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Bismuth selenide-based organic intercalation thermoelectric material and preparation method thereof

A thermoelectric material, bismuth selenide-based technology, applied in the direction of thermoelectric device node lead-out material, thermoelectric device manufacturing/processing, etc., can solve the problems of application range limitation, achieve wide application range, increase thermoelectric value, thermal conductivity rate drop effect

Inactive Publication Date: 2019-08-30
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional bulk thermoelectric devices adopt a sandwich structure in the form of "substrate-thermocouple pair-substrate", which is generally suitable for relatively flat surfaces, and the application range is greatly limited.

Method used

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  • Bismuth selenide-based organic intercalation thermoelectric material and preparation method thereof
  • Bismuth selenide-based organic intercalation thermoelectric material and preparation method thereof
  • Bismuth selenide-based organic intercalation thermoelectric material and preparation method thereof

Examples

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preparation example Construction

[0016] The preparation of the bismuth selenide-based organic intercalation thermoelectric material includes the following steps:

[0017] 1) Immerse the 0.2-2mm×0.2-2mm×0.01-0.1mm bismuth selenide single crystal flakes in 1-3mol L -1 In the sample bottle of the n-butyl lithium solution, heat the sample bottle to 40°C and keep it soak for 24-48 hours;

[0018] 2) Transfer the product obtained in step 1) to a sample bottle filled with n-hexane solution, heat the sample bottle to 40°C, and soak for 30 minutes in heat preservation;

[0019] 3) Take out the product obtained in step 2), soak and wash 3-5 times according to the process of step 2);

[0020] 4) Transfer the product obtained in step 3) to 0.1-1molL -1 In the sample bottle of sodium nitrate dimethyl sulfoxide solution, heat the sample bottle to 40°C, and soak in the temperature for 0.5-4 hours;

[0021] 5) Transfer the product obtained in step 4) to 0.1-3molL -1 Soak the sample bottle of the dimethyl sulfoxide solution of hexylami...

Embodiment 1

[0022] Example 1: Preparation of chemical composition as Bi 2 Se 3 HA 0.11 DMSO 0.06 The intercalation thermoelectric material:

[0023] 1) Immerse a 2mm×2mm×0.1mm bismuth selenide single crystal in a 1.6mol L -1 In the sample bottle of n-butyl lithium solution, heat the sample bottle to 40°C and keep it warm and soak for 24 hours;

[0024] 2) Transfer the obtained product to a sample bottle containing n-hexane solution, heat the sample bottle to 40°C, and keep it soaked for 30 minutes; cycle soaking and washing 3 times;

[0025] 3) Transfer the resulting product to 0.1mol L -1 In the sample bottle of dimethyl sulfoxide solution of sodium nitrate, heat the sample bottle to 40°C and soak in the heat preservation for 1 hour;

[0026] 4) Transfer the resulting product to 0.2mol L -1 Soak the sample bottle of the dimethyl sulfoxide solution of hexylamine hydrochloride for 2 hours at room temperature to obtain the bismuth selenide single crystal organic intercalation superlattice thermoelec...

Embodiment 2

[0027] Example 2: Preparation of the chemical composition as Bi 2 Se 3 HA 0.15 DMSO 0.10 The intercalation thermoelectric material:

[0028] 1) Immerse a 2mm×2mm×0.1mm bismuth selenide single crystal in a 1.6mol L -1 In the sample bottle of the n-butyl lithium solution, heat the sample bottle to 40°C, and soak for 36 hours;

[0029] 2) Transfer the obtained product to a sample bottle containing n-hexane solution, heat the sample bottle to 40°C, and keep it soaked for 30 minutes; cycle soaking and washing 3 times;

[0030] 3) Transfer the resulting product to 0.1mol L -1 In the sample bottle of sodium nitrate dimethyl sulfoxide solution, heat the sample bottle to 40°C and soak in the heat preservation for 2 hours;

[0031] 4) Transfer the resulting product to 0.2mol L -1 Soak in a sample bottle of dimethyl sulfoxide solution of hexylamine hydrochloride for 3 hours at room temperature to obtain a bismuth selenide single crystal organic intercalation superlattice thermoelectric material. ...

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Abstract

The invention discloses a bismuth selenide-based organic intercalation thermoelectric material belonging to the technical field of thermoelectric materials and a preparation method thereof. The structural formula of the material is Bi2Se3HAxDMSOy, wherein HA is n-hexylamine (C6H15N), DMSO is dimethyl sulfoxide (C2H6OS), 0.01<=x<=0.5, 0.01<=y<=0.5. According to the invention, the bismuth selenide organic intercalation thermoelectric material is obtained through lithium intercalation, sodium ion exchange and n-hexylamine ion exchange by taking bismuth selenide single crystal as a raw material. Organic molecules enlarge the space distance between five layers of atom primitive cells of bismuth selenide, thereby weakening the inter-layer bonding, and resulting in vibration mode softening. Meanwhile, a phonon confinement effect is introduced, thereby greatly reducing the thermal conductivity of lattices, and enabling the thermoelectric figure of merit of bismuth selenide to be improved by about 100%. Therefore, the bismuth selenide-based organic intercalation super-crystal thermoelectric material is a thermoelectric material good application prospects.

Description

Technical field [0001] The invention belongs to the technical field of thermoelectric energy conversion materials. In particular, it relates to a bismuth selenide-based organic intercalation thermoelectric material and a preparation method thereof. Background technique [0002] The energy issue is the primary issue of the 21st century. The rapid consumption of non-renewable energy and the safety risks of nuclear energy all force us to step up the research and development of new clean energy. Thermoelectric materials can use the transport of carriers in solids to realize the mutual conversion of thermal energy and electrical energy. They have the characteristics of small size, no noise, and zero pollution emissions, so they have extremely broad application prospects. Traditional bulk thermoelectric devices adopt a sandwich structure of "substrate-thermocouple pair-substrate" sandwich structure, which is generally suitable for relatively flat surfaces, and the application range is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/12H01L35/34H10N10/85H10N10/01
CPCH10N10/85H10N10/01
Inventor 万春磊宗鹏安潘伟
Owner TSINGHUA UNIV