Transparent TiO2-PMMA nanohybrids of high nanocrystallinity and enhanced nonlinear optical properties

Akhmad Herman Yuwono, Junmin Xue, John Wang, Hendry Izaac Elim, J. I. Wei

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


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 TiO2 nanoparticles than the conventional thermal annealing. The degree of TiO2 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, Eg, close to that of anatase TiO2 (∼ 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, no, 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 TiO2 crystallinity and well-preserved PMMA matrix.

Original languageEnglish
Pages (from-to)281-297
Number of pages17
JournalJournal of Nonlinear Optical Physics and Materials
Issue number2
Publication statusPublished - Jun 2005


  • Crystallinity
  • In situ sol-gel process
  • Nonlinear optical properties
  • Water vapor treatment


Dive into the research topics of 'Transparent TiO2-PMMA nanohybrids of high nanocrystallinity and enhanced nonlinear optical properties'. Together they form a unique fingerprint.

Cite this