Conductivity and sensing properties of In2O3+ZnO mixed nanostructured films: Effect of composition and temperature

Green light activated hydrogen sensing of nanocrystalline composite ZnO-In2O3 films at room temperature

“…3 the optimal content of ZnO in the ZnO-In 2 O 3 composite should be near 60 wt.%. As was shown earlier, at high working temperature (400 °C) the highest response to H 2 was observed for ZnO-In 2 O 3 composites containing 20 wt.% and 80 wt.% ZnO 16 . The difference between the relative fractions of ZnO in the composite, at which the maximum gas response was observed, confirms different H 2 sensitive properties of the composites under illumination and heating.…”

“…As early reported, metal oxides composites 11–15 and particularly ZnO-In 2 O 3 composites 16–19 exhibit the enhanced gas sensitivity to reducing gases. However, the effect of visible illumination on the sensitivity of ZnO-In 2 O 3 composites to reducing gases was not investigated.…”

“…Detailed analysis was described elsewhere 16 . The resulting nanocomposite films are a mixture of nanocrystals of the corresponding oxides with variety of shapes and wide particle size distribution from 40 to 80 nm, which practically coincides with the sizes of the original commercial nanopowders claimed by the manufacturers.…”

Effect of electrical properties on gas sensitivity of polypyrrole/cds nanocomposites

“…Various technologies of nanoscience have been used for gas sensing measurement. So far, various materials like metal oxides and conducting polymers are widely used for gas detection purpose. Ammonia gas has been successfully detected using various polymers, metal oxides, and their composites .…”

Structure and physicochemical properties of nanostructured metal oxide films for use as the sensitive layer in gas sensors

“…The sensitivity of such oxides to the compo sition of the gas phase can reach one part of impurity per billion parts of solvent [2][3][4][5]. A number of studies (see, e.g., [6][7][8][9][10][11][12]) have investigated the mechanism of the interaction of adsorbed species (atoms and mole cules) with metal oxides having semiconductor prop erties. It has been found that the adsorption of a num ber of molecules on the surface of semiconductor nanoparticles causes a change in the charge carrier concentration in the conduction band of the semicon ductor, with whether it is an increase or decrease in the concentration being dependent on both the type of semiconductor and the nature of adsorbed molecules.…”