期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 20, 期 33, 页码 6891-6895出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0jm00884b
关键词
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Hot spots have the contradictively geometrical requirements for both the narrowest interstices to provide strong near-field coupling, and sufficient space to allow entrance of the analytes. Herein, a two-step method is employed to create hot spots within hybrid nanostructures, which consist of self-supported nanoporous gold films with the absorbed probes and subsequent nanoparticle conjugates without surface agents or mechanical motion. The molecules confined into 1 nm interstice exhibit 2.9 x 10 7 times enhancement in Raman scattering compared to pure nanoporous gold. Giant enhancement primarily results from strong near-field coupling between nanopore and nanoparticle, which is theoretically confirmed by finite-difference time-domain simulation. Excellent detection limits toward 10(-11) mol l(-1) offer an opportunity to track spatial orientation of single molecule and engineer hybrid nanostructures as commercial SERS substrates.
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