Highly sensitive and selective detection of ppb-level NO2 using multi-shelled WO3 yolk-shell spheres

Jun Sik Kim, Ji Wook Yoon, Young Jun Hong, Yun Chan Kang, Faissal Abdel-Hady, A. A. Wazzan, Jong Heun Lee

    Research output: Contribution to journalArticlepeer-review

    85 Citations (Scopus)

    Abstract

    Triple-shelled, double-shelled, and dense WO3 spheres were prepared by ultrasonic spray pyrolysis and their NO2 gas sensing characteristics were investigated. Triple-shelled WO3 yolk-shell spheres showed an unprecedentedly high response (resistance ratio = 100-49.0) to 50 ppb NO2 at 100-200 °C with negligible cross-responses to 5 ppm acetone, CO, NH3, ethanol, and toluene, whereas dense WO3 spheres showed low NO2 response (8.9-3.1). The response and selectivity to NO2 were maintained in a highly humid (relative humidity 80%) atmosphere. The ultrahigh response and selectivity of triple-shelled WO3 spheres to several tens ppb levels NO2 was attributed to the enhanced gas accessibility of the yolk-shell morphology with thin and permeable multiple shells.

    Original languageEnglish
    Pages (from-to)561-569
    Number of pages9
    JournalSensors and Actuators, B: Chemical
    Volume229
    DOIs
    Publication statusPublished - 2016 Jun 28

    Bibliographical note

    Publisher Copyright:
    © 2016 Elsevier B.V. All rights reserved.

    Keywords

    • NO sensor
    • Oxide semiconductor
    • WO
    • Yolk-shell sphere

    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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