Ion-beam-irradiated CYTOP-transferred graphene for liquid crystal cells
- Authors
- Oh, Jeong Hyeon; Choi, Gyu Jin; Kwon, Ki Chang; Bae, Sa-Rang; Jang, Ho Won; Gwag, Jin Seog; Kim, Soo Young
- Issue Date
- May-2017
- Publisher
- KOREAN INST METALS MATERIALS
- Keywords
- graphene; fluoropolymer; ion-beam irradiation; transparent electrode; alignment layer; liquid crystal displays
- Citation
- ELECTRONIC MATERIALS LETTERS, v.13, no.3, pp 277 - 285
- Pages
- 9
- Journal Title
- ELECTRONIC MATERIALS LETTERS
- Volume
- 13
- Number
- 3
- Start Page
- 277
- End Page
- 285
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/4489
- DOI
- 10.1007/s13391-017-1722-y
- ISSN
- 1738-8090
2093-6788
- Abstract
- 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 Omega/sq., while the water contact angle decreased from 110.5A degrees to 69.7A degrees. The increased intensities of the D and G' bands and the appearance of D + DaEuro(3) 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.
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