Electroanalytical properties and application of anthraquinone derivative-functionalized multiwalled carbon nanotubes nanowires modified glassy carbon electrode in the determination of dissolved oxygen

We herein report a simple, low cost and green preparation of nanowires of (anthraquinone-2-carboxylic acid/amino functionalized) multiwalled carbon nanotubes (HOOC-2-AQ/AMWCNTs) which has been further employed for the development of highly sensitive oxygen sensor. The prepared composite has been characterized by TEM and electrochemical studies. The glassy carbon electrode modified with composite shows an irreversible and good electrocatalytic activity for the reduction of oxygen. The reduction potential of the oxygen was shifted 460 mV towards the positive potential with this modified electrode as compared to bare glassy carbon electrode. The prepared material was stable with no leaching observed of the mediator. A linear response range of 0.2–6.8 mg L−1, with a sensitivity of 5.0 μA L mg−1 and a detection limit of 0.02 mg L−1 were obtained with this sensor.

Graphical abstractA nanocomposite was prepared by anthraquinone derivative-functionalized multiwalled carbon nanotubes. These nanowires enable electrical communication between the electrode and analyte. The composite has been successfully applied in the determination of dissolved oxygen.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Fabricated a nanocomposite of anthraquinone-2-carboxylic acid and functionalized multiwalled carbon nanotubes. ► Nanocomposite modified electrode shows electrocatalytic activity for the reduction of oxygen. ► Detection limit of 0.02 mg L−1 better than most of reported works. ► The electrode employed for detection of oxygen in real samples.