Improved crystalline structure and H2S sensing performance of CuO–Au–SnO2 thin film using SiO2 additive concentration

Bi-functional mechanism of H2S detection using CuO–SnO2 nanowires

“…Hence, detecting trace concentrations of H 2 S is highly desirable at sites of oil and natural gas mining. As a result of the extensive exploration of materials which show outstanding capability for detecting H 2 S, 3,[14][15][16] CuO-SnO 2 hybrid materials have been recognized as one of the best material systems for H 2 S sensors. The exceptionally high H 2 S sensing performance observed in the CuO-SnO 2 hybrid materials is attributed to the creation and extinction of the p-n junctions built at the heterocontacts between p-CuO and n-SnO 2 in the presence and absence of H 2 S, respectively.…”

Synthesis and H2S sensing performance of MoO3/Fe2(MoO4)3 yolk/shell nanostructures

“…However, most of MOS materials had weak response towards H 2 S gas even at a high working temperature. Therefore, several approaches, including loading catalyst on the surface of MOS, [13][14][15][16][17] constructing MOS heteronanostructures, [18][19][20][21][22][23][24][25][26][27][28][29] and doping foreign element in MOS, [30][31][32][33][34] have been developed to improve H 2 S sensing performances of MOS materials. As for loading catalyst such as Au, Pt, and Pd on the surface of MOSs, the enhanced sensing mechanism was attributed to greater and faster degree of electron depletion of MOSs.…”

“…As for loading catalyst such as Au, Pt, and Pd on the surface of MOSs, the enhanced sensing mechanism was attributed to greater and faster degree of electron depletion of MOSs. [13][14][15][16][17] However, the introduction of these precious metals would lead to the increase in the costs for sensor fabrications. As for MOS heteronanostructures, their enhanced H 2 S sensing performance was related to the change in the heterojunction barrier as the MOSs are exposed to different gases as well as the synergetic effect from different MOS sensing materials.…”

Improvement of H2S Sensing Properties of SnO2-Based Thick Film Gas Sensors Promoted with MoO3 and NiO

“…Accordingly, there is increasing demand for sensing devices that monitor low H 2 S concentrations. Well-known materials used to detect H 2 S include BaTiO 3 [3], SnO 2 -Pd [4], Ag-SnO 2 [5], SnO 2 -Al 2 O 3 [6], SnO 2 -CuO [7–11], SnO 2 -CuO-SnO 2 [12,13], SnO 2 -ZnO-CuO [14] and SiO 2 -doped Cu-Au-SnO 2 [15]. Among the sensors described in the literature, CuO-modified thin-film or thick-film SnO 2 sensors are promising for the sensitive and selective detection of H 2 S [1].…”

“…SnO 2 -based thick film gas sensors can achieve greater sensitivity to H 2 S through control of the particle size [17] and the addition of suitable promoters [13,14]. Wagh et al reported that SnO 2 -ZnO-CuO thick-film sensors had significantly better response and recovery times than SnO 2 -ZnO or CuO doped SnO 2 sensors [15]. Nevertheless, most studies on the sensing behavior of CuO-modified SnO 2 thick-film gas sensors focused on concentrations of tens to hundreds of ppm.…”