Sum frequency generation and catalytic reaction studies of the removal of the organic capping agents from Pt nanoparticles by UV-ozone treatment Page: 3 of 23
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role of the capping agent in the catalytic activity and selectivity is poorly understood in
spite of its importance in heterogeneous catalysis as an emerging model system.
Sum frequency generation vibrational spectroscopy (SFGVS) is an important tool
in the basic understanding of catalysis at the molecular level since it is able to identify
reaction intermediates under catalytic conditions. Several SFGVS studies on catalytic
reactions, including CO oxidation over colloid nanoparticles, were carried out earlier.
The vibrational signature of CO does not overlap with the capping agent vibrational
modes, facilitating the interpretation of the resulting spectra. 1-12 Other reactions, such as
pyridine hydrogenation, were also investigated, although only outside of the methyl-
methylene stretch vibrational region.13 Reactions more relevant to the industrial processes
of hydrogenation, cracking, etc, have been performed on platinum single crystals and
probed by SFGVS, but have not been carried out on nanoparticles due to the
The approach to investigate the role of capping agents involves the removal of
capping layers with UV/ozone (03) treatment. The UV/ozone oxidation has been used for
decades as a means of cleaning slightly soiled surfaces for a variety of applications. The
method typically uses ultraviolet light that includes the wavelengths of 185 and 257 nm,
where the former generates ozone upon interacting with molecular oxygen. The UV/
ozone oxidation process involves the simultaneous action of ozone and ultraviolet light,
which are responsible for the oxidation of the carbon containing compounds into carbon
dioxide and water.16 Ultraviolet radiation can also be used for polymer surface
modification with applications in photolithography, microfluidics, and bioengineering,
and its surface effects were studied using SFGVS, 17'1 which was used as well to
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Aliaga, Cesar; Park, Jeong Y.; Yamada, Yusuke; Lee, Hyun Sook; Tsung, Chia-Kuang; Yang, Peidong et al. Sum frequency generation and catalytic reaction studies of the removal of the organic capping agents from Pt nanoparticles by UV-ozone treatment, article, December 10, 2009; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc928545/m1/3/: accessed July 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.