以氧化石墨烯( Graphene oxide,GO)水溶胶作溶剂和表面活性剂,将不同质量分数的多壁碳纳米管(Multi-walled carbon nanotubes,MWCNTs),通过超声空化作用分散于其中得到稳定均质的多壁纳米管/氧化石墨烯(MWCNT-GO)悬浮液.采用微滤自组装法制备MWCNT-GO杂化薄膜,然后将其置于真空干燥箱中进行低温(200℃)热处理1h以脱除GO中的大部分含氧官能团,即得部分还原的多壁碳纳米管-还原石墨烯(MWCNTRGO)杂化薄膜.结果表明:MWCNT-GO杂化薄膜呈现均质层状的“三明治”式结构,MWCNTs与GO形成3D交联导电网络,通过控制MWCNTs的添加量和低温热处理,可实现氧化石墨烯导电性的恢复和有效调控.随着MWCNTs含量的增加,所得MWCNT-GO杂化薄膜的导电率增加.掺杂质量分数50％的MWCNTs所制MWCNT-GO-50杂化薄膜的导电率为1 120 S/m,经200℃热处理后,导电率高达5 380 S/m.%Graphene oxide (GO) aqueous colloids mixed with different amounts of multi-walled carbon nano-tubes (MWCNTs) were dispersed by ultrasonication to form a stable and homogeneous MWCNT-GO suspension. MWCNT-reduced graphene oxide (MWCNT-RGO) hybrid films were obtained by microfiltration, followed by heat treatment at 200 t for 1 h in a vacuum oven to remove most of oxygen-containing functional groups. Results show that the MWCNT-GO hybrid films exhibit a uniformly-layered " sandwich" structure, forming a 3D conductive network. The electrical conductivity of the MWCNT-RGO hybrid films can be tuned by the amount of MWCNTs present and heat treatment conditions. The electrical conductivities of the hybrid films before and after the heat treatment all increase with the MWCNT content. The heat treatment increases the electrical conductivity of the hybrid film with 50% MWCNTs from 1 120 to 5 380 S/m.
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