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Ingeniería de brecha de banda de las nanocintas de grafeno mediante el control de la distorsión estructural
Yunbin Hu1,2, Peng Xie3, Marzio De Corato4,5
1Max Planck Institute for Polymer Research , Ackermannweg 10 , D-55128 Mainz , Germany.
Journal of the American Chemical Society
|May 22, 2018
Resumen
La introducción de una sutil distorsión estructural en las nanocintas de grafeno (GNR) a través de cadenas laterales de alquilo puede ajustar sus propiedades electrónicas. Esta modificación no plana reduce la brecha de banda, ofreciendo nuevas vías para la nanoelectrónica y la optoelectrónica.
Área de la Ciencia:
- Materiales electrónicos orgánicos
- Materiales semiconductores para la nanoelectrónica y la optoelectrónica
Sus antecedentes:
- Las nanocintas de grafeno (GNR) poseen propiedades sintonizables (movilidad, absorción óptica, brecha de banda) definidas por su estructura química.
- Los GNR planares han sido el foco principal, pasando por alto la no planaridad como parámetro de modulación de propiedades.
Objetivo del estudio:
- Investigar el impacto de la no planaridad en las propiedades del GNR.
- Explorar el uso de cadenas laterales de alquilo para inducir la distorsión estructural y ajustar las propiedades electrónicas.
Principales métodos:
- Estudios teóricos sobre las estructuras de GNR con bordes tipo cala y posiciones variables de la cadena lateral de alquilo.
- Síntesis experimental y caracterización de las RNG planas y no planas.
- Se utilizó la espectroscopia de excitación por absorción de UV frente al infrarrojo cercano y la fotoluminiscencia.
Principales resultados:
- Las cadenas de alquilo en las posiciones más internas del borde de la cala inducen la repulsión estérica, causando la flexión del anillo periférico.
- Esta distorsión estructural reduce teóricamente la brecha de banda GNR hasta en 0,27 eV.
- Los resultados experimentales corroboran la reducción teórica de la brecha de banda en GNR no planas.
Conclusiones:
- La distorsión estructural sutil, lograda a través de la no planaridad, es un método viable para la ingeniería de las propiedades GNR.
- Este enfoque ofrece un nuevo parámetro para el diseño de materiales semiconductores de próxima generación.
- Los GNR no planos presentan posibilidades mejoradas para aplicaciones nanoelectrónicas y optoelectrónicas.
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