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Issue 19, 2013
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Oxygen vacancy induced band gap narrowing of ZnO nanostructures by an electrochemically active biofilm

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Abstract

Band gap narrowing is important and advantageous for potential visible light photocatalytic applications involving metal oxide nanostructures. This paper reports a simple biogenic approach for the promotion of oxygen vacancies in pure zinc oxide (p-ZnO) nanostructures using an electrochemically active biofilm (EAB), which is different from traditional techniques for narrowing the band gap of nanomaterials. The novel protocol improved the visible photocatalytic activity of modified ZnO (m-ZnO) nanostructures through the promotion of oxygen vacancies, which resulted in band gap narrowing of the ZnO nanostructure (Eg = 3.05 eV) without dopants. X-ray diffraction, UV-visible diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy, Raman spectroscopy, photoluminescence spectroscopy and high resolution transmission electron microscopy confirmed the oxygen vacancy and band gap narrowing of m-ZnO. m-ZnO enhanced the visible light catalytic activity for the degradation of different classes of dyes and 4-nitrophenol compared to p-ZnO, which confirmed the band gap narrowing because of oxygen defects. This study shed light on the modification of metal oxide nanostructures by EAB with a controlled band structure.

Graphical abstract: Oxygen vacancy induced band gap narrowing of ZnO nanostructures by an electrochemically active biofilm

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Publication details

The article was received on 23 May 2013, accepted on 23 Jul 2013 and first published on 25 Jul 2013


Article type: Paper
DOI: 10.1039/C3NR02678G
Citation: Nanoscale, 2013,5, 9238-9246
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    Oxygen vacancy induced band gap narrowing of ZnO nanostructures by an electrochemically active biofilm

    S. A. Ansari, M. M. Khan, S. Kalathil, A. Nisar, J. Lee and M. H. Cho, Nanoscale, 2013, 5, 9238
    DOI: 10.1039/C3NR02678G

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