Vapor-phase growth of urchin-like Mg-doped ZnO nanowire networks and their application to highly sensitive and selective detection of ethanol

Chang Hoon Kwak, Hyung Sik Woo, Faissal Abdel-Hady, A. A. Wazzan, Jong Heun Lee

    Research output: Contribution to journalArticlepeer-review

    49 Citations (Scopus)

    Abstract

    Urchin-like Mg-doped ZnO nanowire networks were prepared by MgO-seeded vapor-phase growth of ZnO nanowires, and their potential as gas-sensing materials was investigated. The response (resistance ratio) of the urchin-like Mg-doped ZnO nanowire networks to 5 ppm C2H5OH at 350 °C was as high as 343, which is significantly higher than that of pure ZnO nanowire networks (7.0). In addition, the Mg-doped ZnO nanowire network sensors showed excellent selectivity to C2H5OH and an unprecedentedly high response (28.8) even to 0.25 ppm C2H5OH. The enhancement of the gas response and selectivity to C2H5OH was attributed to Mg-doping-induced decrease of the charge carrier concentration, the change of nanowire thickness/morphology, and the catalytic promotion of the C2H5OH sensing reaction.

    Original languageEnglish
    Pages (from-to)527-534
    Number of pages8
    JournalSensors and Actuators, B: Chemical
    Volume223
    DOIs
    Publication statusPublished - 2016 Feb 1

    Bibliographical note

    Funding Information:
    This work is supported by the Deanship of Scientific Research (DSR), King Abdulaziz University (KAU), under grant No. 2-135-36-HiCi , and a National Research Foundation of Korea (NRF) grant funded by the Korea Government (MEST) (No. 2013R1A2A1A01006545 ). The authors, therefore, acknowledge the technical and financial support of KAU and MEST.

    Publisher Copyright:
    © 2015 Elsevier B.V. All rights reserved.

    Keywords

    • Gas response
    • Gas sensor
    • Mg-doped ZnO
    • Oxide nanowire network
    • Selectivity

    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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