Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 12, Issue 14, Pages 3586-3590Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.1c00661
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Funding
- United States National Science Foundation [CMMI-1930769, CBET-1926612]
- US Department of Energy (DOE), Office of Science, Office of Biological and Environmental Research through the bioimaging technology development program
- US DOE, Office of Science, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences Biosciences
- United States Department of Energy [DEAC05-76RL1830]
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The study reveals that para-mercaptobenzoic acid molecules chemisorbed onto plasmonic silver nanocubes exist in at least two distinct configurations: S- and CO2- bound. By using high spatial resolution TER mapping, the distinct adsorption geometries can be distinguished with a pixel-limited spatial resolution of less than 5 nm under ambient laboratory conditions.
We interrogate para-mercaptobenzoic acid (MBA) molecules chemisorbed onto plasmonic silver nanocubes through tip-enhanced Raman (TER) spectral nanoimaging. Through a detailed examination of the spectra, aided by correlation analysis and density functional theory calculations, we find that MBA chemisorbs onto the plasmonic particles with at least two distinct configurations: S- and CO2- bound. High spatial resolution TER mapping allows us to distinguish between the distinct adsorption geometries with a pixel-limited (<5 nm) spatial resolution under ambient laboratory conditions.
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