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

Sensors ◽  
2018 ◽  
Vol 18 (6) ◽  
pp. 1911 ◽  
Author(s):  
Quanguo He ◽  
Jun Liu ◽  
Xiaopeng Liu ◽  
Guangli Li ◽  
Peihong Deng ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Modified Electrodes ◽  
Selective Detection ◽  
Oxide Composite ◽  
Reduced Graphene ◽  
Electrochemically Reduced Graphene Oxide

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.

Highly sensitive simultaneous electrochemical determination of hydroquinone, catechol and resorcinol based on carbon dot/reduced graphene oxide composite modified electrodes

2015 ◽  
Vol 7 (15) ◽  
pp. 6089-6094 ◽  
Author(s):  
Wuxiang Zhang ◽  
Jianzhong Zheng ◽  
Zhongqiu Lin ◽  
Ling Zhong ◽  
Jiangu Shi ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Modified Electrodes ◽  
Electrochemical Determination ◽  
Schematic Diagram ◽  
Carbon Dot ◽  
Oxide Composite ◽  
Reduced Graphene ◽  
Highly Sensitive

A schematic diagram of the preparation processes of CD/r-GO and the CD/r-GO electrode used for the detection of dihydroxybenzene isomers.

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