The Interfacial Nature of TiO2 and ZnO Nanoparticles Modified by Gold Nanoparticles

Title
The Interfacial Nature of TiO2 and ZnO Nanoparticles Modified by Gold Nanoparticles
Author(s)
도예지[도예지]최재수[최재수]김석규손영구
Keywords
CATALYTICALLY ACTIVE GOLD; AU/TIO2 CATALYST; CO-OXIDATION; SURFACE; AU; TIO2(110); SIZE; XPS; NANOCOMPOSITES; CHEMISTRY
Issue Date
201008
Publisher
KOREAN CHEMICAL SOC
Citation
BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.31, no.8, pp.2170 - 2174
Abstract
The surfaces of TiO2 and ZnO nanoparticles have been modified by gold (Au) nanoparticles by a reduction method in solution. Their interfacial electronic structures and optical absorptions have been studied by depth-profiling X-ray photoelectron spectroscopy (XPS) and UV-vis absorption spectroscopy, respectively. Upon Au-modification, UV-vis absorption spectra reveal a broad surface plasmon peak at around 500 nm. For the as-prepared Au-modified TiO2 and ZnO, the Au 4f(7/2) XPS peaks exhibit at 83.7 and 83.9 eV, respectively. These are due to a charge transfer effect from the metal oxide support to the Au. For TiO2, the larger binding energy shift from that (84.0 eV) of bulk Au could indicate that Au-modification site of TiO2 is different from that of ZnO. On the basis of the XPS data with sputtering depth, we conclude that cationic (1+ and 3+) Au species, plausibly Au(OH) x (x = 1-3), commonly form mainly at the Au-TiO2 and Au-ZnO interfaces. With Ar+ ion sputtering, the oxidation state of Ti dramatically changes from 4+ to 3+ and 2+ while that (2+) of Zn shows no discernible change based on the binding energy position and the full-width at half maximum (FWHM).
URI
http://hdl.handle.net/YU.REPOSITORY/23823http://dx.doi.org/10.5012/bkcs.2010.31.8.2170
ISSN
0253-2964
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이과대학 > 화학생화학부 > Articles
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