Direct Covalent Immobilization of new Nitrogen-doped Carbon Nanodots by Electrografting for Sensing Applications
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 th...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2020 |
| País: | España |
| Institución: | Universidad Autónoma de Madrid |
| Repositorio: | Biblos-e Archivo. Repositorio Institucional de la UAM |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.uam.es:10486/709917 |
| Acceso en línea: | http://hdl.handle.net/10486/709917 https://dx.doi.org/10.1016/j.carbon.2019.12.053 |
| Access Level: | acceso abierto |
| Palabra clave: | Aryldiazonium salts Carbon nanodots Electrografting Electrochemilumiscence Química |
| Sumario: | 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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