Electrostatically stabilized hybrids of carbon and maghemite nanoparticles: electrochemical study and application

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F17%3A73583506" target="_blank" >RIV/61989592:15310/17:73583506 - isvavai.cz</a>

Result on the web

<a href="http://pubs.rsc.org/-/content/articlehtml/2017/cp/c7cp01486d" target="_blank" >http://pubs.rsc.org/-/content/articlehtml/2017/cp/c7cp01486d</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/c7cp01486d" target="_blank" >10.1039/c7cp01486d</a>

Result language

angličtina

Original language name

Electrostatically stabilized hybrids of carbon and maghemite nanoparticles: electrochemical study and application

Original language description

Binary hybrids have been investigated for the past few decades due to the emerging properties of nanoparticle composites. Electrostatically stabilized core-shell nanostructures composed of surface active magnetic nanoparticles (SAMNs) and differently charged carbon nanomaterials display specific electrochemical properties. In this work, a set of binary hybrids that include a new class of magnetic nanoparticles is presented and the electrochemical features of the hybrids are reported. Gallic acid derived carbon dots (GA-CDs), PEG derived graphene dots (PEG-GDs), and quaternized carbon dots (Q-CDs) characterized by different charged groups were used for the preparation of different complexes with SAMNs. Thus, a set of six binary nanomaterials was obtained, and characterized by electrochemical impedance spectroscopy, cyclic voltammetry and chronoamperometry, demonstrating significant differences in the charge transfer resistance, capacitive current, electrochemical performance, and reversibility with respect to the isolated subunits. Among them, the combination of Q-CDs with an excess of SAMNs led to a Q-CD@SAMN hybrid, which displayed peculiar electrocatalytic properties attributable to the influence of the strong electrostatic interactions exerted by Q-CDs on the SAMN surface. Notwithstanding their small fraction (around 1% w/w), Q-CDs oriented the electrocatalysis of SAMNs toward the selective electro-oxidation of polyphenols at low applied potentials (+0.1 V vs. SCE). Finally, the Q-CD@SAMN hybrid was used for the development of a coulometric sensor for polyphenols, composed of a simple carbon paste electrode in a small volume electrochemical flow cell (1 mu L), and used for the complete direct electro-oxidation of polyphenols from plant extracts.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10403 - Physical chemistry

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physical Chemistry Chemical Physics

ISSN

1463-9076

e-ISSN

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Volume of the periodical

19

Issue of the periodical within the volume

18

Country of publishing house

GB - UNITED KINGDOM

Number of pages

10

Pages from-to

11668-11677

UT code for WoS article

000401022300070

EID of the result in the Scopus database

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