Article

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

World Class University Program of Chemical Convergence for Energy & Environment, School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul 151-742, Republic of Korea.
Journal of the American Chemical Society (impact factor: 9.91). 06/2012; 134(29):12083-90. DOI:10.1021/ja302684w pp.12083-90
Source: PubMed

ABSTRACT 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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Keywords

apparent spectra shift
 
coupled plasmonic core-satellites
 
direct observation
 
intensity amplification
 
metal ion
 
molecular-scale silver nanoparticles
 
plasmon coupling
 
plasmonic nanoassemblies
 
plasmonic nanostructures
 
quantification
 
single gold nanoparticle surface
 
single particle level
 
single plasmonic nanoparticle
 
substantial promise
 
ultrasensitive detection