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Visible laser scribing fabrication of porous graphitic carbon electrodes: Morphology, electrochemical properties and applications as disposable sensor platform
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Accepted Version
Date
2020-09-23
Authors
Vaughan, Eoghan
Larrigy, Cathal
Burke, Micheal
Sygellou, Labrini
Quinn, Aidan J.
Galiotis, Costas
Iacopino, Daniela
Journal Title
Journal ISSN
Volume Title
Publisher
ACS Publications
Published Version
Abstract
Porous graphitic carbon electrodes were fabricated by laser scribing of commercial polyimide tape. The process was performed by a simple one-step procedure using visible wavelength laser irradiation from a low-cost hobbyist laser cutter. The obtained electrodes displayed a highly porous morphology, rich in three-dimensional (3D) interconnected networks and edge planes, suitable for electrochemical sensing applications. Spectral characterization by Raman and XPS spectroscopies revealed a crystalline graphitic carbon structure with high percentage of sp2 carbon bonds. Extensive electrochemical characterization performed with outer sphere [Ru(NH3)6]3+ and inner sphere [Fe(CN)6]4-, Fe2+/3+ and dopamine redox mediators showed quasi-reversible electron transfer at the graphitic carbon surface, mainly dominated by a mass diffusion process. Fast heterogeneous electron-transfer rates, higher than similar carbon-based materials and higher than other graphitic carbon electrodes produced by either visible or infrared laser irradiation, were obtained for these electrodes. Thin-layer transport mechanisms occurring in parallel to the main diffusion-limited mechanism were taken into consideration, but overall the observed enhanced electron-transfer rates effects were ascribed to the large specific surface area of the extended 3D porous network, rich in defects and edge-planes. The superior electrocatalytic properties of the fabricated electrodes allowed electrochemical differentiation between the biomarkers ascorbic acid, dopamine and uric acid in solution. The compatibility of fabricated electrodes with light-weight portable and handheld instrumentation makes such electrodes highly promising for the realisation of low-cost disposable sensing platforms for point-of-care applications.
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Keywords
Low-cost disposable sensing platforms , Point-of-care applications , Fabricated electrodes , Porous graphitic carbon electrodes
Citation
Vaughan, E., Larrigy, C., Burke, M., Sygellou, L., Quinn, A. J., Galiotis, C. and Iacopino, D (2020) 'Visible laser scribing fabrication of porous graphitic carbon electrodes: Morphology, electrochemical properties and applications as disposable sensor platform', ACS Applied Electronic Materials. doi: 10.1021/acsaelm.0c00612
Copyright
© 2020, American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Electronic Materials, after technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/abs/10.1021/acsaelm.0c00612