Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7138835 | Sensors and Actuators B: Chemical | 2018 | 39 Pages |
Abstract
Ultra-small Pt nanoparticles functionalized In2O3 nanofibers have been designed by using a new catalyst loading platform (Pt@ZIF-8), which involves three steps including the synthesis of ZIF-8 nanoparticles, the preparation of Pt@ZIF-8 and the subsequent transformation to Pt-ZnO-In2O3 composite nanofibers by electrospinning. The experimental results demonstrate that the average sizes of Pt nanoparticles obtained in this way are only â¼3â¯nm, which is helpful to obtain highly sensitive gas sensors due to the ultra-small Pt nanoparticles. Gas sensing investigations indicate that the sensor based on Pt-ZnO-In2O3 nanofibers exhibit the superior acetone response (Ra/Rgâ¯=â¯57.1 to 100â¯ppm at 300â¯Â°C), ultra-fast response and recovery time (1/44s) and low detection limit (0.5â¯ppm). In this study, the excellent acetone gas sensing property of Pt-ZnO-In2O3 nanofibers attributes to the chemical sensitization and electrical sensitization of the ultra-small Pt nanoparticles, the n-n heterojunctions between ZnO and In2O3, and the p-n heterojunction produced between p-type PtO2 and n-type In2O3 (ZnO).
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Lanlan Guo, Fang Chen, Ning Xie, Xueying Kou, Chong Wang, Yanfeng Sun, Fangmeng Liu, Xishuang Liang, Yuan Gao, Xu Yan, Tong Zhang, Geyu Lu,