SciELO - Scientific Electronic Library Online

 
vol.18 issue1Synthesis and Spectroscopic Characterization of the Products Derived from the Reaction of [Ru3(CO)12] with the Chloroaryliderhodanine LigandReflections on the Difficulties that the Development and Progress of Organic Metallic Chemistry have in Colombia author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Article

Indicators

Related links

  • On index processCited by Google
  • Have no similar articlesSimilars in SciELO
  • On index processSimilars in Google

Share


Revista de Ciencias

Print version ISSN 0121-1935

Abstract

TORRES HERNANDEZ, Walter. Electrochemical Characterization of Mass Transport at Microelectrode Arrays. rev. cienc. [online]. 2014, vol.18, n.1, pp.101-110. ISSN 0121-1935.

Electrodes with dimensions in the micro- and nano-meter scale can be used as analytical probes in confined places such as cells and organelles. Arrays of microelectrodes, particularly disk-shaped electrodes, are now a platform to fabricate electrochemical sensors and multisensors. A useful characteristic of such arrays is that enhancement of the current signal is due to the fact that radial diffusion becomes important as the disk radius gets smaller and steady state currents are attainable in a relatively short time. Because there is no general analytical solution for the current response at MEAs, previous characterization of any micro electrode array at hand is still required. This paper discusses the electrochemical characterization of the mass transport of a reversible electrochemical probe at a commercially available micro-disk electrode array by two commonly used tools for electro analysis, namely: cyclic voltammetry and chronoamperometry. The questions to be addressed are whether clear radial diffusion control can be effectively achieved and the time required for the electrode system to reach steady state. For chronoamperometric experiments, the current response almost achieves steady state in the time range between 0.49 s and 1 s. This is precisely the time bracket in which analytical measurements should be made in order to achieve high sensitivity

Keywords : Microelectrode arrays.

        · text in English     · English ( pdf )

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License