges, with a density of 1 flake / μm 2 Gradually increase to 9 pieces / μm 2 , and replaced the banded structure to become dominant.

[0090] The yields of the two-dimensional borylene oxide of Examples 1 to 13 were calculated, as shown in Table 4. The yield calculation formula of the two-dimensional borylene oxide is as follows:

[0091] Yield of two-dimensional borophene oxide=(mass of two-dimensional borophene oxide / mass of boron powder)×100%.

[0092] Table 4 Yields of two-dimensional borylene oxide in Examples 1 to 13

[0093] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Yield 31.11％ 30.00％ 35.21％ 32.12％ 33.15％ 34.18％ 34.00％ Example 8 Example 9 Example 10 Embodiment 11 Example 12 Example 13 Yield 33.78％ 34.89％ 34.34％ 34.75％ 32.87％ 34.55％

[0094] It can be seen from Table 4 that the yields of two-dimensional borophene oxide in the preparation methods of Examples 1 to 13 all reach more than 30%, indicating that the yield of two-dimensional borophene oxide prepared by the preparation method of the present invention is high, which is significantly higher than the yield (about 1%) of the current two-dimensional borophene oxide preparation methods, such as the improved Hummer's method and molecular beam epitaxy.

[0095] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. 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 claims of the present invention.

Claims

1. A method for preparing two-dimensional borophene oxide, characterized in that: The steps include: S1. dispersing boron powder in isopropanol to obtain a dispersion; S2. subjecting the dispersion to ultrasonic treatment and centrifugation to obtain the two-dimensional borylene oxide; The conditions of the ultrasonic treatment in step S2 are: temperature ≤ 60°C and power 200-1000W.

2. The preparation method according to claim 1, characterized in that: The mass volume ratio of the boron powder and isopropanol in step S1 is 1-2 mg:1 mL.

3. The preparation method according to claim 1, characterized in that: The boron powder in step S1 is at least one of amorphous boron powder and crystallized boron powder.

4. The preparation method according to claim 1, characterized in that: The temperature in step S2 is 10-50°C.

5. The preparation method according to claim 1, characterized in that: The ultrasonic treatment time in step S2 is 0.4 to 12 hours.

6. The preparation method according to claim 1, characterized in that: The power in step S2 is 250-850W.

7. The preparation method according to claim 1, characterized in that: The centrifugation in step S2 includes a first centrifugation and a second centrifugation performed successively; the conditions of the first centrifugation are: a speed of 1500-5000 rpm, a time of 10-50 min, and taking the supernatant; the conditions of the second centrifugation are: a speed of 10000-12000 rpm, a time of 5-10 min, and taking the precipitate.

8. The preparation method according to claim 1, characterized in that: After the centrifugation in step S2, the method further includes the steps of washing and removing the washing agent and isopropanol.

9. A two-dimensional borophene oxide, characterized in that: It is prepared by the preparation method according to any one of claims 1 to 8.

10. An application of the two-dimensional borophene oxide according to claim 9 in the fields of photoelectric detection, catalysis, gas sensing detection or energy storage.

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