This paper reports on a microfluidic Impedimetric nitrate sensor using graphene oxide (GO) nanosheets enabled poly(3,4-ethylenedioxythiophene) nanofibers (PEDOT-NFs) as an electrochemical working electrode. The sensor has demonstrated its capability to detect nitrate ions in real samples extracted from soil. The PEDOT NFs-GO composite serves as an effective matrix for immobilization of nitrate reductase enzyme molecules. The oxygenated functional groups available at GO allows increasing the charge transfer resistance of the PEDOT NFs-GO based electrode. Systematic microscopic, spectroscopic, and electrochemical studies were conducted to illustrate synergic interactions between the GO and PEDOT NFs. The sensor provides a sensitivity of 61.15 Ω/(mg/L)/cm 2 within a concentration range of 0.44 − 442 mg/L for nitrate ions. The detection limit of the sensor is 0.135 mg/L with good specificity, reliability, and reproducibility.

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