Molybdenum Trioxide Dihydrate-Graphene Composite for Electrochemical Detection of Thiourea Molecule

NANO ◽  
2016 ◽  
Vol 11 (03) ◽  
pp. 1650036 ◽  
Author(s):  
Xinmeng Zhang ◽  
Kezhi Li ◽  
Hejun Li ◽  
Jinhua Lu ◽  
Leilei Zhang
Keyword(s):  
Electrochemical Sensor ◽  
Modified Electrode ◽  
Molybdenum Trioxide ◽  
Electrochemical Sensing ◽  
Carbon Electrode ◽  
X Ray ◽  
Glass Carbon Electrode ◽  
Graphene Composite ◽  
Relative Standard ◽  
Glass Carbon

A novel electrochemical sensing platform was constructed based on a facile self-assembly procedure synthetic laminar molybdenum trioxide dihydrate (MoO[Formula: see text]H2O)-graphene composite. Field emission scanning electron microscopy (FESEM), X-ray spectroscopy, X-ray diffraction (XRD) and Raman spectroscopy were employed to characterize the morphology and composition of the MoO[Formula: see text]H2O-graphene composite. As a model molecule, thiourea was utilized to investigate the electrochemical behaviors of the MoO[Formula: see text]H2O-graphene composite modified glass carbon electrode. The results show that the composite modified electrode has higher electron transfer rate than that of graphene modified electrode and bare glass carbon electrode meanwhile the peak currents of it has a good linear relationship with thiourea concentrations in the range of [Formula: see text] ([Formula: see text]) with detection limit of 4.99[Formula: see text][Formula: see text]M ([Formula: see text]). This novel electrochemical sensor exhibits a higher absorption capacity ([Formula: see text][Formula: see text]mol/cm2), a good reproducibility (1.41% relative standard deviation (RSD)), excellent anti-interference and a high stability. These excellent electrochemical properties of the MoO[Formula: see text]H2O-graphene composite are attributed to the loose and porous structure and the synergistic effects between graphene and MoO[Formula: see text]H2O, which make this composite material hold great potential applications for electrochemical sensor.

Electrocatalytic reduction of PhCH2Br on a Ag–Y zeolite modified electrode

RSC Advances ◽  
2015 ◽  
Vol 5 (53) ◽  
pp. 42663-42665 ◽  
Author(s):  
Huan Wang ◽  
Li He ◽  
Guo-Jiao Sui ◽  
Jia-Xing Lu
Keyword(s):  
Catalytic Activity ◽  
Electrochemical Reduction ◽  
Modified Electrode ◽  
Carbon Electrode ◽  
Electrocatalytic Reduction ◽  
Y Zeolite ◽  
Glass Carbon Electrode ◽  
Glass Carbon ◽  
Electrochemical Reduction And Carboxylation

A Ag-exchanged Y zeolite was prepared and modified on a glass carbon electrode, which displayed excellent catalytic activity towards electrochemical reduction and carboxylation of PhCH2Br.

A High-Performance Bimetallic Pd-Cu Nanoparticles Membrane on Glassy Carbon Electrode for Formic Acid Oxidation

2013 ◽  
Vol 704 ◽  
pp. 264-269 ◽  
Author(s):  
Wei Wei ◽  
Yi Liu ◽  
Qi Jin Wan ◽  
Nian Jun Yang
Keyword(s):  
Formic Acid ◽  
Modified Electrode ◽  
High Performance ◽  
Formic Acid Oxidation ◽  
Acid Oxidation ◽  
Carbon Electrode ◽  
Mixed Solution ◽  
Glass Carbon Electrode ◽  
Cu Content ◽  
Glass Carbon

The Palladium-copper nanoparticles (PdCu NPs) have been prepared by potentiostatic electrodeposition from a mixture electrolyte of H2PdCl4 and CuSO4,then placed the electrode in sulfuric acid using cyclic voltammetry sweep a few laps to fabricate the PdCu NPs/glass carbon electrode (Pd-Cu/GCE). The modified electrode electrochemical properties of a preliminary study found that this modified electrode has good stability and electrochemical activity, experiments show that formic aicd has good voltammetric response of the electrode. The electrical activity of the formic acid in the Pd/GCE is lower than that in the Pd-Cu/GCE, this is due to the synergistic effect of the bimetal. When the Cu content is increased gradually in H2PdCl4 and CuSO4 a mixed solution, the formic acid oxidation peak currentlower, because Cu has no electrocatalytic activity for formic acid oxidation.

