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 (~ 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 °C heat. 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.

为了防止CuNPs氧化，我们研究了它们之间的相互作用，通过液相还原法形成CuNPs @ GO复合材料，并形成三明治结构。在还原过程中，有限的GO层间距离控制了CuNPs的大小（直径约10 nm）。GO板的大表面积为CuNP提供了足够的空间来防止其聚集。为了确认三明治结构可以保护CuNPs免受氧化，评估了CuNPs @ GO复合材料的空气稳定性和高温稳定性。结果表明，在暴露于干燥空气中至少21周或90°C后，复合材料无氧化迹象热。同时，合成的复合材料显示出长期稳定的导电性。这种三明治结构的复合材料为制备具有高抗氧化稳定性和长期稳定电导率的CuNPs提供了潜在的研究方向。