Enhancing acetone detection of In2O3-decorated MOF-derived Fe2O3 spindles with Pt nanoparticles functionalization

Design: sensing materials with core-shell structure is an excellent strategy to achieve high sensing performance toward acetone detection. Herein, MIL-88A(Fe) was fabricated via a hydrothermal route, which renders as a template to fabricate Fe2O3@In2O3 core-shell spindles structure. Gas sensing results show that the sensor based on Fe2O3@In2O3 exhibit enhanced response of 193–200 ppm acetone than that of 36 for pristine Fe2O3 at 200 °C. After Pt functionalization, the response of Fe2O3@In2O3/Pt to 200 ppm acetone is up to 839 at a reducing working temperature of 180 °C with a good selectivity and long-term stability. A synergistic mechanism originated from the intrinsic merits of Fe2O3 and In2O3, the 1D core-shell structure, the creation of heterojunction at the interface of Fe2O3 and In2O3 and the creation of Shottky junction at In2O3 and Pt nanoparticles, and the catalytic reaction of Pt holds accountable for the significant improvement in acetone sensing.