Molybdenum trioxide nanopaper as a dual gas sensor for detecting trimethylamine and hydrogen sulfide

Hua Yao Li, Liang Huang, Xiao Xue Wang, Chul Soon Lee, Ji Wook Yoon, Jun Zhou, Xin Guo, Jong Heun Lee

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21 Citations (Scopus)

Abstract

A free-standing, flexible, and semi-transparent MoO3 nanopaper was fabricated using ultralong MoO3 nanobelts (length ∼ 200 μm; width 200-400 nm), and its gas-sensing characteristics were investigated. The sensor exhibited high responses (resistance ratio) of 49 to 5 parts per million (ppm) hydrogen sulfide (H2S) at 250 °C and 121 to 5 ppm trimethylamine (TMA) at 325 °C with excellent gas selectivity, demonstrating its dual function for gas detection. Moreover, the sensor showed promising potential for the all-in-one detection of three representative offensive odors (TMA, H2S, and NH3) simply by tuning of the sensing temperature. This particular performance is attributed to the high chemical affinity of MoO3 to H2S and the acid-base interaction between basic TMA/NH3 and acidic MoO3. The mechanism underlying the control of gas selectivity by modulating the sensor temperature was investigated by Diffuse Reflectance Infrared Fourier Transform (DRIFT) measurements.

Original languageEnglish
Pages (from-to)3680-3685
Number of pages6
JournalRSC Advances
Volume7
Issue number7
DOIs
Publication statusPublished - 2017

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ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Li, H. Y., Huang, L., Wang, X. X., Lee, C. S., Yoon, J. W., Zhou, J., Guo, X., & Lee, J. H. (2017). Molybdenum trioxide nanopaper as a dual gas sensor for detecting trimethylamine and hydrogen sulfide. RSC Advances, 7(7), 3680-3685. https://doi.org/10.1039/C6RA26280E