scholarly journals Bi2S3/rGO Composite Based Electrochemical Sensor for Ascorbic Acid Detection

Chemosensors ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 190
Author(s):  
Chengling Qu ◽  
He Li ◽  
Shuang Zhou ◽  
Guodong Li ◽  
Cheng Wang ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Graphene Oxide ◽  
Electrochemical Sensor ◽  
Electrochemical Impedance ◽  
Facile Hydrothermal Method ◽  
Reduced Graphene ◽  
Catalytic Sites ◽  
Ascorbic Acid Detection ◽  
Enhanced Electrochemical Performance ◽  
Eis Analysis

The engineering of an efficient electrochemical sensor based on a bismuth sulfide/reduced graphene oxide (Bi2S3/rGO) composite to detect ascorbic acid (AA) is reported. The Bi2S3 nanorods/rGO composite was synthesized using a facile hydrothermal method. By varying the amount of graphene oxide (GO) added to the synthesis, the morphology and size of Bi2S3 nanorods anchored on the surface of rGO can be tuned. Compared to a bare glassy carbon electrode (GCE), the GCE modified with Bi2S3/rGO composite presented enhanced electrochemical performance, which was attributed to the optimal electron transport between the rGO support and the loaded Bi2S3 as well as to an increase in the number of active catalytic sites. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) analysis of Bi2S3/rGO/GCE demonstrate that the active Bi2S3/rGO layer on GCE plays an important role in the electrochemical behavior of the sensor. In particular, the Bi2S3/rGO/GCE sensor shows a wide detecting range (5.0–1200 μM), low detection limit (2.9 µM), good sensitivity (268.8 μA mM−1 cm−2), and sufficient recovery values (97.1–101.6%) for the detection of ascorbic acid.

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.

A novel electrochemical sensor for the detection of enrofloxacin based on a 3D flower-like metal tungstate incorporated reduced graphene oxide nanocomposite.

Nanoscale ◽  
2022 ◽  
Author(s):  
Naveen Karuppusamy ◽  
Vinitha Mariyappan ◽  
Shen-Ming Chen ◽  
Rasu Ramachandran
Keyword(s):  
Graphene Oxide ◽  
Electrochemical Sensor ◽  
Hydrothermal Method ◽  
Reduced Graphene Oxide ◽  
Research Field ◽  
Facile Hydrothermal Method ◽  
Metal Tungstate ◽  
Reduced Graphene ◽  
Metal Tungstates

In recent times metal tungstates have received a lot of attention in the various research field. Accordingly, the CaWO4/RGO (CW/RGO) nanocomposite was prepared by the facile hydrothermal method. The electrocatalytic...

scholarly journals A Facile and Green Synthesis of a MoO2-Reduced Graphene Oxide Aerogel for Energy Storage Devices

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 594 ◽  
Author(s):  
Mara Serrapede ◽  
Marco Fontana ◽  
Arnaud Gigot ◽  
Marco Armandi ◽  
Glenda Biasotto ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Impedance ◽  
Chemical Reduction ◽  
Low Cost ◽  
Xps Analysis ◽  
3D Scaffold ◽  
Energy Storage Devices ◽  
Reduced Graphene

A simple, low cost, and “green” method of hydrothermal synthesis, based on the addition of l-ascorbic acid (l-AA) as a reducing agent, is presented in order to obtain reduced graphene oxide (rGO) and hybrid rGO-MoO2 aerogels for the fabrication of supercapacitors. The resulting high degree of chemical reduction of graphene oxide (GO), confirmed by X-Ray Photoelectron Spectroscopy (XPS) analysis, is shown to produce a better electrical double layer (EDL) capacitance, as shown by cyclic voltammetric (CV) measurements. Moreover, a good reduction yield of the carbonaceous 3D-scaffold seems to be achievable even when the precursor of molybdenum oxide is added to the pristine slurry in order to get the hybrid rGO-MoO2 compound. The pseudocapacitance contribution from the resulting embedded MoO2 microstructures, was then studied by means of CV and electrochemical impedance spectroscopy (EIS). The oxidation state of the molybdenum in the MoO2 particles embedded in the rGO aerogel was deeply studied by means of XPS analysis and valuable information on the electrochemical behavior, according to the involved redox reactions, was obtained. Finally, the increased stability of the aerogels prepared with l-AA, after charge-discharge cycling, was demonstrated and confirmed by means of Field Emission Scanning Electron Microscopy (FESEM) characterization.

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