scholarly journals Study on the adsorption and desorption process of thiol-modified probe on gold electrodes using cyclic voltammetric method

2015 ◽  
Vol 18 (1) ◽  
pp. 5-13
Author(s):  
Tien Huu Cao ◽  
Thien Quang Nguyen ◽  
Linh Van Ha ◽  
Hieu Van Le
Keyword(s):  
Electrochemical Properties ◽  
Electrode Surface ◽  
Electrochemical Methods ◽  
Gold Electrodes ◽  
Gold Nanowires ◽  
Cyclic Voltammetric ◽  
Desorption Process ◽  
Adsorption And Desorption ◽  
Voltammetric Method ◽  
Negative Voltage

In this paper, we study the electrochemical properties of selfassembling monolayers (SAM) created by the adsorption and desorption of the alkanethiol at the gold nanowires (AuNW) electrode surface by using the CV method. The analysis results show that the effectiveness of the desorption process reached over 90 %. The adoption of a negative voltage caused SAM desorption which resulted in the separation of SAM from the electrode. Our purpose is to reuse gold electrodes after they have been functionalized by SAM. Besides, results of this study also help to eliminate the electrochemical methods that make SAM eluted and therefore protect samples more effectively in the survey process.

scholarly journals Effect of Anodic Pretreatment on the Performance of Glassy Carbon Electrode in Acetonitrile and Electrooxidation of Para-substituted Phenols in Acetonitrile on Platinum and Glassy Carbon Electrode

2019 ◽  
Vol 65 (1) ◽  
pp. 133-138 ◽  
Author(s):  
László Kiss ◽  
Sándor Kunsági-Máté
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Electrode Surface ◽  
Platinum Electrode ◽  
Anodic Peak ◽  
Carbon Electrode ◽  
Substituted Phenols ◽  
Cyclic Voltammetric ◽  
Pretreatment Time

In the first part of the work electropolymerisation of phenol was studied at glassy carbon electrode. Rapid fouling of its surface indicated the formation of coherent poly(phenyleneoxide) layer which was demonstrated by the repeated cyclic voltammetric scans. Effect of anodic pretreatment potential in acetonitrile solvent was also investigated and the results showed that at potentials higher than 2 V glassy carbon electrode becomes deactivated. Preanodisation of glassy carbon electrode at 3 V in acetonitrile resulted in diminished anodic peak currents by phenols. It was due to the partial deactivation of electrode surface and its extent increased with the pretreatment time. The electrooxidation of para-substituted phenols (p-Cl-phenol, p-NO2-phenol, p-tertbutylphenol, p-methoxyphenol) in acetonitrile resulted in no fouling layer on platinum electrode and the peak currents were significantly higher than in the first scan of unsubstituted phenol in the same concentration. Glassy carbon deactivated continuously by repeating the scans due to the solvent and bonding of products on the surface.

Electrochemical properties and topology of gold electrodes with adsorbed penicillin G for biosensor applications

2007 ◽  
Vol 120 (2) ◽  
pp. 621-627 ◽  
Author(s):  
W.M. Hassen ◽  
A. Abdelghani ◽  
L. Vonna ◽  
K. Cherif ◽  
M. Boussaid ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Penicillin G ◽  
Gold Electrodes ◽  
And Topology ◽  
Biosensor Applications

Coordination polymers of 5-substituted 1,2,3,4-tetracyanocyclopentadienides: structural and electrochemical properties of complex compounds of 5-amino- and 5-nitro-tetracyanocyclopentadienide

2021 ◽  
Author(s):  
Patrick Nimax ◽  
Nils Rotthowe ◽  
Florian Zoller ◽  
Tobias Blockhaus ◽  
Friedrich Ernst Wagner ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Mössbauer Spectroscopy ◽  
Electrochemical Properties ◽  
Coordination Polymers ◽  
Mossbauer Spectroscopy ◽  
Complex Compounds ◽  
Electrochemical Methods ◽  
Mößbauer Spectroscopy

Compounds of the 5-amino- (ATCC) and 5-nitro-1,2,3,4-tetracyanocyclopentadienide (NTCC) ligand with iron(II) and iron(III), silver(I) and potassium(I) were prepared and characterized by electrochemical methods using EPR, cyclic voltammetry and Mößbauer spectroscopy...

