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 Fe 2 O 3 @In 2 O 3 core-shell spindles structure. Gas sensing results show that the sensor based on Fe 2 O 3 @In 2 O 3 exhibit enhanced response of 193–200 ppm acetone than that of 36 for pristine Fe 2 O 3 at 200 °C. After Pt functionalization, the response of Fe 2 O 3 @In 2 O 3 /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 Fe 2 O 3 and In 2 O 3 , the 1D core-shell structure, the creation of heterojunction at the interface of Fe 2 O 3 and In 2 O 3 and the creation of Shottky junction at In 2 O 3 and Pt nanoparticles, and the catalytic reaction of Pt holds accountable for the significant improvement in acetone sensing.