Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 101, Issue 1-2, Pages 161-174Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2004.02.048
Keywords
molybdenum oxide; electrical conductivity; gas sensors
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Electrical conductivity and gas sensing properties of MoO3 are investigated. The electrical conductivity is found to be independent of oxygen partial pressure in the temperature range 510-773 K. Two distinct conduction processes were identified from the conductivity experiments carried out under ambient air, moist oxygen, and moist argon. The conductivity in the low temperature range (510-578 K) are attributed to species arising from the reversibly inserted water molecules into MoO3 lattice. The conduction process in the high temperature region (578-773 K) are attributed to the non-stoichiometry existing in the sample due to the presence of Mo5+ ions which was confirmed by EPR and XPS investigations. Sensing characteristics of MoO3 towards NH3, H-2, and LPG were studied. Experiments showed that the ammonia sensing mechanism of MoO3 involved the formation of molybdenum suboxides and nitride. (C) 2004 Elsevier B.V. All rights reserved.
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