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Title: Zinc oxide as an ozone sensor
Author: Martins, Rodrigo
Fortunato, Elvira
Nunes, P.
Ferreira, I.
Marques, A.
Bender, M.
Katsarakis, N.
Cimalla, V.
Kiriakidis, G.
Issue Date: Aug-2004
Publisher: American Institute of Physics
Abstract: This work presents a study of intrinsic zinc oxide thin film as ozone sensor based on the ultraviolet sUVd photoreduction and subsequent ozone re oxidation of zinc oxide as a fully reversible process performed at room temperature. The films analyzed were produced by spray pyrolysis, dc and rf magnetron sputtering. The dc resistivity of the films produced by rf magnetron sputtering and constituted by nanocrystallites changes more than eight orders of magnitude when exposed to an UV dose of 4 mW/cm2. On the other hand, porous and textured zinc oxide films produced by spray pyrolysis at low substrate temperature exhibit an excellent ac impedance response where the reactance changes by more than seven orders of magnitude when exposed to the same UV dose, with a response frequency above 15 kHz, thus showing improved ozone ac sensing discrimination.
Description: Journal of Applied Physics, Vol. 96, nº3
ISSN: 0021-8979
Appears in Collections:FCT: CENIMAT - Artigos em revista internacional com arbitragem científica

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