Influence of Sol-Gel pH and Soaking Time on the Morphology, Phases and Grain Size of TiO2 Coating

Nur Dalilah Johari; Zulkifli Mohd Rosli; Jariah Mohd Juoi; Muharniza Azinita Musa

doi:10.4028/www.scientific.net/SSP.268.219

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HomeSolid State PhenomenaSolid State Phenomena Vol. 268Influence of Sol-Gel pH and Soaking Time on the...

Influence of Sol-Gel pH and Soaking Time on the Morphology, Phases and Grain Size of TiO₂Coating

Abstract:

Titanium oxide, (TiO₂), can exist in three distinct crystallographic phases known as anatase, rutile, and brookite. Brookite, however, is the least known TiO₂phases and usually exists as byproduct during synthesising rutile or anatase. Therefore, in this study, the influence of sol-gel pH and soaking time on surface morphology, phases and grain size of TiO₂coating were investigated in an attempt to develop brookite thin film. Titanium (IV) isopropoxide (TTiP) is used as precursor for preparing TiO₂ sols. Prior to heating, TiO₂ layers were deposited on a glass slide by dipping it five times into TiO₂ sols. The TiO₂ layers were then heated at 450°C and soaked for 1 and 3 hours to form TiO₂ coating. Analysis on the phases and grain size were carried out using X-ray diffraction (XRD). The TiO₂surface morphology was investigated using Scanning Electron Microscope (SEM). Results showed that brookite phase with grain size of 27.40 nm successfully deposited on glass slide from sols with pH¹². Conversely, the TiO₂coatings deposited from sols of pH¹ and pH⁷ are amorphous. The effect of soaking time on phases and grain size is insignificant but enhances coatings uniformity as the soaking time increased. Thus, it can be concluded that sol-gel pH affect TiO₂crystallinity and phases. Brookite film is develop only when the TiO₂ sols is in bases condition or at higher pH value.

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Periodical:

Solid State Phenomena (Volume 268)

Pages:

219-223

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.268.219

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Online since:

October 2017

Authors:

Nur Dalilah Johari, Zulkifli Mohd Rosli*, Jariah Mohd Juoi, Muharniza Azinita Musa

Keywords:

Brookite, pH, Sol-Gel Dipping, TiO₂ Coating, TTIP

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* - Corresponding Author

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