Few-wall carbon nanotubes covalently functionalized by ferrocene groups for bioelectrochemical devices.

2012 ◽  
Vol 1451 ◽  
pp. 111-116
Author(s):  
Naoual Allali ◽  
Veronika Urbanova ◽  
Victor Mamane ◽  
Jeremy Waldbock ◽  
Mathieu Etienne ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electron Transfer ◽  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Carbon Electrode ◽  
Ferrocene Derivatives ◽  
Covalent Functionalization ◽  
Side Walls ◽  
Chemical Groups

ABSTRACTThe present work reports the covalent functionalization of few-wall CNTs (FWCNTs) by ferrocene derivatives to i) improve their dispersion efficiency in water and ii) to graft electroactive chemical groups on their side-walls in order to promote electron transfer to biomolecules. The functionalized CNTs (f-CNTs) are used to modify a glassy carbon electrode and this modified electrode is used for oxidizing the cofactor NADH (dihydronicotinamide adenine dinucleotide).

scholarly journals Electrochemical Determination of Trace Pb (II) by The Modified Glassy Carbon Electrode Compositing MultiWalled Carbon Nanotubes-Nafion-Bi Film

2020 ◽  
pp. 1-12
Keyword(s):  
Carbon Nanotubes ◽  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Anodic Stripping Voltammetry ◽  
Electrochemical Sensing ◽  
Carbon Electrode ◽  
Bismuth Film ◽  
Modified Glassy Carbon Electrode

A modified glassy carbon electrode (GCE) compositing multi-walled carbon nanotubes (MWCNTs), Nafion and bismuth film was prepared and applied for the sensitive detection of trace Pb (II). MWCNTs were dispersed into ethanol by ultrasonication in the presence of Nafion and the nanotubes are coated onto the bare GCE. After that, an extra Nafion adhesion agent is added to the electrode. By the in situ plating, a bismuth film was fabricated on the MWCNTs-NA/GCE, making the desired electrode, MWCNTs-NA-Bi/GCE. The modified electrode was characterized by differential pulse anodic stripping voltammetry, scanning electron microscopy, and cyclic voltammetry. A deposition potential of –1.4 V (vs. Ag/AgCl) and a deposition time of 300 s were applied to the working electrode under stirred conditions after optimizing. Nanotubes and Nafion concentrations and pH were carefully optimized to determine trace lead ions by using the electrode as an electrochemical-sensing platform. Nafion effectively increased the stability and adhesivity of the composite film. The MWCNTs-NA-Bi film modified electrode can remarkably increase the anodic peak current of Pb2+. The sensitivity of MWCNTs-NA-Bi/GCE is 4.35 times higher than that of the bare GCE with bismuth film. The prepared electrode showed excellent stability and reproducibility and can be applied for determination of Pb2+ contained wastewater.

scholarly journals Glucose Oxidase Immobilized on a Functional Polymer Modified Glassy Carbon Electrode and Its Molecule Recognition of Glucose

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 115 ◽  
Author(s):  
Yan-Na Ning ◽  
Bao-Lin Xiao ◽  
Nan-Nan Niu ◽  
Ali Moosavi-Movahedi ◽  
Jun Hong
Keyword(s):  
Carbon Nanotubes ◽  
Electron Transfer ◽  
Glucose Oxidase ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Functional Polymer ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

