期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 343, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2021.130126
关键词
Pd@ZIF-8; PdO; Triethylamine; In2O3
资金
- Doctoral Fund Project of Henan Polytechnic University [B202047]
- Innovative Scientists and Technicians Team of Henan Provincial High Education [21IRTSTHN016]
- National Natural Science Foundation of China [61903159]
- Natural Science Foundation of Jiangsu Province [BK20190617]
A new sensing platform of PdO-ZnO-In2O3 nanofibers was prepared using a unique catalyst loading method (Pd@ZIF-8), demonstrating enhanced triethylamine response, selectivity, and response/recover speed compared to pure In2O3 and ZnO-In2O3 nanofibers. The study showed that the ultra-small PdO catalysts and heterojunctions in the composite nanofibers contributed to their distinguished gas sensing performance, suggesting great potential for triethylamine detection and effective use of ZIF-8 template for designing sensitive materials.
New sensing platform of PdO-ZnO-In2O3 nanofibers were prepared by a distinctive catalyst loading method (Pd@ZIF-8). The results of TEM show that Pd nanoparticles is about 2 nm in Pd@ZIF-8 and XPS results demonstrate that it finally exists in the form of ultra-small PdO nanoparticles in composite nanofibers. Pure In2O3 and ZnO-In2O3 nanofibers were subjected to comparative gas-sensing investigation to verify the superiority of the PdO-ZnO-In2O3 nanofibers. The results suggest that sensors fabricated on PdO-ZnO-In2O3 nanofibers show enhanced triethylamine response (R-a/R-g = 386 to 100 ppm triethylamine), great selectivity and excellent response/recover speed (1 s/740 s) at 250 degrees C. Furthermore, the loading amount of PdO is 0.2 mol% which is lower than that of the traditional method. The distinguished triethylamine gas sensing performance of PdO-ZnO-In2O3 nanofibers could be mainly due to the maximizing the depletion effects of ultra-small PdO catalysts, and the heterojunctions between PdO (ZnO) and In2O3, This work not only proves that PdO-ZnO-In2O3 nanofibers have great potential for triethylamine detection, but also indicates that using ZIF-8 template to design high-performance sensitive materials is an effective method.
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