Ionothermal synthesis of mesoporous SnO2 nanomaterials and their gas sensitivity depending on the reducing ability of toxic gases

Abstract

Mesoporous SnO2 with a high surface area of 292.7 m(2) g(-1) has been successfully synthesized via a low-cost NH4Cl-based ionothermal route. When evaluated as a gas sensor, impressive performances towards N2H4 and HCHO are achieved owing to its excellent chemical reactivity towards oxygen.

2-Methyl-2,4-pentanediol gas sensor properties of nano-SnO2 flat-type coplanar gas sensing arrays at low detection limit

“…The bond energy of H-NH 2 in ammonia (435 kJ/mol) is higher than the bond energy of H-CHO in formaldehyde (364 kJ/mol) [46]. Because of the bond energy, the response of the gas sensor arrays to ammonia is lower than that to formaldehyde which is similar to some reports [51,52].…”

“…The good selectivity can be well explained by an electron-liberate theory [49], the reducing ability of the test gas [50] (referring to the degree of difficulty of the receiving and losing electrons of the test gas in an oxidation-reduction reaction) and the bond energy of the test gas [51,52]. Since the operating temperature of the nano-SnO 2 flat-type coplanar gas sensor arrays is 400°C, O 2− is the dominating species of chemisorbed oxygen on the surface and grain boundaries [50,53].…”

Enhanced Sub-ppm NH3 Gas Sensing Performance of PANI/TiO2 Nanocomposites at Room Temperature

“…The addition of semiconducting metal oxides not only improves gas-sensing properties, but also avoids high operating temperatures. In recent years, SnO 2 , ZnO, TiO 2 , and In 2 O 3 have been chosen as the addition of polyaniline to prepare ammonia sensors, which can used at room temperature (Guo et al, 2013; Chen et al, 2015; Dai et al, 2016; Zhang et al, 2018). Most of the materials reported so far have been prepared by electrospinning, interfacial synthesis, or mechanical mixing (Talwar et al, 2014; Li et al, 2015; Nie et al, 2016).…”

Synthesis of highly sensitive disordered porous SnO2 aerogel composite material by the chemical deposition method: synergistic effect of a layer of CuO thin film

“…44 A series of porous SnO 2 semiconductor materials were widely used for gas sensors. 45 Guo et al 46 have also investigated the gas sensing performances of mesoporous SnO 2 towards toxic gases with a different reducing ability. The ordered periodical structures and large specic surface area allow for improved performances.…”