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Composites Communications
Volume 25, 2021, 100687
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Highly sensitive enzyme-free glucose sensor based on CuO–NiO nanocomposites by electrospinning
Yanhong Xua, Yaping Dingb, Lihong Zhangc, Xinxin Zhangd
School of Materials Engineering, Xuzhou College of Industrial Technology, Xuzhou, 221140, Jiangsu Province, PR China.
Abstract
CuO–NiO nanocomposites have been prepared after calcining fiber mats at 450 °C by electrospinning technique. The samples are characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM) techniques. SEM micrographs depict regular nanofibers without beads. The XRD and TEM results confirm that as-synthesized materials are the composite nanoparticles composed of the crystal phases of CuO and NiO. An enzyme-free glucose sensor has been first fabricated with nanocomposites CuO–NiO-modified on glassy carbon electrode (GCE). Cyclic voltammetry and current-time curve techniques are mainly used to enlighten the electrochemical properties of the modified electrode (CuO–NiO/GCE) in alkaline aqueous solutions. Experimental parameters like applied potential and concentration of modifier on GCE have been optimized, and the analytical performances of as-fabricated biosensor for glucose determination have been investigated in detail. Under optimal conditions (8.0 μL modifier, +0.55 V), CuO–NiO/GCE exhibits excellent properties in glucose detection for the concentrations with a fast response (~1s), a low detection limit of 0.08 μM (S/N = 3), a wide range of 0.2 μM–1.0 mM with a linear correlation coefficient of 0.998 and a very high sensitivity of 4022 μA mM-1 cm-2. In addition CuO–NiO/GCE shows good selectivity, reproducibility and longtime stability. Excellent electrochemical catalytic performance for glucose demonstrates that as-synthesized nanocomposite CuO–NiO is an outstanding and promising electrode material toward glucose.
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