title: Cyclic voltammetry deposition of copper nanostructure on MWCNTs modified pencil graphite electrode: An ultra-sensitive hydrazine sensor.
abstract: In this study, Copper (Cu) nanostructures (CuNS) were electrochemically deposited on a film of multiwall carbon nanotubes (MWCNTs) modified pencil graphite electrode (MWCNTs/PGE) by cyclic voltammetry method to fabricate a CuNS-MWCNTs composite sensor (CuNS-MWCNT/PGE) for hydrazine detection. Scanning electron microscopy (SEM) and Energy-dispersive X-ray spectroscopy (EDX) were used for the characterization of CuNS on the MWCNTs matrix. The composite of CuNS-MWCNTs was characterized with cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The preliminary studies showed that the proposed sensor have a synergistic electrocatalytic activity for the oxidation of hydrazine in phosphate buffer. The catalytic currents of square wave voltammetry had a linear correlation with the hydrazine concentration in the range of 0.1 to 800μM with a low detection limit of 70nM. Moreover, the amperometric oxidation current exhibited a linear correlation with hydrazine concentration in the concentration range of 50-800μM with the detection limit of 4.3μM. The proposed electrode was used for the determination of hydrazine in real samples and the results were promising. Empirical results also indicated that the sensor had good reproducibility, long-term stability, and the response of the sensor to hydrazine was free from interferences. Moreover, the proposed sensor benefits from simple preparation, low cost, outstanding sensitivity, selectivity, and reproducibility for hydrazine determination.
authors.affiliation: Faculty of Sciences, Razi University, Kermanshah, Iran.
authors.forename: Hamid
authors.initials: H
authors.lastname: Heydari
authors.affiliation: Faculty of Sciences, Razi University, Kermanshah, Iran. Electronic address: mbgholivand@razi.ac.ir.
authors.forename: Mohammad B
authors.initials: MB
authors.lastname: Gholivand
authors.affiliation: Department of Chemistry, Malek Ashtar University of Technology, Tehran, Iran.
authors.forename: Abbas
authors.initials: A
authors.lastname: Abdolmaleki
mesh_terms: D002384:Catalysis; D003300:Copper / Q000737:chemistry*; D058266:Dielectric Spectroscopy; D055664:Electrochemical Techniques; D004566:Electrodes; D006108:Graphite / Q000737:chemistry; D006834:Hydrazines / Q000032:analysis*; D057230:Limit of Detection; D053768:Metal Nanoparticles / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010084:Oxidation-Reduction; D015203:Reproducibility of Results
chemical_list: D006834:Hydrazines; D037742:Nanotubes, Carbon; C029424:hydrazine; D006108:Graphite; D003300:Copper
keywords: Amperometry; Copper nanostructure; Cyclic voltammetry deposition; Hydrazine; Multiwall carbon nanotube; Square wave voltammetry