Nonlinear optical behavior of transparent nanohybrids of nanocrystalline TiO2 in poly(methyl methacrylate) prepared by in situ sol-gel polymerization technique

Akhmad Herman Yuwono, J. M. Xue, J. Wang, H. I. Elim, W. Ji, Y. Li, T. J. White

Research output: Contribution to journalArticlepeer-review

Abstract

Nanohybrid thin films consisting of nanocrystalline TiO2 particles in poly(methyl methacrylate) (PMMA) were successfully synthesized by in-situ sol-gel and polymerization assisted by spin coating. Using titanium isoproproxide (Ti-iP), methyl methacrylate (MMA) and 3-(trimethoxysily) propyl methacrylate (MSMA) as the starting materials, nanohybrids containing up to 60% Ti-iP in PMMA were realized. The resulting nanohybrid thin films coated on quartz substrates are optically transparent and demonstrate nonlinear optical behaviour, where their nonlinear absorption increases with the loading of Ti-iP in PMMA, as confirmed by Z-scan measurements. Using pump-probe technique, these thin films are shown to exhibit an ultrafast relaxation time of ∼ 1.5 picosecond.

Original languageEnglish
Pages (from-to)367-370
Number of pages4
JournalJournal of Metastable and Nanocrystalline Materials
Volume23
DOIs
Publication statusPublished - 1 Jan 2005

Keywords

  • Nonlinear Optical Behavior
  • Ultrafast Electronic Nonlinearity

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