Gas sensing enhancement of aluminum-doped ZnO nanovase structure with many gas facile diffusivity paths

CO catalytic oxidation on Al-doped graphene-like ZnO monolayer sheets: a first-principles study

“…42 Inspired by the above findings, using first-principles calculations, herein we studied the effect of substituting Al for Zn atoms on the electronic structure of the g-ZnO monolayer sheet, and the adsorption of CO and O 2 as well as the oxidation of CO on the sheet. The element Al has been selected as the dopant due to that recently several experimental studies demonstrated that Al doping can significantly enhance the response of ZnO nanostructures at a lower temperature compared with the undoped counterparts towards reducing gases, such as CO [45][46][47][48] and ethanol, 47,[49][50][51] for which the underlying mechanism is still unclear. For the Al-doped ZnO nanostructures, it is easy for Zn 2+ in the ZnO lattice to be replaced by Al 3+ , due to the smaller ionic radius of Al 3+ (0.057 Å) than that of Zn 2+ (0.074 Å).…”

A highly sensitive ethanol gas sensor based on mesoporous SnO2 fabricated from a facile double-surfactant template method

“…The sensing performances of mesoporous SnO 2 toward 200 ppm ethanol are examined at a series of temperatures from 275°C to 310°C in order to optimize the working temperature, which maintain the equilibrium between the diffusion of the gas molecules and the absorbed oxygen species [15], as shown in Fig. 4a.…”

Sn–Ga co-doped ZnO nanobelts fabricated by thermal evaporation and application to ethanol gas sensors

“…The desired concentrations of the testing gases were carried by the static gas distribution method [11]. The sensitivities (S) of the sensor to an oxidizing gas were defined as S¼Rg/Ra, where Ra was the sensor resistance in air and Rg was that in a mixture of target gas and air.…”