Nghiên cứu tổng hợp điện cực in biến tính graphene phân tích Sunset yellow trong nước giải khát

A facile approach for preparation of reduced graphene oxide (ERGO) modified screen-printed carbon electrode (SPCE) was described using a direct electrochemical reduction of graphene oxide. As graphene modified surfaces were characterized using scanning electron microscopy (SEM) and cyclic voltammetry. The ERGO/SPCE sensor exhibited a remarkable enhancement of sensitivity towards Sunset yellow detection with the respect to unmodified SPCE. Using different pulse voltammetry (DPV), the peak current of the Sunset yellow was linearly increased toward SY concentration varying from 20- 1000 nM (R2 = 0.997) and limit of detection was estimated to 0.46 nM. This sensor was used to SY determination in soft drinks. The SY concentration in real samples is in good agreement with those determined by other electrochemical sensors developed in our laboratory. This result demonstrated that such simple modification process could be successfully applied to cheap SPCE to prepare highly sensitive modified SPCE sensor for monitoring other colorants and hazardous in foods as well as environment.