In the present study, a glucose oxidase (GluOx) direct electron transfer was realized on an aminated polyethylene glycol (mPEG), carboxylic acid functionalized multi-walled carbon nanotubes (fMWCNTs), and ionic liquid (IL) composite functional polymer modified glassy carbon electrode (GCE). The amino groups in PEG, carboxyl groups in multi-walled carbon nanotubes, and IL may have a better synergistic effect, thus more effectively adjust the hydrophobicity, stability, conductivity, and biocompatibility of the composite functional polymer film. The composite polymer membranes were characterized by cyclic voltammetry (CV), ultraviolet-visible (UV-Vis) spectrophotometer, fluorescence spectroscopy, electrochemical impedance spectroscopy (EIS), and transmission electron microscopy (TEM), respectively. In 50 mM, pH 7.0 phosphate buffer solution, the formal potential and heterogeneous electron transfer constant (ks) of GluOx on the composite functional polymer modified GCE were −0.27 V and 6.5 s−1, respectively. The modified electrode could recognize and detect glucose linearly in the range of 20 to 950 μM with a detection limit of 0.2 μM. The apparent Michaelis-Menten constant (Kmapp) of the modified electrode was 143 μM. The IL/mPEG-fMWCNTs functional polymer could preserve the conformational structure and catalytic activity of GluOx and lead to high sensitivity, stability, and selectivity of the biosensors for glucose recognition and detection.

A novel modified electrode based on terbium oxide and carbon nanotubes for the simultaneous determination of methyldopa and paracetamol

2016 ◽  
Vol 8 (23) ◽  
pp. 4711-4719 ◽  
Author(s):  
Aysegul Kutluay Baytak ◽  
Sehriban Duzmen ◽  
Tugce Teker ◽  
Mehmet Aslanoglu
Keyword(s):  
Carbon Nanotubes ◽  
Simultaneous Determination ◽  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Carbon Electrode ◽  
Terbium Oxide ◽  
Sensing Platform ◽  
Voltammetric Sensing

A novel voltammetric sensing platform was prepared ultrasonically by modifying a glassy carbon electrode (GCE) with a composite of terbium oxide (Tb4O7NPs) nanoparticles and carbon nanotubes (CNTs) for the simultaneous determination of methyldopa (MD) and paracetamol (PR).

scholarly journals Amperometric determination of sulfide ion by glassy carbon electrode modified with multiwall carbon nanotubes and copper (II) phenanthroline complex

2014 ◽  
Vol 12 (10) ◽  
pp. 1091-1099 ◽  
Author(s):  
Mojtaba Shamsipur ◽  
Mahmoud Roushani ◽  
Seied Pourmortazavi ◽  
Nahid Shahabadi
Keyword(s):  
Carbon Nanotubes ◽  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Limit Of Detection ◽  
Multiwall Carbon Nanotubes ◽  
Carbon Electrode ◽  
Amperometric Determination ◽  
Sulfide Ion ◽  
Multiwall Carbon

AbstractElectrocatalytic oxidation of sulfide ion on a glassy carbon electrode (GCE) modified with multiwall carbon nanotubes (MWCNTs) and a copper (II) complex was investigated. The Cu(II) complex was used due to the reversibility of the Cu(II)/Cu(III) redox couple. The MWCNTs are evaluated as a transducer, stabilizer and immobilization matrix for the construction of amperometric sensor based on Cu(II) complex adsorbed on MWCNTs immobilized on the surface of GCE. The modified GCE was applied to the selective amperometric detection of sulfide at a potential of 0.47 V (vs. Ag/AgCl) at pH 8.0. The calibration graph was linear in the concentration range of 5 µM–400 µM; while the limit of detection was 1.2 µM, the sensitivity was 34 nA µM−1. The interference effects of SO3 2−, SO4 2−, S2O3 2−, S4O6 2−, Cysteine, and Cystein were negligible at the concentration ratios more than 40 times. The modified electrode is more stable with time and more easily restorable than unmodified electrode surface. Also, modified electrode permits detection of sulfide ion by its oxidation at lower anodic potentials.

