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Gold Coating of Silver Nanoprisms
Author(s) -
Shahjamali Mohammad Mehdi,
Bosman Michel,
Cao Shaowen,
Huang Xiao,
Saadat Somaye,
Martinsson Erik,
Aili Daniel,
Tay Yee Yan,
Liedberg Bo,
Loo Say Chye Joachim,
Zhang Hua,
Boey Freddy,
Xue Can
Publication year - 2012
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201102028
Subject(s) - materials science , nanotechnology , surface plasmon resonance , coating , plasmon , shell (structure) , chemical engineering , optoelectronics , composite material , nanoparticle , engineering
Core–shell Ag@Au nanoprisms are prepared through a surfactant‐free seed‐mediated approach by taking advantage of the anisotropic structure of silver nanoprisms as seeds. The gold coating on the silver nanoprism surface is achieved by using hydroxylamine as a mild reducing agent, and the final fully gold‐coated prism structures are confirmed by microscopic and spectroscopic characterization. The resulting Ag@Au core–shell structure preserves the optical signatures of nanoprisms and offers versatile functionality and particularly better stability against oxidation than the bare silver nanoprism. The surface plasmon resonances of the core–shell Ag@Au nanoprisms can be tuned throughout the visible and near‐IR range as a function of the Au shell thickness. Such tailorable optical features and surfactant‐free gold shells have great potential applications in biosensing and bioimaging.