CO2-sensing properties and mechanism of nano-SnO2 thick-film sensor

Ab initio thermodynamic study of the SnO2(110) surface in an O2 and NO environment: a fundamental understanding of the gas sensing mechanism for NO and NO2

“…In this case, the resonances of peaks appear around −6.4 eV, −7.5 eV and −1.4 eV for hybridizations between O br -2P states and NO-3σ, 1π, 2π * orbitals, respectively, as can be seen in Fig. 10 In the sensing mechanism of SnO 2 compared to other gas like CO and ethanol, it was described that CO adsorption on the surface causes the taking off the surface oxygen atoms like O br and thus reduction of the surface [12,43,44]. Unlike this, it is not easy for NO to desorb O br but only possible to take off one oxygen atom of O 2dm because of relatively weak reducibility of NO.…”

“…In particular, it is widely used as solid state chemical sensors to both oxidizing (e.g., CO 2 , NO 2 ) and reducing (CO, NO) gases [3][4][5][6][7][8][9][10][11][12]. In all these applications, the key for governing device functionality is the properties of SnO 2 surface or its interface with functional organic molecules.…”

Application of SnO2 Nanoparticles and Zeolites in Coal Mine Methane Sensors

“…We used the results of previous tests with different types of zeolites 14 to prepare pellets from commercial zeolite 13X (IQE, Spain). Pelletization was performed to make zeolite easier to handle in determining its efficiency as a possible CO 2 filter on CH 4 sensors to absorb carbon dioxide and water, which interfere in the signal of the device 15 . The pellets were prepared according to the procedure described by Rongsayamanont and Sopajaree 16 , by mixing zeolite 13X (Si/Al 1.25) with polyvinyl alcohol (PVA) (15% w/w) and bentonite (9% w/w) in triplicate.…”

Recent Advances of SnO2-Based Sensors for Detecting Fault Characteristic Gases Extracted From Power Transformer Oil

“…In particular, theoretical calculations indicated that CO 2 molecules cannot be adsorbed onto the stoichiometric SnO 2 (110) surface or SnO 2 (110) surface pre-adsorbed by ${\text{O}}_2^{-}$ and O − in dry air. However in wet air, CO 2 could react with O of pre-adsorbed OH − , bringing about the formation of carbonates containing (CO 3 ) 2− and the dissociation/movement of surface OH − groups, accompanying the release of electrons from CO 2 to the SnO 2 surface (Wang et al, 2016). …”

“…Thermal and electrical faults in oil-filled power transformers may produce typical fault characteristic gases including hydrogen H 2 (David et al, 2018), carbon monoxide CO (Joseph, 1980; Uddin et al, 2016; Zhou et al, 2018b), carbon dioxide CO 2 (2015; Dan et al, 2016; Iwata et al, 2017; Zhang et al, 2017), methane CH 4 (Sedghi et al, 2010), acetylene C 2 H 2 (Qi et al, 2008), ethylene C 2 H 4 , and ethane C 2 H 6 . These typical fault characteristic gases could be dissolved in transformer oil or accumulate as free gases if produced rapidly in large quantities.…”