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Title: Transparent TiO 2-PMMA nanohybrids of high nanocrystallinity and enhanced nonlinear optical properties
Authors: Yuwono, A.H. 
Xue, J. 
Wang, J. 
Elim, H.I. 
Wei, J.I. 
Keywords: Crystallinity
In situ sol-gel process
Nonlinear optical properties
TiO 2-PMMA nanohybrids
Water vapor treatment
Issue Date: Jun-2005
Citation: Yuwono, A.H., Xue, J., Wang, J., Elim, H.I., Wei, J.I. (2005-06). Transparent TiO 2-PMMA nanohybrids of high nanocrystallinity and enhanced nonlinear optical properties. Journal of Nonlinear Optical Physics and Materials 14 (2) : 281-297. ScholarBank@NUS Repository.
Abstract: Nanohybrid thin films of titania-polymethyl methacrylate (TiO 2-PMMA) with varying degrees of nanocrystallinity have been successfully synthesized via an in-situ sol gel-polymerization route, assisted by subsequent thermal and water vapor treatments. Posthydrothermal treatment by water vapor at relatively low temperatures led to a higher degree of crystallinity for TiO 2 nanoparticles than the conventional thermal annealing. The degree of TiO 2 crystallinity in the resulting nanohybrid films was studied by using XRD, FTIR, UV-Vis spectroscopies and HRTEM. The resulting nanohybrid thin films are highly transparent in the visible region, with an estimated band gap energies, E g, close to that of anatase TiO 2 (∼ 3.20eV). The nanocrystallinity level of TiO 2 phase strongly affects both linear and nonlinear optical properties of the nanohybrids. A significant enhancement in linear refractive index, n o, up to 1.780 and a third-order nonlinear optical susceptibility, χ (3) as high as 5.27 × 10 -9 esu, were demonstrated with the nanohybrid exhibiting the enhanced TiO 2 crystallinity and well-preserved PMMA matrix. © World Scientific Publishing Company.
Source Title: Journal of Nonlinear Optical Physics and Materials
ISSN: 02188635
DOI: 10.1142/S0218863505002712
Appears in Collections:Staff Publications

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