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- W2949094903 abstract "Not all regions of optical field nanolocalization and enhancement are suitable sites for chemical transformations on plasmonic metals. We illustrate the concept using chemically functionalized monocrystalline gold platelets in aqueous solution imaged using a Au-coated tip-enhanced Raman scattering (TERS) probe. For our proof-of-principle study, we select a model plasmon-driven chemical process, namely, the dimerization of p-nitrothiophenol (NTP) to dimercaptoazobenzene. Consistent with recent observations from our group, we find that TERS maps at vibrational resonances corresponding to NTP trace the optical fields that are maximally enhanced toward the edges of the platelets. Conversely, simultaneously recorded product maps reveal that the dimerization process occurs only at specific sites on our substrate. Given the uniformity of the structures and local optical fields at the edges of the gold platelets, our results suggest that molecular crowding and steric effects play a key role in our case of plasmon-driven NTP dimerization at the gold–water interface." @default.
- W2949094903 created "2019-06-27" @default.
- W2949094903 creator A5018131731 @default.
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- W2949094903 date "2019-05-10" @default.
- W2949094903 modified "2023-10-18" @default.
- W2949094903 title "Nanoscale Chemical Reaction Imaging at the Solid–Liquid Interface via TERS" @default.
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- W2949094903 doi "https://doi.org/10.1021/acs.jpclett.9b00935" @default.
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