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Influence of pH on ZnO nanocrystalline thin films prepared by sol–gel dip coating method
K Sivakumar V Senthil Kumar N Muthukumarasamy M Thambidurai T S Senthil
Volume 35 Issue 3 June 2012 pp 327-331
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https://www.ias.ac.in/article/fulltext/boms/035/03/0327-0331 -
Keywords
Sol–gel ;ZnO nanocrystalline thin films ;dip coating method. -
Abstract
ZnO nanocrystalline thin films have been prepared on glass substrates by sol–gel dip coating method. ZnO thin films have been coated at room temperature and at four different pH values of 4, 6, 8 and 10. The X-ray diffraction pattern showed that ZnO nanocrystalline thin films are of hexagonal structure and the grain size was found to be in the range of 25–45 nm. Scanning electron microscopic images show that the surface morphology improves with increase of pH values. TEM analysis reveals formation of ZnO nanocrystalline with an average grain size of 44 nm. The compositional analysis results show that Zn and O are present in the sample. Optical band studies show that the films are highly transparent and exhibit a direct bandgap. The bandgap has been found to lie in the range of 3.14–3.32 eV depending on pH suggesting the formation of ZnO nanocrystalline thin films.
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Author Affiliations
K Sivakumar1 2 V Senthil Kumar1 N Muthukumarasamy3 M Thambidurai3 T S Senthil4
- Department of Physics, Karpagam University, Coimbatore 641 021, India
- Department of Physics, Hindusthan College of Engineering and Technology, Coimbatore 641 032, India
- Department of Physics, Coimbatore Institute of Technology, Coimbatore 641 014, India
- Department of Physics, Erode Sengunthar Engineering College, Erode 638 057, India
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Dates
- Published
- June 2012
- Manuscript received
- 3 June 2011
- Manuscript revised
- 29 July 2011
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