Abstract
Abstract ZnO nanowires were grown onto SnO 2 film coated on Si substrate using a vapor transport method. Zn vapor was found to play important roles in reducing SnO 2 and in being oxidized as a ZnO layer. The growth mechanism of ZnO nanowires was revealed to be a two-step process of Zn–SnO 2 redox reaction and Sn catalyzed V–L–S (vapor–liquid–solid) growth; initially, Zn vapor atoms arriving at the SnO 2 surface reduce the SnO 2 to Sn and O atoms and diffuse into the SnO 2 layer to form a ZnO layer. The reduced Sn atoms diffuse out of the SnO 2 layer and are agglomerated to form Sn liquid droplets. Then, the Sn droplets on the surface of ZnO layer serve as a catalyst for the catalytic V–L–S growth of ZnO nanowires.
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