以Ni粉为催化剂,用化学气相沉积(CVD)法,在高温下催化热解乙炔(C2H2),制备出了螺旋形碳晶须材料.实验结果表明,Ni粉的颗粒尺寸及表面形貌对螺旋形碳晶须的形貌、直径、螺距有较大的影响.用直径为几十微米,表面为熔融状的小颗粒Ni粉作催化剂,制备的碳晶须呈绞绳状的较多,螺旋直径为130-180nm,螺距为100-350nm;用直径为几百纳米、表面为毛刺状的Ni粉作催化剂,则制备的碳晶须呈管状的较多,其螺旋直径为280-310nm,螺距为150-180nm.
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