Synthesis of Au@Ag core-shell nanocubes containing varying shaped cores and their localized surface plasmon resonances.

Jianxiao Gong, Fei Zhou, Zhiyuan Li, Zhiyong Tang

Laboratory for Nanomaterials, National Center for Nanoscience and Technology, Beijing 100190, China.

Langmuir : the ACS journal of surfaces and colloids 2012 Jun 19

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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.

Citation

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