Please use this identifier to cite or link to this item:
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

Show full item record
Files in This Item:
There are no files associated with this item.


checked on May 7, 2021


checked on May 7, 2021

Page view(s)

checked on May 3, 2021

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.