An Electrochemical Sensor Based on Functionalized Carbon Nanotube with Pyrazole Derivative for Determination of Hydrazine

In this work, we synthesis and application of functionalized carbon nanotubes (CNTs) In this work, we synthesis and application of functionalized carbon nanotubes (CNTs) with6amino4(3,4dihydroxyphenyl)3methyl1,4dihydropyrano[2,3c]pyrazole5 carbonitrile (pyrazole derivative (APC)) as sensing platform toward hydrazine (HZ). Electrochemical properties of functionalized carbon nanotubes composite (APCCNT) were investigated by cyclic voltammetry, chronoamperometry and differential pulse voltammetry techniques. It was found that the APCCNT composite exhibited a pair of redox peaks, which is due to the electron transfer between the APC and the glassy carbon electrode. The electrocatalytic properties of the APCCNT composite for HZ oxidation was remarkably increased as compared to only CNTs. The kinetic parameters of the APCCNT composite in the presence and absence of HZ was studied by electrochemical methods. The APCCNT modified electrode revealed an excellent voltammetric response to oxidation of HZ with a wide linear range from 0.01 μM to 120.0 µM and limit of detection of 8.6 nM. Also, APCCNT modified electrode shows high selectivity, good stability, reproducibility with a RSD less than 2.11%.