将硝酸镍溶液与氧化石墨烯溶胶混合后冷冻干燥,然后通过真空热还原得到负载过渡金属催化剂的石墨烯粉末。以天然气为碳源,在1 000℃下采用化学气相沉积工艺,在石墨烯表面和边缘生长碳纳米管,碳纳米管将孤立的石墨烯片层结构有效地联接起来,组成空间互联网络结构,从而构建了电子、热能和载荷有效传输的通道。
Graphite oxide powder impregnated with an Ni ( NO3 ) 2 solution was freeze-dried, thermally-reduced at 300 ℃ and then chemical-vapor deposition at 1 000 ℃ was used to grow carbon nanotubes (CNTs) on graphene using methane as the carbon source. The morphology and electrical conductivities of the graphite oxide, reduced graphene and CNT-graphene hybrids were characterized. Results indicate that the density of CNTs on the graphene and the electrical conductivity of the hybrids increase with increasing Ni(NO3 )2 concentration in the solution. Isolated graphene lamellae were connected by CNTs, giving rise to a 3D conducting net- work that provided conducting channels for electron transport.