Mechanism of gas sensitivity change with time of SnO2 gas sensors

Undoped and 0.1wt.% Ca-doped Pt-catalyzed SnO2 sensors for CH4 detection

“…A hydrothermal treatment of tin oxide gel with an ammonia solution can also be effective in stabilizing tin oxide particles [6]. Matsuura et al [7,8] have suggested that long-term stability of sintered SnO 2 gas sensors is greatly improved by addition of rhenium and vanadium. The Re/V-doped sensors exhibited little contamination drift of sensor resistance in hydrogen, originating from little change in oxidation reactivity.…”

Preparation and characterization of SnO2 and Cu-doped SnO2 thin films using electrostatic spray deposition (ESD)

“…5 Over the time, tin (IV) oxide (SnO 2 ) proved to be the most widely used semiconductor oxide gas sensor which can detect a wide range of pollutant gases. [6][7][8][9][10] The sensing mechanism of tin (IV) oxide, being an n-type semiconductor, is based on resistance changes if it is exposed to oxidizing or reducing gases. A major drawback of SnO 2 and metal oxide-based gas sensors is the lack of selectivity, which limits its further applications when each gas must be detected in a mixture of gases.…”

Distinction of gases with a semiconductor sensor under a cyclic temperature modulation with second-harmonic heating

“…A SnO 2 gas sensor was used as the semiconductor gas sensor (TGS2620, Figaro Engineering Inc., Osaka, Japan) [1,2,[27][28][29][30][31]. The conductance of the gas sensor was measured with a digital multimeter (Yokogawa, Model 7552, Japan), and successively stored in a personal computer via a GPIB interface.…”