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An ascorbic acid (AA) amperometric sensor was fabricated based on a glassy carbon electrode (GCE) modified with a reduced graphene oxide-wrapped hierarchical TiO 2  (RGO-TiO 2 ) nanocomposite. The RGO-TiO 2  nanocomposite was synthesized via the facial wet chemical method and characterized by scanning electron microscopy and X-ray diffraction. Cyclic voltammetry and amperometric techniques were employed to investigate its electrocatalytic performance towards the AA oxidation. The combined advantages of RGO and TiO 2  provide the electrode with higher current response and lower oxidation potential compared with those of bare GCE and TiO 2  modified GCE. The proposed electrode can be used for the determination of AA in the wide concentration range from 1 to 1500 μM with the detection limit of 0.5 μM. The proposed electrode was successfully used to determine AA in vitamin C tablets and spiked fruit juice.

Ascorbic acid amperometric sensor using a graphene-wrapped hierarchical TiO 2 nanocomposite