Sum frequency generation and catalytic reaction studies of the removal of the organic capping agents from Pt nanoparticles by UV-ozone treatment Page: 4 of 23
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investigate the effect of ultraviolet radiation and ozone on typical organic substances
present in the upper atmosphere.19 Earlier results of removal of the capping agent using
the same method were furthermore reported for gold nanospheres with satisfactory
results, as well as for bimetallic PtFe nanoparticles.2,21
In this work, the application of UV/ozone oxidation is used to remove the capping
agent so that SFGVS catalysis studies at the surface of nanoparticles catalysts can be
carried out. Previous attempts using methods such as plasma cleaning, hydrogen
treatment, or heat treatment under different gaseous atmospheres proved inefficient,
because of the irreversible modification of the shape and distribution of the nanoparticles.
We monitored the removal of the capping agent from the surface of platinum nanocubes
with various analytical methods including SFGVS, XPS, and DRIFTS. The shape and
spatial distribution of the nanoparticles are examined with SEM and TEM before and
after UV/ozone treatment. In addition ethylene hydrogenation at room temperature and
atmospheric pressure is performed at the surface of the catalytic nanocubes and the
reaction intermediates are probed with SFGVS.
II. Experimental procedures
II.a. Synthesis of TTAB or PVP capped nanoparticles.
The nanoparticles we used in this study consist of 10 nm platinum cubes capped
with tetradecyl trimethylammonium bromide (TTAB), or polivynil pyrrolidone (PVP).
TTAB coated platinum nanocubes were synthesized according to literature methods.6
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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/m1/4/: accessed July 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.