Highly Selective Detection of Benzene and Discrimination of Volatile Aromatic Compounds Using Oxide Chemiresistors with Tunable Rh-TiO2 Catalytic Overlayers

Young Kook Moon, Seong Yong Jeong, Young Moo Jo, Yong Kun Jo, Yun Chan Kang, Jong Heun Lee

    Research output: Contribution to journalArticlepeer-review

    76 Citations (Scopus)

    Abstract

    Volatile aromatic compounds are major air pollutants, and their health impacts should be assessed accurately based on the concentration and composition of gas mixtures. Herein, novel bilayer sensors consisting of a SnO2 sensing layer and three different xRh-TiO2 catalytic overlayers (x = 0.5, 1, and 2 wt%) are designed for the new functionalities such as the selective detection, discrimination, and analysis of benzene, toluene, and p-xylene. The 2Rh-TiO2/SnO2 bilayer sensor shows a high selectivity and response toward ppm- and sub-ppm-levels of benzene over a wide range of sensing temperatures (325–425 °C). An array of 0.5Rh-, 1Rh-, and 2Rh-TiO2/SnO2 sensors exhibits discrimination and composition analyses of aromatic compounds. The conversion of gases into more active species at moderate catalytic activation and the complete oxidation of gases into non-reactive forms by excessive catalytic promotion are proposed as the reasons behind the enhancement and suppression of analyte gases, respectively. Analysis using proton transfer reaction-quadrupole mass spectrometer (PTR-QMS) is performed to verify the above proposals. Although the sensing characteristics exhibit mild moisture interference, bilayer sensors with systematic and tailored control of gas selectivity and response provide new pathways for monitoring aromatic air pollutants and evaluating their health impacts.

    Original languageEnglish
    Article number2004078
    JournalAdvanced Science
    Volume8
    Issue number6
    DOIs
    Publication statusPublished - 2021 Mar 17

    Bibliographical note

    Publisher Copyright:
    © 2021 The Authors. Advanced Science published by Wiley-VCH GmbH

    Keywords

    • Rh-TiO
    • benzene
    • bilayer sensor
    • gas sensors
    • volatile aromatic compounds

    ASJC Scopus subject areas

    • Medicine (miscellaneous)
    • General Chemical Engineering
    • Biochemistry, Genetics and Molecular Biology (miscellaneous)
    • General Materials Science
    • General Engineering
    • General Physics and Astronomy

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