Preparation of graphene/nano-Ag composite, microstructure and electrical property
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摘要: 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50 wt%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16 wt%的RGO/Ag片方阻值可达到8 mΩ/□ ;当GO加入量高于50 wt%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。Abstract: 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%.
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Key words:
- graphene /
- graphene oxide /
- nano-Ag /
- composites /
- electrical property
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