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Nanostructured metal oxides have been used as resistive gas sensing elements for the
detection of toxic gases, such as ammonia. Two processing techniques for producing
nanoparticles and/or nanofibers of semiconducting oxides are described, the sol-gel
route and the electrospinning technique. Sensing devices were prepared from these
materials. The importance of the oxide polymorphism on the gas sensing behavior is
discussed, using MoO3 as the model system. A generic and simple oxide system-gas
detected selection map is proposed based on the findings presented herein as well as on
published work in the gas sensor literature.
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