Synthesis of Au@Ag core-shell nanocubes containing varying shaped cores and their localized surface plasmon resonances.
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.
Laboratory for Nanomaterials, National Center for Nanoscience and Technology, Beijing 100190, China.
Jianxiao
J
Gong
Fei
F
Zhou
Zhiyuan
Z
Li
Zhiyong
Z
Tang
D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D012834:Silver / Q000737:chemistry*; D020349:Surface Plasmon Resonance; D013499:Surface Properties
D012834:Silver; D006046:Gold