Layer-by-layer assembly of copper nanoparticles and manganese dioxide-multiwalled carbon nanotubes film: A new nonenzymatic electrochemical sensor for glucose

Publication date: 1 March 2016
Source:Talanta, Volume 149
Author(s): Yan Wang, Sai Zhang, Wushuang Bai, Jianbin Zheng
A nonenzymatic glucose sensor based on Cu/MnO2/MWCNTs nanocomposite modified glass carbon electrode was fabricated by an electrochemical method. Transmission electron microscopic (TEM) measurement showed that MnO2 in the nanocomposite held a nanostructure of three-dimension (3D) spheres assembled by many densely arranged nanosheets. The electrocatalytic activity of the present sensor toward the oxidation of glucose was investigated by amperometry. The current response was linearly related to glucose concentration in a range from 6.4×10⁻⁷–2.0×10⁻³molL⁻¹ with a sensitivity of 494μAmM⁻¹cm⁻² and a correlation coefficient of 0.9990, and another range from 10 to 1000μM with a sensitivity of 1302μAmM⁻¹cm⁻² and a correlation coefficient of 0.9990. The detection limit was estimated to be 0.17μM at a signal-to-noise ratio of 3, and the response time was found to be 3s.

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