Immobilisation of Alkylamine-Functionalised Osmium Redox Complex on Glassy Carbon using Electrochemical Oxidation

Kumar, Rakesh; Leech, Dónal

doi:10.1016/j.electacta.2014.03.090

Cited by 10 publications

(6 citation statements)

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“…The shoulder in the peak suggests a two-electron transfer process, corresponding to the individual oxidations of the amine and EDOT moieties. It has been reported that the electrochemical oxidation of amines results in the immobilization of nitrogen-containing species onto a variety of substrates including carbon (55)(56)(57)(58), platinum (48), gold (59), and ITO (60). As shown in Scheme 2, the proposed electrografting mechanism involves an electron transfer process through which an NH 2 radical cation is generated.…”

Section: Resultsmentioning

confidence: 99%

Enhanced PEDOT adhesion on solid substrates with electrografted P(EDOT-NH ₂ )

et al. 2017

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Section: Resultsmentioning

confidence: 99%

Enhanced PEDOT adhesion on solid substrates with electrografted P(EDOT-NH ₂ )

et al. 2017

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“…At higher scan rates, the peak currents scale linearly with the square root of scan rate, indicative of semiinfinite diffusion control of the response, as expected for multi-layered films on electrodes [24,25]. Osmium complex surface coverage (Г Os ), calculated by integration of the charged passed under the redox complex oxidation peak using slow scan rate voltammetry in PBS solution [25], is comparable to values obtained previously [18] and approximately one thousand-fold that expected for monolayer coverage of osmium polypyridyl complexes [26,27]. Upon addition of glucose substrate to the PBS electrolyte, a sigmoidal-shaped slow-scan rate cyclic voltammogram characteristic of electrocatalytic oxidation of glucose is obtained for all enzyme electrodes, Fig.…”

Section: Enzyme Electrode Electrochemistrymentioning

confidence: 84%

A glucose anode for enzymatic fuel cells optimized for current production under physiological conditions using a design of experiment approach

Kumar

Leech

2015

Bioelectrochemistry

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“…As shown in this figure, the XPS spectrum shows the appearance of a new peak corresponding to N1s and which increases with the DNA incubation. The nitrogen signal was decomposed by a fitting program into two different peaks: a main peak at 399 eV attributed to (N−C=C) and related to the amine attached to aromatic ring of the PPP and the second peak at 401 eV attributed to the protonation of the amine through the grafting process . The same behavior has been observed with redox polymer Fc‐PPP as shown in our previous work .…”

Section: Resultsmentioning

confidence: 99%

Functionalization of MWCNTs with Ferrocene‐poly(p‐phenylene) and Effect on Electrochemical Properties: Application as a Sensing Platform

et al. 2016

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1Introduction Nanostructures such as carbon nanotubes (CNTs) have been extensively used as transducers for electrochemical biosensing analysis [1].T hese nanomaterials offer al arge surface-to-volumer atio and exhibit excellent chemical and thermal stability [2].M oreover, they have electronic properties leading to the enhancement of electron transport. Thus,m ulti-walled carbon nanotubes (MWCNTs) are appropriate nanomaterials for covalent binding of redox proteins and mediators [3].O ne of the challenges with employing CNTsi nab iosensor device is the individual dispersion of nanotubes and the introduction of functional groups such as redox mediators.C NTs are insoluble in aqueous and polar media and have at endency to form agglomerates due to hydrophobic interactions and Va nder Waals forces between nanotubes.Different approaches have been employed for their dispersion in the solution [ 4,5].T he most common method to disperse carbon nanotubesi nt he solution is to modify them chemically.Amajor strategyc onsists in the oxidation of carbon nanotubes by the oxygen of the air in concentrated sulfurica cid, nitric acid, aqueous hydrogenp eroxide,o rt he mixture of acids [6].D uring these reactions variousc hemicalg roupsa re formed on CNTs surface such as carboxylic, ketones,e sters,a ldehydes,a lcohol groups [7-9].T he polar carboxylic groups protect carbon nanotubes from aggregation and allow high dispersion in aqueous medium or organic solvents.T he functionalization of carbon nanotubes is facilitatedb ym any defects at the end caps of CNTs [10].E nd capsh ave at endency to be composed of highlyc urved fullerene like hemispheres, which are also highly-reactive as compared to the sidewalls.S uch drastic conditionsa sa cid oxidation and sonication leads to thef ormation of functional groups at the end capso fC NTs,b yo pening the tube caps as well as the formation of holesi nt he sidewalls.T he efficiency of functionalization depends also on the size of carbon nanotubes (the reactivity of CNTs increase with as mall nanotubed iameter) and their chirality [11].A dditionally, oxidative conditions have al arge influence on the electronic properties of the carbon nanotubes with ad ecrease in their conductivity.N on-covalent functionalizationo f nanotubes is of particular interestb ecause it does not include the physical properties of CNTs[ 12],b ut improves the solubility and the process ability.T his type of functionalization mainly involves surfactants,c hargedm acromolecules and polymers,a romatic compounds.I tc onsists of Va nd er Waals,e lectrostatic interactions, and p-stacking. Thel etterc an be obtainedb yt heir interaction with organic compounds such as methalloporphyrins [13] or Abstract:M WCNTsh ave been dispersed with modified ferrocene-poly(para-phenylene) by p staking interaction to improve dispersion of MWCNTS in organic solution. Such interaction has been demonstrated through electrochemical and chemical characterizationo ft he composite. Al ayer based on the formed composite (MWCNTs/Fc-PPP) has been de...

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Immobilisation of Alkylamine-Functionalised Osmium Redox Complex on Glassy Carbon using Electrochemical Oxidation

Cited by 10 publications

References 50 publications

Enhanced PEDOT adhesion on solid substrates with electrografted P(EDOT-NH ₂ )

Enhanced PEDOT adhesion on solid substrates with electrografted P(EDOT-NH ₂ )

A glucose anode for enzymatic fuel cells optimized for current production under physiological conditions using a design of experiment approach

Functionalization of MWCNTs with Ferrocene‐poly(p‐phenylene) and Effect on Electrochemical Properties: Application as a Sensing Platform

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Immobilisation of Alkylamine-Functionalised Osmium Redox Complex on Glassy Carbon using Electrochemical Oxidation

Cited by 10 publications

References 50 publications

Enhanced PEDOT adhesion on solid substrates with electrografted P(EDOT-NH 2 )

Enhanced PEDOT adhesion on solid substrates with electrografted P(EDOT-NH 2 )

A glucose anode for enzymatic fuel cells optimized for current production under physiological conditions using a design of experiment approach

Functionalization of MWCNTs with Ferrocene‐poly(p‐phenylene) and Effect on Electrochemical Properties: Application as a Sensing Platform

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Enhanced PEDOT adhesion on solid substrates with electrografted P(EDOT-NH ₂ )

Enhanced PEDOT adhesion on solid substrates with electrografted P(EDOT-NH ₂ )