Room temperature H2S gas sensing properties of In2O3 micro/nanostructured porous thin film and hydrolyzation-induced enhanced sensing mechanism

Ultra-sensitive UV and H2S dual functional sensors based on porous In2O3 nanoparticles operated at room temperature

“…For the H2S sensing, in addition to the adsorption and desorption sensing mechanism, Xu et al [ 57] and Wang et al [ 19] proposed another sensing mechanism for the In2O3 materials based on thermodynamic analysis. It is proposed that a sulfuration process can happen on the surfaces of In2O3 when they are exposed to H2S gas at room temperature, and the reaction equation can be listed below: [ 19,57] In2O3(s) + 3H2S(g) → In2S3(s) + 3H2O(g)…”

“…So far, various types of In2O3 nanostructures have been synthesized and used as sensing materials, for example, nanofibers [12], nanowires [13], nanospheres [14], nanocubes [15,16], nanoplatelets [17] and nanoparticles [9,11,[18][19][20]. However, most reported In2O3 nanomaterials are relatively dense without porous nanostructures.…”

Advances in designs and mechanisms of semiconducting metal oxide nanostructures for high-precision gas sensors operated at room temperature

“…Various SMONs have been designed and synthesized, such as nanorods, [71][72][73][74][75] nanoparticles, [76][77][78][79][80][81] nanowires, [82][83][84][85][86][87][88][89] nanospheres, 90 nanosheets, [91][92][93][94] nanotubes, [95][96][97][98] and mesoporous nanostructures. [99][100][101][102][103] The literature on SMON-based RT gas sensing is rich and the application area is very critical. New devices have been regularly introduced.…”

“…[109][110][111] (3) Poor reversibility has been reported for some of these sensors operated at RT. 101…”

Reversible Formation of g‐C3N4 3D Hydrogels through Ionic Liquid Activation: Gelation Behavior and Room‐Temperature Gas‐Sensing Properties

“…The solution processability of the 3D g‐C 3 N 4 hydrogel enables room‐temperature film deposition without further sintering. Compared with traditional gas sensors operating at high temperature (300–500 °C), the 3D g‐C 3 N 4 hydrogel gas sensor can operate at 20 °C with excellent sensitivity ( R a / R g = 9.89@50 ppm) and fast response kinetics (less than 10 s), being fully reversible without the need of ultraviolet radiation or high temperature . Thus, besides establishing the fundamental grounds for the stabilization of these gelated structures, we also demonstrate an alternative option for the development of easily miniaturized and integrated devices, enabling sensing performance with low power consumption.…”