1 Department of Mechanical Engineering, Technical University of Denmark2 Materials and Surface Engineering, Department of Mechanical Engineering, Technical University of Denmark3 Department of Photonics Engineering, Technical University of Denmark4 Optical Microsensors and Micromaterials, Department of Photonics Engineering, Technical University of Denmark5 Danish Fundamental Metrology6 Université Lille Nord de France7 Centre for oil and gas – DTU, Center, Technical University of Denmark
The change in the surface potential of TiO2 coatings upon UV-illumination was investigated on the nanoscale using Scanning Kelvin Probe Force microscopy and on the micro-scale using photo-electrochemical measurements. A good correlation between the two techniques was obtained. The changes in the surface potential of TiO2 coatings upon UV-illumination are closely correlated to the band gap and thickness of the coatings. The inhomogeneity surface potential distribution of a 100 nm TiO2 film indicates a heterogeneous coating. Transition to a homogeneous surface potential distribution was observed with increasing thickness of the TiO2 coating.
R S C Advances, 2013, Vol 3, Issue 45, p. 23296-23302