Adsorption of metal cations precisely quantified by surface resistance of thin epitaxial silver film electrodes

Hanewinkel, C.; Winkes, H.; Schumacher, Dieter; Otto, A.

doi:10.1016/s0013-4686(97)00186-2

Cited by 17 publications

(10 citation statements)

References 12 publications

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“…The total charge due to diffusion, therefore, continued to increase with concentration, and thus the fraction of the peak current decrease with increasing concentrations. [15][16][17] Using the proposed model, profiles of current versus potential (-1.3 to -2.0 V) were generated for fixed azithromycin concentrations of 2.4×10 -5 , 9.6×10 -5 , and 1.74×10 -4 . Figure 3 and Table 1 …”

Section: Resultsmentioning

confidence: 99%

Mathematical Modelling of the Electrode Process of Azithromycin Using Cyclic Voltammetry at Hanging Mercury Drop Electrode

Shawabkeh

Tutunji

2002

Sensors

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Abstract:A theoretical treatment is presented to predict the kinetic behaviour of azithromycin at the surface of hanging mercury drop electrode using cyclic voltammetry. A model is developed to incorporate the occurrence of adsorption of the oxidized and reduced species of azithromycin at the surface of mercury drop electrode. An analytical solution was obtained using MATHEMATICA Wolfram Research, Inc.) to predict the cyclic voltammetric profiles by calculating the currents resulting after applying variable potentials ranging -1.9 to -1.3 V versus Ag/AgCl. Simulation runs at different initial concentrations of azithromycin and different scan rates showed good agreement with experimental findings. However, this model should be modified to describe a multilayer adsorption with irreversible electrochemical reaction.

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Section: Resultsmentioning

confidence: 99%

Mathematical Modelling of the Electrode Process of Azithromycin Using Cyclic Voltammetry at Hanging Mercury Drop Electrode

Shawabkeh

Tutunji

2002

Sensors

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“…In this sense, it is interesting to study the modification of the electronic properties of a metal surface by the presence of foreign atoms. One of the methods employed to enquire about these properties is the measure of the surface conductance (SC) changes brought about by the surface impurities [3][4][5][6][7]. SC changes offer the advantage of being sensitive almost exclusively to surface processes [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Deposition and stripping processes of tin on gold film electrodes studied by surface conductance

Fonticelli

Tucceri

Posadas

2004

Electrochimica Acta

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The CV and surface conductance (SC) responses of tin species adsorbed on evaporated gold film electrodes were studied as a function of the potential window and the potential sweep rate. Sn adatoms were generated either, by reducing Sn(II) present in the solution (u p d) or by first irreversibly adsorbing Sn(II) and then reducing it in the supporting electrolyte alone. The experimental results show that at potentials about E ≈ −0.25 V(versus SCE), all the Sn(II) is reduced to Sn(0) and this species is adsorbed on the electrode surface. The subsequent oxidation of Sn(0) leads to Sn(II) ad , adsorbed on the electrode. This species desorbs only when the Sn(II) ad is further oxidised to soluble Sn(IV). The number of electrons involved in the reduction of Sn(II) to Sn(0) and vice versa is two. On the other hand, the analysis of the resistance measurements at low coverage is made by applying the surface Linde's rule. This leads to the conclusion that the Sn(0) behaves as an interstitial impurity. SC experiments, made in the potential region corresponding to Sn bulk deposition, suggest the formation of a bulk Sn-Au alloy.

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“…Therefore, very thin and dense electrodes had to be prepared. In contrast to previous studies at single crystal silver electrodes [10] we have tested platinum and gold as more promising materials for polycrystalline electrodes in electroanalysis. Gold was easier to use in silicon planar technology which was applied for the deposition and microstructuring of the polycrystalline working electrodes.…”

Section: Resultsmentioning

confidence: 99%

Voltohmmetry as an Alternative Detection Method at Polycrystalline Metal Film Electrodes

et al. 2001

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A new method is introduced for the detection of dissolved analytes which can be deposited at noble metal electrodes. It is based on the measurement of surface resistance‐potential curves at thin‐film electrodes and has been named voltohmmetry. The measuring principle, fundamental prerequisites and the necessary experimental set‐up are described. As an example the deposition and dissolution of lead has been studied by cyclic voltohmmetric experiments at specifically prepared thin‐film gold electrodes. The present possibilities and limitations of surface resistance‐potential measurements for electroanalysis are discussed.

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Adsorption of metal cations precisely quantified by surface resistance of thin epitaxial silver film electrodes

Cited by 17 publications

References 12 publications

Mathematical Modelling of the Electrode Process of Azithromycin Using Cyclic Voltammetry at Hanging Mercury Drop Electrode

Mathematical Modelling of the Electrode Process of Azithromycin Using Cyclic Voltammetry at Hanging Mercury Drop Electrode

Deposition and stripping processes of tin on gold film electrodes studied by surface conductance

Voltohmmetry as an Alternative Detection Method at Polycrystalline Metal Film Electrodes

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