The Effect of Band-Gap on TiO2 Thin Film Considering Various Parameters

  • Majedul Haque Mithun Department of Electrical and Electronic Engineering, Rajshahi University of Engineering and Technology, Rajshahi, Bangladesh
  • Abu Sayed Department of Electrical and Electronic Engineering, Rajshahi University of Engineering and Technology, Rajshahi, Bangladesh
  • Imteaz Rahaman Department of Electrical and Electronic Engineering, Rajshahi University of Engineering and Technology, Rajshahi, Bangladesh
Keywords: automatic sol-gel, optical properties, band-gap, TiO2


The aim of this work is to measure the effect of band-gap on TiO2 thin films by changing tetrabutylorthotitanate (TBOT), diethanolamine (DEA), and temperature. The sol-gel method is experimentally introduced to find out the better band-gap of TiO2 thin films by varying the concentration of TBOT (4 ml to 10 ml), DEA (2 ml to 5 ml), and temperature (350°C to 650°C). With the help of an ultraviolet-visible spectrophotometer for the wavelength of 300-900 nm, these thin films are characterized concerning optical properties (transmittance spectra, absorbance spectra, direct band-gap, and indirect band-gap). The direct and indirect band-gaps are found 3.38 eV and 3.25 eV respectively, which are close to or within the standard band-gap range of TiO2 (3.2 eV to 3.35 eV) and are found at 8 ml TBOT, 3 ml DEA, and a temperature of 550°C.


A. Velasco-Hernández, R. A. Esparza-Muñoz, F. J. de Moure-Flores, J. Santos-Cruz, and S. A. Mayén-Hernández, “Synthesis and Characterization of Graphene Oxide-TiO2 Thin Films by Sol-Gel for Photocatalytic Applications,” Materials Science in Semiconductor Processing, vol. 114, 105082, August 2020.

S. Salaeh, M. Kovacic, D. Kosir, H. Kusic, U. L. Stangar, D. D. Dionysiou, et al., “Reuse of TiO2-Based Catalyst for Solar Driven Water Treatment; Thermal and Chemical Reactivation,” Journal of Photochemistry and Photobiology A: Chemistry, vol. 333, pp. 117-129, January 2017.

T. Hasegawa, A. B. Beleke, and M. Mizuhata, “Membrane Modification by Liquid Phase Deposition Using Small Amount of TiO2 for High Temperature Operation of Polymer Electrolyte Fuel Cells,” Journal of Power Sources, vol. 233, pp. 148-156, July 2013.

D. Dambournet, I. Belharouak, and K. Amine, “Tailored Preparation Methods of TiO2 Anatase, Rutile, Brookite: Mechanism of Formation and Electrochemical Properties,” Chemistry of Materials, vol. 22, no. 3, pp. 1173-1179, February 2010.

Y. Liao, W. Que, Q. Jia, Y. He, J. Zhang, and P. Zhong, “Controllable Synthesis of Brookite/Anatase/Rutile TiO2 Nanocomposites and Single-Crystalline Rutile Nanorods Array,” Journal of Materials Chemistry, vol. 22, no. 16, pp. 7937-7944, April 2012.

T. Noguchi, A. Fujishima, P. Sawunyama, and K. Hashimoto, “Photocatalytic Degradation of Gaseous Formaldehyde Using TiO2 Film,” Environmental Science and Technology, vol. 32, no. 23, pp. 3831-3833, December 1998.

D. H. Kim, H. S. Hong, S. J. Kim, J. S. Song, and K. S. Lee, “Photocatalytic Behaviors and Structural Characterization of Nanocrystalline Fe-Doped TiO2 Synthesized by Mechanical Alloying,” Journal of Alloys and Compounds, vol. 375, no. 1-2, pp. 259-264, July 2004.

W. T. Chiou, W. Y. Wu, and J. M. Ting, “Growth of Single Crystal ZnO Nanowires Using Sputter Deposition,” Diamond and Related Materials, vol. 12, no. 10-11, pp. 1841-1844, October-November 2003.

W. G. Lee, S. I. Woo, J. C. Kim, S. H. Choi, and K. H. Oh, “Preparation and Properties of Amorphous TiO2 Thin Films by Plasma Enhanced Chemical Vapor Deposition,” Thin Solid Films, vol. 237, no. 1-2, pp. 105-111, January 1994.

