Ethanol sensor built on a SnO2/In2O3 composite generated from MOF

This paper, presents the synthesis of SnO2/In2O3 heterojunctions using a hydrothermal method, utilizing a metal-organic framework (MOF) as a sacrificial template, for the purpose of ethanol detection. Various characterization techniques were employed to analyze the structural features of the synthesized samples. To accurately evaluate the gas sensing superiority of MOF-formed heterojunctions, an extensive investigation was conducted on the ethanol gas sensing capabilities of SnO2-CTAB, SnO2, In2O3, SnO2/In2O3-CTAB, and SnO2/In2O3 sensors. The results demonstrate that the SnO2/In2O3 composite, compared to individual metal oxides, exhibits enhanced efficiency in detecting ethanol. At a temperature of 200 ℃, the response of 300 ppm ethanol was 78.05 with good repeatability, stability, and selectivity. This improvement may be due to the formation of heterojunctions between the two distinct metal oxides. Therefore, the rational design of SnO2/In2O3 heterojunctions, facilitated by the utilization of dual MOFs as templates, introduces a novel approach and strategy for optimizing gas sensors targeting ethanol species.