Charge transfer in Cr adsorption and reaction at the rutile TiO2(110) surface
Michael Nolan1, James S Mulley, Roger A Bennett
1Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland. michael.nolan@tyndall.ie
Abstract:
The rutile TiO2(110) surface has been doped with sub-monolayer metallic Cr, which oxidises and donates charge to specific surface Ti ions. X-Ray and ultra violet photoemission spectroscopy and first principles density functional theory with Hubbard U are used to assign the oxidation states of Cr and surface Ti and we find that Cr2+ forms on bridging oxygen ions and a 5-fold coordinated surface Ti atom is reduced to Ti3+ and the Cr ions readily react with oxygen (to Cr3+), which leads to depletion of surface Ti3+ 3d electrons.
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