Manganese dioxide Nanorods/electrochemically reduced graphene oxide nanocomposites modified electrodes for cost-effective and ultrasensitive detection of Amaranth

2018 ◽  
Vol 172 ◽  
pp. 565-572 ◽  
Author(s):  
Quanguo He ◽  
Jun Liu ◽  
Xiaopeng Liu ◽  
Guangli Li ◽  
Peihong Deng ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Manganese Dioxide ◽  
Reduced Graphene Oxide ◽  
Modified Electrodes ◽  
Cost Effective ◽  
Ultrasensitive Detection ◽  
Reduced Graphene ◽  
Electrochemically Reduced Graphene Oxide

Fabrication of a novel disposable glucose biosensor using an electrochemically reduced graphene oxide–glucose oxidase biocomposite

2016 ◽  
Vol 8 (38) ◽  
pp. 6974-6981 ◽  
Author(s):  
Kathiresan Vijayaraj ◽  
Suck Won Hong ◽  
Sung-Ho Jin ◽  
Seung-Cheol Chang ◽  
Deog-Su Park
Keyword(s):  
Graphene Oxide ◽  
Glucose Oxidase ◽  
Reduced Graphene Oxide ◽  
Electrochemical Method ◽  
Graphite Electrode ◽  
Cost Effective ◽  
Glucose Biosensor ◽  
Pencil Graphite Electrode ◽  
Reduced Graphene ◽  
Electrochemically Reduced Graphene Oxide

A disposable glucose biosensor has been fabricated on the surface of a cost-effective pencil graphite electrode (PGE) by an electrochemical method, using glucose oxidase (GOx) and reduced graphene oxide (rGO).

scholarly journals Electrochemical Sensor for Rapid and Sensitive Detection of Tryptophan by a Cu2O Nanoparticles-Coated Reduced Graphene Oxide Nanocomposite

Biomolecules ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 176 ◽  
Author(s):  
Quanguo He ◽  
Yaling Tian ◽  
Yiyong Wu ◽  
Jun Liu ◽  
Guangli Li ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Low Cost ◽  
Supporting Electrolyte ◽  
Modified Electrodes ◽  
High Sensitivity ◽  
Experimental Conditions ◽  
Reduced Graphene ◽  
Electrochemically Reduced Graphene Oxide

In this paper, a nanocomposite of cuprous oxide and electrochemically reduced graphene oxide (Cu2O–ERGO) was prepared by a simple and low-cost method; hereby, a new method for the electrochemical determination of tryptophan (Trp) by this composite modified glassy carbon electrode (GCE) is proposed. The prepared materials and modified electrodes were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and cyclic voltammetry (CV). The results showed that Cu2O–ERGO/GCE had good electrocatalytic activity for Trp. The effects of supporting electrolyte, scanning rate, accumulation potential, and accumulation time on the determination of Trp were studied. Under the optimum experimental conditions, Trp was quantitatively analyzed by square-wave voltammetry (SWV). The oxidation peak current of Trp had a good linear relationship with its concentration in the range of 0.02–20 μM, and the detection limit was 0.01 μM (S/N = 3). In addition, the modified electrode has high sensitivity, good repeatability, and long-term stability. Finally, the proposed method has been successfully applied in the determination of Trp concentration in practical samples.

scholarly journals Improving the Voltammetric Determination of Hg(II): A Comparison Between Ligand-Modified Glassy Carbon and Electrochemically Reduced Graphene Oxide Electrodes

Sensors ◽  
2020 ◽  
Vol 20 (23) ◽  
pp. 6799
Author(s):  
Matei D. Raicopol ◽  
Andreea M. Pandele ◽  
Constanţa Dascălu ◽  
Eugeniu Vasile ◽  
Anamaria Hanganu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Detection Limit ◽  
Reduced Graphene Oxide ◽  
Glassy Carbon ◽  
Anodic Stripping Voltammetry ◽  
Modified Electrodes ◽  
Surface Binding ◽  
Oxide Electrodes ◽  
Reduced Graphene ◽  
Electrochemically Reduced Graphene Oxide

A new thiosemicarbazone ligand was immobilized through a Cu(I)-catalyzed click reaction on the surface of glassy carbon (GC) and electrochemically reduced graphene oxide (GC-ERGO) electrodes grafted with phenylethynyl groups. Using the accumulation at open circuit followed by anodic stripping voltammetry, the modified electrodes showed a significant selectivity and sensibility for Hg(II) ions. A detection limit of 7 nM was achieved with the GC modified electrodes. Remarkably, GC-ERGO modified electrodes showed a significantly improved detection limit (0.8 nM), sensitivity, and linear range, which we attribute to an increased number of surface binding sites and better electron transfer properties. Both GC and GC-ERGO modified electrodes proved their applicability for the analysis of real water samples.

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