Surface modified solution-derived nickel oxide film via ion-beam irradiation as a liquid crystal alignment layer

Ju Hwan Lee, Jonghoon Won, Hae Chang Jeong, Dong Hyun Kim, Dong Wook Lee, In Ho Song, Byeong Yun Oh, Jeong Min Han, Dai Hyun Kim, Dae-Shik Seo

Research output: Contribution to journalArticle

Abstract

In this article, we demonstrate the liquid crystal (LC) alignment characteristics of solution-derived nickel oxide (NiO) film modified with ion-beam (IB) irradiation. Cross-polarized optical microscopy and pretilt angle measurements verified that uniform LC alignment was achieved using the NiO film as an alignment layer regardless of IB incidence angle. Contact angle measurements revealed that all of the NiO films had a deionized water contact angle below 90°, which indicates that they had hydrophilic surfaces that had an effect on the homogeneous LC alignment. Atomic force microscopy was conducted to determine the physical surface modification due to the IB irradiation, which showed that it reduced the size of the surface grains with agglomerations depending on the surface tilt from the IB incidence angle. Furthermore, microgroove structures strongly related to uniform LC alignment were observed after IB irradiation. Chemical surface modification was investigated via an X-ray photoelectron spectroscopy analysis which revealed that IB irradiation modified the chemical bonds in the NiO film, and this affected the LC alignment state. Thus, these results indicate that using NiO film exposed to IB irradiation as an alignment layer is a suitable method for LC applications.

Original languageEnglish
JournalJournal of the Society for Information Display
DOIs
Publication statusAccepted/In press - 2019 Jan 1

Fingerprint

Liquid Crystals
Nickel oxide
nickel oxides
Liquid crystals
Ion beams
Oxide films
oxide films
ion beams
liquid crystals
alignment
Irradiation
irradiation
Angle measurement
Contact angle
Surface treatment
incidence
Deionized water
Chemical bonds
chemical bonds
agglomeration

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

Cite this

Lee, Ju Hwan ; Won, Jonghoon ; Jeong, Hae Chang ; Kim, Dong Hyun ; Lee, Dong Wook ; Song, In Ho ; Oh, Byeong Yun ; Han, Jeong Min ; Kim, Dai Hyun ; Seo, Dae-Shik. / Surface modified solution-derived nickel oxide film via ion-beam irradiation as a liquid crystal alignment layer. In: Journal of the Society for Information Display. 2019.
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abstract = "In this article, we demonstrate the liquid crystal (LC) alignment characteristics of solution-derived nickel oxide (NiO) film modified with ion-beam (IB) irradiation. Cross-polarized optical microscopy and pretilt angle measurements verified that uniform LC alignment was achieved using the NiO film as an alignment layer regardless of IB incidence angle. Contact angle measurements revealed that all of the NiO films had a deionized water contact angle below 90°, which indicates that they had hydrophilic surfaces that had an effect on the homogeneous LC alignment. Atomic force microscopy was conducted to determine the physical surface modification due to the IB irradiation, which showed that it reduced the size of the surface grains with agglomerations depending on the surface tilt from the IB incidence angle. Furthermore, microgroove structures strongly related to uniform LC alignment were observed after IB irradiation. Chemical surface modification was investigated via an X-ray photoelectron spectroscopy analysis which revealed that IB irradiation modified the chemical bonds in the NiO film, and this affected the LC alignment state. Thus, these results indicate that using NiO film exposed to IB irradiation as an alignment layer is a suitable method for LC applications.",
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Surface modified solution-derived nickel oxide film via ion-beam irradiation as a liquid crystal alignment layer. / Lee, Ju Hwan; Won, Jonghoon; Jeong, Hae Chang; Kim, Dong Hyun; Lee, Dong Wook; Song, In Ho; Oh, Byeong Yun; Han, Jeong Min; Kim, Dai Hyun; Seo, Dae-Shik.

In: Journal of the Society for Information Display, 01.01.2019.

Research output: Contribution to journalArticle

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AU - Lee, Dong Wook

AU - Song, In Ho

AU - Oh, Byeong Yun

AU - Han, Jeong Min

AU - Kim, Dai Hyun

AU - Seo, Dae-Shik

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N2 - In this article, we demonstrate the liquid crystal (LC) alignment characteristics of solution-derived nickel oxide (NiO) film modified with ion-beam (IB) irradiation. Cross-polarized optical microscopy and pretilt angle measurements verified that uniform LC alignment was achieved using the NiO film as an alignment layer regardless of IB incidence angle. Contact angle measurements revealed that all of the NiO films had a deionized water contact angle below 90°, which indicates that they had hydrophilic surfaces that had an effect on the homogeneous LC alignment. Atomic force microscopy was conducted to determine the physical surface modification due to the IB irradiation, which showed that it reduced the size of the surface grains with agglomerations depending on the surface tilt from the IB incidence angle. Furthermore, microgroove structures strongly related to uniform LC alignment were observed after IB irradiation. Chemical surface modification was investigated via an X-ray photoelectron spectroscopy analysis which revealed that IB irradiation modified the chemical bonds in the NiO film, and this affected the LC alignment state. Thus, these results indicate that using NiO film exposed to IB irradiation as an alignment layer is a suitable method for LC applications.

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