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We estimated the apparent size of the ‘hot site’ for surface-enhanced Raman scattering (SERS) located within the gaps between Pt nanoparticles and a flat Ag substrate. Initially, no Raman peaks were detected for 4-aminobenzenethiol (4-ABT) on a flat Ag substrate. Upon attaching 68nm-sized Pt nanoparticles onto the amine group of 4-ABT (thus denoted as Pt–4-ABT/Ag(flat)), Raman peaks were distinctly...
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