Modelling of the initial stages of the electropolymerization mechanism of o-phenylenediamine

Camurri, Giulio; Ferrarini, Paolo; Giovanardi, Roberto; Benassi, Rois; Fontanesi, Claudio

doi:10.1016/j.jelechem.2005.08.016

Cited by 41 publications

(24 citation statements)

References 24 publications

(38 reference statements)

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“…A similar comparison of CVs, recorded with graphite electrodes for oPD and the 2-e catechol oxidation at pH 5.5, led to the same conclusion that a 2-e transfer was a likely mechanism for oPD peak-1 [87]. The mechanisms of phenylenediamine electrochemistry have been studied previously [44,46,47,50,88], and detailed investigations have demonstrated the extreme complexity of this system [46,84]. The main focus of the present work, however, was determining the permselectivity of the PoPD films formed at different applied potentials under the present conditions.…”

Section: Electrosynthesis Of Popd Using Cyclic Voltammetrysupporting

confidence: 56%

“…The first irreversible electron transfer for oPD has been proposed to correspond to the oxidation of the parent amino group to the radical cation, and reports suggest that for any pH condition this is followed by radical coupling to give a dimer, which can undergo either chain propagation or be further oxidized to give various other dimer species of varying oxidation states [45,46,84]. An alternative explanation for the electro-oxidation behavior of oPD [85] suggests that the narrower peak-1, observed at low oPD concentrations (Fig.…”

Section: Electrosynthesis Of Popd Using Cyclic Voltammetrymentioning

confidence: 99%

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Effects of polymerization potential on the permselectivity of poly(o-phenylenediamine) coatings deposited on Pt–Ir electrodes for biosensor applications

Rothwell

McMahon

O’Neill

2010

Electrochimica Acta

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Section: Electrosynthesis Of Popd Using Cyclic Voltammetrysupporting

confidence: 56%

Section: Electrosynthesis Of Popd Using Cyclic Voltammetrymentioning

confidence: 99%

Effects of polymerization potential on the permselectivity of poly(o-phenylenediamine) coatings deposited on Pt–Ir electrodes for biosensor applications

Rothwell

McMahon

O’Neill

2010

Electrochimica Acta

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“…In subsequent cycles, the peak current decreases, making it virtually undetectable after the tenth cycle. This behaviour is consistent with formation of the electrically insulating polymer film on the electrode surface[25][26]. No remarkable difference was observed in the general attitude of the CVs obtained during the electropolymerization of the NIP-GCE sensor, except that the amount of charge consumed during MIP formation is higher than in the case of NIP, due to an increased current response that occurs at a lower potential.…”

supporting

confidence: 81%

Molecularly Imprinted Poly‐o‐phenylenediamine Electrochemical Sensor for Entacapone

Radi

Abd-Ellatief

2021

Electroanalysis

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We have developed a molecularly imprinted polymer (MIP) electrochemical sensor for entacapone (ETC) based on an electropolymerised polyphenylenediamine (Po‐PD) on a glassy carbon electrode (GCE) surface. The direct electropolymerisation of the o‐phenylenediamine monomer (o‐PD) was carried out with ETC as a template. The steps of electropolymerization process, template removal and binding of the analyte were tested by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) using [Fe(CN)6]3−/[Fe(CN)6]4 − as a redox probe. The operation of the sensor has been investigated by differential pulse voltammetry (DPV). Under optimal experimental conditions, the response of the DPV was linearly proportional to the ETC concentration between 1.0×10−7 and 5.0×10−6 M ETC with a limit of detection (LOD) of 5.0×10−8 M. The developed sensor had excellent selectivity without detectable cross‐reactivity for levodopa and carbidopa. The MIP sensor was successfully used to detect ETC in spiked human serum samples.

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“…Effect of PPD polymerization potential on the selectivity of Pt D /PPD-BSA The structure of PPD films and their mechanisms of formation are known to be complex, and have been studied in some detail by many authors [34][35][36][37][38][39][40][41][42]. The properties of PPD have been suggested to depend mainly on the conditions of the polymerization, such as pH, electrolyte composition, temperature and the applied potential.…”

Section: Pt D /Nafion/pei/gluox/ppd-bsamentioning

confidence: 99%

Highly selective and stable microdisc biosensors for l-glutamate monitoring

Govindarajan

McNeil

Lowry

et al. 2013

Sensors and Actuators B: Chemical

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a b s t r a c tGlutamate mediates most of the excitatory synaptic transmission in the brain, and its abnormal regulation is considered a key factor underlying the appearance and progression of many neurodegenerative and psychiatric diseases. In this work, a microdisc-based amperometric biosensor for glutamate detection with highly enhanced selectivity and good stability is proposed. The biosensor utilizes the enzyme glutamate oxidase which was dip-coated onto 125 m diameter platinum discs. To improve selectivity, phosphatidylethanolamine was pre-coated prior to enzyme deposition, and electropolymerization of o-phenylenediamine was performed to entrap the enzyme within a polymer matrix. A variety of coating configurations were tested in order to optimize biosensor performance. For stability measurements, biosensors were biased continuously and calibration curves calculated each day for a period of 5-6 days. The optimized biosensors exhibited very high sensitivity (71 ± 1 mA M −1 cm −2 ), low detection limit of ∼2.5 M glutamate, selectivity (over 87% against ascorbic acid), very good temporal stability during continuous use, and a response time of <5 s. These biosensors are therefore good candidates for further development as devices for continuous monitoring during traumatic brain injury or neurosurgery.

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Modelling of the initial stages of the electropolymerization mechanism of o-phenylenediamine

Cited by 41 publications

References 24 publications

Effects of polymerization potential on the permselectivity of poly(o-phenylenediamine) coatings deposited on Pt–Ir electrodes for biosensor applications

Effects of polymerization potential on the permselectivity of poly(o-phenylenediamine) coatings deposited on Pt–Ir electrodes for biosensor applications

Molecularly Imprinted Poly‐o‐phenylenediamine Electrochemical Sensor for Entacapone

Highly selective and stable microdisc biosensors for l-glutamate monitoring

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