Metal-oxide nanostructure and gas-sensing performance

Enhanced NO 2 gas sensing performance of bare and Pd-loaded SnO 2 thick film sensors under UV-light irradiation at room temperature

“…Consequently, the number of electrons transferred to chemisorbed NO2 and the magnitude of the resistance change increases. Moreover, some authors also reported that NO2 is more easily adsorbed on Pd and then is spilled over to the SnO2 surface [19,[40][41][42][43]. Figure 11 shows the recovery times (trec) for some bare and Pd-loaded SnO2 sensors which were synthesized by the assistance of microwave irradiation.…”

Comparison of the enhanced gas sensing properties of tin dioxide samples doped with different catalytic transition elements

“…concentrations. The behavior of resistance decreasing is due to the increasing of carrier concentration, which is ascribed to the releasing of conduction electrons from the ionized oxygen absorbed on the SnO 2 semiconductor surface [41]. In other words, the reaction between reactive oxygen adions and reducing gases would give the electrons back to the conduction band of SnO 2 .…”

A design of high performance gas sensor array with discrete islands of Au catalyst for increasing of zinc oxide nanowire junctions

“…It is desirable to have nanostructured ZnO materials with controlled morphology. Different geometrical structures of ZnO, such as nanoplates, thin film, nanoparticles, nanorods, nanotubes, nanofibers, and nanowires have been developed for gas sensing applications [1][2][3][4][5][6]. Among those structures, the nanowires of ZnO turn out to be the first class candidates for many gas sensing applications, because their diameters can be tailored [4,5] to be approximately the Debye length, that enables the total depletion of nanowires when adsorbing gas molecules resulting in highly sensitivity.…”