Transformation of Ag Hexagonal Shape into Ag@Au Core-Shell Nanostructure in a Polymer-Mediated Polyol Process |
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| Authors: | Yun Zhi Fu Xiu Dong Xiang Jian He Liao Jiu Mo Wang |
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| Institution: | 1. College of Materials Science and Chemical Engineering , Hainan University , Danzhou , P. R. China yzhfu@sohu.comUT;3. Department of Computational Science , China University of Petroleum , Dongying , P. R. China;4. College of Materials Science and Chemical Engineering , Hainan University , Danzhou , P. R. China |
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| Abstract: | In this article, we report the galvanic replacement reaction between an Ag template and HAuCl4 · 4H2O in aqueous solution transforms 33.3 nm hexagonal shape Ag to Ag@Au core-shell nanostructure in the presence of the surface-regulating polymer poly (vinyl pyrrolidone) (PVP). By controlling the molar ratio of Ag to HAuCl4 · 4H2O, the extinction peak of resultant can be continuously tuned from the blue to the near infrared sections for both absorption and scatting. The results of UV-vis, XRD, TEM, and SEM show the different characters on the Ag and Ag@Au core-shell nanostructure which suggest that the transformation of Ag into Ag@Au by controlling their dimensions as well as the thickness and porosity of their walls. |
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| Keywords: | Ag hexagonal shape nanoparticles Ag@Au core-shell nanostructure |
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