Nanostructured Polymorphic Oxides for Advanced Chemosensors

摘要

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.