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        Study of electrical conductivity and photoelectric response of liquid phase exfoliated graphene thin film prepared via spray pyrolysis route

        Vasanthi V.,Logu T.,Ramakrishnan V.,Anitha K.,Sethuraman K. 한국탄소학회 2020 Carbon Letters Vol.30 No.4

        Facile process for the fabrication of multi-layer graphene thin flm (MLGF) is reported here. Multi-layer graphene dispersion prepared by liquid-phase exfoliation of graphite was sprayed on a glass substrate by spray pyrolysis method. The structural, optical and electrical properties of the deposited MLGF are investigated. The sheets of graphene are deposited uniformly on the substrate and distribution of small graphene sheets with size of 300–500 nm can be observed in SEM image. AFM and micro-Raman results ensured that the spray-coated graphene thin flm is composed of multi-layer graphene sheets. Spray coated graphene thin flm showed signifcant optical transparency of 57% in the visible region (400–550 nm). MLGF pos�sessed the electrical conductivity in the order of 744 S/m with surface resistivity of 3.54 k Ω/sq. The prepared liquid-phase exfoliated graphene thin flm showed superior photoelectric response. The results of this study provided a framework for fabricating an optimized MLGF using a spray pyrolysis route for optoelectronics devices.

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        Investigation on Induced Non-Tilted Smectic A* and Thermochromic Eect in Tilted Smectic C Phase of Linear Double Hydrogen Bonded Ferroelectric Liquid Crystals

        P. Subhasri,T. Vasanthi,V. N. Vijayakumar,R. Jayaprakasam 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.74 No.4

        Linear double hydrogen bonded ferroelectric liquid crystal (HBFLC) complexes are derived from non-mesogenic (R)-(+)-methylsuccinic acid and mesogenic 4-n-alkyloxybenzoic acids. Fourier transform infrared (FT-IR), polarizing optical microscope (POM), dierential scanning calorimetry (DSC) and X-ray diraction (XRD) studies are used to verify the existence of intermolecular hy- drogen bonds in the synthesized HBFLC complexes. An induced orthogonal non-tilted smectic A phase and a noteworthy observation of a thermally tuned thermochromic phenomenon are analyzed by using textural and thermal studies. Due to increasing elastic viscous force, the induced hexago- nal higher- order smectic G phase is reported in the lower alkyloxy carbon mesogens whereas the same is not observed in the individual compounds. Based on the temperature and change in the alkyloxy chain length, the induced thermochromic eect is discussed. Quenching of the nematic phase by an induced orthogonal phase is observed. Other liquid crystal parameters, such as the melting point, the phase transition temperature, the texture and the enthalpy, are reported.

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