以采用电阻加热法制备的纳米铜粒子为催化剂,在低温下催化乙炔制备了纳米碳纤维.所制备的纳米碳纤维具有螺旋型和直线型两种形貌.采用透射电子显微镜(TEM)和扫描电子显微镜(SEM)对纳米碳纤维进行了表征.纳米铜催化剂粒子在催化纤维的生长过程中,经历了一个重要的形状变化过程.催化剂粒子尺寸对所制备的纳米碳纤维的形貌有很大的影响.通常有两根螺旋纳米碳纤维以对称模式在单个粒径小于50 nm的催化剂粒子上生长,它们的旋向相反,但是具有相同的螺旋直径、螺旋长度、螺旋缠绕程度和纤维直径.较大尺寸的催化剂粒子易生长直线型纳米碳纤维.
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