Surface Functionalized Sensors for Humidity-Independent Gas Detection

Fengdong Qu, Shendan Zhang, Chaozhu Huang, Xuyun Guo, Ye Zhu, Tiju Thomas, Haichuan Guo, J. Paul Attfield, Minghui Yang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

16 Citations (Scopus)

Abstract

Semiconducting metal oxides (SMOXs) are used widely for gas sensors. However, the effect of ambient humidity on the baseline and sensitivity of the chemiresistors is still a largely unsolved problem, reducing sensor accuracy and causing complications for sensor calibrations. Presented here is a general strategy to overcome water-sensitivity issues by coating SMOXs with a hydrophobic polymer separated by a metal–organic framework (MOF) layer that preserves the SMOX surface and serves a gas-selective function. Sensor devices using these nanoparticles display near-constant responses even when humidity is varied across a wide range [0–90 % relative humidity (RH)]. Furthermore, the sensor delivers notable performance below 20 % RH whereas other water-resistance strategies typically fail. Selectivity enhancement and humidity-independent sensitivity are concomitantly achieved using this approach. The reported tandem coating strategy is expected to be relevant for a wide range of SMOXs, leading to a new generation of gas sensors with excellent humidity-resistant performance.

Original languageEnglish
Pages (from-to)6561-6566
Number of pages6
JournalAngewandte Chemie - International Edition
Volume60
Issue number12
DOIs
Publication statusPublished - 15 Mar 2021

Keywords

  • hydrophobicity
  • metal oxides
  • metal–organic frameworks
  • nanoparticles
  • semiconductors
  • sensors

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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