Physical mechanisms underpinning conductometric gas sensing properties of metal oxide nanostructures

In the domain of gas sensing, metal oxide nanostructures have been demonstrated to very attractive properties due their large surface-over-volume ratio, combined with possibility use multiple materials and multi-functional properties. Here, we review basic physical principles underlying transducer function nanostructures, from single nanostructure networks. These adapted describe response more complex such as heterostructures, combining two different materials, or a oxide, in order further enhance sensitivity selectivity devices. We finally present activation by light exposure promising alternative standard method based on high temperature activation, which is earning increasing consensus perspective low-power Internet Things applications.