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

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

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 mea...

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Bibliographic Details
Published in:Applied physics letters Vol. 86; no. 15
Main Authors: Guaitella, O., Gatilova, L., Rousseau, A.
Format: Journal Article
Language:English
Published: United States 11-04-2005
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ATOMS
CATALYSIS
ELECTRIC DISCHARGES
ELECTRIC FIELDS
OXYGEN
PELLETS
PHOTOCHEMISTRY
PLASMA
PRESSURE RANGE PA
PULSES
SEMICONDUCTOR MATERIALS
SPECTRA
TIME RESOLUTION
TITANIUM OXIDES
WALL EFFECTS
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Summary: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1900314