Nanotechnology · 2006 · 46 citations · 27 references
Natural SciencesMaterials EngineeringMaterials ScienceElectronic MaterialsSurface ChemistrySurface ScienceElectron MicroscopyScanning Probe MicroscopySurface EnergeticsSurface MicroscopySurface OxidationSurface PhysicsMicroscope ImagingMicroscopyOxidation-induced Surface ReconstructionOxygen VacanciesOxygen Vacancies In Metal OxidesScanning Electron MicroscopySurface Oxidation MechanismsSurface Oxidation States
Electron bombardment from a filament as well as voltage pulses from a scanning tunnelling microscope tip have been employed to modify the surface of TiO<sub>2</sub>(110). Individual H atoms are selectively desorbed with electrical pulses of +3V from the scanning tunnelling microscope tip, whilst leaving the oxygen vacancies intact. This allows us to distinguish between oxygen vacancies and hydroxyl groups, which have a similar appearance in scanning tunnelling microscopy images. This then allows the oxygen vacancy-promoted dissociation of water and O<sub>2</sub> to be followed with the microscope. Electrical pulses between +5 and +10V induce local TiO <sub>2</sub>(110)1 × 2 reconstructions centred around the pulse. As for electron bombardment of the surface, relatively low fluxes increase the density of oxygen vacancies whilst higher fluxes lead to the 1 × 2 and other 1 × n reconstructions.
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The surface science of metal oxides
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