期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 4, 期 7, 页码 1167-1171出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz400496n
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资金
- DST-SERB Grant [SR/S2/LOP-0007/2011]
- DST Nanoscience Unit Grant at IISER-P [SR/NM/NS-42/2009]
- Department of Science and Technology (DST), India
Single-molecule surface-enhanced Raman scattering (SM-SERS) is an important application of localized surface plasmons in metallic nanostructures. Conventionally, Ag nanoparticles are used in solution-based SM-SERS experiments, but their usage is limited due to toxicity and oxidation issues. Au nanoparticle solutions are relatively biocompatible and SERS-active, but they do not facilitate large-scale SERS enhancement factors, which is an important prerequisite for SM-SERS. Under such constraints, silver-core gold-shell nanoparticles can be an excellent alternative for SM-SERS. Motivated by this, herein we report on the experimental evidence of SM-SERS sensitivity of Ag-core Au-shell nanoparticles by employing bianalyte method. Additionally, by detecting resonant molecules at femtomolar concentrations, we show that Ag-core Au-shell nanoparticle can be harnessed for ultrasensitive detection of molecules. The provided evidence will further motivate usage of such goldshell-based bimetallic nanostructures for SM-SERS in biological environments.
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