Mohammad Mazloum-Ardakani; Hamed Arabi; Zahra Alizadeh; Mahnoosh Haghshenas; Fatemeh Farbod; Sahar Saadat HosseiniKhah; Bibifatemeh Mirjalili
Abstract
In this research, a novel modified glassy carbon electrode (GCE) was successfully fabricated with a tri-component nanocomposite consisting of 5-(3,4-dihydroxyphenyl)8,8-dimethyl-2-(methyl thio)-7,8,9,10-tetrahydropyrimido [4,5-b]quinolone-4,6(3H,5H)-dione (PQ23) and Nitrogen-doped reduced graphene oxide ...
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In this research, a novel modified glassy carbon electrode (GCE) was successfully fabricated with a tri-component nanocomposite consisting of 5-(3,4-dihydroxyphenyl)8,8-dimethyl-2-(methyl thio)-7,8,9,10-tetrahydropyrimido [4,5-b]quinolone-4,6(3H,5H)-dione (PQ23) and Nitrogen-doped reduced graphene oxide aerogel/molybdenum oxide nanorods (PQ23/N-doped-rGO/MoO2 /GCE) as sensing platform toward hydrazine (HDZ). The nanocomposite is characterized by MAP analysis, X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS). Through electrochemical investigations, the electron transfer coefficient between PQ23 and the N-doped-rGO/MoO2 /GCE (glassy carbon electrode which was modified with reduce graphene oxide decorated by molybdenum oxide nanorods) and the apparent charge transfer rate constant, ks, and diffusion coefficient (D) were calculated. Electrochemical behavior and electrocatalytic activity of the nanocomposite modified GCE were studied by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and differential pulse voltammetry (DPV). Under the optimum experimental condition, the designed sensor exhibited high sensitivity and suitable selectivity for hydrazine oxidation, enabling the detection of hydrazine with a linear range of 25.0-1000.0 µM and a good detection limit (3σ) was 4.2 µM. The designed electrochemical sensor shows good repeatability, reproducibility, and acceptable stability with an RSD less than 3.2%.
Mohammad Mazloum-Ardakani; Fatemeh Jokar; Hamideh Mohammadian-Sarcheshmeh; Bi Bi Fatemeh Mirjalili; Sahar Saadat Hosseinikhah
Abstract
Recently, different significant efforts have been made to fabricate an effectively modified electrode for replying to the growing requests for enhanced performance electrodes for electrochemical sensors. Herein, we introduced an organic material along with a composite of the zinc sulfide (ZnS) particles ...
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Recently, different significant efforts have been made to fabricate an effectively modified electrode for replying to the growing requests for enhanced performance electrodes for electrochemical sensors. Herein, we introduced an organic material along with a composite of the zinc sulfide (ZnS) particles distributed in the substrate of carbon nanotubes (CNTs)/reduced graphene oxide (RGO) nanosheets by using an inexpensive, simple, and one-step fabrication method, as an effectively modified electrode for the determination of hydrazine as an analyte. This electrode represents a great electrochemical performance with a large linear range (0.01 μM-60.0 μM) and a proper limit of detection value (0.006 µM) for determination of hydrazine. Good recovery percentage values for the proposed sensor confirm its excellent ability to measure hydrazine.
Arefeh Gorgij; Hamid Ahmar; Laleh Adlnasab
Abstract
This research aimed to develop a novel sensing platform for hydrogen peroxide (H2O2) quantification in the milk samples. The proposed sensor was fabricated using a glassy carbon electrode modified with Fe-Cu layered double hydroxide (LDH)/magnetic Fe3O4 nanoparticles (FeCu-LDH@Fe3O4/GCE). The resulting ...
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This research aimed to develop a novel sensing platform for hydrogen peroxide (H2O2) quantification in the milk samples. The proposed sensor was fabricated using a glassy carbon electrode modified with Fe-Cu layered double hydroxide (LDH)/magnetic Fe3O4 nanoparticles (FeCu-LDH@Fe3O4/GCE). The resulting sensor was characterized using field emission scanning, electron microscopy, x-ray diffraction, and infrared spectroscopy, with the addition of the electrochemical methods. After optimization of affecting parameters, the FeCu-LDH@Fe3O4/GCE exhibited a high electrocatalytic activity for H2O2 electroreduction; and high cathodic peak currents were obtained. The proposed electrode also illustrated a wide linear dynamic domain in the range of 2 to 400 µM; and low limit of detection was calculated to be 0.6 µM.
Abdolhamid Hatefi-Mehrjerdi; ُُSoghra Rafiei Boldaji; Mohammad Reza Yaftian; Hassan Shayani-Jam
Abstract
A novel Buprenorphine (BPR) sensor is fabricated based on nanocomposite film of benzene-1,3-disulfonate anion doped overoxidized polypyrrole/multiwalled carbon modified glassy carbon electrode. The carbon nanotubes were drop-casted on bare electrode, and then thin layer of benzene-1,3-disulfonate-doped ...
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A novel Buprenorphine (BPR) sensor is fabricated based on nanocomposite film of benzene-1,3-disulfonate anion doped overoxidized polypyrrole/multiwalled carbon modified glassy carbon electrode. The carbon nanotubes were drop-casted on bare electrode, and then thin layer of benzene-1,3-disulfonate-doped overoxidized polypyrrole formed electrochemically on it. Effect of experimental conditions involving supporting electrolyte pH, carbon nanotubes suspension drop size, and the number of potential cycles in overoxidized polymerization were optimized by monitoring the voltammetry responses of the modified electrode. Then the optimized modified electrode was used for electrochemical sensing of BPR by differential pulse voltammetry, which exhibited a linear growth with high sensitivity in anodic peak currents at the BPR concentration range of 0.06-40 µM, and a detection limit of 28 nM. Finally, the determination of BPR in urine real samples was performed by the new sensor and satisfactory results obtained.
