C60-C70 two-component fullerene whiskers were synthesized by a liquid-liquid interfacial precipitation (LLIP) method using various ratios of C70 to C60, and were analyzed for their dimensions using scanning electron microscopy (SEM). The diameters and the lengths of the C60-C70 fullerene whiskers show ever-increasing W-type graphs which have two local minimal values, respectively. The shape of the graphs were resulted from changing of crystal growth rate with varying of fullerene compositions of mother solution. The carcinogenicity of C60-C70 fullerene whiskers can be evaluated using the C60-C70 fullerene whiskers whose dimensions and physical factors are specified, and they will be applied to various products such as the active layer materials of solar cells and the anchor materials.
