期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 15, 期 30, 页码 12680-12687出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3cp50714a
关键词
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资金
- National Science Foundation [CBET-0744879, CMMI-1000686]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1000686] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0744879] Funding Source: National Science Foundation
Here we report a simple bottom-up technology for scalably fabricating gold nanodimple arrays with tunable nanostructures for surface-enhanced Raman scattering (SERS). Double-layer silica colloidal crystal-polymer nanocomposites with an unusual non-close-packed structure created using a spin-coating technique are utilized as structural templates. A variety of nanodimple structures, including simple monolayer voids, nanoring-like nanodimples, and binary-void nanodimples, can be reproducibly templated over wafer-sized areas by simply controlling the conditions during an oxygen plasma etching process. Normal-incidence specular reflection measurements show that the resulting gold nanodimple arrays exhibit tunable surface plasmon properties. The efficient electromagnetic coupling between neighboring nanodimples and inner-outer walls of nanoring-like nanodimples leads to high SERS enhancement factors (>10(8)). Numerical simulations based on a finite-difference time-domain model complement the experimental measurements, showing the spatial distribution of electromagnetic hot spots surrounding the periodic gold nanodimple arrays.
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