碳微线圈的合成、表征及形态研究

以镍为催化剂,在助剂噻吩的作用下,采用乙炔高温热解法合成了规则、均匀、具有双螺旋结构的碳微线圈.用同一次实验所得的产物,从水平与垂直两个方向研究了碳微线圈形态的变化与分布规律,并进一步通过改变反应器的结构做了比较实验,结合SEM,TEM,SAED和XRD等表征手段对这一规律进行分析研究.结果表明,反应气流的流向以及催化剂在反应过程中发生的物理和化学变化是导致碳微线圈形态变化的两个重要原因.另外,对碳微线圈的结构、生长机理以及噻吩的作用进行了初步研究.

Synthesis, Characterization and Morphology Variety of Carbon Micro-coils

Regular carbon micro-coils were obtained by a catalytic pyrolysis method with acetylene as a carbon resource and Ni as a catalyst and thiophene as a promotor. The morphology variety of carbon micro-coils which were obtained in different regions of the deposited furnace were examined in detail. Then, different reaction tubes were used to make the control experiments. The results of SEM, TEM, SAED and XRD show that the direction of gas current and the physical or chemical changes of catalyst grain cause the morphology variety of carbon micro-coils. Moreover, the structure, growth mechanism of carbon micro-coils and the effect of thiophene were discussed.