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We have synthesized Au@Ag core-shell nanocubes containing Au cores with varying shapes and sizes through modified seed-mediated methods. Bromide ions are found to be crucial in the epitaxial growth of Ag atoms onto Au cores and in the formation of the shell's cubic shape. The Au@Ag core-shell nanocubes exhibit very abundant and distinct localized surface plasmon resonance (LSPR) properties, which are core-shape and size-dependent. With the help of theoretical calculation, the physical origin and the resonance mode profile of each LSPR peak are identified and studied. The core-shell nanocrystals with varying shaped cores offer a new rich category for LSPR control through the plasmonic coupling effect between core and shell materials.


Jianxiao Gong, Fei Zhou, Zhiyuan Li, Zhiyong Tang. Synthesis of Au@Ag core-shell nanocubes containing varying shaped cores and their localized surface plasmon resonances. Langmuir : the ACS journal of surfaces and colloids. 2012 Jun 19;28(24):8959-64

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PMID: 22299655

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