In-situ fabrication of reduced graphene oxide/leucomethylene blue/platinum nanoparticles modified electrode for voltammetric determination of trace Fe(II) in seawater

A highly sensitive and selective 2D electrochemical sensor based on an rGO/PtNPs/NFN nanocomposite was developed for routine detection of renin inhibitors such as aliskiren in biological samples.

Download Full-text

Voltammetric Determination of Trace Zn(II) in Seawater on a Poly(sodium 4-styrenesulfonate)/Wrinkled Reduced Graphene Oxide Composite Modified Electrode

Journal of The Electrochemical Society ◽

10.1149/1945-7111/ab7b83 ◽

2020 ◽

Vol 167 (4) ◽

pp. 046519 ◽

Cited By ~ 1

Author(s):

Su Ma ◽

Hong Wei ◽

Dawei Pan ◽

Fei Pan ◽

Chenchen Wang ◽

...

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Modified Electrode ◽

Voltammetric Determination ◽

Oxide Composite ◽

Reduced Graphene

Download Full-text

Simultaneous Electrodeposition of Reduced Graphene Oxide/Ag Nanoparticles as a Sensitive Layer for Voltammetric Determination of Tinidazole

NANO ◽

10.1142/s1793292017500679 ◽

2017 ◽

Vol 12 (06) ◽

pp. 1750067 ◽

Cited By ~ 1

Author(s):

Saeed Shahrokhian ◽

Mostafa Navabi ◽

Rahim Mohammadi

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Modified Electrode ◽

Electrochemical Impedance ◽

Simple Procedure ◽

Voltammetric Determination ◽

Clinical Samples ◽

Reduction Peak ◽

Reduced Graphene

A stable composite film of silver nanoparticles (Ag NPs) decorated on reduced graphene oxide is prepared by a two-step simple procedure. The surface morphology of the modified electrode is characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM) techniques. The electrochemical behavior of tinidazole (TNZ) on the surface of the modified electrode is investigated by linear sweep voltammetry and electrochemical impedance spectroscopy. The prepared composite electrode acts as a highly sensitive platform for the voltammetric determination of TNZ, leading to a significant increase in the reduction peak current of TNZ. The effects of experimental parameters such as the amount of the casted silver ions-GO mixture suspension, the electro-reduction variables, the accumulation time and potential, the scan rate and pH of the buffered solutions on the electrochemical response of TNZ are investigated. Under optimal conditions, the modified electrode showed a wide linear range for the reduction of TNZ in the range of 0.01–10[Formula: see text][Formula: see text]M with a detection limit of 3[Formula: see text]nM. Finally, the prepared electrode is successfully applied for the determination of TNZ in pharmaceutical and clinical samples.

Download Full-text

Simultaneous Determination of Uric Acid and Xanthine Using a Poly(Methylene Blue) and Electrochemically Reduced Graphene Oxide Composite Film Modified Electrode

Journal of Analytical Methods in Chemistry ◽

10.1155/2014/984314 ◽

2014 ◽

Vol 2014 ◽

pp. 1-10 ◽

Cited By ~ 3

Author(s):

Gen Liu ◽

Wei Ma ◽

Yan Luo ◽

Deng-ming Sun ◽

Shuang Shao

Keyword(s):

Methylene Blue ◽

Uric Acid ◽

Graphene Oxide ◽

Composite Film ◽

Simultaneous Determination ◽

Reduced Graphene Oxide ◽

Modified Electrode ◽

Reduced Graphene ◽

Electrochemically Reduced Graphene Oxide

Poly(methylene blue) and electrochemically reduced graphene oxide composite film modified electrode (PMB-ERGO/GCE) was successfully fabricated by electropolymerization and was used for simultaneous determination of uric acid (UA) and xanthine (Xa). Based on the excellent electrocatalytic activity of PMB-ERGO/GCE, the electrochemical behaviors of UA and Xa were studied by cyclic voltammetry (CV) and square wave voltammetry (SWV). Two anodic sensitive peaks at 0.630 V (versus Ag/AgCl) for UA and 1.006 V (versus Ag/AgCl) for Xa were given by CV in pH 3.0 phosphate buffer. The calibration curves for UA and Xa were obtained in the range of 8.00 × 10−8~4.00 × 10−4 M and 1.00 × 10−7~4.00 × 10−4 M, respectively, by SWV. The detection limits for UA and Xa were3.00×10-8 M and5.00×10-8 M, respectively. Finally, the proposed method was applied to simultaneously determine UA and Xa in human urine with good selectivity and high sensitivity.

Download Full-text