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Microwave-assisted sol-gel synthesis and optical property of TiO2 thin film

HUAMING YANG1,* , XIANGCHAO ZHANG1, QIUFEN TAO1, AIDONG TANG2

Affiliation

  1. Department of Inorganic Materials, School of Resources Processing and Bioengineering, Central South University, Changsha 410083, China
  2. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China

Abstract

Titanium dioxide (TiO2) thin film has been successfully synthesized deposited on glass substrates by the sol–gel dip-coating method using microwave heating. The precursor and TiO2 film were characterized using thermogravimetric and differential scanning calorimetric (TG-DSC), X-ray diffraction (XRD), atomic force microscopy (AFM) and UV-visible (UV-vis) absorption spectra analysis technology. The preparation of the precursor sols and TiO2 film were described in detail. The XRD result demonstrates that the TiO2 film is well crystallized and consists of anatase phase only with (101) plane. The morphology of the nanoparticles of TiO2 thin film is spherical shape with grain size of 68.2 nm in average diameter and the surface of the TiO2 film is smooth. There is a strong wide UV absorption band around 387 nm for the prepared TiO2 film. The calculated band gap (Eg) value of the TiO2 thin film by microwave heating is about 3.4 eV for direct transition and about 3.2 eV for indirect transition, respectively. The microwave heating offers a novel process route in treating thin film for commercial applications..

Keywords

Titanium dioxide (TiO2), Thin films, Microwave heating, Optical property.

Submitted at: May 23, 2007
Accepted at: Aug. 18, 2007

Citation

HUAMING YANG, XIANGCHAO ZHANG, QIUFEN TAO, AIDONG TANG, Microwave-assisted sol-gel synthesis and optical property of TiO2 thin film, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 8, pp. 2493-2497 (2007)