Thiol anchoring and catalysis of gold nanoparticles at the liquid interface of thin-organic film-modified electrodes

Mirčeski, Valentin; Aleksovska, Angela; Pejova, Biljana; Ivanovski, Vladimir; Mitrova, Biljana; Mitreska, Nikolina; Gulaboski, Rubin

doi:10.1016/j.elecom.2013.11.020

Cited by 8 publications

(8 citation statements)

References 21 publications

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“…As observed previously, a white precipitate rapidly accumulated at the interface between water and DCE when r ≥ 2. The presence of the precipitate blocks the interface, reducing the ion transfer currents . To avoid this phenomenon, the pellucid DCE phase of each sample was separated from the precipitate and contacted with a fresh aqueous solution for further voltammetry.…”

Section: Results and Discussionmentioning

confidence: 99%

Electrochemical Insight into the Brust–Schiffrin Synthesis of Au Nanoparticles

Uehara

Booth²,

Chang³

et al. 2015

J. Am. Chem. Soc.

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The mechanism of the Brust-Schiffrin gold nanoparticle synthesis has been investigated through the use of ion transfer voltammetry at the water/1,2-dichloroethane (DCE) solution interface, combined with X-ray absorption fine structure (XAFS) of the reaction between [AuCl4](-) and thiol (RSH) in homogeneous toluene (TL) solution. Ion transfer calculations indicate the formation of [AuCl2](-) at RSH/Au ratios from 0.2-2 with a time-dependent variation observed over several days. At RSH/Au ratios above 2 and after time periods greater than 24 h, the formation of Au(I)SR is also observed. The relative concentrations of reaction products observed at the liquid/liquid interface are in excellent agreement with those observed by XAFS for the corresponding reaction in a single homogeneous phase. BH4(-) ion transfer reactions between water and DCE indicate that the reduction of [AuCl4](-) or [AuCl2](-) to Au nanoparticles by BH4(-) proceeds in the bulk organic phase. On the other hand, BH4(-) was unable to reduce the insoluble [Au(I)SR]n species to Au nanoparticles. The number and size of the nanoparticles formed was dependent on the concentration ratio of RSH/Au, as well as the experimental duration because of the competing formation of the [Au(I)SR]n precipitate. Higher concentrations of nanoparticles, with diameters of 1.0-1.5 nm, were formed at RSH/Au ratios from 1 to 2.

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Section: Results and Discussionmentioning

confidence: 99%

Electrochemical Insight into the Brust–Schiffrin Synthesis of Au Nanoparticles

Uehara

Booth²,

Chang³

et al. 2015

J. Am. Chem. Soc.

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“…Electro analytical methods are rapid, an accurate and cheap alternative which offer very low detection limits for electroactive molecules. Applications of modified electrodes have great interest in various areas of research and development, such as electroanalysis, biosensors and electroanalysis [11][12][13][14].…”

Section: Severalmentioning

confidence: 99%

“…The results obtained were compared statistically with those from reported Spectrofluorimetric method [11] by using Student's t-test and the variance ratio F-test. The results in Table 5 show that the t and F values were smaller than the critical values, indicating that there is no significant difference between the proposed voltammetric method and the published method with respect to accuracy and precision.…”

Section: Applications To Human Urinementioning

confidence: 99%

Sensitive determination of Paracetamol using Ferrocene Nanoparticles by Chitosan-Functionalized - Modified Carbon Past Electrode .

Salem

2018

Egypt. J. Chem.

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E LECTRO analytical methods are rapid, an accurate and cheap alternative which offer very low detection limits for electroactive molecules Ferrocene have been used in electroanalysis of paracetamol studies, due to its large surface area, high conductivity and electroanalysis characteristics. Chitosan have basket type physical shapes are useful in number of commercial and applied chemicals as electrochemical. Determination of paracetamol using differential pulse voltammetry is introducing new effective electrochemical sensor. The sensor is constructed on a carbon paste electrode modified with ferrocene and Chitosan in Britton-Robinson buffer of pH 7.0. The effect of various experimental parameters is including pH, number of cycles of ferrocene and Chitosan and scan rate was investigated. At the optimum conditions, a linear range from 1.0 x 10-9 to 6.2 x 10-8 at 0.9995 as correlation coefficient of and a detection limit of 4.14 x 10-9 mol was obtained. The modified electrode can be used for the determination of the used drug in human urine samples with excellent recovery results.

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“…Electroanalytical methods are rapid, accurate and cheap with very low detection limits for electroactive molecules. Applications of modified electrodes have great interest in various areas of research and development, such as electroanalysis, biosensors and electroanalysis [14][15][16][17][18]. Gold nanoparticles have been used in electroanalysis of pharmaceutical compounds studies, due to its large surface area, high conductivity and electroanalytical characteristics.…”

Section: Introductionmentioning

confidence: 99%

Improvement of adsorptive voltammetric methods for determination of Midodrine by carbon paste electrode modified with gold nano particles in presence of β-cyclodextrin

Salem

2019

Egypt. J. Chem.

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A N effective novel electrochemical sensor constructed for the determination of Midodrine hydrochloride drug using differential pulse voltammetry. The sensor is based on a carbon paste electrode modified with gold nanoparticles and β-cyclodextrin in Britton-Robinson buffer of pH 3.0. The effect of various experimental parameters on the constructed electrodes properties including pH, β-cyclodextrin concentration and scan rate was investigated. At the optimum conditions, a linear range from 3.0 x 10 -6 to 3.2 x 10 -4 mol L -1 with correlation coefficient of 0.9997 and a detection limit of 5.14 x 10 -7 mol L -1 were obtained. The modified electrodes were used for microdetermination of the drug in tablets and spiked human urine samples with appropriate an acceptable recovery, reproducibility, selectivity and robustness.

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Thiol anchoring and catalysis of gold nanoparticles at the liquid interface of thin-organic film-modified electrodes

Cited by 8 publications

References 21 publications

Electrochemical Insight into the Brust–Schiffrin Synthesis of Au Nanoparticles

Electrochemical Insight into the Brust–Schiffrin Synthesis of Au Nanoparticles

Sensitive determination of Paracetamol using Ferrocene Nanoparticles by Chitosan-Functionalized - Modified Carbon Past Electrode .

Improvement of adsorptive voltammetric methods for determination of Midodrine by carbon paste electrode modified with gold nano particles in presence of β-cyclodextrin

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