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Copper-based interdigitated electrodes with GO/nafion coating for robust hydrazine sensing
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DOI：10.1016/j.jelechem.2026.120077.png)
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Abstract
En 中文
Interdigitated electrode platforms offer a versatile and scalable architecture for miniaturized electrochemical sensing applications. In this study, electrodes were patterned on a copper-clad substrate and subsequently wetetched using FeCl3. Graphene oxide (GO) and a protective Nafion layer were applied over the working, counter, and on-chip Ag/AgCl reference electrodes to suppress copper corrosion during operation. Chronoamperometric measurements at the optimized potential exhibited a linear responses in the 0.5-8 & micro;M and 10-20 & micro;M range, with a limit of detection of 1.2 & micro;M and 2.1 & micro;M. Five independently fabricated devices showed reproducibility within 1.5-8%, while interference tests with H2O2, NH3, Pb2+, and Fe3+ revealed signal variations below 5%. The sensor retained over 95% of its initial current after five days of storage. Spike-and-recovery analyses in real samples yielded recoveries above 95%. Energy-dispersive X-ray spectroscopy confirmed progressive oxide removal following etching and uniform GO/Nafion deposition. The facile fabrication process, inherent miniaturization, and robust performance in near-neutral media underscore the potential of the platform for hydrazine monitoring in environmental applications.
Keywords:
Interdigitate electrodes
Graphene oxide
Nafion
Copper
Hydrazine
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