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1 Materials Science Poland

1 2023

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Regulation of N-type In2O3 Content on the Conductivity Typeof Co3O4 Based Acetone Sensor

Fu Lijuan, Fan Shuxing, Wang Zhao, Tang Wei

Materials Science Poland

2023

Vol. 41, No. 1

202--213

A double-jet electrospinning method was adopted to fabricate In2O3/Co3O4 nanofibers (NFs). The sensitivity of In2O3/Co3O4NFs and In2O3NFs were compared and analyzed, and the morphology, structure, chemical composition, and gas-sensing properties of the samples were comprehensively characterized. The results show that the introduction of Co3O4can improve the response of In2O3/Co3O4to acetone, to 29.52 (In2O3/Co3O4) and 12.34 (In2O3) to 200 ppm acetone at 2000°C, respectively. In addition, the doping of Co3O4was found to reduce the optimum working temperature of pure In2O3 from 275°C to 200°C. The composite of Co3O4and In2O3not only enhances the sensing performance, but also leads to a conversion of p-n conductivity type. The phenomenon of the p-n transition is relevant to operating temperature and proportion of In2O3and Co3O4. While the enhanced acetone sensing properties of In2O3/Co3O4NFs may be attributed to the p-n hetero-junction between n-type In2O3 and p-type Co3O4 crystalline grains, which promotes the electron migration. The synergistic effects between In2O3and Co3O4and the large specific surface area of NFs additionally contribute to the improvements of acetone sensing performance.