Vertically aligned liquid crystals on tantalum oxide thin films using ion beam irradiation processing

Jin Woo Lee, Ji Hun Lim, Byeong Yun Oh, Young Hwan Kim, Hong Gyu Park, Byoung Yong Kim, Jeong Yeon Hwang, Chul Ho Ok, Byung Moo Moon, Dae Shik Seo

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Abstract

In this study, we explored the effects of ion beam (IB) bombardment on the orientation of liquid crystal (LC) molecules on Ta2 O5 surfaces. Increasing the IB exposure time resulted in improved LC alignment characteristics. Through X-ray photoelectron spectroscopy analysis, it was also confirmed that IB irradiation caused Ta 4f and O 1s peak shifts in the positive direction. The breaking phenomenon of the O 1s bonds may cause anisotropic dipole-dipole forces to stably align the vertical LC molecules. Finally, measuring the contact angles on the IB irradiated Ta2 O5 surfaces, we concluded that increasing the IB irradiation time strengthened the anisotropic surface energy on the Ta2 O5 surfaces, and stable vertical LC alignment was achieved via the transformed surface energies.

Original languageEnglish
Pages (from-to)J107-J110
JournalJournal of the Electrochemical Society
Volume157
Issue number4
DOIs
Publication statusPublished - 2010

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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    Lee, J. W., Lim, J. H., Oh, B. Y., Kim, Y. H., Park, H. G., Kim, B. Y., Hwang, J. Y., Ok, C. H., Moon, B. M., & Seo, D. S. (2010). Vertically aligned liquid crystals on tantalum oxide thin films using ion beam irradiation processing. Journal of the Electrochemical Society, 157(4), J107-J110. https://doi.org/10.1149/1.3295696