▎ 摘　　要

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. (C) 2019 Published by Elsevier B.V.