Amperometric Determination of Hydrazine Using Au Nanoparticle Incorporated CMK-3 Modified Glassy Carbon Electrode

Abstract

In this work, ordered mesoporous carbon (CMK-3) was synthesized using the nano-casting method, in which Au nanoparticles were incorporated using the citrate-reduction method. It was characterized using various physicochemical techniques like XRD, Raman, HRSEM, BET, and HRTEM. The synthesized material was utilized as an electrocatalyst for the electrochemical determination of hydrazine (HZ). From the cyclic voltammetric studies, it is understood that the bare as well as CMK-3 modified glassy carbon electrodes fail to produce a signal against HZ. On the contrary, Au nanoparticle incorporated CMK-3 modified glassy carbon electrode (AuNP-CMK-3/GCE) senses the analyte at the applied overpotential of 0.22 V. The electrode exhibits a linear variation in sensitivity in the concentration range of 0.1 mM to 1 mM with a regression coefficient value of 0.9967. Using the amperometric measurements, the sensitivity of the electrode was investigated and it is concluded that the electrode is able to produce a signal against the target analyte in the concentration range of 3–27 μM with the R2 value of 0.9964. Further, the sensitivity and limit of detection (LOD) of the electrode against HZ were found as 0.00289 μA μM−1 and 1 μM, respectively. The selectivity of the electrode was examined in the presence of other interferents, which revealed that the electrode is selective to HZ. The real-time applicability of the electrode was ascertained in the water samples collected from the ponds.