Journal
BIOSENSORS & BIOELECTRONICS
Volume 75, Issue -, Pages 161-165Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2015.08.024
Keywords
NiCo2O4; Polyaniline; Core-shell; Glucose sensor
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Funding
- Programme of Introducing Talents of Discipline to Universities 111 project of China [B08040]
- State Key Laboratory Solidification Processing in NWPU [SKLSP201417]
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In this work, the core-shell structure of NiCo2O4@Polyaniline (NiCo2O4@PANI) nanocomposite is fabricated via a facile hydrothermal treatment followed by a post-Polyaniline (PANI) coating process. The synthesized materials are characterized by Transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Raman spectrometer. The biosensing properties of NiCo2O4@PANI composite and NiCo2O4 nanoparticles toward glucose are studied based on glassy carbon electrode. Electrochemical studies indicate that the obtained core-shell NiCo2O4@PANI composite shows higher electrocatalytic activity toward the oxidation of glucose, compared with NiCo2O4 nanoparticles. The enhanced performance is related to the core-shell structure of NiCo2O4@PANI composite and the outstanding conductivity of the polyaniline shell. At a potential of +0.5 V, the NiCo2O4@PANI nanocomposite modified glass carbon electrode demonstrates a wide linear range up to 4.7350 mM with sensitivity of 4.55 mA mM(-1) cm(-2) and detection limit of 0.3833 mu M. It also shows significant electrochemical stability, good reproducibility and excellent selectivity. The results suggest that the NiCo2O4@PANI nanocomposite is a promising electrode material for electrochemical biosensor. (C) 2015 Elsevier B.V. All rights reserved.
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