Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 113, Issue 15, Pages 6150-6155Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp8108946
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Funding
- Office of Basic Energy Sciences, Division of Chemical Sciences, Geological and Biosciences
- Division of Materials Sciences and Engineering of the U.S. Department of Energy [DE-AC02-05CH 11231]
- Korea Research Foundation
- Korean Government
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We report the structure of the organic capping layers of platinum colloid nanoparticles and their removal by UV-ozone exposure. Sum frequency generation vibrational spectroscopy (SFGVS) studies identify the carbon-hydrogen stretching modes on poly(vinylpyrrolidone) (PVP) and tetradecyl tributylammonium bromide (TTAB)-capped platinum nanoparticles. We found that the UV-ozone treatment technique effectively removes the capping layer on the basis of several analytical measurements including SFGVS, X-ray photoelectron spectroscopy, and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The overall shape of the nanoparticles was preserved after the removal of capping layers, as confirmed by transmission electron microscopy (TEM). SFGVS of ethylene hydrogenation on the clean platinum nanoparticles demonstrates the existence of ethylidyne and di-sigma-bonded species, indicating the similarity between single-crystal and nanoparticle systems.
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