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Preparation method of Bi2Te3/graphene composite thermoelectric material

A graphene composite and thermoelectric material technology, which is applied in the manufacture/processing of thermoelectric devices, thermoelectric device node lead-out materials, binary selenium/tellurium compounds, etc., to prevent a large number of stacking and agglomeration, high electrical conductivity, and improve dispersion performance Effect

Inactive Publication Date: 2019-02-05
YANCHENG TEACHERS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although graphene / Bi 2 Te 3 The thermoelectric properties of composite materials have been improved, but further improvements are still needed to meet actual needs

Method used

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  • Preparation method of Bi2Te3/graphene composite thermoelectric material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Add 200 mg of nano-graphene powder and 400 mg of sodium chlorate to 50 mL of concentrated sulfuric acid, and stir for 6 h in an ice bath.

[0026] (2) centrifugally cleaning the modified graphene, drying for use;

[0027] (3) 2 mmol Bi (NO 3 ) 3 Put the modified nano-graphene powder into 100 mL of distilled water and stir for 1 h.

[0028] (4) Add 3 mmol Na to the solution 2 TeO 3 , 10mmol NaBH 4 With 0.2g NaOH, the heating temperature is 60 ℃, and the time is 12h.

[0029] (5) The product was washed with water and ethanol, and dried under vacuum to obtain a black powder.

Embodiment 2

[0031] (1) Add 200 mg of nano-graphene powder and 800 mg of sodium chlorate to 50 mL of concentrated sulfuric acid, and stir for 3 h in an ice bath.

[0032] (2) centrifugally cleaning the modified graphene, drying for use;

[0033] (3) 2 mmol Bi (NO 3 ) 3 Put the modified nano-graphene powder into 100 mL of distilled water and stir for 1 h.

[0034] (4) Add 3 mmol Na to the solution 2 TeO 3 , 10mmol NaBH 4 With 0.2g NaOH, the heating temperature is 60 ℃, and the time is 12h.

[0035] (5) The product was washed with water and ethanol, and dried under vacuum to obtain a black powder.

Embodiment 3

[0037] (1) Add 200 mg of nano-graphene powder and 400 mg of sodium chlorate to 50 mL of concentrated sulfuric acid, and stir for 6 h in an ice bath.

[0038] (2) centrifugally cleaning the modified graphene, drying for use;

[0039](3) 2 mmol Bi (NO 3 ) 3 Put the modified nano-graphene powder into 100 mL of distilled water and stir for 4 h.

[0040] (4) Add 3 mmol Na to the solution 2 TeO 3 , 10mmol NaBH 4 With 0.2g NaOH, the heating temperature is 60 ℃, and the time is 12h.

[0041] (5) The product was washed with water and ethanol, and dried under vacuum to obtain a black powder.

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Abstract

The invention provides a preparation method of a Bi2Te3 / graphene composite thermoelectric material. The preparation method includes adding nano graphene powder and sodium chlorate into concentrated sulfuric acid, performing stirring under an ice-bath state, and modifying trace hydroxy and epoxy groups on the surface of the nano graphene; and adding a Te source, alkali and a reducing agent after aBi source and the nano graphene are uniformly stirred and mixed, and preparing a Bi2Te3 / graphene composite thermoelectric material by adopting a low temperature wet chemical method. Through the disclosed method, the nano graphene can prevent Bi2Te3 nucleation from growing into particles with larger sizes, so that phonon scattering interfaces can be increased, and the thermal conductivity of the material can be reduced; the high conductivity of the nano graphene can provide higher mobility ratio for the composite material; and the method is mild in reaction condition, simple in preparation, lowin cost and easy to perform industrial batch production.

Description

technical field [0001] The invention relates to the field of thermoelectric material preparation, in particular to a Bi 2 Te 3 Preparation method of graphene / graphene composite thermoelectric material. Background technique [0002] At present, the problem of energy shortage is becoming more and more serious, and thermoelectric materials, as a new type of energy material, can realize the direct conversion between thermal energy and electric energy, so they have received extensive attention. As one of the thermoelectric materials with the best performance near room temperature, bismuth telluride-based compounds have broad application prospects in aerospace, machining, bioengineering, microelectronics and biochips and other fields. However, the thermoelectric figure of merit of traditional bismuth telluride-based bulk materials has been hovering at a relatively low level. With the rise of nanotechnology, researchers have found that by reducing material dimensions and preparin...

Claims

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Application Information

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IPC IPC(8): H01L35/34H01L35/16C01B19/04
CPCC01B19/007H10N10/852H10N10/01
Inventor 苗中正吴帅张志海
Owner YANCHENG TEACHERS UNIV
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