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
Langmuir: the ACS Journal of Surfaces and Colloids 2012 June 19, 28 (24): 8959-64
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.

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