Shape-dependent evolution of Au@Ag core-shell nanocrystals by PVP-assisted N,N-dimethylformamide reduction
Shape-dependent Au@Ag core-shell nanocrystals have been successfully synthesized by using a two-step method. First, Au nanocrystal seeds with various shapes including single-crystal octahedron, single-twinned triangle or hexagon plate, and multiple-twinned decahedron were prepared by reducing HAuCl...
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my.utm.127522017-10-25T05:56:36Z http://eprints.utm.my/id/eprint/12752/ Shape-dependent evolution of Au@Ag core-shell nanocrystals by PVP-assisted N,N-dimethylformamide reduction Tsuji, Masaharu Matsuo, Matsuo Jiang, Peng Miyamae, Nobuhiro Ueyama, Daisuke Nishio, Michiko Hikino, Sachie Kumagae, Hisayo Kamarudin, Khairul Sozana Nor Tang, Xin-Ling QD Chemistry Shape-dependent Au@Ag core-shell nanocrystals have been successfully synthesized by using a two-step method. First, Au nanocrystal seeds with various shapes including single-crystal octahedron, single-twinned triangle or hexagon plate, and multiple-twinned decahedron were prepared by reducing HAuCl 4 in ethylene glycol (EG) in the presence of polyvinylpyrrolidone (PVP) as a polymer surfactant under the condition of microwave heating. Subsequently, thus-obtained Au seeds were added into N,N-dimethylformamide (DMF) solution containing Ag+ ions for overgrowth of Ag shells by an oil-bath heating. Transmission electron microscope (TEM) observation demonstrates that shapes of formed Ag shells strongly depend on shapes of initiated Au seeds. These newly produced triangular or hexagonal platelike, octahedral, and multiple-twinned decahedral Au@Ag nanocrystals are mainly dominated by the Ag shells having (111) facets. This case is completely different from that previously investigated by us in EG system where formed triangular-bipyramidal, cubic, and pentagonal rod/wire Au@Ag core-shell nanostructures are surrounded by the Ag shells with {100} facets. Our studies reveal that it is possible to controllably prepare the Au@Ag core/shell nanocrystal structures with optional uniform crystalline planes by the same Au seed source and different reaction solvent. American Chemical Society 2008-07 Article PeerReviewed Tsuji, Masaharu and Matsuo, Matsuo and Jiang, Peng and Miyamae, Nobuhiro and Ueyama, Daisuke and Nishio, Michiko and Hikino, Sachie and Kumagae, Hisayo and Kamarudin, Khairul Sozana Nor and Tang, Xin-Ling (2008) Shape-dependent evolution of Au@Ag core-shell nanocrystals by PVP-assisted N,N-dimethylformamide reduction. Crystal Growth and Design , 8 (7). 2528 -2536. ISSN 1528-7483 http://dx.doi.org/10.1021/cg800162t doi: 10.1021/cg800162t |
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QD Chemistry Tsuji, Masaharu Matsuo, Matsuo Jiang, Peng Miyamae, Nobuhiro Ueyama, Daisuke Nishio, Michiko Hikino, Sachie Kumagae, Hisayo Kamarudin, Khairul Sozana Nor Tang, Xin-Ling Shape-dependent evolution of Au@Ag core-shell nanocrystals by PVP-assisted N,N-dimethylformamide reduction |
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Shape-dependent Au@Ag core-shell nanocrystals have been successfully synthesized by using a two-step method. First, Au nanocrystal seeds with various shapes including single-crystal octahedron, single-twinned triangle or hexagon plate, and multiple-twinned decahedron were prepared by reducing HAuCl 4 in ethylene glycol (EG) in the presence of polyvinylpyrrolidone (PVP) as a polymer surfactant under the condition of microwave heating. Subsequently, thus-obtained Au seeds were added into N,N-dimethylformamide (DMF) solution containing Ag+ ions for overgrowth of Ag shells by an oil-bath heating. Transmission electron microscope (TEM) observation demonstrates that shapes of formed Ag shells strongly depend on shapes of initiated Au seeds. These newly produced triangular or hexagonal platelike, octahedral, and multiple-twinned decahedral Au@Ag nanocrystals are mainly dominated by the Ag shells having (111) facets. This case is completely different from that previously investigated by us in EG system where formed triangular-bipyramidal, cubic, and pentagonal rod/wire Au@Ag core-shell nanostructures are surrounded by the Ag shells with {100} facets. Our studies reveal that it is possible to controllably prepare the Au@Ag core/shell nanocrystal structures with optional uniform crystalline planes by the same Au seed source and different reaction solvent. |
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Article |
author |
Tsuji, Masaharu Matsuo, Matsuo Jiang, Peng Miyamae, Nobuhiro Ueyama, Daisuke Nishio, Michiko Hikino, Sachie Kumagae, Hisayo Kamarudin, Khairul Sozana Nor Tang, Xin-Ling |
author_facet |
Tsuji, Masaharu Matsuo, Matsuo Jiang, Peng Miyamae, Nobuhiro Ueyama, Daisuke Nishio, Michiko Hikino, Sachie Kumagae, Hisayo Kamarudin, Khairul Sozana Nor Tang, Xin-Ling |
author_sort |
Tsuji, Masaharu |
title |
Shape-dependent evolution of Au@Ag core-shell nanocrystals by PVP-assisted N,N-dimethylformamide reduction |
title_short |
Shape-dependent evolution of Au@Ag core-shell nanocrystals by PVP-assisted N,N-dimethylformamide reduction |
title_full |
Shape-dependent evolution of Au@Ag core-shell nanocrystals by PVP-assisted N,N-dimethylformamide reduction |
title_fullStr |
Shape-dependent evolution of Au@Ag core-shell nanocrystals by PVP-assisted N,N-dimethylformamide reduction |
title_full_unstemmed |
Shape-dependent evolution of Au@Ag core-shell nanocrystals by PVP-assisted N,N-dimethylformamide reduction |
title_sort |
shape-dependent evolution of au@ag core-shell nanocrystals by pvp-assisted n,n-dimethylformamide reduction |
publisher |
American Chemical Society |
publishDate |
2008 |
url |
http://eprints.utm.my/id/eprint/12752/ http://dx.doi.org/10.1021/cg800162t |
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1643646032420012032 |
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13.160551 |