Theory and experimental characterization of linear gold microelectrodes with submicrometer thickness

Bond, Alan M.; Henderson, T. L.; Thormann, Wolfgang

doi:10.1021/j100404a026

Cited by 68 publications

(31 citation statements)

References 7 publications

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“…It is well known that k s values measured using ultra microelectrodes are clearly greater than those obtained by using conventionally Pt electrodes of normal size. This observation can be ascribed to the increase of passivity of the surface of electrode through a film (or coating) formation, something which occurs on normal-size electrodes but not on microelectrodes [28]. For simple heterogeneous redox reactions between an electrode and electro-active species, which are associated with only slight differences in molecular structure among oxidized and reduced forms (e.g., no bond fracture or formation occurs), the equation of Marcus [29,30] can be applied in order to calculate the activation free energies for the electron transfer process (DG exp = ) from the obtained k s values:…”

Section: Cyclic Voltammetrymentioning

confidence: 99%

Electrochemical impedance spectroscopy and cyclic voltammetry of ferrocene in acetonitrile/acetone system

Tsierkezos

Ritter

2009

J Appl Electrochem

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The oxidation of ferrocene (FeCp 2 ) to ferrocenium cation (FeCp 2 ? ) (where Cp: cyclopentadienyl anion, C 5 H 5 -) was investigated by means of electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) on either platinum (Pt) or glassy carbon (G-C) electrodes in acetonitrile (ACN), acetone (ACE), and acetonitrile (ACN)/ acetone (ACE) binary mixtures with n-tetrabutylammonium hexafluorophosphate (TBAPF 6 ) as background electrolyte at T = 294.15 K. The half-wave potentials (E 1/2 ), the diffusion coefficients (D), and the heterogeneous electrontransfer rate constants (k s ) were derived. The activation free energies for electron transfer (DG exp = ) were experimentally determined and compared with the theoretical values (DG cal = ). The electron-transfer process was reversible and diffusion-controlled in all investigated solvent mixtures. The changes on the metal-ligand bond lengths upon electron transfer were almost insignificant. The E 1/2 values were shifted to less positive potentials with the increase of the ACN content. The k s values obtained on Pt electrode were slightly larger compared to k s measured on G-C electrode, while in both cases the k s values were diminished with the enrichment of the mixtures in ACN. The EIS spectra confirmed that the rate-determining step in the whole process is the diffusion of the FeCp 2 species and thus the process can be properly characterized as diffusion-controlled.

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Section: Cyclic Voltammetrymentioning

confidence: 99%

Electrochemical impedance spectroscopy and cyclic voltammetry of ferrocene in acetonitrile/acetone system

Tsierkezos

Ritter

2009

J Appl Electrochem

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“…Paired microbands have been developed by an epoxied thin mica sheet with sputtered gold on both sides [11] or by sealing of two metalized glass slides separated with a plastic spacer [12] . Photolithography has also been employed to fabricate microbands [13][14][15] and interdigited array electrodes [16] by metal evaporation [17] , sputtering [18,19] and chemical vapour deposition [7,20,21] . Boron doped diamond ultramicroband electrodes have been realised based on lithography and chemical vapour deposition [22,23] .…”

Section: Introductionmentioning

confidence: 99%

Arrays of Screen‐Printed Graphite Microband Electrodes as a Versatile Electroanalysis Platform

et al. 2014

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Arrays of microband electrodes were developed by screen printing followed by cutting, which enabled the realization of microband arrays at the cut edge. Microband arrays of different designs were characterised with physical and electrochemical methods. In both cases the methods showed that the microband width was around 5 m. Semi-steady-state cyclic voltammetry responses were observed for redox probes.Chronocoulometric measurements showed the establishment of convergent diffusion regimes characterized by current densities similar to those of a single microelectrode.The analytical performance of the elaborated electrode system and its versatility were illustrated with two electrochemical assays: detection of ascorbic acid via direct oxidation and a mediated glucose biosensor fabricated via dip coating. Due to convergent mass transport both systems showed enhancement of the analytical characteristics. The developed approach can be adapted to automated electrode recovery.

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“…O interesse na aplicação de microeletrodos em química analítica está relacionado a suas propriedades únicas tais como maior eficiência no transporte de massa, menor tempo de resposta, reduzida queda ôhmica e melhor relação sinal-ruído em comparação com eletrodos de tamanho convencional. Estas propriedades derivam de suas dimensões e da predominância de difusão radial em eletrodos de raio micrométrico ou submicrométrico [191][192][193] .…”

Section: Redes De Microeletrodos Fabricadas Por Tecnologia De "Screenunclassified

Eletrodos fabricados por "silk-screen"

Nascimento¹,

Angnes²

1998

Quím. Nova

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Recebido em 6/11/97; aceito em 12/1/98 SCREEN-PRINTED ELECTRODES. A review dealing with the use of screen-printing technology to manufacture disposable electrodes is presented, covering in details virtually all the publications in the area up to early 1997 and including 206 references. The elements and different strategies on constructing modified electrodes are highlighted. Commercial and Home-made ink recipes are discussed. Microelectrode arrays, built by the combination of photostructuring and screen-printing technologies to the mass production of advanced disposable sensors, are also discussed. Future research trends are predicted.

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Theory and experimental characterization of linear gold microelectrodes with submicrometer thickness

Cited by 68 publications

References 7 publications

Electrochemical impedance spectroscopy and cyclic voltammetry of ferrocene in acetonitrile/acetone system

Electrochemical impedance spectroscopy and cyclic voltammetry of ferrocene in acetonitrile/acetone system

Arrays of Screen‐Printed Graphite Microband Electrodes as a Versatile Electroanalysis Platform

Eletrodos fabricados por "silk-screen"

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