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Visible Laser Scribing Fabrication of Porous Graphitic Carbon Electrodes: Morphologies, Electrochemical Properties, and Applications as Disposable Sensor Platforms
ACS Applied Electronic Materials ( IF 4.3 ) Pub Date : 2020-09-23 , DOI: 10.1021/acsaelm.0c00612 Eoghan Vaughan 1 , Cathal Larrigy 1 , Micheal Burke 1 , Labrini Sygellou 2 , Aidan J. Quinn 1 , Costas Galiotis 2, 3 , Daniela Iacopino 1
ACS Applied Electronic Materials ( IF 4.3 ) Pub Date : 2020-09-23 , DOI: 10.1021/acsaelm.0c00612 Eoghan Vaughan 1 , Cathal Larrigy 1 , Micheal Burke 1 , Labrini Sygellou 2 , Aidan J. Quinn 1 , Costas Galiotis 2, 3 , Daniela Iacopino 1
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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 X-ray photoelectron spectroscopy (XPS) techniques revealed a crystalline graphitic carbon structure with a 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 on 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 rate 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 lightweight portable and handheld instrumentation makes such electrodes highly promising for the realization of low-cost disposable sensing platforms for point-of-care applications.
中文翻译：
多孔石墨碳电极的可见激光划刻制造：形态，电化学性能，以及作为一次性传感器平台的应用。
多孔石墨碳电极是通过激光切割商用聚酰亚胺胶带制成的。该过程是通过简单的一步步骤进行的，使用了来自低成本爱好者激光切割机的可见波长激光辐照。所得电极显示出高度多孔的形态，富含三维（3D）互连网络和边缘平面，适用于电化学传感应用。通过拉曼光谱和X射线光电子能谱（XPS）技术进行的光谱表征揭示了具有高百分比的sp 2碳键的晶体石墨碳结构。用外球体[Ru（NH 3）6 ] 3+和内球体[Fe（CN）6 ]进行广泛的电化学表征4–，铁2 + / 3 +和多巴胺氧化还原介体在石墨碳表面上表现出准可逆的电子转移，主要由质量扩散过程控制。对于这些电极，获得了快速的异质电子传输速率，该速率高于相似的碳基材料，并且高于通过可见或红外激光辐照产生的其他石墨碳电极。考虑到与主要扩散限制机制平行发生的薄层传输机制，但总体而言，观察到的增强的电子传输速率效应归因于扩展的3D多孔网络的大比表面积，缺陷和缺陷。边缘平面。制成的电极具有优异的电催化性能，可在生物标志物抗坏血酸，多巴胺，和溶液中的尿酸。制成的电极与轻巧的便携式和手持式仪器的兼容性使得这种电极对于实现即时医疗应用的低成本一次性传感平台具有巨大的希望。
更新日期：2020-10-28
中文翻译：
多孔石墨碳电极的可见激光划刻制造：形态，电化学性能，以及作为一次性传感器平台的应用。
多孔石墨碳电极是通过激光切割商用聚酰亚胺胶带制成的。该过程是通过简单的一步步骤进行的，使用了来自低成本爱好者激光切割机的可见波长激光辐照。所得电极显示出高度多孔的形态，富含三维（3D）互连网络和边缘平面，适用于电化学传感应用。通过拉曼光谱和X射线光电子能谱（XPS）技术进行的光谱表征揭示了具有高百分比的sp 2碳键的晶体石墨碳结构。用外球体[Ru（NH 3）6 ] 3+和内球体[Fe（CN）6 ]进行广泛的电化学表征4–，铁2 + / 3 +和多巴胺氧化还原介体在石墨碳表面上表现出准可逆的电子转移，主要由质量扩散过程控制。对于这些电极，获得了快速的异质电子传输速率，该速率高于相似的碳基材料，并且高于通过可见或红外激光辐照产生的其他石墨碳电极。考虑到与主要扩散限制机制平行发生的薄层传输机制，但总体而言，观察到的增强的电子传输速率效应归因于扩展的3D多孔网络的大比表面积，缺陷和缺陷。边缘平面。制成的电极具有优异的电催化性能，可在生物标志物抗坏血酸，多巴胺，和溶液中的尿酸。制成的电极与轻巧的便携式和手持式仪器的兼容性使得这种电极对于实现即时医疗应用的低成本一次性传感平台具有巨大的希望。
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