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Research article - Peer-reviewed, 2023

Electrochemically Modified Poly(dicyandiamide) Electrodes for Detecting Hydrazine in Neutral pH

Manavalan, Gopinathan; Natarajan, Thiyagarajan; Adeniyi, Kayode Omotayo; Zen, Jyh-Myng; Tesfalidet, Solomon; Thyrel, Mikael; Lestander, Torbjorn A.; Alla, Subba Reddy; Mikkola, Jyri-Pekka

Abstract

A new technique for sensing nanomolar concentrations of hydrazine in water samples is reported. A screen-printed carbon electrode (SPCE) altered using an amine-azo functional group encompassing poly-(dicyandiamide) is used in this study. The modified electrode exhibits an enhanced activity toward hydrazine detection at a lower overpotential and broad linear scale between 20 nM and 1 mM, with an accurate sensitivity value of 0.1 nA mu m(-1) cm(-2). To the best of our knowledge, poly-(dicyandiamide)-modified electrodes exhibit one of the lowest limits of detection for any metal-free electrode that detects 6.7 nM (S/N = 3) of hydrazine. The method established sufficient selectivity and better recoveries. Finally, the poly-(dicyandiamide)-modified SPCE* is highly suitable for electrochemical determination of hydrazine in water samples from tap and lake.

Published in

Industrial & Engineering Chemistry Research
2023, Volume: 62, number: 44, pages: 18271-18279
Publisher: AMER CHEMICAL SOC