Sensitive Dopamine Sensor Based on Three Dimensional and Macroporous Carbon Aerogel Microelectrode

摘要

A sensitive amperometric sensor is developed for selective determination of dopamine based onelectrocatalytic activity of graphene-based macroporous carbon aerogel microelectrode. Threedimensional carbon aerogel electrode was synthesized by freeze drying of graphene and multi-wallcarbon nanotubes with the assistance of Nifion. The performance and morphology of carbon aerogelelectrode were investigated using SEM, XPS, XRD, EDS and electrochemical characterization. Theexperimental results confirmed that the porous carbon aerogel displayed excellent electricalconductivity and strong electro-catalytic activity towards dopamine oxidation. DA sensor preparedwith the carbon aerogels displays rapid and sensitive electrochemical response with a detection limit of30 nM (S/N = 3). The results of DA determination in real samples verify the feasibility of the porouscarbon aerogel and potential application in biosensing and medical diagnosis.