Polymer ultrathin films via alternate self-assembly adsorption of polyelectrolyte and azo-dye molecules

photo-induced alignment and LC display properties

R. C. Advincula, A. Baba, F. Kaneko

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In this report, we describe the fabrication and photo-induced alignment of ultrathin films of small molecular azobenzene dyes and polyelectrolytes using the alternate polyelectrolyte deposition (APD) technique. The molecular self-assembly process were investigated by QCM, ellipsometry, UV-vis spectroscopy, X-ray reflectometry, and other surface sensitive spectroscopic and microscopic methods to correlate with film formation parameters. The importance of layer ordering and dye aggregation phenomena is emphasized. We then utilized polarized UV-light to induce photo-alignment of these ultrathin films and observed high anisotropies dependent on the dye, layer preparation and thickness. Fabrication of hybrid LC cells using a nematic LC reveal that in-plane homogeneous alignment is influenced by the anisotropy of the dye aggregates.

Original languageEnglish
Pages (from-to)195-200
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume559
Publication statusPublished - 1999
Externally publishedYes

Fingerprint

Azo Compounds
Azo dyes
Ultrathin films
Polyelectrolytes
Polymer films
Self assembly
self assembly
Coloring Agents
Dyes
dyes
Display devices
alignment
Adsorption
Molecules
adsorption
polymers
molecules
Anisotropy
Fabrication
anisotropy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

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title = "Polymer ultrathin films via alternate self-assembly adsorption of polyelectrolyte and azo-dye molecules: photo-induced alignment and LC display properties",
abstract = "In this report, we describe the fabrication and photo-induced alignment of ultrathin films of small molecular azobenzene dyes and polyelectrolytes using the alternate polyelectrolyte deposition (APD) technique. The molecular self-assembly process were investigated by QCM, ellipsometry, UV-vis spectroscopy, X-ray reflectometry, and other surface sensitive spectroscopic and microscopic methods to correlate with film formation parameters. The importance of layer ordering and dye aggregation phenomena is emphasized. We then utilized polarized UV-light to induce photo-alignment of these ultrathin films and observed high anisotropies dependent on the dye, layer preparation and thickness. Fabrication of hybrid LC cells using a nematic LC reveal that in-plane homogeneous alignment is influenced by the anisotropy of the dye aggregates.",
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year = "1999",
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T1 - Polymer ultrathin films via alternate self-assembly adsorption of polyelectrolyte and azo-dye molecules

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AU - Baba, A.

AU - Kaneko, F.

PY - 1999

Y1 - 1999

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AB - In this report, we describe the fabrication and photo-induced alignment of ultrathin films of small molecular azobenzene dyes and polyelectrolytes using the alternate polyelectrolyte deposition (APD) technique. The molecular self-assembly process were investigated by QCM, ellipsometry, UV-vis spectroscopy, X-ray reflectometry, and other surface sensitive spectroscopic and microscopic methods to correlate with film formation parameters. The importance of layer ordering and dye aggregation phenomena is emphasized. We then utilized polarized UV-light to induce photo-alignment of these ultrathin films and observed high anisotropies dependent on the dye, layer preparation and thickness. Fabrication of hybrid LC cells using a nematic LC reveal that in-plane homogeneous alignment is influenced by the anisotropy of the dye aggregates.

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