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      Reflectivity optimization of the SPR graphene sensor


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          In this study, the optimization of the surface plasmon resonance (SPR) sensor based on graphene–silver substrate was investigated. We simulated the reflection spectrum that depends on the metal thickness and the number of graphene layers. The addition of a certain number of graphene layers based on the knowledge that silver oxidation decreases the sensitivity of the sensor improved the sensitivity S RI, while the detection accuracy decreased. To optimize the sensor performance, the investigation focused on monolayer graphene. Furthermore, genetic algorithms were used to optimize the SPR biosensor reflection by adjusting the coefficients of the system, which are the incidence angle and metal layer thickness.

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          Highly sensitive graphene biosensors based on surface plasmon resonance.

          A surface plasmon resonance (SPR) based graphene biosensor is presented. It consists of a graphene sheet coated above a gold thin film, which has been proposed and experimentally fabricated recently [ChemPhysChem 11, 585 (2010)]. The biosensor uses attenuated total reflection (ATR) method to detect the refractive index change near the sensor surface, which is due to the adsorption of biomolecules. Our calculations show that the proposed graphene-on-gold SPR biosensor (with L graphene layers) is (1 + 0.025 L) x gamma (where gamma > 1) times more sensitive than the conventional gold thin film SPR biosensor. The improved sensitivity is due to increased adsorption of biomolecules on graphene (represented by the factor gamma) and the optical property of graphene.
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            Graphene-Based Liquid Crystal Device

            Graphene is only one atom thick, optically transparent, chemically inert, and an excellent conductor. These properties seem to make this material an excellent candidate for applications in various photonic devices that require conducting but transparent thin films. In this letter, we demonstrate liquid crystal devices with electrodes made of graphene that show excellent performance with a high contrast ratio. We also discuss the advantages of graphene compared to conventionally used metal oxides in terms of low resistivity, high transparency and chemical stability.
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              Sensitivity enhancement of a surface plasmon resonance based biomolecules sensor using graphene and silicon layers


                Author and article information

                An Interdisciplinary Journal of Nano Science and Technology
                Akadémiai Kiadó
                December 2018
                : 13
                : 1
                : 5-17
                [ 1 ]Physics Department, Faculty of Material Sciences,University of Batna1 , 05000, Algeria
                [ 2 ]Electronic Department, Faculty of Science of Engineering,University of Batna2 , 05000, Algeria
                Author notes

                Corresponding authors, E-mail: zohirdibi@ 123456yahoo.fr

                The Author(s)

                This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (https://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted use, distribution, and reproduction in any medium for non-commercial purposes, provided the original author and source are credited, a link to the CC License is provided, and changes – if any – are indicated.

                : 10 October 2017
                : 14 February 2018
                : 15 March 2018
                Page count
                Pages: 13

                Materials properties,Nanomaterials,Chemistry,Nanotechnology,Analytical chemistry,Thin films & surfaces
                surface plasmon resonance (SPR),biosensor,graphene,genetic algorithm


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