Abstract
Recently, graphene as a material for sensors has attracted attention due to unique properties, such as: excellent electrical and thermal conductivity, chemical stability, high surface area and Young�s modulus ̴ 1GPa, very promising for electrochemical applications. Electrochemical sensors based on graphene have been used in many applications, such as: biomolecules, gases or metal ions detection. Here, we report the effect of morphology and orientation of graphene as electrode material with electrochemical method. We investigated the capacitive performance in the case of horizontal and vertical graphene sheets, synthetized by thermal chemical vapor deposition (CVD), respectively plasma enhanced chemical vapor deposition (PECVD). Graphene electrode is used in electrochemical cells with three electrodes as a working electrode. Raman spectroscopy was carried on the graphene films for quality and structure characterization. The working electrode was characterized by scanning electron microscopy (SEM), Raman spectroscopy and electrochemical method.
Highlights
Graphene sheets horizontal and vertical oriented on working electrode affects the electrochemical performance, evidenced by this study
We evaluate the morphology of single layer graphene transferred on SiO2 substrate and of vertical graphene on SiO2 substrate
We presented comparatively study of the single layer graphene and vertical graphene based on electrode materials as a platform for optical and bio sensing devices
Summary
Single layer graphene is reported with a good thermal conductivity of 5000 W/mK at room temperature. Latest scientifically reports have largely illustrated on the scalability of graphene-based materials through CVD synthesis method [13, 14]. It is considered that each vertical graphene nanosheet represents a self-supported structure with rigid integrity by itself [15] Another feature of it is its morphology which is non-agglomerated and has high specific surface area. According to Zheny et al [18], vertical graphene obtained by PECVD method using the parameters gas mixture CH4/C2H2 and temperature 300-800°C, has following features: surface area 1100-1800 m2g-1, pore size less than 1 μm and electrical conductivity in range of 102-103 Sm-1. According to Yamada T. et al, in a study from 2017 [19], they found the reflectance of vertically aligned graphene nanosheets less than 0.067%
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