Sandwich copper nanoparticle @ graphene oxide composites: High-Temperature stability and long-term stable conductivity

To prevent CuNPs oxidation, we studied their interaction between graphene oxide (GO) sheets, forming CuNPs@GO composites via a liquid-phase reduction method, and resulting sandwich structures. The limited GO interlayer distance controls the size of CuNPs (similar to 10 nm diameter) during the reduction process. The large surface area of GO sheets provide enough space for CuNPs against their aggregation. To confirm the sandwich structure can protect CuNPs from oxidation, the air stability and high-temperature stability of CuNPs@GO composites were evaluated. The result shows that the composites exhibit no oxidation sign following exposure to dry air for at least 21 weeks or 90 degrees C. Simultaneously, the synthesized composites show long-term stable conductivity. This sandwich structure composites provide a potential research direction for fabricating CuNPs with high antioxidant stability and long-term stable conductivity.

Automated summary

By studying the interaction between CuNPs and graphene oxide, CuNPs@GO composites with sandwich structures were formed to prevent CuNPs oxidation and maintain long-term stable conductivity.