Photo-induced fabrication of surface relief gratings in alternate self-assembled films containing azo dye and alignments of LC molecules

Futao Kaneko, Takashi Kato, Akira Baba, Kazunari Shinbo, Keizo Kato, Rigoberto C. Advincula

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Photo-induced surface relief gratings of alternate layer-by-layer self-assembled films containing azobenzene dyes were fabricated. The alignment properties of nematic liquid crystal (LC) molecules on these films were investigated in a hybrid LC cell configuration. Poly(diallyldimethylammonium chloride) (PDADMAC) and Direct Red 80 (DR80, azobenzene dye) were deposited using the alternate layer-by-layer self-assembly method. The gratings of the PDADMAC/DR80 films were fabricated by exposure to interference patterns of Ar+ laser light at 488 nm. The formation of the gratings on the films was observed using atomic force microscopy. Furthermore, the alignment properties of LC molecules, 5CB, on the films were investigated by monitoring the change in birefringence of the LC cell in situ. This in-plane alignment was observed after ∼30 min exposure with the laser, simultaneous with the formation of the interference patterns.

Original languageEnglish
Pages (from-to)805-810
Number of pages6
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume198-200
DOIs
Publication statusPublished - 2002 Feb 18
Externally publishedYes

Keywords

  • Azo dye
  • LC
  • Photo-induced alignment
  • Self-assembled film
  • Surface relief grating

ASJC Scopus subject areas

  • Colloid and Surface Chemistry

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