Ascorbic acid amperometric sensor using a graphene-wrapped hierarchical TiO2 nanocomposite
| Autor: | Yuhong Zheng, Zhuxian Fu, Li Fu |
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| Rok vydání: | 2015 |
| Předmět: |
Detection limit
Materials science Nanocomposite Graphene Scanning electron microscope General Chemical Engineering Inorganic chemistry General Chemistry Ascorbic acid Biochemistry Industrial and Manufacturing Engineering Amperometry law.invention law Electrode Materials Chemistry Cyclic voltammetry Nuclear chemistry |
| Zdroj: | Chemical Papers. 69 |
| ISSN: | 1336-9075 0366-6352 |
| Popis: | An ascorbic acid (AA) amperometric sensor was fabricated based on a glassy carbon electrode (GCE) modified with a reduced graphene oxide-wrapped hierarchical TiO2 (RGO—TiO2) nanocomposite. The RGO—TiO2 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 TiO2 provide the electrode with higher current response and lower oxidation potential compared with those of bare GCE and TiO2 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. |
| Databáze: | OpenAIRE |
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