Ascorbic acid amperometric sensor using a graphene-wrapped hierarchical TiO2 nanocomposite

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...

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Bibliographic Details
Published inChemical papers Vol. 69; no. 5; pp. 655 - 661
Main Authors Fu, Li, Zheng, Yu-Hong, Fu, Zhu-Xian
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 2015
De Gruyter Open
Subjects
ascorbic acid
Biochemistry
Biotechnology
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Industrial Chemistry/Chemical Engineering
Materials Science
Medicinal Chemistry
nanocomposite
Original Paper
reduced graphene oxide
sensor
vitamin C
nanocomposite
ascorbic acid
sensor
reduced graphene oxide
vitamin C
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Summary: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.
ISSN:0366-6352
1336-9075
DOI:10.1515/chempap-2015-0079