Low-heat solid-phase chemical method for preparing Bi2O2Se nanosheet
The preparation of Bi2O2Se nanosheets at room temperature by low-thermal solid phase chemistry method solves the problems of complex synthesis methods and expensive equipment in the prior art, and realizes efficient and environmentally friendly nanosheet preparation, which is suitable for large-scale production.
Patent Information
- Application Number
- CN202510722519.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-30
- Publication Date
- 2025-08-01
AI Technical Summary
The prior art is difficult to efficiently synthesize high-quality two-dimensional Bi2O2Se nanosheets, and the synthesis method is complex, the equipment is expensive or the output is low, which limits its large-scale application.
Using low-thermal solid phase chemistry, bismuth nitrate pentahydrate, sodium hydroxide and selenium sources were ground and mixed at room temperature, and then yellow products were generated and reacted in a water bath to prepare Bi2O2Se nanosheets, avoiding the use of solvents, and the reaction yield was as high as 90%.
It realizes efficient preparation of Bi2O2Se nanosheets under low temperature conditions, with high reaction yield, simple operation and environmental protection, and is suitable for large-scale production.
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Abstract
Description
Technical Field
[0001] The present invention relates to a low-temperature solid-phase chemical method for preparing Bi2O2Se nanosheets. Background Art
[0002] Layered bismuth oxychalcogenides (Bi2O2X, including Bi2O2S, Bi2O2Se, Bi2O2Te) as thermoelectric materials have remarkable stability, tunable band structures, and high carrier mobilities. Among them, Bi2O2S has a stable layered structure, ultra-high carrier mobility, and a medium bandgap, and has played an important role in fields such as photoelectric detection, thermoelectric devices, photovoltaic devices, artificial synapses, optical switches, and biomedicine. Bi2O2Se is an ionic layered material, in which the n 2n+ -[Se] n 2n− interaction between layers is a weak electrostatic interaction force rather than a weak van der Waals force between layers, showing excellent physical properties such as good mechanical flexibility and broadband optical response. However, the synthesis of high-quality two-dimensional Bi2O2Se nanomaterials severely depends on limited substrates and expensive equipment, thus restricting their large-scale industrial applications.
[0003] Currently, the synthesis methods of two-dimensional Bi2O2Se nanosheets include liquid-phase exfoliation method, chemical vapor deposition method (CVD), solution method, molecular beam epitaxy method (MBE), etc. However, the precise control of thickness and domain size in the mechanical exfoliation method still needs to be further explored; the CVD method usually has low yield and involves complex operation processes and sophisticated instrument equipment; the solution method usually has the advantages of simple operation, mild reaction, and low cost, but the obtained nanosheet size is small, and at the same time, aggregation and non-uniformity occur; these methods all face problems such as complex operation processes and harsh growth conditions. Therefore, there is an urgent need to develop a new strategy that can partially replace the above methods to make up for the limitations of the existing technology, so as to obtain Bi2O2Se nanocrystals suitable for specific application scenarios.
[0004] The present invention discloses a low-temperature solid-phase chemical method for synthesizing Bi2O2Se nanosheets. The reactants are respectively ground into fine powders, and then they are mixed evenly and ground continuously. Grinding can continuously increase new contact interfaces and accelerate the reaction rate. The Bi2O2Se nanomaterials are prepared by the chemical reaction occurring through the mutual contact of solid reactants. Compared with other synthesis methods, the low-temperature solid-phase chemical method occurs under the condition of lower than 100 o °C, there is no chemical equilibrium, the reaction yield is greater than 90%, and no solvent is used in the reaction, having the advantages of being green, energy-saving, and pollution-free, and will become a simple preparation method for Bi2O2Se nanomaterials. Summary of the Invention
[0005] The object of the present invention is to provide a low-temperature solid-phase chemical method for synthesizing Bi2O2Se nanosheets. This method uses cheap and easily available reactants and a simple operation method to synthesize flaky Bi2O2Se nanomaterials through chemical reactions between solid reactants at room temperature.
[0006] A low-temperature solid-phase chemical method for synthesizing Bi2O2Se nanosheets is carried out according to the following steps:
[0007] First, bismuth nitrate pentahydrate and sodium hydroxide are put into a mortar and ground. A yellow product is formed by the reaction. Then, a selenium source is added and the mixture is further mixed evenly. After grinding at room temperature for half an hour, the sample is sealed in a conical flask, and the conical flask is placed in a water bath for further reaction. Finally, it is filtered and washed with distilled water and dried at room temperature to obtain flaky Bi2O2Se nanomaterials.
[0008] In summary, the low-temperature solid-phase reaction method for synthesizing Bi2O2Se nanomaterials proposed by the present invention is not only a relatively simple synthesis scheme at present, but also has certain discussions on the ratio of synthetic raw materials, which provides certain inspiration for the synthesis of ternary metal oxysulfides in the future. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 It is the X-ray diffraction pattern of Bi2O2Se prepared in the implementation of the present invention;
[0010] Figure 2 It is the field emission scanning electron microscope photograph of Bi2O2Se prepared in the implementation of the present invention. DETAILED DESCRIPTION OF THE INVENTION
[0011] The present invention will be further described below in conjunction with specific embodiments. These embodiments should be understood as only for illustrating the present invention and not for limiting the protection scope of the present invention. After reading the content recorded in the present invention, various changes or modifications made to the present invention based on the principle of the present invention also fall within the scope defined by the claims of the present invention.
[0012] A preparation method of flaky Bi2O2Se nanomaterials includes the following specific steps: <\
[0013] Accurately measure 0.97 g of bismuth nitrate pentahydrate and 0.8 g of sodium hydroxide, grind them into fine powders respectively and then quickly mix and grind until the mixture turns yellow. Then add 0.1184 g of selenium powder, continue to grind for 30 minutes, seal the mixture in a conical flask, and then place the conical flask in an 80 o °C water bath for reaction for 12 h. Finally, it is filtered and washed with distilled water and dried at room temperature to obtain the product.
Claims
1. The present invention discloses a low-temperature solid-state chemical method for preparing Bi2O2Se nanosheets, which comprises the following steps: Accurately weigh 0.97 g of bismuth nitrate pentahydrate and 0.8 g of sodium hydroxide, grind them into fine powders respectively, then quickly mix and grind them until the mixture turns yellow. Then add 0.1184 g of selenium powder, continue grinding for 30 minutes, seal the mixture in a conical flask, and then place the conical flask in an 80 o °C water bath and react for 12 h. Finally, filter and wash with distilled water, and finally obtain flaky Bi2O2Se nanomaterials after drying at room temperature.