分析了螺旋炭纤维的微观结构, 发现其主要由纳米级石墨片层(nano graphite structure cell, NGSC, 约为5 nm*5 nm)构成, 其间夹杂着无定形碳和多层富勒烯等无序结构. 由于螺旋炭纤维具有螺旋结构, 其中的NGSC发生了一定的弯曲. 在宏观尺度上, 螺旋炭纤维表现出无序碳结构的特征. 根据结构分析的结果提出了表征螺旋炭纤维的几何参数, 并对不同螺旋炭纤维的螺旋角进行了比较分析. 结果表明, 虽然螺旋炭纤维的直径和螺距各不相同, 但是其螺旋角具有一定的规律. 在微观结构观察和几何构形分析的基础上提出了螺旋炭纤维的生长机理.
Based on the analysis of transmission electron microscopy (TEM), high resolution TEM (HRTEM), Raman spectroscopy and X--ray diffraction (XRD), the microstructure of carbon micro--coils was explored. A nano--graphitic structure cell (NGSC) was found to be the unit of carbon micro--coils with inclusion of amorphous carbon and multi--shell fullerenes between the NGSC. And the carbon micro--coil has a disordered structure in a macroscopic scale. The geometrical parameters of the carbon micro--coil were proposed. It was found that the chiral angle of micro--coils prepared by different research were similar, although they had different diameters and coil pitch. Combining the microstructure analyses and geometrical characterization, a possible growth process of carbon micro--coils was discussed.
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