M. Sreemany and S. Sen, “Influence of Calcination Ambient and Film Thickness on the Optical and Structural Properties of Sol-Gel TiO2 Thin Films,” Materials Research Bulletin, vol. 42, no. 1, pp. 177-189, January 2007.

P. R. Mishra, P. K. Shukla, A. K. Singh, and O. N. Srivastava, “Investigation and Optimization of Nanostructured TiO2 Photoelectrode in Regard to Hydrogen Production through Photoelectrochemical Process,” International Journal of Hydrogen Energy, vol. 28, no. 10, pp. 1089-1094, October 2003.

J. Jiu, S. Isoda, M. Adachi, and F. Wang, “Preparation of TiO2 Nanocrystalline with 3-5 nm and Application for Dye-Sensitized Solar Cell,” Journal of Photochemistry and Photobiology A: Chemistry, vol. 189, no. 2-3, pp. 314-321, June 2007.

F. Kara, M. Kurban, and B. Coşkun, “Evaluation of Electronic Transport and Optical Response of Two-Dimensional Fe-Doped TiO2 Thin Films for Photodetector Applications,” Optik, vol. 210, 164605, May 2020.

H. Kurban, M. Kurban, P. Sharma, and M. M. Dalkilic, “Predicting Atom Types of Anatase TiO2 Nanoparticles with Machine Learning,” Key Engineering Materials, vol. 880, pp. 89-94, 2021.

T. Zerrin, M. Kurban, M. M. Dickson, M. Ozkan, and C. S. Ozkan, “Suppression of the Shuttle Effect in Li-S Batteries via Magnetron Sputtered TiO2 Thin Film at the Electrode-Electrolyte Interface,” ACS Applied Energy Materials, vol. 3, no. 2, pp. 1515-1529, February 2020.

Y. Zhang and X. Xu, “Machine Learning Band Gaps of Doped-TiO2 Photocatalysts from Structural and Morphological Parameters,” ACS Omega, vol. 5, no. 25, pp. 15344-15352, June 2020.

A. Deyasi, P. Debnath, A. K. Datta, and S. Bhattacharyya, Photonics, Plasmonics, and Information Optics: Research and Technological Advances, Boca Raton: CRC Press, 2021.

S. N. K. Abad, N. N. Ilkhechi, M. Adel, and M. Mozammel, “Hierarchical Architecture of a Superhydrophobic Cd-Si Co-Doped TiO2 Thin Film,” Applied Surface Science, vol. 533, 147495, December 2020.

A. Amini, M. S. Zakerhamidi, and S. Khorram, “Changes of the TiO2 Thin Film Electro-Optical Properties in the Ar and N2 Glow Discharge Plasma Due to Effects of the Electric Field in Plasma’s Sheath,” Physica B: Condensed Matter, vol. 612, 412820, July 2021.

M. F. Hossain, S. Biswas, T. Takahashi, Y. Kubota, and A. Fujishima, “Effect of Structure and Surface Morphology of Sol-Gel Derived TiO2 Photoelectrode on the Performance of Dye-Sensitized Solar Cells,” Journal of Vacuum Science and Technology A: Vacuum, Surfaces, and Films, vol. 26, no. 4, pp. 1007-1011, July 2008.

G. Liu, C. Han, M. Pelaez, D. Zhu, S. Liao, V. Likodimos, et al., “Enhanced Visible Light Photocatalytic Activity of CN-Codoped TiO2 Films for the Degradation of Microcystin-LR,” Journal of Molecular Catalysis A: Chemical, vol. 372, pp. 58-65, June 2013.

A. Chen, W. F. Chen, T. Majidi, B. Pudadera, A. Atanacio, M. Manohar, et al., “Mo-Doped, Cr-Doped, and Mo-Cr Codoped TiO2 Thin-Film Photocatalysts by Comparative Sol-Gel Spin Coating and Ion Implantation,” International Journal of Hydrogen Energy, vol. 46, no. 24, pp. 12961-12980, April 2021.

How to Cite
Mithun, M. H., Sayed, A., & Rahaman, I. (2021). The Effect of Band-Gap on TiO2 Thin Film Considering Various Parameters. Proceedings of Engineering and Technology Innovation, 19, 45-52.