Temperature-controlled liquid crystals alignment on solution-derived bismuth lanthanum tin oxide films prepared through brush process

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

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, a bismuth–lanthanum–tin oxide film was fabricated via brush coating to obtain a process-efficient liquid crystal (LC) alignment layer. The brush-coating solution was prepared through a sol–gel process, applied onto an indium tin oxide glass, and cured at various temperatures. The shearing stress caused by the brush coating process formed a micro-/nanogroove structure, as confirmed via atomic force microscopy and line profile analyses. The chemical composition of the surface was analysed through X-ray photoelectron spectroscopy, and the optical transmittance of the film was measured. As regards the LC alignment, polarised optical microscopy observations, thermal stability tests, and pretilt angle measurements were performed, confirming a stable alignment; the grooves generated during the shearing and hardening phases were most clearly formed after curing at 180°C, which led to stable LC orientation.

Original languageEnglish
Pages (from-to)2137-2145
Number of pages9
JournalLiquid Crystals
Volume49
Issue number15
DOIs
Publication statusPublished - 2022

Bibliographical note

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

Publisher Copyright:
© 2022 Informa UK Limited, trading as Taylor & Francis Group.

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics

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