Enhanced NO2 sensing characteristics of Pd-functionalized networked In2O3 nanowires

Excellent gas detection of ZnO nanofibers by loading with reduced graphene oxide nanosheets

“…In air ambient, the adsorbed oxygen (such as O -) will be present at the grain boundaries of ZnO. The adsorbed species extract electrons by the reactions such as the following: 2O -+ V O .. + 2e -↔ O O[40]. Accordingly, the potential barrier to the flow of electrons will appear at the boundaries.…”

Synthesis and gas sensing properties of membrane template-grown hollow ZnO nanowires

“…Drobek et al [26] reported modulation of depletion layers in pristine ZnO and ZnO@ZIF-8 composite NWs in the presence of some reducing gases. Additionally, for other metal oxide NWs such as SnO 2 NWs [27] and In 2 O 3 NWs [28], the same sensing mechanism has been proposed.…”

Significantly enhanced temperature-dependent selectivity for NO2 and H2S detection based on In2O3 nano-cubes prepared by CTAB assisted solvothermal process

“…In the XPS spectrum of In 3d (see in Fig. 4a), the binding energy peaks at 443.9 and 451.5 eV are attributed to In 3d5/2 and In 3d3/2 of In 3+ ions, respectively, which proves the formation of In2O3 [22].…”

“…Among these metal oxides, nano-sized In2O3 is considered as one of the promising candidate materials to detect many hazardous gases including H2S [17], NO2 [18], CO [19], H2 [20] and C2H5OH [21] etc. In particular, NO2 or H2S sensors based on In2O3 nanostructures have been frequently reported in recent years [6,[22][23][24][25]. It is well known that morphology and microstructure of these metal oxides prominently influence their sensing properties.…”

“…It is well known that morphology and microstructure of these metal oxides prominently influence their sensing properties. Therefore, there are many studies to synthesize various morphologies of In2O3 in order to detect NO2 or H2S gases, including nanowires [22], nanospheres [23], nanofibers [24], nanorods [7], nanosheets [25], nanoparticles [6,26,27], etc. However, most of these studies are focused on sensing one specific gas of either NO2 or H2S.…”