Highly sensitive gas sensor based on SnO2 nanorings for detection of isopropanol

NiO decorated CeO2 nanostructures as room temperature isopropanol gas sensors

“…19 Some other researchers also tried to fabricate isopropanol sensor and achieved good response at high operating temperatures. [20][21][22] High operating temperature is the most undesirable quality of any gas sensor which leads to high power consumption, low life time and chance of ignition while dealing with combustible gases. 23 To get better sensing response at lower operating temperatures, many efforts have been adopted such as, elemental doping, surface modications, heterostructures, and adding noble metals on the sensor surfaces.…”

Effect of Unsaturated Sn Atoms on Gas-Sensing Property in Hydrogenated SnO2 Nanocrystals and Sensing Mechanism

“…It is well accepted that the resistance change of the metal oxide semiconductor based sensors like SnO 2 is based on the exchange of charges between the absorbed gaseous species and the surface of metal oxide sensing materials 20 – 22 , 44 , 47 , 48 . In order to understand the role of hydrogenation in the increase of response of SnO 2 nanocrystal sensor towards VOC, resistances of the four types of SnO 2 nanocrystal sensors in air and in ethanol vapors of different concentrations were measured, and the results are displayed in Fig.…”

“…On the other hand, SnO 2 is considered to be one of the best known gas-sensing materials due to its remarkable receptivity variation in gaseous environment and excellent chemical stability 19 – 22 . Over the past decades, with the development of nanoscience and nanotechnology, SnO 2 nanomaterials with controlled morphologies, including nanoring 20 , nanowires 23 , 24 , nanobelts 25 , nanotubes 26 , 27 , nanosheets 28 , hollow spheres 29 , 30 , flower-like structure 31 , 32 , nanopolyhedrons 33 , hierarchical nanoarchitectures 34 , 35 , octahedra 21 , 22 and porous nanospheres 36 have been employed to fabricate gas sensors for detection of inflammable and toxic gases and volatile organic compounds (VOC) to improve gas-sensing properties. It was found that sensitivity of the sensors based SnO 2 nanostructured materials is increased by exposing high-energy facets 21 , 22 and increasing surface area 26 , 31 , 36 .…”

Heating Method Effect on SnO Micro-Disks as NO2 Gas Sensor

“…Gas sensor devices based on chemo-resistive metal oxide semiconductors (MOSs), (Barsan and Weimar, 2001;Comini et al, 2002;Barsan et al, 2007;Lee, 2009;Wang et al, 2010;Jin et al, 2017) such as SnO 2 (Batzill and Diebold, 2005;Ren et al, 2015;Xu et al, 2015;Cheng et al, 2016;Kida et al, 2016;Li et al, 2016), ZnO (Xu et al, 2000;Wan et al, 2004;Li et al, 2017;Morandi et al, 2017), In 2 O 3 (Li et al, 2003;Zhang et al, 2004;Xiao et al, 2017), WO 3 (Li et al, 2004;Yang and Guo, 2017), and CuO (Kim and Lee, 2014), are widely used for the detection of toxic and explosive gases (NO 2 , CO, CH 4 , H 2 S, and H 2 ) as well as VOCs (C 3 H 6 O, and C 2 H 5 OH). The detection mechanism of these MOSs is based on the resistivity change after the interaction of the analyte gas with the surface of the material, either by direct (NO 2 ) or indirect (H 2 , CO, CH 4 ) mechanisms (Barsan and Weimar, 2001;Batzill and Diebold, 2005).…”