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Issue 26, 2016
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Manipulating the charge state of Au clusters on rutile TiO2(110) single crystal surfaces through molecular reactions probed by infrared spectroscopy

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Abstract

The charge state of Au clusters deposited on rutile TiO2(110) single crystal surfaces was studied by UHV-FTIRS using CO as a probe. The as-deposited Au clusters on oxidized TiO2(110) surfaces are electrically neutral and are identified by the 2105–2112 cm−1 vibrational frequency of adsorbed CO depending on Au coverage. Annealing Au/TiO2(110) in a moderate O2 atmosphere at 400 K blue shifts the CO vibrational frequency by only 2–3 cm−1 both on bare TiO2(110) surfaces and on Au clusters. However, NO exposure blue shifts the CO vibrational frequency by 16–26 cm−1 for CO adsorbed on Au atoms near the interface and by 3–4 cm−1 for CO adsorbed on top of Au clusters. As the acceptors of the intense charge transfer from Au, the Oa atoms generated through (NO)2 → N2O + Oa reactions on the small fraction of the bare TiO2(110) surface reside around the Au/TiO2(110) interface perimeter, causing the neutral Au0 to be cationic Auδ+ states. This is a new approach to manipulate the charge state of Au clusters on oxide surfaces, which may be helpful in regulating the catalytic redox reactions on oxide supported metal systems.

Graphical abstract: Manipulating the charge state of Au clusters on rutile TiO2(110) single crystal surfaces through molecular reactions probed by infrared spectroscopy

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Article information


Submitted
08 Apr 2016
Accepted
01 Jun 2016
First published
01 Jun 2016

Phys. Chem. Chem. Phys., 2016,18, 17660-17665
Article type
Paper

Manipulating the charge state of Au clusters on rutile TiO2(110) single crystal surfaces through molecular reactions probed by infrared spectroscopy

Y. Cao, S. Hu, M. Yu, T. Wang, S. Huang, S. Yan and M. Xu, Phys. Chem. Chem. Phys., 2016, 18, 17660
DOI: 10.1039/C6CP02324J

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