Optical Studies on the Effect of Different Layers of TiO₂ Seeded-Template to the Growth of Nanostructured ZnO

Abstract:

In this study, Zinc oxide (ZnO) nanostructures have been fabricated on glass substrates coated with Titanium dioxide (TiO₂) of different layers, which act as seeded-template, by a solution-immersion method. The substrates were coated with TiO₂ by using sol-gel spin coating at five different layers of TiO₂: 1, 3, 5, 7 and 9. The effects of the layers to the growth of ZnO nanostructures were observed by using Ultraviolet-Visible (UV-Vis) spectroscopy, Raman spectroscopy and Photoluminescence (PL) spectroscopy. UV-vis spectra of films display the increasing of absorbance properties at visible region as the TiO₂ layers increase, as well as at UV region. Meanwhile, at visible region the transparency of TiO₂: ZnO films reduce as the layers of TiO₂ increase from 1 layer to 9 layers. Raman analysis shows the presence of ZnO in all the TiO₂ seeded-templates. From the result, it is confirmed the existence of mixed crystalline structure of both materials in these TiO₂: ZnO thin films and PL spectra of the films show seeded TiO₂ thin films has lower intensity of visible emission and high ratio of I_UV/I_VIS compared to the non-seeded TiO₂ This contributes to the lower structural defects, oxygen vacancies, impurities and has the most improved optical properties.

• Periodical: Advanced Materials Research (Volume 1109)
• Pages: 587-592
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1109.587
• Online since: June 2015
• Authors: N.A.M. Asib*, Aadila Aziz, Nurul Afaah Abdullah, M. Rusop, Zuraida Khusaimi
• Keywords: Layers, Nanostructured Zinc Oxide (ZnO), Optical Studies, Titanium Dioxide (TiO₂) Seeded-Template

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