Characterization study of silver titanium dioxide (AgTiO2) thin film deposited on various substrates via sol-gel technique

Md Radzai, Fatimah (2012) Characterization study of silver titanium dioxide (AgTiO2) thin film deposited on various substrates via sol-gel technique. Masters thesis, Universiti Teknikal Malaysia Melaka.

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Abstract

Anatase Titanium Dioxide (TiO2) sol was synthesized in room temperature 27°C and ambient pressure by hydrolysis of Titanium Tetraisopropoxide (TTiP) in acidic aqueous solution (Hydrochloric acid, HCl), ethanol and deionized water. Degussa P25 powder was used as a precursor to enhance the anatase presence in the crystalline phase, as Degussa P25 powder is comprised of anatase and rutile phase with the ratio of 70:30. At room temperature and in ambient atmosphere, crystalline TiO2 thin films were deposited on Acrylic Perxpex (AP), glass, stainless steel and ceramic from the as-prepared TiO2 sol by a dip-coating process. TiO2 layers on the substrate were thickened by consecutive coatings. Then the TiO2 coated substrates were finally dipped into pure nanosilver to ensure protection against microbial. Sintering was applied at different temperatures from 120 to 600 °C in order to enhance crystallization. AgTiO2 thin film is found to be in good adhesion to the substrates through means of ultrasonically immersed in water and sticky tape adhesion. Anatase crystallite size was calculated through full-width at half-maximum (FWHM) in the X-ray Diffraction (XRD) intensities of anatase (101) peak at 2θ = 25.3° using Scherrer equation. The increase in calcinations temperature is parallel with the increase of the crystallite size. The anatase/rutile percentage was calculated through anatase and rutile intensities, to show the coherent ratio relevant to the Degussa P25 powder presence. Field-emission type scanning electron microscope (FE-SEM) investigations revealed that the AgTiO2 thin films on each substrates were porous and uniform, while the average particle sizes of the nanoparticles composing the AgTiO2 thin films on different substrates are in range of 37~87 nm corresponding with the calculated particles achieved by the Scherrer equation. The AgTiO2 thin films exhibited smooth porous surface, anatase phase and increasing crystallite size with increasing calcinations temperature. These are the characteristics that are proned to achieve high photocatalytic conditions.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Titanium dioxide
Subjects:	T Technology > T Technology (General) T Technology > TJ Mechanical engineering and machinery
Divisions:	Library > Tesis > FKP
Depositing User:	FATIMAH MD. RADZAI
Date Deposited:	05 Mar 2013 06:55
Last Modified:	30 Aug 2024 15:18
URI:	http://eprints.utem.edu.my/id/eprint/6735
Statistic Details:	View Download Statistic

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