N-type flexible thermoelectric film and preparation method thereof
A thermoelectric thin film, flexible technology, applied in the manufacture/processing of thermoelectric devices, thermoelectric device parts, thermoelectric device junction lead wire materials, etc., can solve the problems of low air stability, poor thermoelectric performance, and less development and research. , to achieve the effect of increasing compactness, excellent thermoelectric properties, and improving electrical conductivity
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[0023] A method for preparing an n-type flexible thermoelectric film, comprising the following steps:
[0024] S1. Dissolving polyethyleneimine and perfluorosulfonic acid resin in a solvent, adding carbon nanotubes or graphene to the solvent and mixing evenly to obtain a mixed solution;
[0025] S2. Make the mixed solution obtained in step S1 form a film on the substrate and then dry it to obtain an n-type flexible thermoelectric thin film.
[0026] The polyethyleneimine was purchased from Shanghai Aladdin Reagent Company with a concentration of 99% and a density of 1.03 g / mL.
[0027] The perfluorosulfonic acid resin uses a Nafion solution with a concentration of 5 wt%.
[0028] Based on the above-mentioned preparation method, the embodiments and comparative examples of the present invention are proposed as follows:
Embodiment 1
[0036] S1. Dissolve 0.3 g of polyethyleneimine, 7.5 mL of Nafion solution and 0.9 g of single-walled carbon nanotubes in 992.2 mL of ethanol, and stir at room temperature for 12 hours to obtain a mixture with a polyethyleneimine concentration of 0.03 vol%. solution;
[0037] S2. Apply the mixed solution obtained in step S1 onto a polyethylene terephthalate plastic film by drop coating, dry it in an oven at 55°C, and then anneal at 130°C for 20 minutes to obtain The surface is even and flat, has good self-supporting performance, and can be bent repeatedly n-type flexible thermoelectric film.
Embodiment 2
[0039] S1. Dissolve 0.3 g of polyethyleneimine, 11.25 mL of Nafion solution and 0.9 g of single-walled carbon nanotubes in 988.45 mL of ethanol, and stir at room temperature for 12 hours to obtain a mixture with a polyethyleneimine concentration of 0.03 vol%. solution;
[0040] S2. Apply the mixed solution obtained in step S1 onto a polyethylene terephthalate plastic film by drop coating, dry it in an oven at 55°C, and then anneal at 130°C for 20 minutes to obtain The surface is even and flat, has good self-supporting performance, and can be bent repeatedly n-type flexible thermoelectric film.
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