Designing Stable Redox-Active Surfaces: Chemical Attachment of an Osmium Complex to Glassy Carbon Electrodes Prefunctionalized by Electrochemical Reduction of anIn Situ-Generated Aryldiazonium Cation

Langmuir ◽  
2008 ◽  
Vol 24 (12) ◽  
pp. 6351-6358 ◽  
Author(s):  
Susan Boland ◽  
Frédéric Barrière ◽  
Dónal Leech
Keyword(s):  
Electrochemical Reduction ◽  
Glassy Carbon ◽  
Carbon Electrodes ◽  
Glassy Carbon Electrodes ◽  
Active Surfaces ◽  
Redox Active

Selective dopamine detection using aptamer-functionalized glassy carbon electrodes

2015 ◽  
Vol 93 (5) ◽  
pp. 572-577 ◽  
Author(s):  
Ryan Walsh ◽  
Uyen Ho ◽  
Xiao Li Wang ◽  
Maria C. DeRosa
Keyword(s):  
Ascorbic Acid ◽  
Electrochemical Detection ◽  
Glassy Carbon ◽  
Dna Aptamer ◽  
Carbon Electrodes ◽  
Glassy Carbon Electrodes ◽  
Organic Monolayer ◽  
Dopamine Detection ◽  
Redox Active ◽  
Viable Approach

The electrochemical detection of dopamine using glassy carbon electrodes suffers from a lack of selectivity toward the neurotransmitter, as interferences such as other catechol-containing neurochemicals and ascorbic acid can be oxidized at overlapping potentials. Several approaches have been employed to improve the selectivity of these electrodes towards dopamine including electrochemical pretreatment and organic monolayer depositions. Here, we characterize glassy carbon electrodes that were initially passivated through a trifluoromethylphenyl and nitrophenyl monolayer deposition and then functionalized with a specific DNA dopamine aptamer. Passivation with the mixed monolayer cuts off all signals from the redox-active neurochemicals. After functionalization with the DNA aptamer, the dopamine signal is restored and the electrodes are more responsive to dopamine than to any other related catechol-containing compounds or other common neurochemicals such as ascorbic acid. Our findings indicate that aptamer functionalization of glassy carbon electrodes may provide a viable approach for tuning the selectivity of electrochemical detection.

Novel studies about the electrochemical reduction of progesterone (P4) in acetonitrile at glassy carbon electrodes

2008 ◽  
Vol 619-620 ◽  
pp. 46-52 ◽  
Author(s):  
Fernando Javier Arévalo ◽  
Patricia Gabriela Molina ◽  
María Alicia Zón ◽  
Héctor Fernández
Keyword(s):  
Electrochemical Reduction ◽  
Glassy Carbon ◽  
Carbon Electrodes ◽  
Glassy Carbon Electrodes ◽  
Novel Studies

scholarly journals Impedance aspect of charge storage at graphite and glassy carbon electrodes in potassium hexacyanoferrate (II) redox active electrolyte

2016 ◽  
Vol 6 (1) ◽  
pp. 37 ◽  
Author(s):  
Katja Magdić ◽  
Višnja Horvat-Radošević ◽  
Krešimir Kvastek
Keyword(s):  
Glassy Carbon ◽  
Redox Reaction ◽  
Supporting Electrolyte ◽  
Carbon Electrodes ◽  
Charge Storage ◽  
Potassium Hexacyanoferrate ◽  
Impedance Spectra ◽  
Glassy Carbon Electrodes ◽  
Redox Active ◽  
Diffusion Impedance

<p class="PaperAbstract"><span lang="EN-GB">Different types of charge storage mechanisms at unmodified graphite vs. glassy carbon electrodes in acid sulphate supporting solution containing potassium hexacyanoferrate (II) redox active electrolyte, have been revealed by electrochemical impedance spectroscopy and supported by cyclic voltammetry experiments. Reversible charge transfer of Fe(CN)6<sup>3-/4-</sup> redox reaction detected by assessment of CVs of glassy carbon electrode, is in impedance spectra indicated by presence of bulk diffusion impedance and constant double-layer/pseudocapacitive electrode impedance compared to that measured in the pure supporting electrolyte. Some surface retention of redox species detected by assessment of CVs of graphite electrode is in impedance spectra indicated by diffusion impedance coupled in this case by diminishing of double-layer/pseudo­capacitive impedance compared to that measured in the pure supporting electrolyte. This phenomenon is ascribed to contribution of additional pseudocapacitive impedance generated by redox reaction of species confined at the electrode surface.</span></p>

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