A novel multifunctional BVO-T1Y8 porous nanofibers for multi-selective gas sensing and real-time temperature monitoring

Authors：Wang, J. R.; Shen, L. F.; Yan, S.^*; Pun, E. Y. B.; Lin, H.^*

Source：Chemical Engineering Journal, 2022, 431: 134175.

DOI：10.1016/j.cej.2021.134175

• Inorganic nanofibers
• Gas sensing
• Multi-selectivity
• Non-contact temperature monitoring

High-sensitivity and multi-function are of paramount importance in the development of sensors. To this end, a new type of Tm3+, Yb3+ co-doped BiVO4 inorganic porous nanofibers is proposed, which realizes high sensitivity response to NO2 and methylbenzene, and provides real-time working temperature. The gas sensor can detect the operating temperature by the intensity ratio of the relative intensity bands of Tm3+ emission, which associated with two thermally coupled levels, i.e., F-3(2,3) & RARR; H-3(6)/H-3(4) & RARR; H-3(6) (690/796 nm) intensity ratio, and the maximum relative sensitivity is as high as 0.0237 K-1. While the temperature detection is realized, the addition of rare earth ions also greatly improves the gas sensing performance. More interestingly, the sensing material BVO-T1Y8 porous nanofibers have excellent selectivity and long-term stability, respectively to 3 ppm NO2 at 200?degrees C and 100 ppm methylbenzene at 340 degrees C, with the highest response reaching 5.7 and 4.2. In general, the high gas sensitivity and multi-selectivity nanofibers with real-time temperature monitoring performance provides a new attempt for the application of multi-functional sensing materials in processing industrial waste gas.

• Institution
  北京工业大学; 大连工业大学