Gold Nanowire Functionalized SWCNT paper Electrode for the Electrochemical Sensing of Dopamine in the Presence of Its Interferences

Paper-based electrodes have attracted much attention in the development of flexible and portable analytical devices. These devices may have paper- electrodes either in the form of the wire electrodes or the patterned paper with complete three-electrode cells. To obtain distinctive electrochemical properties, papers are often modified with nanomaterials as they can be coated or printed relatively easily on paper to locally control the device functionality. However, the poor dispersibility of the conductive fillers and/or post-coating processing requirements have limited their analytical applications. Herein we report the high-performance paper-based SWCNT-AuNP electrode for the detection of dopamine in the presence of its common interferences. We used the pristine SWCNT paper obtained through vacuum filtration to deposit the gold nanowires through the electrodeposition method. The morphology, microstructure, chemical composition, and electrochemical behavior of the paper-based SWCNT-AuNP electrode were characterized by SEM, XPS, XRD, EIS, and CV techniques.