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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.58  No.3 (2017)  >  pp.465-470

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Effect of the Added Polyethylene Glycol Molecular Weight and Calcination Heating Rate on the Morphology of TiO2 Films Formed by Sol-Gel

Kumpon Leelaruedee1), Patama Visuttipitukul1), Niti Yongvanich2)
1) Department of Metallurgical Engineering, Chulalongkorn University 2) Department of Materials Science and Engineering, Silpakorn University

This research investigated the changing morphology of silicon (Si)-supported titanium dioxide (TiO2) thin films with different heating rates and molecular weights (MW) of the added polyethylene glycol (PEG). The TiO2 films were deposited on a Si wafer (100) by sol-gel spin coating with PEG (MW = 6,000 or 35,000 g·mol−1) as pore generating agents. Calcination at 450℃ completely decomposed all the organic residues in the TiO2 sol, and the resultant films were in the anatase phase. The combustion nature of PEG was found to be the main factor controlling the film's morphology, where the exothermic heat of PEG combustion tended to be higher with increased heating rates and dependent on the type of PEG (extended and folded chain crystal). At heating rates of 10℃·min−1 or higher, the exothermic heat led to localized grain coalescence in the TiO2 films, which decreased the film porosity. However, this exothermic heat also simultaneously induced pore agglomeration. Hence, the average pore size of PEG-containing films were larger than in films without PEG. In contrast, the heating rate did not significantly affect the morphology films without PEG.

poly-ethyleneglycol, titanium dioxide thin film, heating rate

Received: July 29, 2016
Accepted: December 26, 2016 , Published online: February 25, 2017



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