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Preparation method of few-layer bismuth selenide nanosheets

A nano-sheet and a few-layer technology, applied in the field of bismuth selenide bulk materials, can solve the problems of cumbersome, unsuitable for mass production, large consumption, etc., and achieve the effect of good dispersibility

Inactive Publication Date: 2014-08-13
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the bottom-up synthesis technology, such as molecular beam epitaxy, requires the use of sophisticated equipment for synthesis, which is expensive and consumes a lot, and is not suitable for mass production; single-layer or few-layer Bi obtained from bottom-up 2 Se 3 In the method of nanosheets, such as the method of using lithium ion intercalation for exfoliation, it is relatively cumbersome and requires multi-step reactions, washing, impurity removal, etc.

Method used

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  • Preparation method of few-layer bismuth selenide nanosheets

Examples

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Effect test

Embodiment 1

[0025] Bi 2 Se 3 Preparation of solid materials: Weigh 0.9g polyvinylpyrrolidone with an electronic balance and dissolve it in a beaker containing 36mL of ethylene glycol. In addition, 1mmol of bismuth oxide, 3mmol of selenium powder and 4mmol of ethylenediaminetetraacetic acid are added to the above solution. Stir well to mix. Pour the mixed solution into a high-pressure reactor and seal it, then place it in a homogeneous reactor and raise the temperature to 200°C, and react at 200°C for 20 hours to make the reaction complete. The obtained mixed solution was processed by high-speed centrifugation, the supernatant was removed, washed twice with ultrapure water and absolute ethanol respectively, and finally dried in a vacuum oven at 60° C. for 96 hours.

[0026] Fabrication of few-layer bismuth selenide nanosheets using NMP: to synthesize Bi 2 Se 3 Powder as raw material, 50mg, finely ground Bi 2 Se 3 The powder was added into 50mL of NMP, and then the mixed system was ul...

Embodiment 2

[0036] Bi 2 Se 3 Preparation of solid materials: Weigh 0.9g polyvinylpyrrolidone with an electronic balance and dissolve it in a beaker containing 36ml ethylene glycol. In addition, 1mmol bismuth oxide, 3mmol selenium powder and 4mmol ethylenediaminetetraacetic acid are added to the above solution respectively. Stir well to mix. Pour the mixed solution into a high-pressure reactor and seal it, then place it in a homogeneous reactor and raise the temperature to 200°C, and react at 200°C for 20 hours to make the reaction complete. The obtained mixed solution was processed by high-speed centrifugation, the supernatant was removed, washed twice with ultrapure water and absolute ethanol respectively, and finally dried in a vacuum oven at 60° C. for 96 hours.

[0037] Few-layer bismuth selenide nanosheets using CS-HAc: to synthesize Bi 2 Se 3 Powder as raw material, 50mg, finely ground Bi 2 Se 3 The powder was added to 50 mL of acetic acid aqueous solution with a chitosan conc...

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Abstract

The invention discloses a preparation method of few-layer bismuth selenide nanosheets, which relates to a bismuth selenide material. The preparation method comprises the following steps: putting selenium powder, bismuth oxide, polyvinylpyrrolidone, ethylene glycol and ethylenediamine tetraacetic acid into a reaction kettle to carry out a hydrothermal synthesis reaction, centrifugalizing obtained mixed liquid, removing liquid supernatant, and washing the obtained product respectively by using ultrapure water and anhydrous ethanol, and drying to obtain Bi2Se3 powder; and adding the Bi2Se3 powder into a N-methyl pyrrolidinone solvent or an acetic acid solution in which chitosan is dissolved, carrying out ultrasonic processing to obtain dispersion liquid of few-layer bismuth selenide nanosheets, standing the dispersion liquid, taking upper two thirds of the dispersion liquid and putting the taken dispersion liquid into a centrifuge to carry out low-speed centrifugalizing, collecting supernatant liquor obtained by centrifugalizing, and putting the supernatant liquor into a centrifuge to carry out high-speed centrifugalizing, removing a supernatant liquor part, and re-dispersing the obtained lower substance by using NMP (N-methyl pyrrolidinone) or an acetic acid solution, so that the few-layer bismuth selenide nanosheets dispersed in the solution are obtained finally. The preparation method is simple and quick.

Description

technical field [0001] The invention relates to a bismuth selenide body material, in particular to a preparation method of a few-layer bismuth selenide nanosheet. Background technique [0002] Topological insulators are a type of bulk-phase insulating, but a new type of quantum matter that exhibits a special metallic state on the surface. It is setting off a wave of research in the fields of condensed matter physics, chemistry, and materials. Its properties are mainly due to the coupling of its spin-orbit interaction and time-reversal symmetry (Nature, 2010, 464:194-198; Nature Chemistry, 2011, 3: 845-849). Among them, bismuth selenide (Bi 2 Se 3 ) exhibits topological insulator properties that make it a material with good application prospects (Nature, 2009, 460:1101-1105). Currently, few-layer or single-layer Bi 2 Se 3 Nanosheets are mainly synthesized from the atomic or molecular scale through chemical reactions in a bottom-up manner (Journal of the American Chemical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04B82Y40/00
Inventor 翁建孙莉萍林智钦彭健
Owner XIAMEN UNIV
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