Surface electrochemistry and electrocatalytic activity of ion pairs formed from oppositely-charged phthalocyanine and porphyrin species

2007 ◽  
Vol 11 (03) ◽  
pp. 151-159 ◽  
Author(s):  
Junsheng Chen ◽  
A. B. P. Lever
Keyword(s):  
Electrochemical Properties ◽  
Electrode Surface ◽  
Electrocatalytic Activity ◽  
Electrocatalytic Oxidation ◽  
Graphite Electrode ◽  
Ion Pairs ◽  
Oxalate Anion ◽  
Surface Electrochemistry ◽  
The Individual ◽  
Oppositely Charged

Self-assembled ion pairs are deposited onto a graphite electrode surface by dipping the electrode sequentially into phthalocyanine cations and anions, or a phthalocyanine cation and porphyrin anion. The electrochemical properties of these surface-bound ion pairs are compared with the properties of the individual surface-bound components. The order of deposition is shown to be crucial, implying that these species lie flat on the surface. A detailed study of the electrocatalytic oxidation of oxalate anion is used to explore their reactivity as a function of deposition order.

Surface-enhanced Raman scattering-active desert-rose-like Ag mesoparticles prepared using cyclic voltammetric methods

RSC Advances ◽  
2015 ◽  
Vol 5 (113) ◽  
pp. 93293-93300 ◽  
Author(s):  
You-Hong You ◽  
Yang-Wei Lin ◽  
Chung-Yu Chen
Keyword(s):  
Thermal Stability ◽  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Aging Behavior ◽  
Cyclic Voltammetric ◽  
Voltammetric Method ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Voltammetric Methods

Desert-rose-like Ag mesoparticles prepared by cyclic voltammetric method possess excellence SERS-activity, reproducibility, thermal stability and aging behavior.

The electrochemical behavior of flavin adenine dinucleotide in neutral solutions

1988 ◽  
Vol 66 (1) ◽  
pp. 86-96 ◽  
Author(s):  
V. I. Birss ◽  
H. Elzanowska ◽  
R. A. Turner
Keyword(s):  
Electrochemical Behavior ◽  
Electrode Surface ◽  
Flavin Adenine Dinucleotide ◽  
Cyclic Voltammetric ◽  
Kinetics Of Oxidation ◽  
Glassy Carbon Electrodes ◽  
Peak Separation ◽  
Standard Rate ◽  
Kinetics Of ◽  
Standard Rate Constant

A detailed investigation of the electrochemical behavior of flavin adenine dinucleotide (FAD) in neutral solutions has been carried out at Hg and glassy carbon electrodes. At FAD concentrations of about 10−4 M, cyclic voltammetry (CV) shows a pair of anodic and cathodic peaks having a peak separation at low sweep rates indicative of a two-electron transfer process and yielding a formal redox potential for FAD of −0.206 ± 0.003 V vs. NHE at pH 7. Evidence for FAD adsorption was obtained in experiments at high sweep rates, from the effect of time of exposure of the electrode surface to FAD in solution and from the effect of the potential limits on the cyclic voltammetric response. The process of FAD adsorption was studied in detail in dilute FAD solutions (ca 10−6 M) using a hanging mercury drop electrode and the techniques of CV and ac voltammetry. Three distinct stages of FAD adsorption were observed and a model of the orientation of FAD on the electrode surface as a function of time and potential is presented. In addition, the kinetics of oxidation and reduction of adsorbed FAD was studied for each of the stages of FAD deposition, and a surface standard rate constant of ca. 40 s−1 was obtained for Stages II and III of FAD adsorption.

The study of monochlorinated phenols using hyphenated electrochemical method

2011 ◽  
Vol 76 (8) ◽  
pp. 997-1012
Author(s):  
Matilda Roziková ◽  
Pavel Janderka ◽  
Libuše Trnková
Keyword(s):  
Electrode Surface ◽  
Electrochemical Method ◽  
Quartz Crystal ◽  
Film Formation ◽  
Electrochemical Quartz Crystal Microbalance ◽  
Polymeric Film ◽  
Low Permeability ◽  
Pt Electrode ◽  
Cyclic Voltammetric ◽  
Strong Adsorption

Cyclic voltammetric (CV) study of electrooxidation of monochlorophenols (2-chlorophenol, 3-chlorophenol, 4-chlorophenol) on a Pt electrode in 0.5 M H2SO4 was combined with the experiment using electrochemical quartz crystal microbalance (EQCM). For all chlorophenols the polymeric film formation on the electrode surface has been observed and the electrode surface was completely covered with polymeric film after five cycles. Partial deactivation of the electrode resulting in the formation of the more permeable film was created in the case of 2-chlorophenol and the film of 4-chlorophenol was created also with the low permeability. The influence of the scan rate on the electrooxidation of chlorophenol was evaluated. It was found that the lower electropolymerization rate and better permeability of the film was observed at higher scan rates. Valuable insights into complex electrooxidation processes of all chlorophenols were also gained by means of the elimination voltammetry with linear scan (EVLS). The EVLS functions, eliminating two current components, reveal a strong adsorption state of 3-chlorophenol and show differences in electrochemical behavior of chlorophenols in all cycles. From the comparison of elimination results of corresponding derivatives the different mechanism of electrooxidation was suggested.

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