J. Phys. Soc. Jpn. 84, 064716 (2015) [5 Pages]
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Effects of Hydrogen on the Electronic State and Electric Conductivity of the Rutile TiO2(110) Surface

Keisuke Fukada1, Masuaki Matsumoto1,2,, Kotaro Takeyasu1,, Shohei Ogura1, and Katsuyuki Fukutani1,
+ Affiliations
1Institute of Industrial Science, The University of Tokyo, Meguro, Tokyo 153-8505, Japan2Natural Science Division, Tokyo Gakugei University, Koganei, Tokyo 184-8501, Japan
Received January 12, 2015; Accepted April 17, 2015; Published May 29, 2015

The adsorption of atomic hydrogen on a rutile TiO2(110) surface was investigated by nuclear reaction analysis (NRA), ultraviolet photoelectron spectroscopy (UPS), and conductivity measurements. The TiO2(110) surface was annealed in O2 of 1 × 10−4 Pa, which is regarded as a quasi-stoichiometric surface. After exposure to atomic hydrogen, UPS showed a localized in-gap state (IGS) at about 0.8 eV below the Fermi level and downward band bending with a decrease in the work function. Along with these changes, the conductivity was increased by 2.9 µS/□. Our results indicate that hydrogen donates electrons to the substrate. The amount of charge transfer and electric conductivity are discussed on the basis of the experimental data.

©2015 The Physical Society of Japan
https://doi.org/10.7566/JPSJ.84.064716

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