Sonochemical Synthesis of CdS Nanoparticles(CdSNCs) and Studies of the Electrochemical Behavior of phenol at CdSNCs Modified Electrode
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Nanoparticles of cadmium sulfide(CdSNCs) have been successfully prepared by a facilely sonochemical method from an aqueous solution of cadmium chloride and sodium sulfide.The size of the CdSNCs prepared was about 2-5 nm according to X-ray diffraction spectra and transmission electron microscopy images.The electrochemical behaviors of the CdSNCs modified glassy carbon electrode(GCE) have been studied and showed distinct advantages,such as higher catalysis activity and lower detection limit for phenol.A novel phenol sensor was constructed through modification of CdS nanoparticles on a GCE.The electrode showed good electrochemical activity in pH 6.0 phosphoric acid buffer solution.Experimental results showed that phenol could be oxidized by the modified electrode to form a detectable product.The linear range for phenol determination ranged from 2.0×10-7 mol/L to 2.0×10-4 mol/L with a detection limit of 2.0×10-8 mol/L.The possible mechanism of the electrochemical oxidation of phenol-solution was also investigated.Keywords:
Cadmium sulfide
Phosphoric acid
Glassy carbon
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A simple one-step method is used to synthesize phosphorus modified gold nanoparticles(Au-P NPs) by using white phosphorus as reducing agent.The particle size of Au-P NPs can be easily controlled by varying the molar ratio of HAuCl4 to P4.The methodology,structure and surface composition of as-papered Au-P NPs are detailedly investigated by X-ray powder diffraction(XRD),Fourier transform infrared(FT-IR) and transmission electron microscopy(TEM) measurements.Cyclic voltammetry measurements are applied to investigate the electrocatalytic performance of Au-P NPs for glucose oxidation.The electrochemical measurements show that Au-P NPs have higher electrocatalytic performance for glucose oxidation in pH 7.4 phosphate buffer solution(PBS) than the other Au NPs.Furthermore,the Au-P NPs modified electrode exhibits remarkably excellent electrochemical stability for electrooxidation of glucose.Thus,a sensitive enzyme-free electrochemical sensor with wide linear range(9.0× 10-6-1.8× 10-2 mol/L) and low detection limit(5.0× 10-6 mol/L) can be easily developed for the detection of glucose in pH 7.4 phosphate buffer solution.
Buffer solution
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Narrow-size range and highly dispersed FeWO4 particles have been successfully synthesized by an ethylene glycol(EG)-assisted ultrasonic technique.The products were characterized by X-ray diffraction(XRD),field emission scanning electronic microscope(FESEM),and FT-IR spectra analysis.The obtained FeWO4 were immobilized on glass carbon electrode(GCE) to fabricate FeWO4/CHIT/GCE electrode.The electrochemical test results proved that it could enhance electron transfer for the heme Fe(Ⅲ) to Fe(Ⅱ) redox couple.The FeWO4/CHIT/GCE electrode was further immobilized with hemoglobin to fabricate a novel H2O2 sensor.The sensor showed an excellent bioelectrocatalytic activity towards H2O2 with a linear range from 5.0 to 460 μmol·L-1,and the detection limit was 1.0 μmol·L-1 at 3σ.
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Amperometry
Glassy carbon
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Dispersity
Electrochemical gas sensor
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Copper sulfide nanospheres (CuS NS) were prepared by a solvothermal method with the support of p-phenylene diamine as a structure direct agent. The formation of CuS NS was evaluated using XRD, FE-SEM, HR-TEM, XPS, and electrochemical methods. The CuS NS modified electrode demonstrated excellent electro-catalytic behavior for the electro-oxidation of oxalic acid (OA). The modified electrode showed a good linear range (50 to 700 μM), high sensitivity (0.0353 μA μM-1 cm-2), a low detection limit (35.6 μM), long term stability and good anti-interference behavior.
Oxalic Acid
Copper sulfide
Linear range
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A novel amperometric sensor for the detection of hydrogen peroxide(H2O2) was prepared by electro-deposition of silver nanoparticles on the graphite electrode.The silver nanoparticles was characterized with UV-Vis spectroscopy and scanning electron microscopy.The electrochemical performances of the electrode were studied by cyclic voltammetry.The silver nanoparticles immobilized on the graphite electrode exhibited an excellent electrocatalytic response toward reduction of H2O2.The resulting Ag nanoparticles modified sensor showed a good sensitivity with a linear range of 1.1×10-5 ~ 2.2 ×10-2 mol/L(correlation coefficient r=0.996 9).Its detection limit was 3.8×10-6 mol/L.The preparation process of the proposed H2O2 sensor was convenient,and the H2O2 sensor showed high sensitivity,low detection limit and good stability.
Amperometry
Silver nanoparticle
Electrochemical gas sensor
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A simple chemical route has been applied for the preparation of quasi-spherical silver (Ag) nanoparticles (NPs) with average diameter of 265 and 8 nm. The as prepared products were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM) and UV-vis absorption spectroscopy. Ag NPs immobilized on glassy carbon (GC) electrode showed a superior electrocatalytic activity for the reduction of hydrogen peroxide (H2O2) in aqueous medium. The fabricated electrode was also applied for the amperometric detection of H2O2 and showed a favorable response at an applied potential of -0.5 V (vs. Ag/AgCl). The results demonstrate that the fabricated electrode has potential application for hydrogen peroxide sensor.
Amperometry
Glassy carbon
Silver nanoparticle
Reversible hydrogen electrode
Electrochemical gas sensor
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