Issue 19, 2013

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

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

Supplementary files

Article information

Article type
Paper
Submitted
23 Mud 2013
Accepted
23 Maw 2013
First published
25 Maw 2013

Nanoscale, 2013,5, 9238-9246

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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