期刊
APPLIED SURFACE SCIENCE
卷 479, 期 -, 页码 1029-1038出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2019.02.099
关键词
Hierarchical LaFeO3 microsphere; Polyaniline; Nanocomposite; p-p Heterojunction; CO2 gas sensing
Here we report the utilization of p-p isotype heterojunctions for improving the CO2 gas sensing performance of polyaniline (Pani)/hierarchical mesoporous LaFeO3 (LFO) at room temperature and high humidity (similar to 90%). Our findings show that the partial protonated of Pani and different wt% of LFO have a significant effect on CO2 gas sensing. The Pani/LFO nanocomposite (PLFO) gas sensor with 10 wt% LFO exhibited 13.20 times higher gas sensitivity to 20,000 ppm of CO2 compared to pure Pani gas sensor. All of the sensors had a dynamic response to 5000, 10,000 and 20,000 ppm of CO2 gas at similar to 90% humidity. The good long-term stability after one year is observed for the sensor based on PLFO. Moreover, CO2 gas mechanism of the PLFO sensors were studied in details. The advantages of p-p heterojunctions could provide a new perspective for CO2 gas sensing applications.
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