Electrochemical Study of Pyrene on Glassy Carbon Electrode Modified with Metal-Oxide Nanoparticles and Graphene Oxide/Multi-Walled Carbon Nanotubes Nanoplatform

2016 ◽  
Vol 44 ◽  
pp. 158-195
Author(s):  
Diseko Boikanyo ◽  
Abolanle S. Adekunle ◽  
Eno E. Ebenso
Keyword(s):  
Carbon Nanotubes ◽  
Electron Transfer ◽  
Graphene Oxide ◽  
Glassy Carbon Electrode ◽  
Rate Constant ◽  
Glassy Carbon ◽  
Limit Of Detection ◽  
Carbon Electrode ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

This work describes and compares the electron transport and electrocatalytic properties of chemically synthesised cobalt oxide (Co3O4) and nickel oxide (NiO) nanoparticles grafted onto graphene oxide (GO)/acid treated multi-walled carbon nanotubes decorated glassy carbon electrode. Successful synthesis of these nano materials was confirmed using microscopic and spectroscopic techniques. Successful modification of electrode was confirmed using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Results showed that the GCE-fMWCNT-NiO and GCE-fMWCNT- Co3O4 nanocomposite modified electrodes gave faster electron transfer process in both 5 mM Ferri/Ferro ([Fe(CN)6]3−/4−) redox probe and 0.1 M phosphate buffer solution (PBS). GCE-fMWCNT-NiO and GCE-fMWCNT-Co3O4 electrodes also gave enhanced Pyrene oxidation current compared with bare GCE and other electrodes studied. The charge transfer resistance, electron transfer rate constant (ks), Tafel value, limit of detection (LoD), sensitivity, adsorption equilibrium constant (β), Gibbs free energy change due to the adsorption (ΔGoads) of Pyrene onto the GCE-fMWCNT-Co3O4 are established and discussed. The LoD and ΔGoads for Pyrene were 1.62 nM and -15.8 kJ/mol, respectively, over a linear dynamic range of 1.0 x 10-9 – 100 x 10-9 M. The electro-oxidation of Pyrene was a diffusion dominated process, but demonstrated adsorption thought to be as a result of a combination of the strong pi-pi electron interactions between Pyrene and the MWCNT, thus the thin film formed on the surface of the electrode by the analyte and its reaction intermediates. The LoD compared favourably with literature reported values. GCE-fMWCNT-Co3O4 gave better performance to Pyrene electrooxidation, good resistance to electrode fouling, higher catalytic rate constant and lower limit of detection. The sensor is easy to fabricate, cost effective and could be used for routine determination of Pyrene in food and environmental matrices.

scholarly journals Electrochemical Determination of Capsaicinoids Content in Soy Sauce and Pot-Roast Meat Products Based on Glassy Carbon Electrode Modified with Β-Cyclodextrin/Carboxylated Multi-Wall Carbon Nanotubes

Foods ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 1743
Author(s):  
Qianhui Gu ◽  
Chaoqun Lu ◽  
Kangwen Chen ◽  
Xingguang Chen ◽  
Pengfei Ma ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrochemical Sensor ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Meat Products ◽  
Soy Sauce ◽  
Relative Dispersion ◽  
Carbon Electrode ◽  
Trace Detection ◽  
Multi Wall Carbon Nanotubes

The rapid quantification of capsaicinoids content is very important for the standardization of pungent taste degree and flavor control of soy sauce and pot-roast meat products. To rapidly quantify the capsaicinoids content in soy sauce and pot-roast meat products, an electrochemical sensor based on β-cyclodextrin/carboxylated multi-wall carbon nanotubes was constructed and the adsorptive stripping voltammetry method was used to enrich samples in this study. The results showed that the excellent performance of the established electrochemical sensor was mostly because β-cyclodextrin caused the relative dispersion of carboxylated multi-wall carbon nanotubes on the glassy carbon electrode surface. Capsaicin and dihydrocapsaicin had similar electrochemical behavior, so the proposed method could determine the total content of capsaicinoids. The linearity of capsaicinoids content was from 0.5 to 100 μmol/L and the detection limit was 0.27 μmol/L. The recovery rates of different capsaicinoids content were between 83.20% and 136.26%, indicating the proposed sensor could realize trace detection of capsaicinoids content in sauce and pot-roast meat products. This work provides a research basis for pungent taste degree standardization and flavor control in the food industry.

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