Abstract
NO 2 sensing properties of pure WO 3 ceramics based on the gas sensitive nonlinear current–voltage ( I– V) characteristics have been investigated. Experimental results show that WO 3 ceramics exhibit nonlinear I– V characteristics and breakdown voltage shift to a high electric field upon exposure to NO 2, thus exhibiting NO 2 sensitivity, and the operating temperatures and voltages are relatively lower than the previous reported varistor-type gas sensors. The mechanism of gas sensitive nonlinear I– V characteristics has been explained by the alternations of the potential barriers at the grain boundaries. The present results demonstrate that WO 3 can be used as a new varistor-type gas sensor material.
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