Synthesis of Cobalt hexacyanoferrate decorated graphene oxide/carbon nanotubes-COOH hybrid and their application for sensitive detection ofhydrazine

ABSTRCT A three-dimensional graphene oxide/carbon nanotubes-COOH hybrid (GO/CNTs-COOH) consisted of two-dimensional graphene oxide (GO) and one-dimensional carbon nanotubes-COOH (CNTs-COOH) was synthesized. The GO/CNTs-COOH hybrid exhibited excellent water-solubility owing to the high hydrophilicity of GO components and the carboxylation of carbon nanotubes. The cobalt hexacyanoferrate decorated GO/CNTs-COOH (CoHCF/GO/CNTs-COOH) has been prepared using electrostatic adsorption of Co 2+ on GO/CNTs-COOH and K 4 [Fe(CN) 6 ] as an in-situ chemical precipitant. FT-IR, Raman spectroscopy, TEM, SEM, and cyclic voltammetry were utilized to characterize the nanohybrid. The electrochemistry behavior of hydrazine on different modified electrodes was also studied. The CoHCF/GO/CNTs-COOH modified GCE (CoHCF/GO/CNTs-COOH/GCE) exhibited greatly enhanced electrocatalytic performance towards electro-oxidation of hydrazine. The oxidation peak currents showed good linear relationships with concentration of hydrazine. It can be applied to detect hydrazine in samples sensitively.