A Simple and High-Performance Hydrazine Sensor Based on Graphene Nano Platelets Supported Metal Nanoparticles

2013 ◽  
Vol 704 ◽  
pp. 246-251 ◽  
Author(s):  
Yi Liu ◽  
Bei Bei Li ◽  
Wei Wei ◽  
Qi Jin Wan ◽  
Nian Jun Yang
Keyword(s):  
Electron Microscope ◽  
Modified Electrode ◽  
High Performance ◽  
X Ray ◽  
Glass Carbon Electrode ◽  
Transmission Electron ◽  
Glass Carbon ◽  
Graphene Glass ◽  
Supported Metal Nanoparticles ◽  
Hydrazine Sensor

Gold-palladium nanoparticles (AuPd NPs) were prepared on a layer of graphene (GR) film by potentiostatic electrodeposition from a mixture electrolyte of HAuCl4and H2PdCl4to fabricate the AuPdNPs/graphene/glass carbon electrode (AuPd/GR/GCE). The synthesized composite has been characterized using scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX). Electrocatalytic oxidation of hydrazine on the surface of modified electrode was investigated with cyclic voltammetry and chronoamperometry methods, the results showed that theAuPd NPshigh catalysis for the electrochemical oxidation of hydrazine and the excellent conductivity of graphene. Electrocatalytic activity of the modified electrode was investigated for the oxidation of hydrazine in 0.1 M phosphate buffer solutions (pH=6.0). Under the optimized conditions, the oxidation current of hydrazine was linear to its concentration in the range of 2185 μM, and the estimated detection limit was 0.2 μM (S/N =3).

scholarly journals In-situ Polymerization of N-(3-aminobenzyl)-N, N-dimethyl-N-dodecyl Ammonium Bromide on Glassy Carbon Electrode for Estradiol Detection

2018 ◽  
Vol 3 (2) ◽  
Keyword(s):  
Modified Electrode ◽  
Mixed Micelle ◽  
In Situ Polymerization ◽  
Endocrine Disrupting Chemicals ◽  
Ammonium Bromide ◽  
Carbon Electrode ◽  
Glass Carbon Electrode ◽  
Endocrine Disrupting ◽  
Glass Carbon

Estradiol is a common endocrine disrupting chemicals. Therefore, it is necessary to develop simple, sensitive and rapid methods for testosterone bioanalysis. In this work, poly (N-(3-aminobenzyl)-N,N-dimethyl-N-dodecyl ammonium bromide) (PAS), a novel cathodic organic electrochemiluminescence (ECL) emitter, was synthesized by in-situ polymerization of the corresponding monomer on glass carbon electrode. The PAS ECL system was constructed with the PAS modified electrode, and potassium persulfate (KPS) as oxidizing agent and co-reactant. It was applied to the ECL detection of estradiol. According to the results of fluorescence and dynamic light scattering (DLS), mixed micelle of PAS and estradiol was formed. The combination of PAS with estradiol intensified the fluorescence of the ECL system and enlarged the colloidal size. Hydrogen bonds and electrostatic interaction may play a role in the combination. The linearity for estradiol quantification is 6 pM to 1.5 nM with a LOD of 0. 1 pg/mL. The modified electrode can be easily renewed by washing with ethanol and water and the relative error in estradiol measurement does not exceed ± 7% in 7 time recycling. The detection of estradiol in urine sample qualified the ECL system with a recovery of 94.5 to 105% and the calculated coefficient of variation of 3.8%. This indicates that the PAS ECL system has the potential to detect estradiol in urine.

scholarly journals Electrochemical Determination of Trace Pb (II) by The Modified Glassy Carbon Electrode Compositing MultiWalled Carbon Nanotubes-Nafion-Bi Film

2020 ◽  
pp. 1-12
Keyword(s):  
Carbon Nanotubes ◽  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Anodic Stripping Voltammetry ◽  
Electrochemical Sensing ◽  
Carbon Electrode ◽  
Bismuth Film ◽  
Modified Glassy Carbon Electrode

A modified glassy carbon electrode (GCE) compositing multi-walled carbon nanotubes (MWCNTs), Nafion and bismuth film was prepared and applied for the sensitive detection of trace Pb (II). MWCNTs were dispersed into ethanol by ultrasonication in the presence of Nafion and the nanotubes are coated onto the bare GCE. After that, an extra Nafion adhesion agent is added to the electrode. By the in situ plating, a bismuth film was fabricated on the MWCNTs-NA/GCE, making the desired electrode, MWCNTs-NA-Bi/GCE. The modified electrode was characterized by differential pulse anodic stripping voltammetry, scanning electron microscopy, and cyclic voltammetry. A deposition potential of –1.4 V (vs. Ag/AgCl) and a deposition time of 300 s were applied to the working electrode under stirred conditions after optimizing. Nanotubes and Nafion concentrations and pH were carefully optimized to determine trace lead ions by using the electrode as an electrochemical-sensing platform. Nafion effectively increased the stability and adhesivity of the composite film. The MWCNTs-NA-Bi film modified electrode can remarkably increase the anodic peak current of Pb2+. The sensitivity of MWCNTs-NA-Bi/GCE is 4.35 times higher than that of the bare GCE with bismuth film. The prepared electrode showed excellent stability and reproducibility and can be applied for determination of Pb2+ contained wastewater.

Novel Acetylcholinesterase Biosensor for Detection of Paraoxon Based on Holey Graphene Oxide Modified Glass Carbon Electrode

2018 ◽  
Vol 30 (10) ◽  
pp. 2258-2264 ◽  
Author(s):  
Yan Ping Li ◽  
Rui Xia Zhao ◽  
Gao Yi Han ◽  
Yao Ming Xiao
Keyword(s):  
Graphene Oxide ◽  
Carbon Electrode ◽  
Glass Carbon Electrode ◽  
Glass Carbon
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