Highly Oriented J-Aggregates of Bisazomethine Dye on Aligned Poly(tetrafluoroethylene) Surfaces
| Autor: | Takashi Kobayashi, Shinya Matsumoto, Toshihiko Tanaka, Tetsuya Aoyama, Miei Satoh |
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| Rok vydání: | 2011 |
| Předmět: |
Diffraction
Materials science Absorption spectroscopy Stereochemistry Isotropy Dichroic glass Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound Crystallography General Energy chemistry Molecule Tetrafluoroethylene Physical and Theoretical Chemistry Thin film J-aggregate |
| Zdroj: | The Journal of Physical Chemistry C. 115:19598-19605 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp2063436 |
| Popis: | Highly oriented J-aggregates have been obtained in solid, thin films of a bisazomethine dye on aligned poly(tetrafluoroethylene) (PTFE) surfaces. The aggregates show remarkable optical anisotropy resulting from their high orientational order: the dichroic ratios at their J peaks in polarized absorption spectra reach 25. Moreover, this orientation also brings about a remarkable increase in the third-order nonlinear optical susceptibility [χ(3)] of the films of over 10 times that of their isotropic films. Major molecules do not form the aggregates, but rather, form crystalline domains where the aggregates should be dispersed. Polarized absorption spectra (visible and IR) and X-ray diffraction measurements reveal that the molecules are oriented with their long axis parallel to the PTFE chains both in the aggregates and in the crystalline domains ([2 0 −1] axis ∥ PTFE chains, (010) plane ∥ substrate surface). The growth mechanism of the aggregates is discussed on the basis of both the morphology observed by a... |
| Databáze: | OpenAIRE |
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