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Surface and Tip-Enhanced Raman Spectroscopy at the Plasmonic Hot Spot of a Coordination Complex-Conjugated Gold Nanoparticle Dimer
journal contribution
posted on 2017-08-01, 00:00 authored by Anushree Dutta, Arun ChattopadhyayWe report a synthetic
method to generate surface enhanced Raman scattering (SERS) active
gold nanodimer, by employing rationally designed co-ordination complex
of europium (Eu) metal with 4-mercaptobenzoic acid (4-MBA) and heterocyclic
phenanthroline ligands. The reaction between the Raman active 4-MBA
ligand of the Eu-complex and citrate-stabilized Au nanoparticles (cit-Au
NPs) led to selective dimerization in considerable yield and precise
control over hot-spot engineering to maximize SERS. Additionally,
scanning probe microscopy (SPM)-correlated tip-induced Raman enhancement
using He–Ne laser focusing on the plasmonically coupled Au
nanodimers helped obtain intense Raman signal at the spatial resolution
of single dimer. The average SERS amplification was measured to be
on the order of 109, whereas that in the presence of tip-enhancement
was found to be 104. This extraordinary Raman activity
of an inorganic complex-coupled gold nanodimer therefore augurs well
for applying chemical synthetic strategies in designing plasmonically
active assembled nanomaterials for applications in photovoltaics,
photocatalysis, biosensing, and single molecule spectroscopy.
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Keywords
molecule spectroscopySPMhot-spot engineeringcomplex-coupled gold nanodimer4- MBA ligandSERS amplificationheterocyclic phenanthroline ligands10 910 4gold nanodimerPlasmonic Hot Spotscanning probe microscopyCoordination Complex-Conjugated Gold Nanoparticle DimerRaman signalcit-Au NPsTip-Enhanced Raman SpectroscopyRaman activity
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