Graphene-based selective absorption film system and absorbing layer preparation method thereof

Abstract

The invention discloses a graphene-based selective absorption film system and an absorbing layer preparation method thereof. The preparation method of the graphene absorbing layer in the film system is mixed solution coating and comprises the steps that graphite power is subjected to oxidation stripping to obtain an oxidized graphene aqueous solution; the oxidized graphene aqueous solution is mixed with a lower surface tension solution to obtain a mixed solution; the mixed solution is coated to the surface of an infrared reflecting layer, so that an oxidized graphene absorbing layer is obtained; and the oxidized graphene absorbing layer is subjected to reduction treatment to obtain the graphene absorbing layer. The graphene absorbing layer has good refractive index and extinction coefficient, so that the excellent spectral selectivity of the graphene-based selective absorption film system is ensured, and the photo-thermal utilization efficiency of the selective absorption surface is improved. Meanwhile, the thickness of the graphene layer is changed to adjust an optical band gap of the film system, and the graphene-based selective absorption film system further has a solar energy utilization system which has stability for a long time at high temperature, is matched with the optical band gap and can be widely applied to low temperature to high temperature.

Description

technical field [0001] The invention belongs to the technical field of preparation of solar energy selective absorption film, specifically, the invention relates to a solar energy selective absorption film system using graphene-based material as the absorption layer, and a solution coating preparation method of the graphene absorption layer . Background technique [0002] As a high-efficiency solar photothermal conversion device, solar selective absorption film has high solar light absorption rate and low thermal radiation emissivity, and has mature and extensive commercial applications in the field of solar water heating. So far, many selective absorption film systems have been promoted to the consumer market, such as black chrome, AlNiOX, AlN / Al, etc. Most commercially available selective absorbing films with excellent performance have a solar absorptivity greater than 0.9, a thermal radiation emissivity of less than 0.05, and long-term stability under medium and low temp...

AI Technical Summary

Problems solved by technology

However, the research on the shaping and regulation of the subwavelength interference structure of carbon materials is still incomplete. So far, there are very few researches on the development of selective absorption films with carbon materials as the main body.

As a typical new carbon-based material, graphene material has multi-scale assembly and tunable performance. The preparation of selective absorption film system based on it is expected to solve the long-term use stability at high temperature, but the work in this area still needs to be developed.

Images