The Importance of Surface Coverage in the Electrochemical Study of Chemically Modified Electrodes

Prodromidis, Mamas I.; Florou, Ageliki B.; Tzouwara-Karayanni, Stella M.; Karayannis, Miltiades I.

doi:10.1002/1521-4109(200012)12:18<1498::aid-elan1498>3.0.co;2-y

Cited by 56 publications

(25 citation statements)

References 11 publications

(11 reference statements)

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“…The degree of surface coverage (Γ*) of all modified and bare PGEs for electroreduction of 1×10 −6 M Imazethapyr was calculated by using following relationship :

true I_{p a} = (() n^{2} F^{2} / 4 R T) Γ^{^{*}} A ν

…”

Section: Resultsmentioning

confidence: 99%

Design of Electrochemically Modified fMWCNT‐pencil Graphite Electrode Decorated with Cu and Ag Nanofilm and its Electrocatalytic Behavior Towards Imazethapyr

2017

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Herein, a facile procedure was developed for designing an electrochemical sensor based on pencil graphite electrode modified with electrochemically synthesized silver and copper nanoparticles (AgNP and CuNP) supported on functionalized multiwalled carbon nanotubes (fMWCNTs). The electrochemical and morphological characterization was carried out by cyclic voltammetry, Electrochemical Impedance Spectroscopy, Powder X‐ray diffraction, Field Emission Scanning Electron Microscopy, Transmission electron microscopy and Atomic Force Microscopy. The designed sensor exhibited electrocatalytic behavior towards the reduction of Imazethapyr. Results indicates the combination of AgNPs, CuNPs and fMWCNTs on PGE produced remarkable enhancement in electrocatalytic and sensing properties. Various electro‐kinetic parameters like Rct, kapp, n, α, E0, k0, Γ, D and k have been evaluated by CV, impedance and Chronoamperometric studies. The electrochemical performance was improved by optimizing the effect of pH, scan rate, amount of fMWCNTs and deposition parameters of AgNP and CuNP. The sensor was efficaciously applied for determination of Imazethapyr and exhibited a linear correlation in the concentration range of 0.01–5.0 μg mL−1 with low detection limits, 0.159 ng mL−1 using AdSWV. The fabricated sensor exhibited good accuracy, acceptable stability and high efficacy for quantitative determination of Imazethapyr in real samples with notable recoveries ranging from 98 % to 100.2 %.

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“…The degree of surface coverage (Γ*) of all modified and bare PGEs for electroreduction of 1×10 −6 M Imazethapyr was calculated by using following relationship :

true I_{p a} = (() n^{2} F^{2} / 4 R T) Γ^{^{*}} A ν

…”

Section: Resultsmentioning

confidence: 99%

Design of Electrochemically Modified fMWCNT‐pencil Graphite Electrode Decorated with Cu and Ag Nanofilm and its Electrocatalytic Behavior Towards Imazethapyr

2017

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“…This phenomenon was more profound at the high scan rates [47]. According to the Q = G/nFA and assuming A = 0.08 cm 2 at a low scan rate of 10 mV s À1 , the surface coverage concentration of CB or TH were calculated.…”

Section: Electrochemical Properties Of the Gc/ruox/th Or Gc/ruox/cb Mmentioning

confidence: 99%

Electrochemical Detection of Persulfate at the Modified Glassy Carbon Electrode with Nanocomposite Containing Nano‐Ruthenium Oxide/Thionine and Nano‐Ruthenium Oxide/Celestine Blue

Roushani

Karami

2014

Electroanalysis

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The present study describes the fabrication of a sensitive amperometric sensor for the determination of persulfate. The immobilization surface was prepared by modifying a glassy carbon (GC) electrode with a nanocomposite containing ruthenium oxide (RuOx) nanoparticles and thionine (TH) or celestin blue (CB). The modified electrodes indicated excellent electrocatalytic activity toward persulfate reduction at a potential of +0.1 V. The proposed sensor showed detection limits of 1.46 µM for the GC/RuOx/TH modified electrode and 2.64 µM for the GC/RuOx/CB modified electrode. The sensitivities were obtained as 3 nA µM−1 at a concentration range of 10 µM to 11 mM for the GC/RuOx/TH modified electrode and 1 nA µM−1 at a concentration range of 10 µM to 6 mM for the GC/RuOx/CB modified electrodes.

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“…(2) (I p : CA current, n : scan rate, G : surface coverage, n : number of electrons transferred, A : surface area of Co-type azurin immobilization, F : Faraday constant, R : gas constant, T : temperature) [25,26]. According to Eq.…”

Section: Gavmentioning

confidence: 99%

Multifunctional 4-bit biomemory chip consisting of recombinant azurin variants

et al. 2011

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The Importance of Surface Coverage in the Electrochemical Study of Chemically Modified Electrodes

Cited by 56 publications

References 11 publications

Design of Electrochemically Modified fMWCNT‐pencil Graphite Electrode Decorated with Cu and Ag Nanofilm and its Electrocatalytic Behavior Towards Imazethapyr

Design of Electrochemically Modified fMWCNT‐pencil Graphite Electrode Decorated with Cu and Ag Nanofilm and its Electrocatalytic Behavior Towards Imazethapyr

Electrochemical Detection of Persulfate at the Modified Glassy Carbon Electrode with Nanocomposite Containing Nano‐Ruthenium Oxide/Thionine and Nano‐Ruthenium Oxide/Celestine Blue

Multifunctional 4-bit biomemory chip consisting of recombinant azurin variants

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