Spectroelectrochemical operando method for monitoring a phenothiazine electrografting process on amide functionalized C-nanodots/Au hybrid electrodes
| Autor: | Mónica Mediavilla, Eva Mateo-Martí, Emiliano Martínez-Periñán, Iria Bravo, Félix Pariente, Encarnación Lorenzo, Mónica Revenga-Parra |
|---|---|
| Přispěvatelé: | UAM. Departamento de Química Analítica y Análisis Instrumental |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
General Chemical Engineering Electrografting Diazonium salt Azure A 02 engineering and technology 010402 general chemistry Photochemistry Electrochemistry Carbon nanodots 01 natural sciences Nanomaterials chemistry.chemical_compound Adsorption Phenothiazine Spectroelectrochemistry Aryl Química 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Electrode Nanodot 0210 nano-technology |
| Zdroj: | Biblos-e Archivo: Repositorio Institucional de la UAM Universidad Autónoma de Madrid Repositorio Institucional del Instituto Madrileño de Estudios Avanzados en Nanociencia instname Biblos-e Archivo. Repositorio Institucional de la UAM Universitat Autònoma de Barcelona |
| Popis: | Phenothiazine derivatives are extensively explored dye molecules, which present interesting electrochemical and optical properties. In recent years, the possibility of transforming some phenothiazines in their aryl diazonium salt derivatives has been proved, what allows them to be electrochemically reduced and electrografted onto conductive surfaces. This is a smart way to modify these surfaces and enable them with specific functionalities. In order to better comprehend the electrografting process and consequently have a higher control of it, in this work we have carried out an exhaustive study by operando UV–Vis spectroelectrochemistry of the electrografting of a phenothiazine aryl diazonium salt onto amide carbon nanodots. As a model of phenothiazine dye we have chosen Azure A. The electrografting onto carbon nanodots has been stablished by comparison with the results obtained on bare gold electrodes in this novel study. The presence of carbon dots improves the reversibility of the electrochemical process as derived from the results obtained by operando UV–Vis spectroelectrochemistry. In addition, to asses that the electrochemical process studied corresponds to the electrografting, the results have been compared to those obtained for the simple Azure A adsorption. This study shows the advantages of obtaining simultaneously the electrochemical and the spectroscopic evolution of an electron-transfer process in a single experiment, in a particular electrochemical reaction. This work could be the starting point for the study of the electrografting on other nanomaterials Funding from the Spanish Ministerio de Ciencia, Innovación y Universidades (project: CTQ2017-84309-C2-1-R) and Comunidad Autónoma de Madrid (NANOAVANSENS Program) is acknowledged. IMDEA Nanociencia acknowledges support from the 'Severo Ochoa' Programme for Centres of Excellence in R&D (Ministerio de Ciencia, Innovación y Universidades, Grant SEV-2016-0686) |
| Databáze: | OpenAIRE |
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