可调谐等离子体纳米颗粒基底上的表面增强拉曼散射
Surface-enhanced Raman scattering on tunable plasmonic nanoparticle substrates.
作者信息
Jackson J B, Halas N J
机构信息
Department of Physics and Astronomy, Laboratory of Nanophotonics, and Rice Quantum Institute, Rice University, Houston, TX 77005, USA.
出版信息
Proc Natl Acad Sci U S A. 2004 Dec 28;101(52):17930-5. doi: 10.1073/pnas.0408319102. Epub 2004 Dec 17.
Abstract
Au and Ag nanoshells are investigated as substrates for surface-enhanced Raman scattering (SERS). We find that SERS enhancements on nanoshell films are dramatically different from those observed on colloidal aggregates, specifically that the Raman enhancement follows the plasmon resonance of the individual nanoparticles. Comparative finite difference time domain calculations of fields at the surface of smooth and roughened nanoshells reveal that surface roughness contributes only slightly to the total enhancement. SERS enhancements as large as 2.5 x 10(10) on Ag nanoshell films for the nonresonant molecule p-mercaptoaniline are measured.
摘要
对金和银纳米壳作为表面增强拉曼散射（SERS）的基底进行了研究。我们发现纳米壳膜上的SERS增强与在胶体聚集体上观察到的显著不同，具体而言，拉曼增强遵循单个纳米颗粒的等离子体共振。对光滑和粗糙纳米壳表面场的比较有限时域计算表明，表面粗糙度对总增强的贡献很小。对于非共振分子对巯基苯胺，在银纳米壳膜上测得的SERS增强高达2.5×10¹⁰ 。
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