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Liquid Crystals Volume 49, 2022 - Issue 2
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Article

Uniformly aligned liquid crystal molecules on reformed poly(ethylene-co-vinyl acetate) layers driven by ion beam exposure

Dong Wook Leea IT Nano Electronic Device Laboratory, Department of Electrical and Electronic Engineering, Yonsei University, Seodaemun-gu, South KoreaView further author information
,
Eun Mi Kimb National Center for Nanoprocess and Equipment, Korea Institute of Industrial Technology, Buk-gu, South KoreaView further author information
,
Gi Seok Heob National Center for Nanoprocess and Equipment, Korea Institute of Industrial Technology, Buk-gu, South KoreaView further author information
,
Ju Hwan Leea IT Nano Electronic Device Laboratory, Department of Electrical and Electronic Engineering, Yonsei University, Seodaemun-gu, South KoreaView further author information
,
Dong Hyun Kima IT Nano Electronic Device Laboratory, Department of Electrical and Electronic Engineering, Yonsei University, Seodaemun-gu, South KoreaView further author information
,
Jin Young Oha IT Nano Electronic Device Laboratory, Department of Electrical and Electronic Engineering, Yonsei University, Seodaemun-gu, South KoreaView further author information
,
Jong In Jangc Electrical Engineering, Changwon National University, Changwon, Korea;d Department of Smart Manufacturing Engineering, Changwon National University, Changwon, KoreaView further author information
,
Sung Jin Eomc Electrical Engineering, Changwon National University, Changwon, Korea;d Department of Smart Manufacturing Engineering, Changwon National University, Changwon, KoreaView further author information
,
Hae-Chang Jeongc Electrical Engineering, Changwon National University, Changwon, Korea;d Department of Smart Manufacturing Engineering, Changwon National University, Changwon, KoreaCorrespondence[email protected]
View further author information
&
Dae-Shik Seoa IT Nano Electronic Device Laboratory, Department of Electrical and Electronic Engineering, Yonsei University, Seodaemun-gu, South KoreaCorrespondence[email protected]
View further author information
 show all
Pages 172-181 | Received 13 May 2021, Accepted 24 Jun 2021, Published online: 05 Jul 2021
 
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ABSTRACT

The characteristics of a poly(ethylene-co-vinyl acetate) (PEVA) film formed by spin coating process and ion beam (IB) irradiation was investigated with irradiation times. A physicochemical analysis was used to analyse the suitability of the PEVA film as a uniform liquid crystal (LC) alignment layer. Atomic force microscopy (AFM) revealed an increased surface roughness after IB irradiation. X-ray photoelectron spectroscopy (XPS) analysis showed IB irradiation broke the polymer branches and increased the oxygen concentration and bonding on the surface. These derived the strong Van der Waals forces and dipole-dipole interactions between the PEVA surface and LCs. The IB irradiation generated surface anisotropy on the PEVA film and unidirectional LC alignment was achieved. Polarised optical microscopy (POM) and pre-tilt angle measurements were carried out to show the uniform LC alignment. The transmittance curve exhibited a high optical performance. These results show the promising capabilities of IB irradiated PEVA film as an alignment layer in LC displays.

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Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) [No. 2020-0103].

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