Humidity independent hydrogen sulfide sensing response achieved with monolayer film of CuO nanosheets

Jiansong Miao, Chuan Chen, Jerry Y.S. Lin

Research output: Contribution to journalArticle

Abstract

Detection of ppm and sub-ppm level airborne hydrogen sulfide (H2S) is critical to both environmental monitoring and medical diagnosis. However, conductometric gas sensors based on semiconducting metal oxides are usually susceptible to humidity interference, which limits their performance in those applications. Typically, the hydroxyl groups formed by the chemisorption of water vapor on the surfaces of metal oxides prevent any further redox reaction, and in turn, passivate the sensing material. Departing from the traditional strategy of alleviating humidity interference with moisture adsorbents, we propose to explore the possible surface reactions between H2S and hydroxyl groups on the surface of copper (II) oxide (CuO) in this work. With a monolayer film of CuO nanosheets, we observe an unprecedented humidity independent H2S sensing performance. In addition, the sensor also shows excellent sensitivity and selectivity to H2S and high stability in dry and wet conditions. The mechanism underlying the stable sensing response regardless of humidity variations is investigated with X-ray photoelectron spectroscopy.

Original languageEnglish (US)
Article number127785
JournalSensors and Actuators, B: Chemical
Volume309
DOIs
StatePublished - Apr 15 2020

Keywords

  • CuO nanosheet
  • Humidity independent
  • Hydrogen sulfide
  • Monolayer
  • Sensing mechanism

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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