Non-enzymatic Glucose Sensor Based on the Electrospun Porous Foamy Copper Oxides Micro-nanofibers†

doi:10.7503/cjcu20180854

Abstract

Abstract:

A non-enzymatic glucose sensor using novel porous foamy CuO micro-nanofibers was fabricated through electrospinning and subsequent calcination. Scanning electron microscopy(SEM), Fourier transform infrared spectrum(FTIR) and X-ray differaction(XRD) techniques were used for the morphology and structural characterization of CuO nanostructures. CuO micro-nanofibers are highly dense, uniform, and exhibited good crystalline array structure. Most of all, the product presents a special rough foamy morphology with many pores, which help to enlarge the specific surface area thereby enhancing the activity of electrooxidation of glucose. The prepared CuO micro-nanofibers were subsequently used to modify a glassy carbon electrode and then detailed investigated for direct electrocatalytic oxidation of glucose through cyclic voltammetry and chronoamperometry. The results manifest that the modified electrode has a good sensitivity of 6.17 μA·L·mmol^-1·cm^-2 and a low detection limit of 65.3 μmol/L. Moreover, it exhibits a good antiinterference to ascorbic acid(AA), uric acid(UA) and ethanol as well. The improved performances were ascribed to the high surface-to-volume ratio and the special morphology. Therefore, it concluded that the porous foamy CuO micro-nanofibers can be a promising non-enzyme glucose sensor.

Key words: Electrospinning, Porous foamy CuO micro-nanofiber, Non-enzyme glucose sensor

CLC Number:

O631

TrendMD:

WANG Yongpeng,XU Zibo,LIU Mengzhu,ZHANG Haibo,JIANG Zhenhua. Non-enzymatic Glucose Sensor Based on the Electrospun Porous Foamy Copper Oxides Micro-nanofibers^†[J]. Chem. J. Chinese Universities, 2019, 40(6): 1310.

Figures/Tables 10

Fig.1 SEM images of PVP/Cu(CH3COO)2 composite nanofibers before(A) and after(B) calcination at 600 ℃ for 4 h

Scheme 1 Possible formation mechanism of the porous foamy morphology

Fig.2 TGA(A) and DSC(B) curves of PVP nanofibers(a) and PVP/Cu(CH3COO)2 composite nanofibers(b)

Fig.3 FTIR spectra of PVP/Cu(CH3COO)2 composite nanofibers before(a) and after(b) calcination at 600 ℃ for 4 h

Fig.4 XRD pattern of PVP/Cu(CH3COO)2 composite nanofibers after calcination at 600 ℃ for 4 h

Fig.5 CV curves of PVP-CuO-NFs-GCE in different solution at 50 mV/s a. 0.1 mol/L NaOH; b. 0.1 mol/L NaOH+0.4 mmol/L glucose; c. 0.1 mol/L NaOH+0.8 mmol/L glucose.

Scheme 2 Schematic representation of the glucose sensing mechanism of PVP-CuO-NFs-GCE

Fig.6 Amperometric response of PVP-CuO-NFs-GCE with successive additions of 0.1 mmol/L glucose to 0.1 mol/L NaOH at 0.40 V(A) and its calibration curve(B)

Table 1 Comparison of the present PVP-CuO-NFs-GCE with other non-enzymatic glucose sensors*

Electrode matrix	Sensitivity/ (μA·L·mmol^-1·cm^-2)	LOD/ (μmol·L^-1)	Linear range/ (mmol·L^-1)	Ref.
Pt nanoflowers/graphene oxide/GCE	1.26(lower)	2	0.002―10.3	[23]
	0.64(higher)		10.3―20.3	[23]
Pt-Pd nanoparticles/onion-like mesoporous carbon/Nafion/GCE	0.11	120	1.5―12	[24]
Au nanoflowers/phosphorus doped diamond-like carbon	20	150	0.3―30	[25]
film on Si substrate
CNT with bimetallic Pt-M(M=Ru and Sn)/GCE	0.81	5000	5.00―100	[26]
	0.81	3000	3.00―100
Cu-CuO nanowalls/GCE	0.5563	0.05	5×10^-5―10^-2	[27]
Mesoporous CuO/GCE	0.08	—	30―160	[28]
	0.04	—	170―310
PVP-CuO-NFs-GCE	6.17	65.3	Up to 1 mmol/L	This work

Fig.7 Amperometric responses of PVP-CuO-NFs-GCE with successive additions of 3 mmol/L glucose, 0.1 mmol/L AA, 0.1 mmol/L UA, 10 mmol/L ethanol to 0.1 mmol/L NaOH at 0.40 V

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