Meso- and macroporous Co3O4 nanorods for effective VOC gas sensors

Hoa Nguyen, Sherif A. El-Safty

    Research output: Contribution to journalArticle

    191 Citations (Scopus)

    Abstract

    The synthesis of crystalline nanorod metal oxides with porous structure is an important issue in gas sensor technology, which aims to increase their sensitivity and stability. In addition, the development of a facile method to synthesize large yields of nanorods is a key factor in reducing the cost of products in thick film gas sensor technology. Large yields of crystalline meso-/macroporous Co3O4 nanorods are fabricated using facile hydrothermal method from CoCl2 and urea precursors, without using any surfactants or template-directing agents. The gas-sensing properties of synthesized nanorods are tested to volatile organic compounds (VOCs) such as benzene, acetone, and ethanol. Results reveal that crystalline meso- and macroporous Co3O4 nanorods have the highest sensitivity to acetone with a fast response and a recovery time of one minute. Moreover, the sensing properties of crystalline meso-/macroporous Co3O4 nanorods depend strongly on carrier (reference) gases, whereas preadsorbed oxygen plays an important role in the sensing mechanism of Co3O 4-based nanorod sensors for VOCs.

    Original languageEnglish
    Pages (from-to)8466-8474
    Number of pages9
    JournalJournal of Physical Chemistry C
    Volume115
    Issue number17
    DOIs
    Publication statusPublished - 2011 May 5

    Fingerprint

    Volatile Organic Compounds
    volatile organic compounds
    Chemical sensors
    Nanorods
    Volatile organic compounds
    nanorods
    sensors
    gases
    Crystalline materials
    Acetone
    acetone
    Gases
    sensitivity
    Benzene
    ureas
    Thick films
    Surface-Active Agents
    Urea
    Oxides
    thick films

    ASJC Scopus subject areas

    • Physical and Theoretical Chemistry
    • Electronic, Optical and Magnetic Materials
    • Surfaces, Coatings and Films
    • Energy(all)

    Cite this

    Meso- and macroporous Co3O4 nanorods for effective VOC gas sensors. / Nguyen, Hoa; El-Safty, Sherif A.

    In: Journal of Physical Chemistry C, Vol. 115, No. 17, 05.05.2011, p. 8466-8474.

    Research output: Contribution to journalArticle

    Nguyen, Hoa ; El-Safty, Sherif A. / Meso- and macroporous Co3O4 nanorods for effective VOC gas sensors. In: Journal of Physical Chemistry C. 2011 ; Vol. 115, No. 17. pp. 8466-8474.
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