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

8 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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