Nanoporous cobalt oxide nanowires for non-enzymatic electrochemical glucose detection

Kang, Luqi; He, Daiping; Bie, Lili; Jiang, Ping

doi:10.1016/j.snb.2015.06.015

Cited by 114 publications

(35 citation statements)

References 33 publications

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“…Importantly, the poor performance of existing sensors in detecting Glu at near biological conditions, such as in an aqueous buffer at physiological pH, has limited the use of non-enzymatic Glu sensing systems in real-life applications. 23,[39][40][41][42][43] 7 Herein, we develop a low-cost and scalable one-pot approach to fabricate electrocatalytically active cobalt phosphate nanostructures (CPNs) under mild synthetic conditions. The CPNs are amorphous, exhibit high surface areas, and can catalyze the electrooxidation of Glu in aqueous buffer at physiological pH.…”

Section: Introductionmentioning

confidence: 99%

Cobalt Phosphate Nanostructures for Non-Enzymatic Glucose Sensing at Physiological pH

Tomanin

Cherepanov

Besford

et al. 2018

ACS Appl. Mater. Interfaces

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Nanostructured materials have great potential as platforms for analytical assays and catalytic reactions. Herein, we report the synthesis of electrocatalytically active cobalt phosphate nanostructures (CPNs) using a simple, low-cost, and scalable preparation method. The electrocatalytic properties of the CPNs toward the electrooxidation of glucose (Glu) were studied by cyclic voltammetry and chronoamperometry in relevant biological electrolytes, such as phosphate-buffered saline (PBS), at physiological pH (7.4). Using the CPNs, Glu detection could be achieved over a wide range of biologically relevant concentrations, from 1 to 30 mM Glu in PBS, with a sensitivity of 7.90 nA/mM cm 2 and a limit of detection of 0.3 mM, thus fulfilling the necessary requirements for human blood Glu detection. In addition, the CPNs showed a high structural and functional stability over time at physiological pH. The CPN-coated electrodes could also be used for Glu detection in the presence of interfering agents (e.g., ascorbic acid and dopamine) and in human serum. Density functional theory calculations were performed to evaluate the interaction of Glu with different faceted cobalt phosphate surfaces; the results revealed that specific surface presentations of undercoordinated cobalt led to the strongest interaction with Glu, suggesting that enhanced detection of Glu by the CPNs can be achieved by lowering the surface coordination of cobalt.Our results highlight the potential use of phosphate-based nanostructures as catalysts for electrochemical sensing of biochemical analytes.Potassium chloride (KCl, CAS no. 7440-09-7) was purchased from Chem-Supply. All the chemicals were used as received. High purity (Milli-Q) water with a resistivity of 18.2 MΩ cm was obtained from an inline Millipore RiOs/Origin water purification system.Instrumentation. X-ray photoelectron spectroscopy (XPS) spectra were acquired using an Axis Ultra X-ray photoelectron spectrometer (Kratos Analytical, UK), equipped with a 165 mm concentric hemispherical electron energy analyzer and a monochromated Al Kα incident Xray source (1486.6 eV). Survey (wide) scans were recorded in the binding energy range of 0-1200 eV, with 1.0 eV steps, a dwell time of 100 ms, and an analyzer pass energy of 160 eV.Multiplex (narrow) high-resolution spectra were recorded with a pass energy of 20 eV, with 0.05 eV steps, and a dwell time of 250 ms, resulting in an energy resolution (ΔE/E) of ~300 meV. The base pressure in the analysis chamber during data collection was 1-2 × 10 −9 mbar, and these data were processed using the software CasaXPS. All binding energies were calibrated using the C 1s level of adventitious carbon at 285.0 eV. Fourier transform infrared (FTIR) spectra were obtained on a Tensor II (Bruker) attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectrometer and analyzed using the software OPUS 7.8. The number of scans was 64. A minimum resolution of 4 cm −1 and the absorbance/transmittance mode were used. Scanning electron microscopy (SEM) images were o...

