Graphene oxide/molybdenum disulfide composite thermoelectric material and preparation method thereof

A technology of molybdenum disulfide and thermoelectric materials, applied in the direction of thermoelectric device junction lead-out materials, thermoelectric device manufacturing/processing, etc., can solve the problems of low Seebeck coefficient, no flexibility, narrow applicable temperature range, etc.

Active Publication Date: 2019-10-22
THE HONG KONG POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, composite thermoelectric materials based on reduced graphene are all bulk materials composed of conductive polymers or inorganic semiconductors and reduced graphene, which have not achieved effective matching of composite components, and still have low Seebeck coefficients. , the applicable temperature range is narrow, and there are disadvantages such as no flexibility

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  • Graphene oxide/molybdenum disulfide composite thermoelectric material and preparation method thereof
  • Graphene oxide/molybdenum disulfide composite thermoelectric material and preparation method thereof
  • Graphene oxide/molybdenum disulfide composite thermoelectric material and preparation method thereof

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preparation example Construction

[0032] The present invention also provides a method for preparing the above-mentioned graphene oxide / molybdenum disulfide composite thermoelectric material, comprising: S1) mixing graphene oxide and molybdenum disulfide nanosheets in water, and ultrasonicating to obtain a mixed system; S2) mixing the Coating the mixed system on the substrate to obtain a graphene oxide / molybdenum disulfide composite thermoelectric material film; or filtering the mixed system to obtain a graphene oxide / molybdenum disulfide composite thermoelectric material.

[0033] The present invention has no special limitation on the sources of all raw materials, which can be commercially available or self-made.

[0034] In the present invention, the graphene oxide aqueous solution is preferably mixed with the molybdenum disulfide nanosheet aqueous solution.

[0035] The solid content of the graphene oxide aqueous solution is preferably 10 to 20 mg / ml; the graphene oxide aqueous solution is preferably a graph...

Embodiment 1

[0045] Preparation of graphene oxide: under ice bath, add 5g of graphite powder with a size of 300 mesh to 130mL of concentrated sulfuric acid with a concentration greater than 98%, add 2.5g of sodium nitrate and stir evenly, then slowly add permanganate under mechanical stirring Potassium 15g, the temperature was raised to 30°C after the stirring time was continued for 2 hours, and the stirring was continued for 0.5 hours. Then slowly add 230ml of deionized water dropwise, and stir for 0.5 hours. Raise the temperature to 95°C, add 350ml of deionized water at a temperature of 100°C, and stir for 10 minutes. Add 5-2 mL of 30% H 2 o 2 , and stirred for 20 minutes. After the temperature is lowered to room temperature, the obtained yellow-brown solution is subjected to high-speed centrifugation to remove impurities such as residual metal salts, and after several times of centrifugation, a yellow-brown graphene oxide dispersion with a pH value of 5-7 is obtained, wherein The so...

Embodiment 2

[0047] Nanosheet MoS 2 Preparation: Take and add 1g of MoS with a size of 300-500 mesh 2 Place in a glass reactor with a rubber stopper, and then pass nitrogen into the reactor to remove the air in the reactor. While keeping the reactor airtight, slowly add 10 ml of n-butyllithium / n-hexane solution with a molar concentration of 1.6 mol / L. Li was obtained after 2 days of stirring at room temperature x MoS 2 intermediate; then place the reaction system in an ice bath for ultrasonication for 1 hour, and then slowly add 20ml of deionized water; the solution after the reaction is subjected to high-speed centrifugation to remove n-hexane and other impurities; finally, the reaction product is placed in In the dialysis bag, the required molybdenum disulfide nanosheet aqueous solution was obtained after dialysis with deionized water for 2 days, and the MoS2 in the final product 2 The solid content is 5-20%.

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Abstract

The invention provides a preparation method of a graphene oxide/molybdenum disulfide composite thermoelectric material, which comprises the steps of S1) mixing graphene oxide and molybdenum disulfidenanosheets in water, and performing ultrasonic treatment to obtain a mixed system; S2) coating the mixed system on a base material, drying at a low temperature to obtain the graphene oxide/molybdenumdisulfide composite thermoelectric material; or filtering the mixed system to obtain the graphene oxide/molybdenum disulfide composite thermoelectric material. Compared with the prior art, the molybdenum disulfide nanosheet layer is added into the graphene oxide nanosheet layer, the energy filtering effect in the obtained composite thermoelectric material can be improved, the electric conductivityof the composite material can be continuously maintained, the thermal conductivity can be continuously reduced, the Seebeck coefficient of the composite thermoelectric material is improved, and the ZT value of the composite thermoelectric material is greatly increased. In addition, the graphene oxide/molybdenum disulfide composite thermoelectric material obtained according to the invention has adjustable P-N thermoelectric characteristics.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric materials and devices, in particular to a graphene oxide / molybdenum disulfide composite thermoelectric material and a preparation method thereof. Background technique [0002] Thermoelectric materials are materials that can directly convert heat energy and electric energy. Thermoelectric power generation devices and refrigeration devices based on thermoelectric materials have the characteristics of compact equipment, no noise, no pollution during operation, and waste energy can be recycled. Used in military, medical , aerospace, microelectronics and even household appliances and other fields have broad application prospects. Among them, compared with commercial bulk thermoelectric materials, flexible thermoelectric materials have unique advantages such as bendability, low preparation cost, simple process, and wide application range. In recent years, they have attracted more and more attenti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/14H01L35/16H01L35/22H01L35/34
CPCH10N10/851H10N10/852H10N10/855H10N10/01
Inventor 曾炜陶肖明
Owner THE HONG KONG POLYTECHNIC UNIV
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