Construction and Application of Sunset Yellow Electrochemical Sensor Based on Graphene Oxide@ZIF-67 Heterostructure Nanocomposite
In this work,the reduced graphene oxide@ZIF-67 heterogeneous material(rGO@ZIF-67)was prepared via in-situ synthesis and used to develop an electrochemical sensor for detection of sunset yellow(SY).The electrochemical behavior of SY on this sensor was systemically studied by the method of cyclic voltammetry and differential pulse voltammetry.The synergistic effect of rGO and ZIF-67 enhanced the electroactive surface area and electron transport capacity of the sensor owning to the porous structure of MOF and outstanding conductivity of rGO,and thus improved the response signal of SY.Under the optimal conditions,the response current displayed an excellent linear relationship at the concentration range from 0.05 to 30.0 μmol/L with the detection limit of 20.0 nmol/L.The method has been successfully applied to the determination of SY in beverages.The developed strategy of SY monitoring is envisioned as a promising candidate in drinks analysis and is expected to expand the application of rGO@ZIF-67 heterogeneous materials in electrochemical sensors.
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