利用膨化石墨原位气相沉积制备多层石墨烯/碳纳米管复合粉体。以膨胀石墨为基体，以硝酸铁、碳酸铵等物质对其进行修饰，结合化学气相沉积工艺，原位制备出多层石墨烯/碳纳米管复合粉体材料；探讨不同的修饰液相对复合粉体比例，微观形貌及分散性的影响。利用扫描电镜对复合粉体进行表征。结果表明：多层石墨烯/碳纳米管复合粉体材料可批量制备；其中多层石墨烯为透明薄片，其厚度为10~30 nm；通过控制工艺参数，可以实现多层石墨烯的质量比为15%~50%；复合粉体中碳纳米管的分散性明显优于一般化学气相沉积方法制备的碳纳米管；加入质量分数5%复合粉体的聚对苯二甲酸丁二醇酯( PBT)的表面电阻显著降低。
Expanded graphite ( EG) was loaded with iron by impregnating with ammonium carbonate and ferric nitrate solution. Carbon nanotubes ( CNTs) were grown on the EG by iron-catalyzed chemical vapor deposition, using acetylene as a carbon source to form hybrids that were used as a conductive filler to produce conducting polybutylene terephthalate ( PBT) composites by an ex-trusion method. It is found that the CNTs are not entangled and are easy to disperse. The CNT average diameters are 40, 20 and 40 nm, and their lengths are 2, 3. 7 and 2. 6μm for iron loadings of 1. 13, 0. 75 and 0. 57 mass%, respectively. The thickness of the EG is reduced to 10-30 nm as a result of CNT insertion into the graphene layers of the EG. The content of CNTs in the hybrids in-creases from 50 to 85 mass% with the increasing iron content. The conductive PBT modified by the hybrids ( 5 mass%) derived from EG loaded with 0. 75 mass% iron has a surface resistance of 1. 55í104Ω/cm2 , significantly lower than that ( 1. 55í1 010Ω/cm2 ) of the PBT modified by CNTs with the same amount of filler added.
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