Mechanism of Electron-Induced Hydrogen Desorption from Hydroxylated Rutile TiO2 (110)
The mechanism of hydrogen desorption from rutile TiO{sub 2}(110)-(1 x 1) was studied by injecting electrons with controlled energy and flux into single surface hydroxyls (OH) in cryogenic scanning tunneling microscopy (STM). Desorption proceeds without a clear threshold already at much lower energies than reported previously. Our analysis identifies a transfer of H atoms from the TiO{sub 2} surface to the STM tip, triggered by vibrational heating due to inelastic electron tunneling, as the desorption mechanism. The reversible H-atom transfer between sample and tip can be used as a tool to discriminate OH from other surface species on TiO{sub 2} and to control the density and configuration of OH by selective removal and redeposition of H atoms on the oxide surface.
- Research Organization:
- Brookhaven National Laboratory (BNL) Center For Functional Nanomaterials
- Sponsoring Organization:
- DOE - Office Of Science
- DOE Contract Number:
- AC02-98CH10886
- OSTI ID:
- 1004646
- Report Number(s):
- BNL--94230-2011-JA; KC020401H
- Journal Information:
- Journal of Physical Chemistry C, Journal Name: Journal of Physical Chemistry C Journal Issue: 49 Vol. 114; ISSN 1932-7455; ISSN 1932-7447
- Country of Publication:
- United States
- Language:
- English
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