Bi2Te3 thin-piece/graphene composite material, preparation method and applications thereof

A composite material and graphene technology, applied in the direction of graphene, binary selenium/tellurium compounds, thermoelectric device junction lead-out materials, etc., can solve the problems of weakening phonon scattering mechanism, easy agglomeration of fine grains, sintering, etc. Achieve the effect of low cost, improved thermoelectric performance, and uniform distribution

Inactive Publication Date: 2012-10-31
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, fine grains are easy to agglomerate and sinter during heat treatment, thus weakening the scattering mechanism for phonons

Method used

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  • Bi2Te3 thin-piece/graphene composite material, preparation method and applications thereof
  • Bi2Te3 thin-piece/graphene composite material, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) The analytically pure BiCl 3 and Te powder, according to the ratio of Bi:Te atomic ratio of 2:3 and mixed in absolute ethanol to obtain Bi 2 Te 3 The meter concentration is the mixed solution of 0.015mol / L, and the mixed solution volume is 80 milliliters.

[0034] 2) Add 48 mg of GO to the mixture in step 1) and fully ultrasonically disperse it, then place it in a high-pressure reactor with a capacity of 100 ml (filling degree 80%, volume percentage), and then add 1.2 g of reducing agent NaBH to the solution 4 , and then add 6M NaOH aqueous solution to adjust the pH value to 10, and then seal it immediately.

[0035] 3) Heating the reactor to 180°C and reacting for 24 hours.

[0036] 4) Naturally cool to room temperature after the reaction, collect the powdery reaction product at the bottom of the kettle, wash it with deionized water and absolute ethanol alternately and repeatedly for several times, then vacuum dry the powder at 110°C for 12 hours to obtain a comp...

Embodiment 2

[0039] 1) Analytical pure Bi(NO 3 ) 3 ·5H 2 O and Na 2 TeO 3 , according to the ratio of Bi:Te atomic ratio of 2:3 and mixed in deionized water to obtain Bi 2 Te 3 The meter concentration is the mixed solution of 0.03mol / L, and the mixed solution volume is 80 milliliters.

[0040] 2) Add 58 mg of GO to the mixture in step 1) and fully ultrasonically disperse it, then place it in a high-pressure reactor with a capacity of 100 ml (filling degree 80%, volume percentage), and add 3.2 g of reducing agent KBH to the solution 4 , and then add 6M KOH aqueous solution to adjust the pH value to 11, and then seal it immediately.

[0041] 3) Heating the reactor to 160°C and reacting for 48 hours.

[0042] 4) Naturally cool to room temperature after the reaction, collect the powdery reaction product at the bottom of the kettle, wash it with deionized water and absolute ethanol alternately and repeatedly for several times, then vacuum dry the powder at 110°C for 12 hours to obtain a ...

Embodiment 3

[0045] 1) will analyze pure BiF 3 and K 2 TeO 3 Bi 2 Te 3 The meter concentration is the mixed solution of 0.09mol / L, and the mixed solution volume is 80 milliliters.

[0046] 2) Add 57 mg of GO to the mixture in step 1) and fully ultrasonically disperse it, then place it in a high-pressure reactor with a capacity of 100 ml (filling degree 80%, volume percentage), and add 6.9 g of reducing agent NaBH to the solution 4 , then add 6M NaOH aqueous solution to adjust the pH value to 11 and seal immediately.

[0047] 3) Heating the reactor to 200°C and reacting for 36 hours.

[0048] 4) Naturally cool to room temperature after the reaction, collect the powdery reaction product at the bottom of the kettle, wash it with deionized water and absolute ethanol alternately and repeatedly for several times, then vacuum dry the powder at 110°C for 12 hours to obtain a composite material powder 5.8 grams, the weight percentage of graphene in the composite material is 0.4%.

[0049] Th...

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Abstract

The invention discloses a Bi2Te3 thin-piece / graphene composite material. The Bi2Te3 thin-piece / graphene composite material consists of a micron-sized Bi2Te3 thin sheet and graphene. Due to the actions of dispersion, bearing and isolation of the graphene, the sintering of the micron-sized Bi2Te3 thin sheet in the heat-treatment process can be effectively prevented for maintaining effective scattering of the crystal boundary to phonons, and the great significance for improving the thermoelectric properties of the Bi2Te3 material is embodied. The composite material can be used as a thermoelectric material. The invention also discloses a preparation method of the composite material by a one-step hydrothermal method or a one-step solvothermal method, and has the advantages of simple process, low cost, short period and low energy consumption and the like.

Description

technical field [0001] The invention relates to the field of composite materials for thermoelectricity, in particular to a Bi 2 Te 3 Flake / graphene composite material and its preparation method and application. Background technique [0002] A thermoelectric material is a semiconductor material that directly converts electrical energy and thermal energy through the movement of carriers (electrons or holes). When there is a temperature difference between the two ends of the thermoelectric material, the thermoelectric material can convert heat energy into electrical energy output; or conversely, when a current is passed through the thermoelectric material, the thermoelectric material can convert electrical energy into heat energy, absorbing heat at one end and releasing heat at the other end. Thermoelectric materials have broad application prospects in the fields of power generation or refrigeration. Thermoelectric power generation devices using thermoelectric materials can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/16C01B31/04C01B19/04C01B32/184
Inventor 谢健屠芳芳刘双宇朱铁军曹高劭赵新兵
Owner ZHEJIANG UNIV
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