Modification of electrodes with nanostructured functionalized thiadiazole polymer film and its application to the determination of ascorbic acid

Kalimuthu, Palraj; John, S. Abraham

doi:10.1016/j.electacta.2009.08.034

Cited by 45 publications

(14 citation statements)

References 41 publications

(47 reference statements)

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“…The similar values implied that the numbers of electrons and protons involved in the oxidation mechanisms of AA, DA, and UA should be the same. Since the oxidation of AA 47, DA 48, and UA 45, 49 all have been shown to be a two‐electron process, the numbers of protons involved in their oxidation should also be two. Therefore, phosphate buffer with pH 7 was selected and used as the supporting electrolyte in all voltammetric determinations.…”

Section: Resultsmentioning

confidence: 99%

Simultaneous Determination of Ascorbic Acid, Dopamine and Uric Acid, at a Graphene Paste Electrode Modified with Functionalized Graphene Sheets

Parvin

2015

Electroanalysis

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The present study reports the simultaneous determination of ascorbic acid (AA), dopamine (DA) and uric acid (UA) in phosphate buffer solution (pH 7.0) using graphene paste electrode modified with functionalized graphene sheets (GPE‐MFGSs). The presence of FGS inhibited the adsorption of AA owing to the electrostatic repulsion, but was favorable for the affinity adsorption of DA and UA via the ion exchange and hydrogen bonding mechanisms, respectively. This led to the decrease in the oxidation potential of AA and the significantly enhanced oxidation peak currents of DA and UA at the GPE‐MFGSs. By cyclic voltammetry and differential pulse voltammetry, the oxidation potentials of AA, DA, and UA, at the GPE‐MFGSs in a ternary mixture were found to be well resolved so that their simultaneous determination could be achieved. Furthermore, the influence of some experimental variables such as graphene paste composition, working solution pH, scan rate and pulse amplitude was studied. In addition, by differential pulse voltammetry, the linear dependence of peak current on the concentration was obtained in the ranges of 0.05–9.0, 0.03–13, and 0.03–5.5 µM with the lowest detection limits of 0.02, 0.01, and 0.01 µM for AA, DAand UA, , respectively.

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Section: Resultsmentioning

confidence: 99%

Simultaneous Determination of Ascorbic Acid, Dopamine and Uric Acid, at a Graphene Paste Electrode Modified with Functionalized Graphene Sheets

Parvin

2015

Electroanalysis

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“…In general, the electrochemical polymerization method allows for the fabrication of a uniform film with controllable thickness on the surface of electrodes. However, the low production caused by the small electrode area, the requirement of conducting substrates, the impurity of the resulting polymer, and pollution from the waste electrolyte restrict its wide applications [ 4 ]. By contrast, the chemical oxidative polymerization method shows some advantages involving mass production, controllable micro-morphology of polymer, easily adjustable reaction conditions, and simple doping-dedoping chemistry [ 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Highly Productive Synthesis, Characterization, and Fluorescence and Heavy Metal Ion Adsorption Properties of Poly(2,5-dimercapto-1,3,4-thiadiazole) Nanosheets

Huang

Min

et al. 2017

Polymers

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Poly(2,5-dimercapto-1,3,4-thiadiazole) (PBT) nanosheets were synthesized by chemical oxidative synthesis under mild conditions. The media, oxidant species, monomer concentrations, oxidant/monomer molar ratio, and temperature were optimized to achieve higher yields and better performance. The molecular structure, morphology, and properties of the nanosheets were analyzed by Fourier transform infrared (FT-IR), ultraviolet-visible (UV-Vis), and fluorescence spectroscopies, wide-angle X-ray diffraction (WAXD), matrix-assisted laser desorption/ionization/time-of-flight (MALDI-TOF) mass spectrometry, X-ray photoelectron spectroscopy (XPS), scanning electronic microscopy (SEM), transmission electron microscopy (TEM), and simultaneous thermogravimetry and differential scanning calorimetry (TG-DSC). It was found that the polymerization of 2,5-dimercapto-1,3,4-thiadiazole occurs via dehydrogenation coupling between two mercapto groups to form the -S-S-bond. PBTs show the highest polymerization yield of up to 98.47% and form uniform nanosheets with a thickness of 89~367 nm. poly(2,5-dimercapto-1,3,4-thiadiazole) polymers (PBTs) exhibit good chemical resistance, high thermostability, interesting blue-light emitting fluorescence, and wonderful heavy metal ion adsorption properties. Particularly, the PBT nanosheets having a unique synergic combination of three kinds of active -S-, -SH, and =N-groups with a moderate specific area of 15.85 m 2 g −1 exhibit an ultra-rapid initial adsorption rate of 10,653 mg g −1 h −1 and an ultrahigh adsorption capacity of up to 680.01 mg g −1 for mercury ion, becoming ultrafast chelate nanosorbents with a high adsorption capacity. With these impressive properties, PBT nanosheets are very promising materials in the fields of water treatment, sensors, and electrodes.

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“…Conductive polymer films are widely used for the fabrication of CMEs for electrooxidation of AA [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. Polyaniline (PANI) has become one of the most extensively studied conducting polymers, due to its high polymerization yield, high conductivity, and redox reversibility [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical analysis of ascorbic acid using copper nanoparticles/polyaniline modified glassy carbon electrode

Ren

Luo

et al. 2010

Journal of Electroanalytical Chemistry

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Modification of electrodes with nanostructured functionalized thiadiazole polymer film and its application to the determination of ascorbic acid

Cited by 45 publications

References 41 publications

Simultaneous Determination of Ascorbic Acid, Dopamine and Uric Acid, at a Graphene Paste Electrode Modified with Functionalized Graphene Sheets

Simultaneous Determination of Ascorbic Acid, Dopamine and Uric Acid, at a Graphene Paste Electrode Modified with Functionalized Graphene Sheets

Highly Productive Synthesis, Characterization, and Fluorescence and Heavy Metal Ion Adsorption Properties of Poly(2,5-dimercapto-1,3,4-thiadiazole) Nanosheets

Electrochemical analysis of ascorbic acid using copper nanoparticles/polyaniline modified glassy carbon electrode

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