Band gap energies of solar micro/meso-porous composites of zinc (hydr)oxide with graphite oxides

The band gap energies of micro/meso-porous zinc (hydr)oxide and its composites with 2 wt. % and 5 wt. % graphite oxides are reported using three optical characterization techniques. The obtained energy gaps (from 2.84 eV to 2.95 eV) of the composites are smaller than that for zinc oxide (∼3.2 eV) an...

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Bibliographic Details
Published in:Journal of applied physics 2013-07, Vol.114 (4)
Main Authors: Islam, SM Z., Gayen, Taposh, Seredych, Mykola, Mabayoje, Oluwaniyi, Shi, Lingyan, Bandosz, Teresa J., Alfano, Robert R.
Format: Article
Language:English
Subjects:
Carbon
Energy gap
Graphene
Graphite
Microscopy
Oxides
Scanning electron microscopy
Zinc
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Summary:The band gap energies of micro/meso-porous zinc (hydr)oxide and its composites with 2 wt. % and 5 wt. % graphite oxides are reported using three optical characterization techniques. The obtained energy gaps (from 2.84 eV to 2.95 eV) of the composites are smaller than that for zinc oxide (∼3.2 eV) and zinc (hydr)oxide (∼3.06 eV). The band gap narrowing of the composite materials is due to the presence of defects, larger particle size, and weaker confinement. The bonds between zinc (hydr)oxide lattice and the carbon of graphene phase also contribute to this phenomenon. The structural properties of these materials are presented using Transmission Electron Microscopy, Scanning Tunneling Electron Microscopy, X-Ray analysis, and Two-Photon Fluorescence imaging Microscopy.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4816779