Magnetic Fe3O4@MOFs decorated graphene nanocomposites as novel electrochemical sensor for ultrasensitive detection of dopamine

RSC Advances ◽  
2015 ◽  
Vol 5 (119) ◽  
pp. 98260-98268 ◽  
Author(s):  
Yang Wang ◽  
Yun Zhang ◽  
Chen Hou ◽  
Mingzhu Liu
Keyword(s):  
Electrochemical Sensor ◽  
Ultrasensitive Detection ◽  
Hybrid Nanocomposite ◽  
Graphene Nanocomposites ◽  
Magnetic Fe3o4

A novel hybrid nanocomposite of magnetic Fe3O4@ZIF-8 decorated reduced graphite was prepared and used to determination of dopamine.

scholarly journals Novel Electrochemical Sensor Fabricated for Individual and Simultaneous Ultrasensitive Determination of Olaquindox and Carbadox Based on MWCNT-OH/CMK-8 Hybrid Nanocomposite Film

Molecules ◽  
2019 ◽  
Vol 24 (17) ◽  
pp. 3041 ◽  
Author(s):  
Yanqing Liu ◽  
Gengxin Hu ◽  
Hongwu Wang ◽  
Su Yao ◽  
Yinjian Ye
Keyword(s):  
Electrochemical Sensor ◽  
Simultaneous Determination ◽  
Modified Electrode ◽  
Electrochemical Impedance ◽  
Modified Electrodes ◽  
Differential Pulse ◽  
Hybrid Nanocomposite ◽  
Experimental Conditions ◽  
Linear Relationships

A hybrid nanocomposite consisting of hydroxylated multi-walled carbon nanotubes (MWCNTs−OH) and cube mesoporous carbon (CMK−8) was applied in this study to construct an MWCNT−OH/CMK−8/gold electrode (GE) electrochemical sensor and simultaneously perform the electro-reduction of olaquindox (OLA) and carbadox (CBX). The respective peak currents of CBX and OLA on the modified electrode increased by 720- and 595-fold relative to the peak current of GE. The performances of the modified electrode were investigated with electrochemical impedance spectroscopy, cyclic voltammetry, and differential pulse voltammetry. Then, the modified electrodes were used for the individual and simultaneous determination of OLA and CBX. The fabricated sensor demonstrated a linear response at 0.2–500 nmol/L in optimum experimental conditions, and the detection limits were 104.1 and 62.9 pmol/L for the simultaneous determination of OLA and CBX, respectively. As for individual determination, wide linear relationships were obtained for the detected OLA with levels of 0.05–500 nmol/L with LOD of 20.7 pmol/L and the detected CBX with levels of 0.10–500 nmol/L with LOD of 50.2 pmol/L. The fabricated sensor was successfully used in the independent and simultaneous determination of OLA and CBX in spiked pork samples.

scholarly journals A hybrid nanocomposite of CeO2–ZnO–chitosan as an enhanced sensing platform for highly sensitive voltammetric determination of paracetamol and its degradation product p-aminophenol

RSC Advances ◽  
2019 ◽  
Vol 9 (28) ◽  
pp. 15986-15996 ◽  
Author(s):  
Noor B. Almandil ◽  
Mohamed Ibrahim ◽  
Hossieny Ibrahim ◽  
Abdel-Nasser Kawde ◽  
Ibrahim Shehatta ◽  
...  
Keyword(s):  
Electrochemical Sensor ◽  
Modified Electrode ◽  
Degradation Product ◽  
Pharmaceutical Formulations ◽  
Voltammetric Determination ◽  
Hybrid Nanocomposite ◽  
Sensing Platform ◽  
Highly Sensitive

A highly selective electrochemical sensor was fabricated based on CeO2–ZnO–chitosan hybrid nanocomposite modified electrode and was successfully applied for the determination of PAR in pharmaceutical formulations.

An electrochemical sensor for the sensitive determination of nitrites based on Pt–PANI–graphene nanocomposites

2015 ◽  
Vol 7 (19) ◽  
pp. 8366-8372 ◽  
Author(s):  
Sai Zhang ◽  
Bo-Qiang Li ◽  
Jian-Bin Zheng
Keyword(s):  
Electrochemical Sensor ◽  
Electrochemical Sensing ◽  
Graphene Nanocomposites ◽  
Sensitive Determination

Electrochemical sensing of nitrites based on novel Pt–PANI–graphene nanocomposites.

Graphene Modified Molecular Imprinting Electrochemical Sensor for Determining the Content of Dopamine

2019 ◽  
Vol 15 (6) ◽  
pp. 628-634
Author(s):  
Rong Liu ◽  
Jie Li ◽  
Tongsheng Zhong ◽  
Liping Long
Keyword(s):  
Electrochemical Sensor ◽  
Molecular Imprinting ◽  
Neurological Disorders ◽  
Room Temperature ◽  
Low Cost ◽  
Differential Pulse ◽  
Current Response ◽  
Specific Selectivity ◽  
Pulse Voltammetry

Background: The unnatural levels of dopamine (DA) result in serious neurological disorders such as Parkinson’s disease. Electrochemical methods which have the obvious advantages of simple operation and low-cost instrumentation were widely used for determination of DA. In order to improve the measurement performance of the electrochemical sensor, molecular imprinting technique and graphene have always been employed to increase the selectivity and sensitivity. Methods: An electrochemical sensor which has specific selectivity to (DA) was proposed based on the combination of a molecular imprinting polymer (MIP) with a graphene (GR) modified gold electrode. The performance and effect of MIP film were investigated by differential pulse voltammetry (DPV) and cyclic voltammetry (CV) in the solution of 5.0 ×10-3 mol/L K3[Fe(CN)6] and K4[Fe(CN)6] with 0.2 mol/L KCl at room temperature. Results: This fabricated sensor has well repeatability and stability, and was used to determine the dopamine of urine. Under the optimized experiment conditions, the current response of the imprinted sensor was linear to the concentration of dopamine in the range of 1.0×10-7 ~ 1.0×10-5 mol/L, the linear equation was I (µA) = 7.9824+2.7210lgc (mol/L) with the detection limit of 3.3×10-8 mol/L. Conclusion: In this work, a highly efficient sensor for determination of DA was prepared with good sensitivity by GR and great selectivity of high special recognization ability by molecular imprinting membrane. This proposed sensor was used to determine the dopamine in human urine successfully.

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