The invention provides a preparation method of a graphene

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. 本发明提供了一种氧化石墨烯/二硫化钼复合热电材料的制备方法，包括：S1)将氧化石墨烯、二硫化钼纳米片在水中混合，超声，得到混合体系；S2)将所述混合体系涂覆于基材上，低温干燥，得到氧化石墨烯/二硫化钼复合热电材料；或将所述混合体系过滤，得到氧化石墨烯/二硫化钼复合热电材料。与现有技术相比，本发明通过将硫化米纳米片层加入氧化石墨烯纳米片层中，可提高得到的复合热电材料中的能量过滤效应，不断可维持复合材料的导电率及降低导热率，而且提高了复合热电材料的Seebeck系数，进而使复合热电材料的ZT值大幅度增加；并且本发明得到的氧化石墨烯/二硫化钼复合热电材料具有可调的P‑N型热电特性。