Core-satellites assembly of silver nanoparticles on a single gold nanoparticle via metal ion-mediated complex

Inhee Choi, Hyeon Don Song, Suseung Lee, Young In Yang, Taewook Kang, Jongheop Yi
Journal of the American Chemical Society 2012 July 25, 134 (29): 12083-90
We report core-satellites (Au-Ag) 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-satellites, 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.

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