Amperometric sensor for sensitive determination of hydrazine based on the glassy carbon electrode modified with a composite of polymer film and graphene oxide nanosheet

Hydrazine is a common reagent used in the chemical industry. Moreover, hydrazine also used in some formula for pharmaceutical drug usage [1]. Due to the excellent anti-poisoning ability in fuel electro-oxidization process, hydrazine also known as a good candidate in direct fuel cell system [2]. Many techniques have been already studied for detecting hydrazine. Relative to other techniques spectrophotometry [3], chemiluminescence [4] and high-performance liquid chromatography [5] , electrochemical techniques offer a portable, economical, sensitive and rapid methodology for the determination of hydrazine.In this work, a promising electrochemical sensor was developed based on a layer process by electropolymerization of aminoacetic acid on the surface of the graphene oxide nanosheet pre-coated glassy carbon electrode (GCE). The surface morphology of the modified electrode was characterized by field emission scanning electron microscopy. The modified GCE shows high electrocatalytic activity toward the oxidation and determination of hydrazine. The kinetic parameters such as the electron transfer coefficient (α) and charge transfer rate constant (k) for the oxidation of hydrazine was determined utilizing cyclic voltammetry (CV). The diffusion coefficient (D) of hydrazine was also estimated using chronoamperometry. A quick amperometric response was observed with the electrochemical sensor based on composite film for the hydrazine measurement in a wide linear range of 10 to 200 μM, where the limit of the detection was 3.6 μM(S/N = 3). The results of the analysis suggest that the proposed method promises accurate results and could be employed for the routine determination of hydrazine.