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Measurement of the surface-growth kinetics of reduced TiO2(110) during reoxidation using time-resolved scanning tunneling microscopy

Smith, R. D., Bennett, R. A. and Bowker, Michael 2002. Measurement of the surface-growth kinetics of reduced TiO2(110) during reoxidation using time-resolved scanning tunneling microscopy. Physical Review B: Condensed Matter and Materials Physics 66 , 035409. 10.1103/PhysRevB.66.035409

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Abstract

We have employed variable-temperature scanning tunneling microscopy (STM) to follow the kinetics of reoxidation of a nonstoichiometric TiO2 (110) single-crystal surface. The surface is seen to grow during reoxidation between 573 and 1000 K and at pressures from 5×10-8 to 2×10-6 mbar O2. The reaction proceeds by combination of gas-phase O2 with mobile interstitial Ti3+ from the bulk. The surface is observed to grow new layers of TiO2 in a cyclic process, resulting in the formation of alternate layers of (1×1) and cross-linked (1×2). The growth rate was calculated by measuring the area of new material grown on consecutive STM images of the same area. The rate shows a linear dependence upon oxygen pressure, with an Arrhenius plot indicating an activation barrier of ∼25±4 kJ mol-1 (0.25±0.04 eV/O2 molecule) for the surface reaction.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: American Physical Society
ISSN: 1098-0121
Last Modified: 04 Jun 2017 01:40
URI: http://orca-mwe.cf.ac.uk/id/eprint/1487

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