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

Title
Oxygen vacancy induced band gap narrowing of ZnO nanostructures by an electrochemically active biofilm
Author(s)
조무환이진태사지드안자리칸모하마드만숩샤피어칼라틸[샤피어칼라틸]앰브린니사르[앰브린니사르]
Keywords
MICROBIAL FUEL-CELLS; DOPED ZNO; PHOTOCATALYTIC ACTIVITY; SUBSTRATE-TEMPERATURE; HYDROGEN-PRODUCTION; GOLD NANOPARTICLES; TIO2 NANOCRYSTALS; WASTE-WATER; PHOTOLUMINESCENCE; DEFECT
Issue Date
201310
Publisher
ROYAL SOC CHEMISTRY
Citation
NANOSCALE, v.5, no.19, pp.9238 - 9246
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 (E-g = 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.
URI
http://hdl.handle.net/YU.REPOSITORY/28813http://dx.doi.org/10.1039/c3nr02678g
ISSN
2040-3364
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공과대학 > 화학공학부 > Articles
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