Controlled nano structures on solution-processed inorganic/organic film for liquid crystal application

Dong Hyun Kim, Ju Hwan Lee, Dong Wook Lee, Jin Young Oh, Jonghoon Won, Yang Liu, Dae Shik Seo

Research output: Contribution to journalArticlepeer-review

Abstract

Ultraviolet (UV) nanoimprint lithography (NIL) was performed using a hybrid solution of ZnO and UV-curable polymer. The concentration of the UV-curable polymer was varied as 5, 10, and 15 wt.%, and the surface was analyzed for each film. Physical modification of the surface morphology was analyzed by atomic force microscopy, and the clearest pattern was confirmed at 15 wt.%. Through X-ray photoelectron spectroscopy analysis, it was confirmed that the difference in the concentration of the UV-curable polymer caused a difference in the atomic and bonding composition on the film surface. Through optical transmittance measurements, it was observed that all of the patterned ZnO hybrid films exhibited sufficient transmittance. To investigate liquid crystal (LC) alignment, each of these films was assembled into an antiparallel structure to fabricate LC cells. Using polarized optical microscopy and thermal stability tests, it was confirmed that the LC cells fabricated with the 15 wt.% solution showed the most stable LC alignment. Moreover, pretilt angle measurements showed that the most stable transmittance curve was obtained with the 15 wt.% LC cell. The relationship between the height of the groove pattern and alignment of the LC molecules was analyzed using Berreman’s model. [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)412-424
Number of pages13
JournalJournal of Sol-Gel Science and Technology
Volume104
Issue number2
DOIs
Publication statusPublished - 2022 Nov

Bibliographical note

Funding Information:
This research was supported by the National Research Foundation of Korea (grant No. 2022R1F1A106419211).

Publisher Copyright:
© 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • General Chemistry
  • Biomaterials
  • Condensed Matter Physics
  • Materials Chemistry

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