Carbon nanotube/gold nanoparticles sensor for detection of hydrazine in the Pyrogallol Red Solution

An efficient multi-walled carbon nanotube/gold colloidal nanoparticle paste electrode (MWCNTs/ Au Nps PE) was prepared for detection of hydrazine in the presence of pyrogallol red as a mediator in the homogenous solution. The prepared MWCNTs/ Au Nps PE and multi-walled carbon nanotube paste electrode (MWCNTs PE) were characterized by Raman spectroscopy, scanning electron microscopy and cyclic voltammetry. The MWCNTs/ Au Nps PE exhibited a very large decrease in the over potential (0.3V to 0.0V) and significant enhanced peak current response for detection of hydrazine in the presence of pyrogallol red as a mediator in the Na₂CO₃ - KCl solution. The mass transfer of hydrazine on the surface of MWCNTs/Au Nps PE was controlled by adsorption process. The proposed method exhibits outstanding sensitivity (2.5 μA/μM) and low detection limit (0.4 μM) at 0.0V. All the results indicated a good potential application of this sensor in the detection of hydrazine. The use of MWCNTs/ Au Nps PE was demonstrated for detection of hydrazine in the drinking water samples.