Effects of plasma treatments on correlation between chemical structures of DLC films and liquid crystal alignment

Ji Hyuk Choi, Moon Ho Ham, Byeong Yun Oh, Jeoung Yeon Hwang, Sung Ho Choi, Dae Shik Seo, Jae Min Myoung

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

In an effort to obtain an improved liquid crystal (LC) alignment layer for liquid crystal display device applications, amorphous diamond-like carbon thin films were deposited on ITO-coated glass substrates by an rf magnetron sputtering technique at room temperature and then treated with plasma in various atmospheres. The polarized images and pretilt angles of the LC cells showed that LC alignment was enhanced by post-plasma treatments of the films. In Raman and X-ray photoelectron spectroscopy spectra of the films, an increase in the fraction of sp2-bonding was observed after post-plasma treatments of the films. In particular, H2 plasma-treated film had the largest fraction of sp2-bonding at the film surface and showed much improved alignment capabilities. These results suggest that π-bondings of the sp 2-structure at the surface rather than the bulk play an important role in LC alignment.

Original languageEnglish
Pages (from-to)947-951
Number of pages5
JournalLiquid Crystals
Volume33
Issue number8
DOIs
Publication statusPublished - 2006 Sep 1

Fingerprint

Liquid Crystals
Liquid crystals
liquid crystals
alignment
Plasmas
crystals
Diamond
Carbon films
display devices
ITO (semiconductors)
Liquid crystal displays
Magnetron sputtering
Diamonds
magnetron sputtering
X ray photoelectron spectroscopy
diamonds
photoelectron spectroscopy
atmospheres
Glass
Thin films

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Choi, Ji Hyuk ; Ham, Moon Ho ; Oh, Byeong Yun ; Hwang, Jeoung Yeon ; Choi, Sung Ho ; Seo, Dae Shik ; Myoung, Jae Min. / Effects of plasma treatments on correlation between chemical structures of DLC films and liquid crystal alignment. In: Liquid Crystals. 2006 ; Vol. 33, No. 8. pp. 947-951.
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Effects of plasma treatments on correlation between chemical structures of DLC films and liquid crystal alignment. / Choi, Ji Hyuk; Ham, Moon Ho; Oh, Byeong Yun; Hwang, Jeoung Yeon; Choi, Sung Ho; Seo, Dae Shik; Myoung, Jae Min.

In: Liquid Crystals, Vol. 33, No. 8, 01.09.2006, p. 947-951.

Research output: Contribution to journalArticle

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AU - Choi, Ji Hyuk

AU - Ham, Moon Ho

AU - Oh, Byeong Yun

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AU - Seo, Dae Shik

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