Direct Covalent Immobilization of new Nitrogen-doped Carbon Nanodots by Electrografting for Sensing Applications
Entity
UAM. Departamento de Química Analítica y Análisis InstrumentalPublisher
ElsevierDate
2020Citation
10.1016/j.carbon.2019.12.053
Carbon 159 (2020): 303-310
ISSN
0008-6223DOI
10.1016/j.carbon.2019.12.053Funded by
This work has been supported by the Spanish Ministerio de Ciencia, Innovación y Universidades through projects CTQ2017-84309-C2-1-R and RED2018-102412-T, and Comunidad Autónoma de Madrid (S2018/NMT-4349 TRANSNANOAVANSENS-CM Program and 2017-T1/BIO-5435 Atracción de Talento Project). The authors thank Professor Hector Abruña the critical review of this workProject
Gobierno de España. CTQ2017-84309-C2-1-R; Gobierno de España. RED2018-102412-T; Comunidad de Madrid. S2018/NMT-4349; Comunidad de Madrid. 2017-T1/BIO-5435Editor's Version
https://doi.org/10.1016/j.carbon.2019.12.053Subjects
Aryldiazonium salts; Carbon nanodots; Electrografting; Electrochemilumiscence; QuímicaRights
© 2020 ElsevierEsta obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional.
Abstract
This paper reports a facile strategy to covalently immobilize nanosized carbon dots (CD) onto carbon conductive surfaces for sensing applications. The carbon nanodots designed with surface amine groups (N-CD) can be electrografted onto carbon electrodes and, thus, easily covalently immobilized on these conductive surfaces. They have been synthetized by a carbonization method microwave-assisted using preselected low cost and biocompatible precursors, such as D-fructose as primary carbon source and urea as N-donor reagent to obtain peripheral enriched nitrogen CD. The synthetized nanomaterial has been characterized by different techniques, that confirm the presence of size-regular amorphous structures with blue fluorescence when are irradiated with UV light. The highly stable immobilization of N-CD onto the electrode surfaces by electrografting provides hybrid electrodes with greater relative surface area and improved electron transfer properties, demonstrating to be a great promise for electrochemical sensing. Because of its good electrical conductivity, electrical properties, abundant edges sites and high catalytic activity, N-CD immobilized on carbon electrodes efficient amplify the electrochemiluminiscence (ECL) signal from the luminophore [Ru(bpy)3]2+ in a taurine sensor. A linear concentration range from 126 to 1000 μM, a sensitivity of 7.40ⅹ10-4 μM-1 and a detection limit of 37.8 μM were determined for the taurine sensor
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Google Scholar:Gutiérrez Sánchez, María Cristina
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Mediavilla, Mónica
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Guerrero Esteban, Tamara
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Revenga Parra, Mónica
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Pariente Alonso, Félix
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Lorenzo Abad, Encarnación
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