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Low dimensional nano-silver/Bi2Te3 based thermoelectric composite material and preparation method thereof

A low-dimensional nanometer and composite material technology, which is applied in the field of low-dimensional nanometer silver/Bi2Te3 based thermoelectric composite materials and its preparation, can solve the problems of reducing the electrical conductivity of the composite material, reducing the lattice thermal conductivity, etc., so as to improve the production process, The effect of reducing lattice thermal conductivity and simple preparation method

Active Publication Date: 2013-12-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, while the nanoparticles enhance phonon scattering and reduce the thermal conductivity of the lattice, the carriers are also scattered to a certain extent, thereby reducing the electrical conductivity of the composite.

Method used

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  • Low dimensional nano-silver/Bi2Te3 based thermoelectric composite material and preparation method thereof
  • Low dimensional nano-silver/Bi2Te3 based thermoelectric composite material and preparation method thereof
  • Low dimensional nano-silver/Bi2Te3 based thermoelectric composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] n-type Bi 2 Te 3 Matrix Nanopowder

[0048] Using bismuth chloride and high-purity tellurium powder as raw materials, according to Bi 2 Te 3 Weigh 2mmol bismuth chloride and 3mmol tellurium powder, then add 0.8g disodium ethylenediaminetetraacetic acid, 0.5g sodium hydroxide, 0.15g sodium borohydride, 50ml deionized water in sequence, stir evenly, and ultrasonically Treat for 60 minutes, then transfer the mixed solution to a 100ml polytetrafluoroethylene-lined reactor, add deionization to 80% of the reactor volume, and seal it. The reactor was heated in an oven at 200°C for 8h. After the reaction was complete, the reaction kettle was cooled to room temperature, and the synthesized black powder was suction-filtered, washed repeatedly with deionized water and absolute ethanol for 3 times, and dried under vacuum at 60°C for 6 hours to obtain n-type Bi 2 Te 3 Matrix nanopowder.

[0049] SPS sintering was performed under an Ar atmosphere using a graphite mold. The s...

Embodiment 2

[0051] n-type Bi 2 Te 3 Matrix nanopowder+0.5vol% silver nanowire

[0052] Using bismuth chloride and high-purity tellurium powder as raw materials, according to Bi 2 Te 3 Weigh 2mmol bismuth chloride and 3mmol tellurium powder, then add 0.8g disodium ethylenediaminetetraacetic acid, 0.5g sodium hydroxide, 0.15g sodium borohydride, 50ml deionized water in sequence, stir evenly, and ultrasonically Treat for 60 minutes, then transfer the mixed solution to a 100ml polytetrafluoroethylene-lined reactor, add deionization to 80% of the reactor volume, and seal it. The reactor was heated in an oven at 200°C for 8h. After the reaction was complete, the reaction kettle was cooled to room temperature, and the synthesized black powder was suction-filtered, washed with deionized water and absolute ethanol for 3 times, and dried under vacuum at 60°C for 6 hours to obtain n-type Bi 2 Te 3 Matrix nanopowder.

[0053] Dissolve polyvinylpyrrolidone and silver nitrate in ethylene glycol ...

Embodiment 3

[0057] n-type Bi 2 Te 3 Matrix nanopowder + 1.0vol% silver nanowire

[0058] Using bismuth chloride and high-purity tellurium powder as raw materials, according to Bi 2 Te 3 Weigh 2mmol bismuth chloride and 3mmol tellurium powder, then add 0.8g disodium ethylenediaminetetraacetic acid, 0.5g sodium hydroxide, 0.15g sodium borohydride, 50ml deionized water in sequence, stir evenly, and ultrasonically Treat for 60 minutes, then transfer the mixed solution to a 100ml polytetrafluoroethylene-lined reactor, add deionization to 80% of the reactor volume, and seal it. The reactor was heated in an oven at 200°C for 8h. After the reaction was complete, the reaction kettle was cooled to room temperature, and the synthesized black powder was suction-filtered, washed with deionized water and absolute ethanol for 3 times, and dried under vacuum at 60°C for 6 hours to obtain n-type Bi 2 Te 3 Matrix nanopowder.

[0059] Dissolve polyvinylpyrrolidone and silver nitrate in ethylene glyco...

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Abstract

The invention relates to a low dimensional nano-silver / Bi2Te3 based thermoelectric composite material and a preparation method thereof. The thermoelectric composite material is composed of two phases, wherein the first phase is nanometer Bi2Te3, the second phase is low dimensional nano-silver, and the nano-silver accounts for 0.5-2.5% in volume percentage in the thermoelectric composite material. The preparation method comprises the steps of compounding the nanometer Bi2Te3 and the nano-silver respectively, carrying out ultrasonic mixing according to different volume ratios, and lastly obtaining the low dimensional nano-silver / Bi2Te3 based thermoelectric composite material by carrying out sintering through an SPS technology. Compared with a bismuth telluride based thermoelectric material, under the condition that the conductivity of the matrix thermoelectric material is maintained to be basically unchanged, the low dimensional nano-silver / Bi2Te3 based thermoelectric composite material can obviously reduce the crystal heat conductivity of the material and improve the Seebeck coefficient of the material, and thus the thermoelectric prosperities of the material can be improved to a large extent.

Description

technical field [0001] The invention belongs to the field of thermoelectric composite materials and their preparation, in particular to a low-dimensional nano-silver / Bi 2 Te 3 Based thermoelectric composite material and its preparation method. Background technique [0002] Thermoelectric materials are a class of functional materials that directly couple and convert thermal energy and electrical energy through the Seebeck effect and Peltier effect of semiconductor materials. Because of its own advantages such as no pollution, no noise, small size, long life and high reliability, it is widely used in cogeneration, aerospace, military equipment, household appliances and other fields. [0003] The performance of thermoelectric materials mainly depends on the material's dimensionless thermoelectric figure of merit ZT (ZT=α 2 σT / κ, where α is the Seebeck coefficient, σ is the electrical conductivity, κ is the thermal conductivity, and T is the absolute temperature). The larger...

Claims

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Application Information

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IPC IPC(8): H01L35/16
Inventor 王连军张骐昊王明辉朱娟娟江莞
Owner DONGHUA UNIV