Understanding TiO2 as a photocatalyst and resistive switch - Professor Geoff Thornton (UCL)
1:00pm - 2:00pm /
Tuesday 17th May 2016
/ Venue: Stephenson Institute Seminar Room Chadwick Building
- 0151 795 2156
- Yvonne Grunder
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Much attention has been focused on titanium dioxide due to its numerous scientific and industrial to its applications in photocatalysis, electrochemistry, active coatings, gas sensors, etc. In this talk I will describe fundamental studies of model sytems aimed at understanding factors associated with photocatalysis and resistive switching. Photocatalysis has long been thought to be associated with photoexcitation across the 3 eV bandgap of TiO2. In recent work we have shown that there is another channel that opens at about 3 eV, which corresponds to photoexcitation from band gap states to OH related states in the conduction band region (J. Phys. Chem. Lett. 6 3391-3395 (2015)). Resistive switching involves the formation and removal of conducting tracks. Here I will discuss a way of simulating this in a simple way by manipulating oxygen vacancies.