Reduced graphene oxide-supported methylene blue nanocomposite as a glucose oxidase-mimetic for electrochemical
Shaojun Yang1, Daliang Liu1, Qing Bo Meng1
1Liaoning Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials, College of Chemistry, Liaoning University Shenyang 110036 China sywu@lnu.edu.cn songlab@lnu.edu.cn +86-24-62202378.
Abstract:
In this paper, a hybrid nanocomposite (MB-rGO) was synthesized based on the π-π stacking interactions between methylene blue (MB) and reduced graphene oxide (rGO). The as-synthesized nanocomposite was characterized by SEM, TEM, XRD, FTIR, UV-vis and XPS spectra. UV-vis spectroscopy and electrochemical tests suggested the MB-rGO modified on the electrode exhibited glucose oxidase-mimetic catalytic activity towards glucose, and displayed excellent electrocatalytic performance for electrochemical detection of glucose with a wide linear range from 1.04 to 17.44 mM, a low detection limit of 45.8 μM and a large sensitivity of 13.08 μA mM-1 cm-2. The proposed glucose sensor also showed high stability, reproducibility and good abilities of anti-interference to dopamine, ascorbic acid and uric acid. Moreover, the modified electrode was used to determine glucose concentration in human blood serum samples with satisfactory results.
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