Well-ordered nanostructured organic/inorganic hybrid thin film construction via UV nanoimprint lithography applicable to liquid crystal systems

Dong Wook Lee, Jong Hoon Won, Dong Hyun Kim, Jin Young Oh, Dae Hyun Kim, Yang Liu, Dae Shik Seo

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

In this study, a well-ordered unidirectional nanostructure was successfully imprinted on a UV curable polymer/indium oxide hybrid film using UV nanoimprint lithography (NIL). The surface morphologies of the hybrid films were analyzed by atomic force microscopy (AFM), and the uniform nanostructure with a period of 820 nm and height of 30 nm was observed on a 6 min UV-irradiated film by line profile from AFM. The chemical modification of the films according to UV irradiation time was analyzed by X-ray photoelectron spectroscopy. The nanopatterned hybrid film was applied to the liquid crystal (LC) alignment layer and the polarized optical microscopy and pretilt angle analysis demonstrated the highly uniform and homogeneous LC alignment state. The unidirectional nanostructure guided the LCs orientation and the aligned surface anisotropy which induces the uniform LC alignment. The hybrid film chemical affinity was analyzed by contact angle measurement, and the increased surface energy after UV irradiation contributed to the homogeneous LC alignment. Therefore, various organic/inorganic hybrid films can be used for nanostructure construction via UV NIL, and it has a high potential for application in diverse LC systems.

Original languageEnglish
Article numbere52445
JournalJournal of Applied Polymer Science
Volume139
Issue number26
DOIs
Publication statusPublished - 2022 Jul 10

Bibliographical note

Publisher Copyright:
© 2022 Wiley Periodicals LLC.

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

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