The comparison of different gold nanoparticles/graphene nanosheets hybrid nanocomposites in electrochemical performance and the construction of a sensitive uric acid electrochemical sensor with novel hybrid nanocomposites

2011 ◽  
Vol 29 (1) ◽  
pp. 102-108 ◽  
Author(s):  
Ying Xue ◽  
Hong Zhao ◽  
Zhijiao Wu ◽  
Xiangjun Li ◽  
Yujian He ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Uric Acid ◽  
Electrochemical Performance ◽  
Electrochemical Sensor ◽  
Graphene Nanosheets ◽  
Hybrid Nanocomposites

scholarly journals N-Doped Reduced Graphene Oxide/Gold Nanoparticles Composite as an Improved Sensing Platform for Simultaneous Detection of Dopamine, Ascorbic Acid, and Uric Acid

Sensors ◽  
2020 ◽  
Vol 20 (16) ◽  
pp. 4427
Author(s):  
Daria Minta ◽  
Zoraida González ◽  
Piotr Wiench ◽  
Stanisław Gryglewicz ◽  
Grażyna Gryglewicz
Keyword(s):  
Gold Nanoparticles ◽  
Ascorbic Acid ◽  
Uric Acid ◽  
Graphene Oxide ◽  
Detection Limit ◽  
Electrochemical Performance ◽  
Reduced Graphene Oxide ◽  
Simultaneous Detection ◽  
Homogeneous Distribution ◽  
Reduced Graphene

Gold nanoparticles (AuNPs) were homogeneously electrodeposited on nitrogen-doped reduced graphene oxide (N-rGO) to modify a glassy carbon electrode (GCE/N-rGO-Au) in order to improve the simultaneous detection of dopamine (DA), ascorbic acid (AA), and uric acid (UA). N-rGO was prepared by the hydrothermal treatment of graphene oxide (GO) and urea at 180 °C for 12 h. AuNPs were subsequently electrodeposited onto the surface of GCE/N-rGO using 1 mM HAuCl4 solution. The morphology and chemical composition of the synthesized materials were characterized by field-emission scanning electron microscopy and X-ray photoelectron spectroscopy. The electrochemical performance of the modified electrodes was investigated through cyclic voltammetry and differential pulse voltammetry measurements. Compared to GCE/rGO-Au, GCE/N-rGO-Au exhibited better electrochemical performance towards the simultaneous detection of the three analytes due to the more homogeneous distribution of the metallic nanoparticles as a result of more efficient anchoring on the N-doped areas of the graphene structure. The GCE/N-rGO-Au-based sensor operated in a wide linear range of DA (3–100 µM), AA (550–1500 µM), and UA (20–1000 µM) concentrations with a detection limit of 2.4, 58, and 8.7 µM, respectively, and exhibited satisfactory peak potential separation values of 0.34 V (AA-DA), 0.20 V, (DA-UA) and 0.54 V (AA-UA). Remarkably, GCE/N-rGO-Au showed a very low detection limit of 385 nM towards DA, not being susceptible to interference, and maintained 90% of its initial electrochemical signal after one month, indicating an excellent long-term stability.

Flexible and disposable gold nanoparticles-N-doped carbon-modified electrochemical sensor for simultaneous detection of dopamine and uric acid

2020 ◽  
Vol 32 (6) ◽  
pp. 065502
Author(s):  
Aniruddha B Patil ◽  
Chuanbao Zheng ◽  
Liyun Ma ◽  
Ronghui Wu ◽  
Sharwari K Mengane ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Uric Acid ◽  
Electrochemical Sensor ◽  
Simultaneous Detection

Direct Electrodeposition to Fabricate Vertically-Oriented Graphene Nanosheets Modified Electrode and its Application for Determination of Levodopa in the Presence of Uric Acid and Ascorbic Acid

NANO ◽  
2017 ◽  
Vol 12 (07) ◽  
pp. 1750087 ◽  
Author(s):  
Yanju Wu ◽  
Huijun Song ◽  
Kui Lu ◽  
Yong Ye ◽  
Mingxiu Lv ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Uric Acid ◽  
Graphene Oxide ◽  
Electrochemical Sensor ◽  
Modified Electrode ◽  
Graphene Nanosheets ◽  
Potential Method ◽  
Vertical Orientation ◽  
Reduced Graphene

The electrodeposition of reduced graphene oxide (rGO) film with preferred vertical orientation was fabricated on a glassy carbon electrode by using pulse potential method in a graphene oxide solution. The rGO film was applied in developing a high-sensitive electrochemical sensor for detection of levodopa (L-dopa). The new electrochemical sensor displayed a significant response to L-dopa because of its excellent electric conductivity and large specific surface area. Moreover, the determination of L-dopa on this modified electrode was not interfered by the coexistence of ascorbic acid (AA) and uric acid (UA). Under the selective conditions, the modified electrode showed a linear voltammetric response to L-dopa within a certain concentration ranging from [Formula: see text][Formula: see text] mol L[Formula: see text], with the detection limit of [Formula: see text] mol L[Formula: see text]. Besides, the modified electrode also exhibited an excellent selectivity, stability, reproducibility and repeatability.

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