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 µM∼0.8 mM using differential pulse voltammetry, and the detection limit was 24 nM with S/N=3.