Chandran, Achu and Joshi, Tilak and Sharma, Indu and Subhedar, Kiran M. and Mehta, Dalip S. and Biradar, Ashok M. (2019) Monolayer graphene electrodes as alignment layer for ferroelectric liquid crystal devices. Journal of Molecular Liquids, 279. pp. 294-298. ISSN 0167-7322

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Transparent electrodes and alignment layers are two essential parts of the liquid crystal (LC) cell fabrication. Conventionally, indium tin oxide (ITO) acts as transparent electrode and a polyimide film is used as alignment layer. In present study, both of these are replaced by using a monolayer graphene film deposited on glass substrate. The graphene film used to fabricate LC cell show excellent optical transmittance (similar to 95%) over 450-800 nm range and electrical resistance of 328.77 Omega/square. Moreover, the alignment of FLC mesogens over graphene monolayer is achieved owing to the pi-pi electron stacking between benzene rings of FLC and honeycomb structure of graphene. Polarizing optical microscopy (POM) shows homogeneous planar alignment of filled FLC over graphene under crossed polarizers. The cell is switched between bright and dark states under the application of electric field to demonstrate the working of LC cell. Further, dielectric relaxation spectroscopy is used to measure the dielectric constant and absorption of FLC. This application of graphene would lead to thin and defect-free devices based on LC.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s Elsevier.
Subjects: Physics > Atomic and Molecular Physics
Physical Chemistry/Chemical Physics
Depositing User: Mr. Yogesh Joshi
Date Deposited: 31 Dec 2020 11:30
Last Modified: 31 Dec 2020 11:30

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