Method for preparing Bi2(SexTe[1-x])3 monocrystal nanosheets

A single crystal nano, organic solvent technology, applied in single crystal growth, single crystal growth, chemical instruments and methods, etc., can solve the problems of harsh experimental conditions, complicated operation process of preparation methods, etc. The effect of preventing volatilization

Inactive Publication Date: 2015-12-30
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In the prior art, its preparation method is complicated in operation or requires harsh experimental conditions
However, the solvothermal method uses diethylenetriamine as a solvent, bismuth chloride, tellurium, and selenium elemental powders as precursors, without any template synthesis components to adjust Bi 2 (Se x Te 1-x ) 3 Single crystal nanosheets have not been reported

Method used

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  • Method for preparing Bi2(SexTe[1-x])3 monocrystal nanosheets
  • Method for preparing Bi2(SexTe[1-x])3 monocrystal nanosheets
  • Method for preparing Bi2(SexTe[1-x])3 monocrystal nanosheets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 In an autoclave, add 1mmol tellurium (Te) powder, 0.5mmol selenium (Se) powder and 30mL organic solvent diethylenetriamine, stir for 20 minutes and then add 1mmol bismuth chloride (BiCl 3 ), continue to stir for 20 minutes, seal the reaction vessel and place it at 200° C. for 24 hours for solvothermal reaction, then wash the reaction product with deionized water and absolute ethanol, dry it in vacuum and collect the final product.

[0025] The scanning electron microscope image of the obtained product can clearly see the flake-like structure, such as figure 1 shown. The X-ray diffraction pattern analysis results show that the product phase is Bi 2 Te 2 Se, such as figure 2 shown. combine image 3 The transmission electron microscope image of the figure 1 It can be seen that the resulting product has a very thin thickness. It can be seen from energy dispersive spectroscopy that the product is a Bi, Te, Se ternary system and the atomic percentage of Bi:T...

Embodiment 2

[0026] Example 2 In the autoclave, add 1mmol Te powder and 0.5mmol Se powder and 40mL organic solvent diethylenetriamine, stir for 20 minutes and add 1mmol bismuth chloride (BiCl 3 ), continue to stir for 20 minutes, seal the reaction vessel and place it at 200° C. for 24 hours for solvothermal reaction, then wash the reaction product with deionized water and absolute ethanol, dry it in vacuum and collect the final product. After determination, the product is Bi 2 Sete 2 .

Embodiment 3

[0027] Example 3 In the autoclave, add 0.5mmol Te powder and 1mmol Se powder and 30mL organic solvent diethylenetriamine, stir for 30min and then add 1mmol BiCl 3 , continue stirring for 30 minutes, seal the reaction vessel and place it at 180° C. for 24 hours for solvothermal reaction, then wash the reaction product with deionized water and absolute ethanol, dry it in vacuum and collect the final product. After determination, the product is Bi 2 Se 1.7 Te 1.3 .

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Abstract

The invention discloses a method for preparing Bi2(SexTe[1-x])3 monocrystal nanosheets, which comprises the following steps: adding tellurium powder, selenium powder and an organic solvent into a high-pressure reaction kettle, stirring for 15-35 minutes, adding bismuth chloride, continuing stirring for 15-35 minutes, sealing the reaction kettle, keeping the temperature at 180-200 DEG C for 12-48 hours, carrying out solvothermal reaction, cleaning the reaction product with deionized water and anhydrous ethanol 1-3 times, carrying out vacuum drying, and collecting to obtain the end product Bi2(SexTe[1-x])3 monocrystal nanosheets. A solvothermal process is adopted, diethylenetriamine is used as the solvent, and the bismuth chloride, tellurium simple-substance powder and selenium simple-substance powder are used as precursors to synthesize the adjustable-component Bi2(SexTe[1-x])3 monocrystal nanosheets without the assistant of other surfactants; and the obtained Bi2(SexTe[1-x])3 monocrystal nanosheets have favorable crystallinity and dispersity. The preparation method is low in environmental pollution, simple in process and easy to operate and popularize, and has important research value and wide application prospects.

Description

technical field [0001] The invention relates to a method for preparing semiconductor nanomaterials, in particular to a method for directly preparing Bi by solvothermal method. 2 (Se x Te 1-x ) 3 The method for single crystal nano sheet belongs to the technical field of semiconductor nano material and its preparation. Background technique [0002] The five- and six-group binary and ternary compound semiconductor nanomaterials have broad application prospects due to their special nonlinear properties, fluorescence characteristics, quantum size effects and other important physical and chemical properties. They can be used as thermoelectric and photoelectric components in various of instruments and equipment. [0003] Thermoelectric material refrigeration is a new type of environmentally friendly refrigeration method. In China, thermoelectric materials are mainly used in small-scale refrigeration devices, such as low-power refrigeration in infrared detection, computers, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/46C30B7/10
Inventor 雷仁博郭靓简基康
Owner GUANGDONG UNIV OF TECH
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