石墨烯/纳米银复合材料的制备、微结构及其导电性能

将不同比例的氧化石墨烯(GO)和硝酸银混合,采用水合肼一步还原制备石墨烯/纳米银(RGO/Ag)复合材料。采用UV-vis、XRD、FTIR和SEM对RGO/Ag复合材料结构组成进行表征分析,并结合热流量和结构变化研究其构成和热处理工艺对导电性的影响。结果表明:Ag基本以类似球形与石墨烯(RGO)复合;RGO/Ag复合材料的导电性与其构成有很大关系,只有当GO加入量小于50wt%时,Ag含量的提高和热处理工艺的优化可以明显改善复合材料的导电性,其中,GO加入量为16wt%的RGO/Ag片方阻值可达到8mΩ/□;当GO加入量高于50wt%时,复合材料导电性与RGO接近,受Ag含量的提高和热处理工艺优化的影响较小。

Preparation of graphene/nano-Ag composite,microstructure and electrical property

The graphene/nano-Ag(RGO/Ag) composite was prepared by a simple one-step chemical method, in which the hydrazine hydrate was used as a reductant. The microstructure and the components of the RGO/Ag composite were characterized by UV-vis, XRD, FTIR, SEM. Through analyzing heat flow and structure change, the influence of material structure and heat treatment on electrical conductivity of RGO/Ag composite was investigated. The results indicate that similar spherical Ag can be successfully synthesised companying with the reduction of silver nitrate and thus the RGO/Ag composite is prepared. The conductivity of the RGO/Ag composite increases significantly through adjusting Ag addition and heat treatment, when the loading amount of GO is below 50 wt%. The sheet resistance of RGO/Ag composite can be reached to 8 mΩ/□, when the loading amount of GO is 16 wt%. However, Ag content and heat treatment have much less effect on the conductivity of the resulting composite, when the loading amount of GO is more than 50 wt%.