Molecular orientation of nonlinear optical polymer nanosheets on silica nanoparticle monolayer studied by optical waveguide spectroscopy

Miki Ishifuji, Takeo Suzuki, Masaya Mitsuishi, Tokuji Miyashita

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The paper describes molecular orientation of nonlinear optical (NLO) polymer monolayer transferred onto a sphere-shaped silica nanoparticle monolayer using optical waveguide spectroscopy. Structurally well-defined hybrid polymer nanoassemblies were constructed through bottom-up approaches: Langmuir-Blodgett technique and immersion method. Silica nanoparticles (SiO2 NPs, 40-50 nm diameter) were immobilized on a quartz waveguide using cationic polymer Langmuir-Blodgett films (nanosheets) as a template. The SiO2 NPs took a uniformly distributed monolayer formation without any aggregates, which minimizes light scattering. This allows us to gain reproducible absorption spectra of dye molecules embedded in polymer nanosheet monolayer on the nanoscale rough surface using optical waveguide spectroscopy. The NLO polymer nanosheets containing disperse red 1 (DR) were transferred onto the SiO2 NP monolayer. The polarized absorption spectra were obtained; the s-light absorption was larger than the p-light absorption, indicating that polymer nanosheets are wrapped around SiO2 NPs so that DR moieties undergo molecular disorientation not to form H-aggregates. This method provides us with useful information on structure-property relationship between nanoshaped inorganic nanoparticle and organic functional molecules in hybrid nanoassemblies.

Original languageEnglish
Pages (from-to)457-461
Number of pages5
JournalThin Solid Films
Volume518
Issue number2
DOIs
Publication statusPublished - 2009 Nov 30

Keywords

  • Molecular orientation
  • Nanoparticle
  • Nanosheet
  • Polymer
  • Waveguide spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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