Au@Cu2O core-shell structure for high sensitive non-enzymatic glucose sensor

Su, Ya Qiong; Guo, Hua; Wang, Zuoshang; Long, Youwen; Li, Weifeng; Tu, Yifeng

doi:10.1016/j.snb.2017.09.056

Cited by 197 publications

(77 citation statements)

References 42 publications

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“…Lack of the long term stability of the enzyme and difficult immobilization procedure are the major ones. Thus, there is a large class of non-enzymatic devices based on glucose oxidation on the surface of various metals and metal oxides, such as Pt, Pd, Ag, Cu x O y [11,12,13,14,15]. Gold is one of the metals that is frequently used in constructing glucose sensors mainly because of its biocompatibility [16] and resistance to surface poisoning in both neutral and alkaline environment [17].…”

Section: Introductionmentioning

confidence: 99%

A Flexible Nafion Coated Enzyme‐free Glucose Sensor Based on Au‐dimpled Ti Structures

et al. 2019

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The detection of glucose at low concentrations using electrochemical sensors is of great importance due to the possibility of using different human body fluids than blood, such as e. g. urine, saliva, sweat or tears. The interest behind those biofluids is related to their utility in non‐invasive sugar determination. In this work, we present flexible, fully biocompatible electrode material based on Au nanoparticles immobilized onto titanium dimples. Au−Ti heterostructures were obtained via electrochemical anodization of titanium foil in presence of fluoride anions followed by chemical etching, magnetron sputtering of gold and subsequent thermal dewetting in continuous regime. In the last step of fabrication, electrodes were modified by permselective Nafion membrane. The selection of the best electrode material among different configurations was carried out basing on the electrochemical activity in the contact with 5 mM glucose dissolved in neutral air‐saturated 0.1 M PBS. For the 10 nm Au dewetted gold film, limit of detection of 30 μM and high sensitivity of 93 mA cm−2 mM−1 were achieved. Application of Nafion membrane caused complete inhibition of the impact of various interference species onto the glucose detection. Good selectivity and repeatability combined with the resistance to prolonged mechanical stress suggest that prepared material can be used in non‐invasive glucose sensing.

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Section: Introductionmentioning

confidence: 99%

A Flexible Nafion Coated Enzyme‐free Glucose Sensor Based on Au‐dimpled Ti Structures

et al. 2019

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“…Among various metal oxides, cuprous oxide (Cu 2 O), an easily-obtained, intrinsic p-type semiconductor with a band gap of 2.17 eV [21], has been used in many applications such as photovoltaic [22], photocatalysis and solar cells [23]. It has also been applied in electrochemical sensing [24] and related fields because of its electrocatalytic activity, low environmental impact, and low cost.…”

Section: Introductionmentioning

confidence: 99%

Enzyme‐free Cu₂O@MnO₂/GCE for Hydrogen Peroxide Sensing

et al. 2019

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A novel composite material of copper (I) oxide at manganese (IV) oxide (Cu 2 O@MnO 2 ), was synthesized and applied for modification on the glassy carbon electrode (GCE) surface (Cu 2 O@MnO 2 /GCE) as a hydrogen peroxide (H 2 O 2 ) sensor. The composite material was characterized regarding its structural and morphological properties, using field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The Cu 2 O@MnO 2 /GCE showed an excellent electrocatalytic response to the oxidation of H 2 O 2 which provided a 0.56 s À1 charge transfer rate constant (K s ), 1.65 3 10 À5 cm 2 s À1 diffusion coefficient value (D), 0.12 mm 2 electroactive surface area (A e ) and 1.04 3 10 À8 mol cm À2 surface concentration (g). At the optimal condition, the constructed sensor exhibited a wide linear range from 0.5 mM to 20 mM with a low limit of detection (63 nM, (S/N = 3) and a good sensitivity of 256.33 mA mM À1 cm À2 . It also presented high stability (DI response AE 15 %, n = 100), repeatability (1.25 %RSD, n = 10) and reproducibility (3.55 %RSD, n = 10). The results indicated that the synthesized Cu 2 O@MnO 2 was successfully used as a new platform for H 2 O 2 sensing.

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“…In our previous reports, a series of metal oxides–graphene nanocomposite-modified GCEs have been developed for the sensitive detection of dopamine and vanillin [ 19 , 20 , 21 ]. In these nanocomposite systems, various metal oxides, used as the main functional materials, such as Fe 3 O 4 , Fe 2 O 3 , MnO 2 , and Cu 2 O, show good electrocatalytic activities in electrochemical analyses [ 22 , 23 , 24 , 25 ]. The detection sensitivity was enhanced greatly because these semiconductors offer more active reaction sites for the analyses.…”

Section: Introductionmentioning

confidence: 99%

Sensitive and Selective Detection of Tartrazine Based on TiO2-Electrochemically Reduced Graphene Oxide Composite-Modified Electrodes

Liu

et al. 2018

Sensors

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TiO2-reduced graphene oxide composite-modified glassy carbon electrodes (TiO2–ErGO–GCE) for the sensitive detection of tartrazine were prepared by drop casting followed by electrochemical reduction. The as-prepared material was characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). Cyclic voltammetry and second-order derivative linear scan voltammetry were performed to analyze the electrochemical sensing of tartrazine on different electrodes. The determination conditions (including pH, accumulation potential, and accumulation time) were optimized systematically. The results showed that the TiO2–ErGO composites increased the electrochemical active area of the electrode and enhanced the electrochemical responses to tartrazine significantly. Under the optimum detection conditions, the peak current was found to be linear for tartrazine concentrations in the range of 2.0 × 10−8–2.0 × 10−5 mol/L, with a lower detection limit of 8.0 × 10−9 mol/L (S/N = 3). Finally, the proposed TiO2–ErGO–GCEs were successfully applied for the detection of trace tartrazine in carbonated beverage samples.

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Au@Cu2O core-shell structure for high sensitive non-enzymatic glucose sensor

Cited by 197 publications

References 42 publications

A Flexible Nafion Coated Enzyme‐free Glucose Sensor Based on Au‐dimpled Ti Structures

A Flexible Nafion Coated Enzyme‐free Glucose Sensor Based on Au‐dimpled Ti Structures

Enzyme‐free Cu₂O@MnO₂/GCE for Hydrogen Peroxide Sensing

Sensitive and Selective Detection of Tartrazine Based on TiO2-Electrochemically Reduced Graphene Oxide Composite-Modified Electrodes

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Au@Cu2O core-shell structure for high sensitive non-enzymatic glucose sensor

Cited by 197 publications

References 42 publications

A Flexible Nafion Coated Enzyme‐free Glucose Sensor Based on Au‐dimpled Ti Structures

A Flexible Nafion Coated Enzyme‐free Glucose Sensor Based on Au‐dimpled Ti Structures

Enzyme‐free Cu2O@MnO2/GCE for Hydrogen Peroxide Sensing

Sensitive and Selective Detection of Tartrazine Based on TiO2-Electrochemically Reduced Graphene Oxide Composite-Modified Electrodes

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Enzyme‐free Cu₂O@MnO₂/GCE for Hydrogen Peroxide Sensing