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Section: Introductionmentioning

confidence: 99%

Cobalt Phosphate Nanostructures for Non-Enzymatic Glucose Sensing at Physiological pH

Tomanin

Cherepanov

Besford

et al. 2018

ACS Appl. Mater. Interfaces

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“…As such, it is highly desirable to develop inexpensive and earth-abundant 3d transition metal based electrode materials for electrochemical glucose sensing. Transition metals such as copper, 11,12 cobalt, 13,14 and nickel 15,16 have served as effective electrode materials for fabrication of non-enzymatic electrochemical glucose sensors with high sensitivity and selectivity.…”

Section: Introductionmentioning

confidence: 99%

“…Copper oxide 19,20 and cobalt oxide 13,21 have attracted more attention for non-enzymatic glucose sensing because of their simple synthesis process, super electrochemical property and good chemical stability. Their mixed metal oxide CuCo 2 O 4 , obtained from replacing Co 2+ in Co 2+ (Co 2 ) 3+ O 4 spinel structure with Cu 2+ , exhibits higher electrical conductivity and electrochemical activity than their monometallic oxides.…”

Section: Introductionmentioning

confidence: 99%

CuCo₂O₄nanowire arrays supported on carbon cloth as an efficient 3D binder-free electrode for non-enzymatic glucose sensing

et al. 2017

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CuCo 2 O 4 nanowire arrays supported on carbon cloth (CuCo 2 O 4 NWAs/CC) were prepared via a simple hydrothermal synthesis and subsequent calcination process. As a 3D binder-free electrode for nonenzymatic glucose sensing, CuCo 2 O 4 NWAs/CC shows high sensing performance towards glucose under alkaline conditions, with a wide detection range from 1 mM to 0.93 mM, a low detection limit of 0.5 mM (S/N ¼ 3), and a high detection sensitivity of 3.93 mA mM À1 cm À2. Moreover, CuCo 2 O 4 NWAs/CC shows good selectivity in the presence of common interferents and good reproducibility for glucose detection, which make it a promising electrode material for sensitive determination of glucose in human samples.

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“…Research findings demonstrate that enzymatic catalysts exhibit high activity and excellent selectivity, but the unstable operating environment and fragile stability greatly hinder their practical applications [5,6]. To overcome these drawbacks, non-enzymatic catalysts (such as precious metal nanoparticles or alloys [7][8][9][10], composite materials [11,12], polymers [13,14] and transition metal oxides [15][16][17][18]) as enzyme mimics show higher performance than enzymatic ones. Among these non-enzymatic catalysts, transition metal oxides play important roles due to their high intrinsic catalytic performances, low cost, and environmental friendliness.…”

Section: Introductionmentioning

confidence: 99%

Rectangular flake-like mesoporous NiCo2O4 as enzyme mimic for glucose biosensing and biofuel cell

et al. 2017

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Nanoporous cobalt oxide nanowires for non-enzymatic electrochemical glucose detection

Cited by 114 publications

References 33 publications

Cobalt Phosphate Nanostructures for Non-Enzymatic Glucose Sensing at Physiological pH

Cobalt Phosphate Nanostructures for Non-Enzymatic Glucose Sensing at Physiological pH

CuCo₂O₄nanowire arrays supported on carbon cloth as an efficient 3D binder-free electrode for non-enzymatic glucose sensing

Rectangular flake-like mesoporous NiCo2O4 as enzyme mimic for glucose biosensing and biofuel cell

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Nanoporous cobalt oxide nanowires for non-enzymatic electrochemical glucose detection

Cited by 114 publications

References 33 publications

Cobalt Phosphate Nanostructures for Non-Enzymatic Glucose Sensing at Physiological pH

Cobalt Phosphate Nanostructures for Non-Enzymatic Glucose Sensing at Physiological pH

CuCo2O4nanowire arrays supported on carbon cloth as an efficient 3D binder-free electrode for non-enzymatic glucose sensing

Rectangular flake-like mesoporous NiCo2O4 as enzyme mimic for glucose biosensing and biofuel cell

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CuCo₂O₄nanowire arrays supported on carbon cloth as an efficient 3D binder-free electrode for non-enzymatic glucose sensing