Synthesis of Polyaniline/Graphene Nanocomposites and Electrochemical Sensing Performance for Formaldehyde

2020 ◽  
Vol 16 (4) ◽  
pp. 493-498
Author(s):  
Lizhai Pei ◽  
Yue Ma ◽  
Fanglv Qiu ◽  
Feifei Lin ◽  
Chuangang Fan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Electrochemical Sensing ◽  
Polymerization Process ◽  
Great Effort ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Liquid Environment ◽  
Graphene Nanocomposites

Background: Formaldehyde has been recognized as the important liquid environmental pollutant which can cause health risk. Great effort has been devoted to detecting formaldehyde in liquid environment. It is of important significance to develop a sensitive method for measuring formaldehyde from the environmental and health viewpoints. Methods: Polyaniline/graphene nanocomposites have been prepared by a simple in-situ polymerization process using graphene and aniline as the raw materials. The nanocomposites were characterized by Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD) and Transmission Electron Microscopy (TEM) and high-resolution TEM (HRTEM). The polyaniline/graphene nanocomposites were applied to modify the glassy carbon electrode for the detection of formaldehyde by cyclic voltammetry (CV) method. Results: The polyaniline/graphene nanocomposites consist of hexagonal graphite phase. The polyaniline particles are dispersed and attached to the surface of the graphene nanosheet-shaped morphology. The thickness of the graphene nanosheets is less than 50 nm. The electrocatalytic performance of the polyaniline/graphene nanocomposites modified glassy carbon electrode towards formaldehyde was obtained. The potential of the irreversible oxidation peak is located at +0.19 V. The polyaniline/graphene nanocomposites modified glassy carbon electrode shows a wide linear range of 0.0001-2 mM and low detection limit of 0.085 μM. Conclusion: The nanocomposites modified glassy carbon electrode possesses good reproducibility and stability. The polyaniline/graphene nanocomposites show great application potential for the electrochemical sensors to detect formaldehyde in liquid environments.

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 Au-PDA@SiO2 core-shell nanospheres decorated rGO modified electrode for electrochemical sensing of cefotaxime

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
M. Z. H. Khan ◽  
M. Daizy ◽  
C. Tarafder ◽  
X. Liu
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Modified Electrodes ◽  
Core Shell ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Reduced Graphene

AbstractIn this work, we have successfully synthesized core-shell structured Au-PDA@SiO2 nanospheres and decorated on reduced graphene oxide (rGO) modified glassy carbon electrode for the electrochemical detection of cefotaxime. The one-pot hydrothermal method was used to synthesis core-shell nanostructures by loading Au nanoparticles on polydopamine (PDA) coated SiO2 nanospheres. The as-prepared Au-PDA@SiO2 nanospheres were used to fabricate electrochemically reduced graphene oxide (rGO) modified glassy carbon electrode (Au-PDA@SiO2/rGO/GCE) for electrochemical determination of cefotaxime. Scanning electron microscopy, powder x-ray diffraction, transmission electron microscopy, and Fourier-transform infrared spectroscopy were used to confirm the structure and morphology of the as-prepared nanospheres. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were performed for electrochemical characterizations different modified electrodes. It was revealed that the nanocomposite modified electrodes exhibited excellent electrochemical performances for electrooxidation of target analytes and could achieve ultra-sensitive detections. A linear relationship was observed between peak currents and concentrations in the ranges of 1.0 × 10−9 to 5.0 × 10−8 M (R2 = 0.9877), and 1.0 × 10−7 to 5.0 × 10−6 M (R2 = 0.9821) for cefotaxime with a detection limit (S/N = 3) of 1.0 × 10−10 M. It can be deduced that the proposed sensor is suitable for the sensitive detection of cefotaxime in pharmaceutical samples.

Highly Improved Electrooxidation of Captopril on Copper Hexacyanoferrate/Ordered Mesoporous Carbon-Modified Glassy Carbon Electrode

2014 ◽  
Vol 67 (6) ◽  
pp. 851 ◽  
Author(s):  
Shengjun Lu ◽  
Pan Lu ◽  
Cheng Li ◽  
Caihong Wang ◽  
Jie Yu
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Mesoporous Carbon ◽  
Electrochemical Polymerization ◽  
Ordered Mesoporous Carbon ◽  
Polymerization Process ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Copper Hexacyanoferrate ◽  
Ordered Mesoporous

Using an electrochemical polymerization process, a copper hexacyanoferrate/ordered mesoporous carbon-modified glassy carbon electrode (CuHCF/OMC/GCE) was prepared. The performance of CuHCF/OMC was compared with that of CuHCF and the properties of the new material were improved. A sensor for sensitive detection of captopril was developed based on CuHCF/OMC-modified glassy carbon electrode. The composition and morphology of the as-prepared CuHCF/OMC products were characterized by energy-dispersive X-ray spectroscopy and scanning electron microscopy. The electrochemical behaviour and electrocatalytic performance of the CuHCF/OMC-modified glassy carbon electrode towards the oxidation of captopril were evaluated by cyclic voltammetry. Results showed that the CuHCF/OMC-modified electrode exhibits two well-defined redox peaks. The linear range for the detection of captopril was from 1.0 × 10–5 to 2.7 × 10–3 M, with a correlation coefficient of 0.999, and the detection limit was 1.2 × 10–6 M based on a signal-to-noise ratio of 3.

Electrochemical sensing of etoposide using carbon quantum dot modified glassy carbon electrode

The Analyst ◽  
2016 ◽  
Vol 141 (9) ◽  
pp. 2665-2675 ◽  
Author(s):  
Hoai Viet Nguyen ◽  
Lukas Richtera ◽  
Amitava Moulick ◽  
Kledi Xhaxhiu ◽  
Jiri Kudr ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Carbon Quantum Dots ◽  
Electrochemical Sensing ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Carbon Quantum Dot

In this study, carbon quantum dots were used for enhancement of the electrochemical signals of etoposide.

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