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Title: Controlling the crystallinity and nonlinear optical properties of transparent TiO2-PMMA nanohybrids
Authors: Yuwono, A.H. 
Liu, B. 
Xue, J. 
Wang, J. 
Elim, H.I. 
Ji, W. 
Li, Y.
White, T.J.
Issue Date: 21-Oct-2004
Citation: Yuwono, A.H., Liu, B., Xue, J., Wang, J., Elim, H.I., Ji, W., Li, Y., White, T.J. (2004-10-21). Controlling the crystallinity and nonlinear optical properties of transparent TiO2-PMMA nanohybrids. Journal of Materials Chemistry 14 (20) : 2978-2987. ScholarBank@NUS Repository.
Abstract: Titania-polymer nanohybrid thin films represent a new class of potential materials for optoelectronic applications. While most such nanohybrid thin films lack control in crystallinity, we report in this paper transparent nanohybrids of titania-polymethyl methacrylate (TiO2-PMMA) thin films having a remarkably enhanced nanocrystallinity. Post-treatments with water vapor at relatively low temperatures were applied on these thin films, following in situ sol-gel polymerization. They promoted rearrangement of flexible Ti-O-Ti bonds leading to enhanced crystallization of the TiO2 phase. The degree of TiO2 crystallinity in the resulting nanohybrid films was studied by using XRD, FTIR, UV-Vis spectroscopies and HRTEM. Both linear and nonlinear optical responses increase with the enhancement of TiO2 crystallinity in the nanohybrids. The highest two-photon absorption coefficient (β) and nonlinear refractive index (n2) were observed for the nanohybrid thin films with highest TiO2 crystallinity, as confirmed by open and closed aperture Z-scan techniques using 250 fs laser pulses at 800 nm, having a value of 2260 cm GW-1 and 6.2 × 10-1 cm2 GW-1, respectively.
Source Title: Journal of Materials Chemistry
ISSN: 09599428
DOI: 10.1039/b403530e
Appears in Collections:Staff Publications

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