Electronic Materials Letters

, Volume 13, Issue 3, pp 277–285 | Cite as

Ion-beam-irradiated CYTOP-transferred graphene for liquid crystal cells

  • Jeong Hyeon Oh
  • Gyu Jin Choi
  • Ki Chang Kwon
  • Sa-Rang Bae
  • Ho Won Jang
  • Jin Seog Gwag
  • Soo Young Kim


The twisted nematic liquid crystal cell was developed by using a CYTOP-transferred graphene sheet as an electrode and an alignment layer. A graphene layer was synthesized by chemical vapor deposition and transferred onto a plastic substrate using a fluoropolymer known as CYTOP. As the ion-beam treatment time increased, the sheet resistance increased from 500 to 1100 Ω/sq., while the water contact angle decreased from 110.5° to 69.7°. The increased intensities of the D and G′ bands and the appearance of D + D″ and D + G′ bands in the Raman spectra indicated the formation of defects because of the ion-beam treatment. An ion-beam exposure time of 15 s was found to be the most effective for the production of CYTOP-transferred graphene and for achieving high contrast in operating cells. The ion beam detached F from the CYTOP-transferred graphene layer, and the resulting exposure of the C=C bond on the graphene surface affected the alignment of liquid crystal molecules. Based on these results, the technique described here has applications in novel, high-performance liquid crystal displays that do not require indium-tin-oxide electrodes and polyimide alignment layers. Sheets synthesized by chemical vapor deposition were transferred and simultaneously doped using fluoropolymer supporting layers.


graphene fluoropolymer ion-beam irradiation transparent electrode alignment layer liquid crystal displays 


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Copyright information

© The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht 2017

Authors and Affiliations

  • Jeong Hyeon Oh
    • 1
  • Gyu Jin Choi
    • 2
  • Ki Chang Kwon
    • 3
  • Sa-Rang Bae
    • 1
  • Ho Won Jang
    • 3
  • Jin Seog Gwag
    • 2
  • Soo Young Kim
    • 1
  1. 1.School of Chemical Engineering and Materials ScienceChung-Ang UniversitySeoulKorea
  2. 2.Department of PhysicsYeungnam UniversityGyeongsanKorea
  3. 3.Department of Materials Science and Engineering, Research Institute of Advanced MaterialsSeoul National UniversitySeoulKorea

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