Microstructures of Si nanowires (SiNW's) synthesized using laser ablation w
ere investigated by transmission electron microscopy. The SiNW's have a hig
h density of structural defects, which may play an important role in the fo
rmation of SiNW's and in the determination of the morphology of the nanowir
es. A model for the growth mechanism of the SiNW's was discussed on the bas
is of the observation. (C) 1998 American Institute of Physics. [S0003-6951(
98)00527-0].