Porous CdSnO3 nanocubics synthesized under suitable pH value for targeted H2S detection

Selectivity is still a major problem in gas sensors. In this study, porous CdSnO3 nanocubes were synthesized using a simple water bath reaction combined with calcination. The structures and morphology of CdSnO3 were characterized and manifested their wide range pore size distribution. The gas sensing studies revealed that CdSnO3 exhibits a high response to H2S at the optimized operating temperature of 220 °C. The influence of synthesis strategy (pH value) on gas selectivity was also studied. The possible sensing mechanism and reasons for improved sensing properties of the CdSnO3 sample were discussed by X-ray photoelectron spectroscopy and the first-principles method.