Plasma-photocatalyst interaction: Production of oxygen atoms in a low pressure discharge

Guaitella, O.; Gatilova, L.; Rousseau, A.
April 2005
Applied Physics Letters;4/11/2005, Vol. 86 Issue 15, p151502
Academic Journal
A pulsed dc low pressure discharge in air (210 Pa) is used to study the mechanisms of activation of a photocatalytic material (TiO2) under plasma exposure. It is first shown that the presence of TiO2 inside the plasma region leads to a strong increase of the reduced electric field. Time resolved measurement of the atomic oxygen density is performed by actinometry during a 10 ms pulse at a low repetition rate (1 Hz) with and without TiO2 pellets inside the plasma region. The presence of TiO2 pellets strongly increases the O atom density during the first millisecond, but this effect saturates for longer exposure times.


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