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Principios unificadores de la funcionalización reductiva del grafeno covalente
Gonzalo Abellán1,2, Milan Schirowski1,2, Konstantin F Edelthalhammer1,2
1Department of Chemistry and Pharmacy, Friedrich-Alexander University of Erlangen-Nürnberg, Institute of Organic Chemistry , Henkestrasse 42, 91054 Erlangen, Germany.
Journal of the American Chemical Society
|March 22, 2017
Resumen
Los derivados del grafeno fueron sintetizados utilizando rutas reductivas. Los yoduros de alquilo produjeron los mejores resultados de funcionalización, mostrando adición covalente reversible y potencial para la modificación controlada del grafeno.
Área de la Ciencia:
- Ciencias de los materiales
- Nanotecnología
- Química orgánica
Sus antecedentes:
- Los derivados del grafeno se sintetizan a través de rutas reductoras utilizando compuestos de intercalación de grafito (GIC).
- Evaluar el grado de funcionalidad y la homogeneidad es crucial para las aplicaciones de grafeno.
Objetivo del estudio:
- Comparar la arilación del grafeno y la alquilación utilizando varios electrófilos.
- Centrarse en evaluar el grado de adición y la homogeneidad de la funcionalidad a granel (H_bulk).
- Investigar la reversibilidad y el mecanismo de la química de adición covalente.
Principales métodos:
- Compuestos de intercalación de grafito utilizados (GIC), específicamente KC8.
- Se utiliza la espectroscopia estadística de Raman (SRS) para la evaluación de la homogeneidad.
- Se utilizó análisis termogravimétrico junto con FT-IR, cromatografía de gases y espectrometría de masas (TGA/FT-IR/GC/MS) para una caracterización detallada.
Principales resultados:
- La funcionalización del grafeno con ioduros de alquilo proporcionó resultados superiores en el grado de adición y la homogeneidad en masa (H_bulk).
- Química de adición covalente reversible demostrada por debajo de 200 °C.
- Identificación de la escisión y la dimerización de las extremidades homolíticas, indicando la regioselectividad y la homogeneidad de la hoja inferior (H_sheet).
Conclusiones:
- La alquilación reductiva utilizando yoduros de alquilo es un método eficaz para la funcionalización del grafeno.
- La naturaleza reversible de la adición covalente ofrece nuevas posibilidades para la modificación del grafeno.
- Desarrolló el concepto de películas de grafeno CVD monocapa, proporcionando ideas para futuras estrategias de funcionalización del grafeno.
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