P Stone et al 1999 New J. Phys. 1 8 doi:10.1088/1367-2630/1/1/008
Reactive re-oxidation of reduced TiO2(110) surfaces demonstrated by high temperature STM movies
P Stone, R A Bennett and M Bowker
Show affiliationsThe re-oxidation of slightly reduced TiO2(110) surfaces by exposure to an oxygen pressure of ~2 × 10-7 mbar in the temperature range 473-1000 K occurs by re-growth of TiO2 overlayers by diffusion of Tin+ interstitials from the bulk. Starting with a (1 × 2) reconstructed surface, scanning tunnelling microscope images of the surface reacting under these conditions show that the (1 × 1) islands nucleate within the (1 × 2) layer and grow laterally. As the islands reach a critical size, which is temperature dependent, a new (1 × 2) layer begins to nucleate and grow. At both extremes of the temperature range nucleation of the second layer occurs before coalescence of the (1 × 1) islands, however, at temperatures between 673 and 773 K large areas of (1 × 1) surface form before growth of the second layer. The reaction is cyclic and several layers of TiO2 can be grown in this way.
- PACS
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61.72.J- Point defects and defect clusters
68.37.Ef Scanning tunneling microscopy (including chemistry induced with STM)
68.35.Fx Diffusion; interface formation
68.35.B- Structure of clean surfaces (and surface reconstruction)
- Subjects
- Dates
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Issue 1 (May 1999)
Received 7 January 1999
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Reactive re-oxidation of reduced TiO2(110) surfaces demonstrated by high temperature STM movies
P Stone et al 1999 New J. Phys. 1 8
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