Preparation and Glucose Sensing Property of Core-shelled Nikel Oxide/Carbon Microspheres

doi:10.15541/jim20140391

Abstract

Abstract:

By using carbon spheres as a template, precursor Ni(OH)₂/C were prepared by a hydrothermal synthesis technology with the reaction of hexahydrate nickel chloride and urea. And then the precursor was calcinated in pure nitrogen to obtain core-shelled NiO/C microspheres. Scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray energy dispersive (EDX), and the thermo gravimetric analyzer (TGA) were used to characterize morphology and structure of the samples. Results show that the NiO/C microspheres have core-shell structure with diameter around 1.4 μm, carbon sphere as the core, and cubic NiO nanoplates with thickness of 50 nm as the shell. Electrochemical behavior and sensing property of core-shelled NiO/C microspheres were studied via cyclic voltammetry and amperometric method. The results displayed that glucose sensitivity of the NiO/C is 31.37 mA/(mmol·L^-1·cm²) better than that of NiO, among the linear range of 2-1279 μmol/L with detecting limit at 2 μmol/L. Furthermore, the core-shelled NiO/C microspheres exhibit good stability and anti-interference ability.

Key words: core-shelled structure, NiO/C flower-like microsphere, glucose, electrochemical sensor

CLC Number:

O614
O657

CUI Zhen-Zhen, YIN Hao-Yong, ZHAO Hong-Ting, NIE Qiu-Lin. Preparation and Glucose Sensing Property of Core-shelled Nikel
Oxide/Carbon Microspheres[J]. Journal of Inorganic Materials, 2015, 30(3): 305-310.

Figures/Tables 9

Fig. 1 TGA curves of Ni(OH)2/C (a) and Ni(OH)2 (b)

Fig. 2 SEM images of carbon spheres(a) and NiO/C samples at different magnifications (b, c)

Fig. 3 XRD pattern of NiO/C

Fig. 4 EDX patterns of NiO/C (a), NiO/C obtained with half amount of NiCl2· 6H2O and urea (b)

Fig. 5 CV curves of GCE, NiO/GCE and NiO/C/GCE in potassium ferricyanide

Fig. 6 CV curves of electrodes GCE (a), NiO/GCE (b) and NiO/C/GCE (c) in 5 mmol/L glucose

Fig. 7 The i-t curves of NiO/C(a) and NiO (b) glucose sensors

Fig. 8 Linear calibration of NiO/C sensor between current response and glucose concentration

Fig. 9 Interference tests of NiO/C glucose sensor

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