Direct functionalization of Mn12-(methacrylate) clusters on Si(100): surface characterization and electrochemical properties
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| Autores: | , , , |
|---|---|
| Formato: | artículo original |
| Fecha de Publicación: | 2016 |
| Descripción: | The reaction of H–terminated Si(100) with methacrylate–substituted manganese carboxylate clusters [Mn12O12{CH2C(CH3)COO}16(H2O)4], [Mn12–(methacrylate)] via hydrosilylation afforded Mn12–(methacrylate)−Si(100). The chemically modified surface was studied with an atomic force microscope (AFM), X–ray photoelectron spectra (XPS), a cyclic voltammeter (CV) and electrochemical impedance spectra (EIS). XPS show several Mn and Si electronic signatures that indicate the tailoring of Mn12–(methacrylate) on the surface. The CV plot of Mn12–(methacrylate)−Si(100) has two irreversible cathodic waves at −0.76 and −0.44 V, assigned to Mn(IV)/Mn(III) and Mn(III)/Mn(II) processes. The calculated charge at –0.44 V was 3.14 x 10–5 C cm–2. An equivalent-circuit model was proposed based on EIS data and element circuit analysis. EIS show that the electronic and structural features of Mn12–(methacrylate) on a surface greatly influence the electron transfer. |
| País: | Kérwá |
| Institución: | Universidad de Costa Rica |
| Repositorio: | Kérwá |
| OAI Identifier: | oai:kerwa.ucr.ac.cr:10669/76677 |
| Acceso en línea: | https://revistas.ucr.ac.cr/index.php/cienciaytecnologia/article/view/24917 https://hdl.handle.net/10669/76677 |
| Palabra clave: | Silicon(100) Mn12 cluster Electrochemical impedance spectra (EIS) Cyclic voltammetry X–ray photoelectron spectra (XPS) Espectroscopía de impedancia electroquímica (EIS) Espectroscopía fotoelectrónica de Rayos-X (XPS) Silicio (100) Complejo Mn12 Voltametría cíclica 540 Química |