Abstract
Here, a simple filtration method for the fabrication of salt-induced nanoporous gold electrodes (SINPGEs) from gold nanoparticles (AuNPs) is reported. This method employs sodium chloride (NaCl) to trigger the aggregation, room-temperature sintering and region-selective deposition of AuNPs on patterned polyvinylidene fluoride (PVDF) membranes during filtration, which enables the one-step scalable fabrication of flexible SINPGEs three-electrode arrays with high conductivity, good mechanical property, large surface area and extremely low cost. Moreover, compared with traditional gold disc electrodes, the nanoporous structure of SINPGEs was demonstrated to apparently improve the electrochemical responses of various electroactive species, e.g., dopamine (DA), uric acid (UA), ascorbic acid (AA) and hydrogen peroxide (H2O2), reflected by the apparent enlargement of redox currents. In addition, the passivation effect of chloride ions (Cl−) on the oxidation of H2O2 at SINPGEs can be greatly repressed by a simple electrochemical activation approach, producing a sensitive H2O2 sensor with a calibration range of 1.0–1000 μM in the presence of 0.1 M Cl−. The present work thus establishes a new approach to the scalable construction of gold electrode-based electrochemical sensors with high performance and low cost.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.