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Citation: FU Xiao-Feng, ZOU Hua-Min, ZHOU Li, ZHOU Zhang-Kai, YU Xue-Feng, HAO Zhong-Hua. Growth Mechanism of Penta-twinned Ag Nanowires Synthesized by Polyol Process[J]. Acta Physico-Chimica Sinica, ;2008, 24(05): 781-787. doi: 10.3866/PKU.WHXB20080508 shu

Growth Mechanism of Penta-twinned Ag Nanowires Synthesized by Polyol Process

1.
Department of Physics, Wuhan University, Wuhan 430072, P. R. China; Center for Electron Microscopy, Wuhan University, Wuhan 430072, P. R. China; Key Laboratory of Acoustic and Photonic Materials and Devices of the Ministry of Education, Wuhan University, Wuhan 430072, P. R. China

Received Date: 26 December 2007
Available Online: 24 March 2008

Multi-twinned silver nanoparticles and nanowires were synthesized by polyol process in the presence of surfactant poly (vinyl pyrrolidone) (PVP) K30. In order to study the growth mechanism, silver nanowires were synthesized under various conditions by changing n(PVP)/n(AgNO3) and the state of agitation. A comparative study of these nanowires was performed by means of transmission electron microscopy (TEM) and optical absorption spectra. The results showed that there coexisted two different growth modes, and hence the competition between them. According to one mode, the as-synthesized nanowires grew along {111} faces, by which the penta nal pyramid-shaped tip was enclosed, as the active facets. By another mode, the nanowires grew layer by layer along{110} face, which was perpendicular to the wire axis [110], as the active facet. There weremany stacking faults and dislocations in the nanowires deformed plastically during the preparation of the nanowires. The fresh fracture surfaces of the nanowires were the favorable positions where the nucleation and growth of newly formed crystals might take place.
- Growth mechanism; Silver nanowires; Polyol process; Penta-twinning
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