【摘要】 在较低温度(450-800℃)下以氧化铝基板负载的镍为催化剂,催化热解乙炔合成碳纳米纤维.扫描电镜和透射电镜观察表明,反应温度决定碳纳米纤维的尺寸和结构,在550℃下制备的碳纳米纤维一般具有类似弹簧状的结构,而在700℃下制备的碳纳米纤维则偏向于片状堆积结构,并介绍了片状堆积结构的生长机理.更多还原

【Abstract】 Carbon nanofibers were synthesized by catalytic pyrolysis of acetylene on Ni-coated alumina flakes at 450-800℃. SEM and TEM observations indicated that the diameters and structure of carbon nanofibers were strongly affected by temperatures, the carbon nanofibers synthesized at 550℃ had a coil-like shape, while the products obtained at 700℃ contained many plateletstacked nanofibers. A growth model was proposed to explain the structure of the platelet-stacked nanofibers.更多还原