Surface-Enhanced Raman Spectroscopy Using Self-Assembled Silver Nanoparticles on Silicon Nanotips

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• 作者：Surojit Chattopadhyay ; Hung-Chun Lo ; Chih-Hsun Hsu ; Li-Chyong Chen ; and Kuei-Hsien Chen
• 刊名：Chemistry of Materials
• 出版年：2005
• 出版时间：February 8, 2005
• 年：2005
• 卷：17
• 期：3
• 页码：553 - 559
• 全文大小：485K
• 年卷期：v.17,no.3(February 8, 2005)
• ISSN：1520-5002

文摘

A new substrate for surface-enhanced Raman spectroscopy has been developed in the form of siliconnanotips, by electron cyclotron resonance plasma chemical vapor deposition, with apex diameters of ~2nm, lengths of 1000 nm, and densities of 10¹¹/cm². The surface areas of the nanotips are ~150 m²cm^-3,comparable with the best-quality porous silicon. Ion-beam-sputtered silver self-assembles on thesesubstrates as nanoparticles of 4-10 nm diameter and these metallic nanoparticles act as surfaceenhancement centers for Raman spectroscopy. Standard molecules such as Rhodamine 6G and trans-1,2-bis(4-pyridyl)ethylene (BPE) of concentrations in the range of 10^-6 to 10^-10 M have been studied onthese substrates and enhancements in the range of 10⁶ to 10⁸ were observed. These dry etched substrates,unlike those conventionally prepared by wet chemistry, are compatible with silicon device technologyand are remarkably stable and reproducible.