A New Insight into Cross-Sensitivity to Humidity of SnO2 Sensor

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • He Zhu
  • Qiang Li
  • Qilong Gao
  • Jun Chen
  • Na Wang
  • Jinxia Deng
  • Xianran Xing

Detail(s)

Original languageEnglish
Article number1703974
Journal / PublicationSmall
Volume14
Issue number13
Publication statusPublished - 27 Mar 2018
Externally publishedYes

Abstract

The efficiency of gas sensors varies enormously from fundamental study to practical application. This big gap comes mainly from the complex and unpredictable effect of atmospheric environment, especially in humidity. Here, the cross-sensitivity to humidity of a SnO2 sensor from local structural and lattice evolutions is studied. The sensing response of ethanol is found to be efficiently activated by adsorbing trace of water but inhibited as humidity increases. By X-ray diffraction, pair distribution function of synchrotron and ab initio calculations, the independent effect of water and ethanol on lattice and local structure are clearly revealed, which elucidate the intricate sensing reactions. The formation of hydrogen bonds and repulsion of ethoxides play key roles in the structural distortions, and also in adsorption energies that are critical to the sensitive behavior. The results show the sensor performance coupled with local structural evolution, which provides a new insight into the controversial effects of humidity on SnO2 sensors.

Research Area(s)

  • ethanol sensors, humidity effect, local structures, nanosized SnO2, thermal expansion

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.

Citation Format(s)

A New Insight into Cross-Sensitivity to Humidity of SnO2 Sensor. / Zhu, He; Li, Qiang; Ren, Yang; Gao, Qilong; Chen, Jun; Wang, Na; Deng, Jinxia; Xing, Xianran.

In: Small, Vol. 14, No. 13, 1703974, 27.03.2018.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review