Synthesis of Au@Ag core-shell nanocubes containing varying shaped cores and their localized surface plasmon resonances |
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Authors: | Gong Jianxiao Zhou Fei Li Zhiyuan Tang Zhiyong |
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Institution: | Laboratory for Nanomaterials, National Center for Nanoscience and Technology, Beijing 100190, China. |
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Abstract: | 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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