C L Pang et al 2006 Nanotechnology 17 5397 doi:10.1088/0957-4484/17/21/019
C L Pang1,2, O Bikondoa3, D S Humphrey2, A C Papageorgiou2, G Cabailh2, R Ithnin4, Q Chen2, C A Muryn3, H Onishi1 and G Thornton2
Show affiliationsElectron bombardment from a filament as well as voltage pulses from a scanning tunnelling microscope tip have been employed to modify the surface of TiO2(110). Individual H atoms are selectively desorbed with electrical pulses of +3 V 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 O2 to be followed with the microscope. Electrical pulses between +5 and +10 V induce local TiO2(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.
68.37.Ef Scanning tunneling microscopy (including chemistry induced with STM)
82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces
Issue 21 (14 November 2006)
Received 12 July 2006, in final form 15 September 2006
Published 13 October 2006
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