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A Green Approach to Reversibly Tuning the Optical Properties of Metal Oxides

Published online by Cambridge University Press:  12 June 2012

Szetsen Lee  and
Jr-Wei Peng
Szetsen Lee*
Affiliation:
Department of Chemistry and Center for Nano-technology, Chung Yuan Christian University, Jhongli, Taoyuan, 32023, Taiwan
Jr-Wei Peng
Affiliation:
Department of Chemistry and Center for Nano-technology, Chung Yuan Christian University, Jhongli, Taoyuan, 32023, Taiwan
*
*Corresponding author: slee@cycu.edu.tw
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Abstract

Metal oxide (MO) films (ZnO and CuO) were synthesized by hydrothermal methods and treated with hydrogen and oxygen plasmas. From uv-visible transmittance spectra, we have found that the optical band gaps of MO films blue-shifted with hydrogen plasma treatment, but red-shifted with oxygen plasma treatment. By alternating the treatment sequence of hydrogen and oxygen plasmas, the MO optical band gap values can be reversibly tuned with the tunable ranges as wide as 80 and 550 meV for ZnO and CuO, respectively. The mechanism for reversible tuning of optical property is proposed based on the results of optical emission, X-ray diffraction, and scanning electron microscopy characterization. Compared to conventional metal ion doping and high temperature annealing methods, the use of low-temperature hydrogen and oxygen plasmas is more environmentally friendly.

Keywords

environmentally benignhydrothermalnanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1443: Symposium R – Bandgap Engineering and Interfaces of Metal Oxides for Energy , 2012 , mrss12-1443-r06-01
Copyright
Copyright © Materials Research Society 2012

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References

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