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Dynamic Preconcentration of Gold Nanoparticles for Surface‐Enhanced Raman Scattering in a Microfluidic System
Author(s) -
Kim Kwang Bok,
Han JiHyung,
Choi Hyoungseon,
Kim Hee Chan,
Chung Taek Dong
Publication year - 2012
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201101771
Subject(s) - raman scattering , colloidal gold , microfluidics , materials science , nanoparticle , dynamic light scattering , polyelectrolyte , nanotechnology , raman spectroscopy , surface charge , surface modification , analytical chemistry (journal) , chemical engineering , chemistry , chromatography , optics , polymer , composite material , physics , engineering
A reversible preconcentration of gold nanoparticles (AuNPs) can be used for chemical analysis based on surface‐enhanced Raman scattering in a microfluidic system. AuNPs homogeneously dispersed in solution are locally preconcentrated by charge‐selective ion extraction through a pair of negatively charged polyelectrolyte plugs. This phenomenon creates dynamic hot spots among the preconcentrated AuNPs, which can also be redispersed as required.