Bioplasmonic Alloyed Nanoislands Using Dewetting of Bilayer Thin Films

Unlike monometallic materials, bimetallic plasmonic materials offer extensive benefits such as broadband tuning capability or high environmental stability. Here we report a broad range tuning of plasmon resonance of alloyed nanoislands by using solid-state dewetting of gold and silver bilayer thin f...

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Bibliographic Details
Published inACS applied materials & interfaces Vol. 9; no. 42; pp. 37154 - 37159
Main Authors Kang, Minhee, Ahn, Myeong-Su, Lee, Youngseop, Jeong, Ki-Hun
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 25.10.2017
Subjects
bioplasmonic substrates
AuAg alloy
plasmonic nanostructures
solid-state dewetting
alloyed nanoislands
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Summary:Unlike monometallic materials, bimetallic plasmonic materials offer extensive benefits such as broadband tuning capability or high environmental stability. Here we report a broad range tuning of plasmon resonance of alloyed nanoislands by using solid-state dewetting of gold and silver bilayer thin films. Thermal dewetting after successive thermal evaporation of thin metal double-layer films readily forms AuAg-alloyed nanoislands with a precise composition ratio. The complete miscibility of alloyed nanoislands results in programmable tuning of plasmon resonance wavelength in a broadband visible range. Such extraordinary tuning capability opens up a new direction for plasmonic enhancement in biophotonic applications such as surface-enhanced Raman scattering or plasmon-enhanced fluorescence.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.7b10715