Nano Archive

Nano-phase titanium dioxide thin film deposited by repetitive plasma focus: Ion irradiation and annealing based phase transformation and agglomeration

Rawat, R. S. and Aggarwal, V. and Hassan, M and Lee, P. and Springham, S. V. and Tan, T. L. and Lee, S. (2008) Nano-phase titanium dioxide thin film deposited by repetitive plasma focus: Ion irradiation and annealing based phase transformation and agglomeration. APPLIED SURFACE SCIENCE , 255 (5). pp. 2632-2941. ISSN 0169-4332

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Abstract

We report the successful deposition of nano-phase crystalline titanium dioxide (TiO2) thin films using a repetitive plasma focus device on silicon (Si) substrates at room temperature. The plasma focus device, fitted with solid titanium anode was operated with argon-oxygen admixture as the filling gas. X-ray diffraction (XRD) patterns of as-deposited films confirm the deposition of crystalline TiO2 thin films having polymorphism nature; anatase and rutile, and their relative phase transition and crystallinity improvement by increasing the number of ion irradiation shots and/or annealing temperature. The crystallite sizes of the TiO2 particulates estimated from the typical diffraction peaks are found to be approximately 8 nm and 13 nm. The weight ratios of anatase and rutile in the TiO2 were estimated and it was revealed that anatase weight fraction was reduced by increasing the total ion irradiation and/or annealing temperature, owing to phase the transformation from anatase to rutile. Raman studies have also established the dominant presence of E-g and A(1g) Raman active modes of the rultile phase. Scanning electron micrographs (SEM) of the as-deposited films reveal uniformly distributed nano-phase morphology over the film surface. Agglomeration of smaller TiO2 nano-sized grains, to form bigger sized particulates, is seen to occur owing to the clustering of charged nucleates in the gas phase. The agglomeration is enhanced by increasing the number of ion irradiation shots and/or annealing temperature. (C) 2008 Elsevier B.V. All rights reserved.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:7731
Deposited By:JNCASR
Deposited On:16 Nov 2009 09:40
Last Modified:16 Nov 2009 09:40

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