Abstract
We report the effect of stacking fault on the formation of the saw-teeth of ZnS nanosaws, which were synthesized by a hydrogen-assisted thermal evaporation method. The stem of ZnS nanosaw grows along the [101̅0] direction and possesses wurtzite (WZ) structure, while the saw-tooth grows along the [111] direction and possesses zinc blende (ZB) and WZ mixed structure. The observation of morphology evolution indicates that the stem and saw-tooth must have formed simultaneously. Detailed structure analysis shows that the stacking faults are crucial to the formation of saw-teeth. The stacking faults can cause phase transformation (WZ → ZB structure). Accordingly, step-like boundaries, which consist of the boundary parallel to the close-packed planes and the perpendicular boundary at the growth front, are forming. The ZB ZnS part on the boundaries serves as the nucleus of the saw-tooth and leads the subsequent growth. A defect inducing growth model is proposed to elucidate the detailed growth process.
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