Core鈥揝atellites Assembly of Silver Nanoparticles on a Single Gold Nanoparticle via Metal Ion-Mediated Complex

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• 作者：Inhee Choi ; Hyeon Don Song ; Suseung Lee ; Young In Yang ; Taewook Kang ; Jongheop Yi
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：July 25, 2012
• 年：2012
• 卷：134
• 期：29
• 页码：12083-12090
• 全文大小：424K
• 年卷期：v.134,no.29(July 25, 2012)
• ISSN：1520-5126

文摘

We report core鈥搒atellites (Au鈥揂g) coupled plasmonic nanoassemblies based on bottom-up, high-density assembly of molecular-scale silver nanoparticles on a single gold nanoparticle surface, and demonstrate direct observation and quantification of enhanced plasmon coupling (i.e., intensity amplification and apparent spectra shift) in a single particle level. We also explore metal ion sensing capability based on our coupled plasmonic core鈥搒atellites, which enabled at least 1000 times better detection limit as compared to that of a single plasmonic nanoparticle. Our results demonstrate and suggest substantial promise for the development of coupled plasmonic nanostructures for ultrasensitive detection of various biological and chemical analytes.