Abstract
Organic redox mediator functionalized carbon nanomaterials has been considered the future of advanced nanomaterials owing to their exemplary behaviors. It is highly challenging to prepare stable functional carbon nanomaterials. Herein, we report a simple preparation of highly redox active and stable quinoline quinone (QLO) functionalized multiwalled carbon nanotube (MWCNT) modified glassy carbon electrode (GCE/MWCNT@QLO) by in-situ electrochemical oxidation of 8-hydroxyquinoline (QL) on a GCE/MWCNT in pH 7 phosphate buffer solution. Unlike the formation of electro-inactive and tarry polymeric products with electrochemical oxidation of QL at glassy carbon electrode, a multi-redox active QLO derivative intermediate was electro-generated as intermediate species and was trapped on a MWCNT modified electrode in this work. Specific pi-pi interaction between QL and MWCNT and its diffusion restrictive electrochemical oxidation process are keys for the selective entrapment of QLO on the underlying electrode. The QLO trapped MWCNT modified electrode (GCE/MWCNT@QLO) was characterized by Transmission electron microscope, X-ray photoelectron spectroscopy, Raman spectroscopy, Infrared spectroscopy, gas liquid chromatography coupled mass spectrometry and in-situ cyclic voltammetry (CV) electrochemical quartz crystal microbalance. CV of the GCE/MWCNT@QLO has displayed three well-defined redox peaks at E1/2=-0.45V (A1/C1), -0.1V (A2/C2) and 0V vs Ag/AgCl (A3/C3) corresponding to the electron-transfer behaviors of pyridinium ion, 2,3 and 5,8 diquinone functional groups of the MWCNT@QLO. The intermediate trapped modified electrode showed excellent electrocatalytic behavior and amperometric current-time sensing response to an environmental pollutant, hydrazine at 0V vs Ag/AgCl in pH 7 phosphate buffer solution with a calibration plot linearity and detection limit values of 25-450μM and 12μM respectively without any interference from ascorbic acid, uric acid, cysteine and nitrate. In further, flow injection analysis coupled electrochemical of hydrazine at 0V vs Ag/AgCl with a detection limit value 0.7μM was also demonstrated.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
