Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 130, Issue 46, Pages 15581-15588Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja805606q
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Funding
- NSFC [20721063, 20673026, 20673024, 20873028, 20433020]
- Major State Basic Research Development Program [2003CB615807]
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In polyol synthesis at relatively low concentrations of polyvinylpyrrolidone (PVP, surface-capping agent), some micrometer-size Ag truncated decahedra with five-fold-twinned structure were clearly observed. This result indicates that the internal strain in the five-fold-twinned crystals is not sufficient to restrict their lateral growth. On the basis of first-principles calculation of their surface energies before and after the adsorption of surface-capping agent, it is proposed that the surface energy difference between the (100) and (111) facets (Delta phi((100)-(111))) plays an essential role in the aggressive growth of lateral (100) facets, overcoming the strain restriction. When enough PVP is adsorbed on the surfaces of Ag crystals, the Delta phi((100)-(111)) will evidently decrease, and then the strain restriction on the lateral growth becomes predominant, resulting in pentagonal anisotropic structures. Following this mechanism, diameter-tunable Ag wires have been synthesized by controlling the axial growth and the lateral growth separately at higher and lower PVP concentrations, respectively.
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