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Int. J. Electroactive Mater. 7 (2019) 14-20

Electrochemical Investigation of Physically Adsorbed Thionine-Graphene Nanocomposite on Different Electrodes

muhammad aidil ibrahim1*, Nur Atikah Md Jani1, Raihana Mohd Yusof2, Tunku Ishak Tunku Kudin3, Ab Malik Marwan Ali4, Mohd Zu Azhan Yahya5, Oskar Hasdinor Hassan6

1Faculty of Applied Sciences, Universiti Teknologi MARA, Shah Alam, selangor, Malaysia
2Centre of Foundation Studies, Universiti Teknologi MARA, Dengkil, Selangor, Malaysia
3Ionics Materials & Devices Research Laboratory (iMADE), Universiti Teknologi MARA, Shah Alam, Selangor, Malaysia
4Institute of Science, Universiti Teknologi MARA, Shah Alam, Selangor, Malaysia
5Faculty of Defence Science & Technology, Universiti Pertahanan Nasional Malaysia, Kuala Lumpur, Wilayah Persekutuan Kuala Lumpur, Malaysia
6Faculty of Art and Design, Universiti Teknologi MARA, Shah Alam, Selangor, Malaysia

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Abstract : Graphene is a two-dimensional sheet of sp² conjugated atomic carbon and has large specific surface area. The nanocomposition with thionine sanctions the dispersal of graphene molecule in water-based solvents which allows the thionine-graphene nanocomposite (Th-G) to be fabricated onto electrode for numerous applications. As an addition, the presence of amino groups on the structure of thionine allows DNA probe to be immobilized for DNA-based biosensor applications. In this research, the comparison of the effectiveness in increasing the current density of three different electrodes fabricated with Th-G through physical adsorption was conducted through cyclic voltammetry (CV). The three different electrodes investigated, gold electrode (AuE), glassy carbon electrode (GCE) and indium tin oxide coated glass (ITO) were prepared and fabricated with Th-G through drop cast technique. The electrochemical influence of the Th-G towards the electrodes were investigated and observed to successfully increase the current densities of the bare electrodes even when fabricated using a simple technique. ITO expressing the highest current density of 581.54 µA/cm2 while preserving the redox property of Th-G making ITO as the best option for Th-G-based biosensor.

Keywords : Current Density,Graphene,Nanocomposite,Physical Adsorption,Thionine,