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Issue 5, 2012
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Well-aligned ZnO nanowires with excellent field emission and photocatalytic properties

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Abstract

Well-aligned ZnO nanowires (NWs) were successfully synthesized on Si(100) by the process of carbothermal reduction and vapor–liquid–solid method. Scanning electron microscopy and transmission electron microscopy results confirmed that ZnO NWs were single crystalline wurtzite structures and grew along the [0001] direction. The influences of substrate temperature and total pressure on the growth were discussed. The well-aligned ZnO NWs show good field emission properties, and the emitter constructed of pencil-like ZnO NWs exhibited a low turn-on field (3.82 V μm−1) and a high field enhancement factor (β = 2303). Finally, we demonstrated that the as-prepared ZnO NWs with small diameter on the substrate have good photocatalytic activity toward degradation of methylene blue. Using ZnO NWs with Au nanoparticles (NPs) would decrease the recombination rate of hole–electron pairs due to the great shift of the Fermi level to the conduction band. Hence, adding Au NPs was a promising method to enhance the photocatalytic performance of ZnO NWs. It is significant that photocatalyst fabricated by ZnO NWs can apply to the degradation of organic pollution, and solve the environmental issues.

Graphical abstract: Well-aligned ZnO nanowires with excellent field emission and photocatalytic properties

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Publication details

The article was received on 12 Jul 2011, accepted on 06 Sep 2011 and first published on 07 Oct 2011


Article type: Communication
DOI: 10.1039/C1NR10796H
Citation: Nanoscale, 2012,4, 1471-1475
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    Well-aligned ZnO nanowires with excellent field emission and photocatalytic properties

    F. Chu, C. Huang, C. Hsin, C. Wang, S. Yu, P. Yeh and W. Wu, Nanoscale, 2012, 4, 1471
    DOI: 10.1039/C1NR10796H

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