One step synthesis of a Methylene Blue@ZIF 8 reduced graphene oxide nanocomposite and its application to electrochemical sensing of rutin
AbstractThe authors demonstrate the exploitation of reduced graphene oxide (RGO) as a template for immobilizing zeolitic imidazolate framework 8 (ZIF 8) crystals loaded with the electrochemical probe Methylene Blue (MB) The framework was deposited on the surface of RGO in a one pot process. Transmission electron microscopy, scanning electron microscopy and X ray diffraction were employed to characterize the nanocomposite. The electrochemical behavior of rutin at a glassy carbon electrode (GCE) modified with the nanocomposite was investigated by cyclic voltammetry and differential pulse voltammetry. The modified GCE displays high electrocatalytic activity toward rutin oxidation at a relatively low working potential (0.4 V vs. Ag/AgCl) Under the optimal conditions, the sensor has an amperometric response that is linear in the 0.1 to 100 mM rutin concentration range, with a 20 nM detection limit (at an S/N ratio of 3) The method was successfully applied to the determination of rutin in tablets and urine samples. Graphical abstractThe zeolitic imidazolate framework ZIF 8 was loaded with Methylene Blue and deposited on the surface of reduced graphene oxide. A glassy carbon electrode was modified with the nanocomposite and then used for the determination of rutin with a 20 nM detection limit and a linear range from 0.1 to 100 mM.
Microchimica Acta