Ultrasensitive Electrochemical Sensor for Maltol in Wines Using Graphene Oxide-Wrapped Amino-Functionalized Carbon Sphere as Sensing Electrode Materials

We reported an electrochemical sensor with specificity toward maltol with rapid response and high sensitivity, using graphene oxide (GO)-wrapped amino-functionalized carbon sphere (ACS) hybrids as the conductive channel. The results indicated that a well-organized structure was successfully prepared, based on specific electrostatic attractions between the ACS and the GO nanosheets. Next, a sensitive and selective electrochemical sensor was successfully constructed for the direct detection of maltol by casting a GO-ACS film onto the surface of a glassy carbon electrode. The oxidative peak current increased linearly with the concentration of maltol in the range of 0.1 mu M approximate to 0.8mM using differential pulse voltammetry, and the detection limit was 24nM with S/N=3.