Fast detection of NO2 by porous SnO2 nanotoast sensor at low temperature

Ji Li; Ming Yang; Xiaoli Cheng; Xianfa Zhang; Chuanyu Guo; Yingming Xu; Shan Gao; Zoltán Major; Hui Zhao; Lihua Huo

doi:10.1016/j.jhazmat.2021.126414

Fast detection of NO₂ by porous SnO₂ nanotoast sensor at low temperature

J Hazard Mater. 2021 Oct 5:419:126414. doi: 10.1016/j.jhazmat.2021.126414. Epub 2021 Jun 17.

Authors

Ji Li¹, Ming Yang², Xiaoli Cheng¹, Xianfa Zhang¹, Chuanyu Guo¹, Yingming Xu³, Shan Gao⁴, Zoltán Major⁵, Hui Zhao¹, Lihua Huo⁶

Affiliations

¹ Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China.
² College of Science, Heihe College, Heihe 164300, China.
³ Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China. Electronic address: xuyingming@hlju.edu.cn.
⁴ Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China. Electronic address: shangao67@yahoo.com.
⁵ Institute of Polymer Product Engineering, Johannes Kepler University Linz, Linz, Austria.
⁶ Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China. Electronic address: huolihua@hlju.edu.cn.

PMID: 34182421
DOI: 10.1016/j.jhazmat.2021.126414

Abstract

In order to challenge high working temperature, low response and low selectivity of present NO₂ sensor, porous SnO₂ nanotoasts with a large surface area (79.94 m²/g) were synthesized. Thick film sensors fabricated by the SnO₂ nanotoasts exhibited a high response to NO₂ gas operating at room temperature. Excellent performance for NO₂ sensing gas at 50 °C, included the high response of 105.2 (10 ppm), low detection limitation of 0.1 ppm, fast response within 10 s, and wide range of 0.1-10 ppm (R² = 0.9931). These sensors also demonstrated perfect selectivity, moisture resistance and 90 days of long-term stability. SnO₂ nanotoasts sensor has excellent detection ability in actual detection. The superior response of porous SnO₂ nanotoasts towards NO₂ was attributed to the special porous structure with large specific surface area and oxygen vacancies in sensing material, which helped adsorption of the target gas molecules onto the sensing surfaces and transfer of the charge.

Keywords: Low temperature; NO(2) gas sensor; Oxygen vacancies; Porous structure; SnO(2) nanotoast.