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A preparation method for optimizing the thermoelectric performance of silver selenide/nylon flexible composite film

A composite thin film and thermoelectric performance technology, which is applied in the manufacture/processing of thermoelectric devices, thermoelectric device components, thermoelectric device junction lead-out materials, etc., can solve the problem that the carrier concentration of the film is not optimized and the thermoelectric performance is selenized Silver gap, low power factor and other issues, to achieve the effect of low-cost preparation process, simple and easy preparation process, and excellent flexibility

Active Publication Date: 2021-07-16
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the thermoelectric performance of this thin film is still far from that of the existing high-performance bulk AgSe, mainly due to three aspects: (1) The sintering of uniform nanowires is challenging, resulting in the hot-pressed thin film being Porous structure, low density (relative density 70%); (2) The silver selenide grains of the film have an obvious preferred orientation in the (00l) direction, and the first-principle calculations show that in (00l), (0l0 ), (100) in the three directions, the silver selenide grains in the (00l) direction have the lowest power factor; (3) The carrier concentration of the film is not optimized

Method used

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  • A preparation method for optimizing the thermoelectric performance of silver selenide/nylon flexible composite film
  • A preparation method for optimizing the thermoelectric performance of silver selenide/nylon flexible composite film
  • A preparation method for optimizing the thermoelectric performance of silver selenide/nylon flexible composite film

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Embodiment 1

[0036] A preparation of high thermoelectric performance silver selenide (Ag 2 Se) / nylon flexible composite film method, the method will 20ml selenium nanowire (Se) ethylene glycol (EG) dispersion (45mmol / L), 0.6g silver nitrate (AgNO 3 ) and 80ml of ethylene glycol were added to the beaker, stirred at 40°C for 2 hours, centrifuged at a speed of 4000r / min, and the black precipitate was extracted, then deionized water and absolute ethanol were added alternately and washed by centrifugation at a speed of 4000r / min for 3 minutes To remove impurities, after the centrifugation, the carefully cleaned black target product was dispersed in 15ml of absolute ethanol for ultrasonic dispersion for 15min, and then the nylon filter was used as a substrate to obtain a silver selenide / nylon flexible membrane by vacuum filtration. The film was dried in a vacuum oven at 60 °C for 12 h. After the film is taken out, it is hot-pressed at 200°C and 1MPa for 30 minutes, and the power factor can be o...

Embodiment 2

[0047] A method for preparing silver selenide / nylon flexible composite film with high thermoelectric performance, the method is ethylene glycol (EG) dispersion (45mmol / L) of 20ml selenium nanowire (Se), silver nitrate (AgNO 3 , the amount added meets the molar ratio of silver nitrate and selenium nanowires is 2:1) and 80ml of ethylene glycol were added to the beaker, stirred at 40°C for 1.5h, centrifuged at a speed of 4000r / min, and the resulting black precipitate was extracted, and the Alternately add deionized water and absolute ethanol, and centrifuge at a speed of 4000r / min for 3 minutes to remove impurities. After centrifugation, disperse the carefully cleaned black target product in 15ml of absolute ethanol for 15 minutes and ultrasonically disperse it with a nylon filter membrane. The substrate was vacuum filtered to obtain a silver selenide / nylon flexible film, and the obtained film was dried in a vacuum drying oven at a temperature of 60° C. for 12 hours. After the me...

Embodiment 3

[0049] A method for preparing silver selenide / nylon flexible composite film with high thermoelectric performance, the method is with the ethylene glycol (EG) dispersion (10mmol / L) of 20ml selenium nanowire (Se), silver nitrate (AgNO 3 , the amount added meets the molar ratio of silver nitrate and selenium nanowires is 4:1) and 80ml of ethylene glycol were added to the beaker, stirred at 40°C for 2.5h, centrifuged at a speed of 4000r / min, and the resulting black precipitate was extracted, and the Alternately add deionized water and absolute ethanol, and centrifuge at 4000r / min for 5min to remove impurities. After centrifugation, disperse the carefully cleaned black target product in 15ml of absolute ethanol for 15min and ultrasonically disperse it with a pore size of 0.22μm. The nylon filter membrane was used as the substrate, and the silver selenide / nylon flexible membrane was obtained by vacuum filtration, and the obtained membrane was dried in a vacuum drying oven at a temper...

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Abstract

The invention relates to a preparation method for optimizing the thermoelectric performance of silver selenide / nylon flexible composite film, comprising the following steps: (1) using selenium nanowires as templates, reacting with silver nitrate in ethylene glycol solvent at 40°C, and separating , to obtain the silver selenide nanostructure; (2) disperse the silver selenide nanostructure in absolute ethanol again, take the nylon filter membrane as the base, suction filter, and obtain the nylon-silver selenide thin film after drying; (3) finally, The nylon-silver selenide film obtained in step (2) is subjected to hot-pressing treatment to obtain the target product. Compared with the prior art, the method of the invention can prepare a high-performance flexible thermoelectric thin film, and use the thin film to manufacture a high-output performance thermoelectric device for powering wearable electronic devices.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric material preparation, and relates to a preparation method for optimizing the thermoelectric performance of silver selenide / nylon flexible composite film. Background technique [0002] Thermoelectric materials are a class of functional materials that can directly convert thermal energy to electrical energy. Thermoelectric power generation and refrigeration devices prepared by thermoelectric materials have the advantages of simple structure, small size, no moving parts, no wear, no noise, no pollution, etc. As an environmentally friendly material, thermoelectric materials have broad application prospects. [0003] The performance index of thermoelectric materials is generally measured by the dimensionless figure of merit ZT, and its expression is as follows: [0004] ZT = α 2 σT / κ where: [0005] α is the Seebeck coefficient; σ is the electrical conductivity; κ is the thermal conductivity...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L35/34H01L35/16H01L35/02
CPCH10N10/80H10N10/852H10N10/01
Inventor 蔡克峰蒋聪丁宇飞童亮
Owner TONGJI UNIV
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