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Dependencia entre la estructura de transferencia de carga y la reactividad de las heterojunciones de nanotubos de
Andrew J Hilmer1, Kevin Tvrdy, Jingqing Zhang
1Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Journal of the American Chemical Society
|July 16, 2013
Resumen
La transferencia de carga entre los nanotubos de carbono de pared única (SWCNT) y los fullerenos es clave para la optoelectrónica. El metanofullereno C85 muestra una mayor transferencia de electrones y eficiencia de apagado con los SWCNT, a diferencia de los derivados de fullereno más pequeños.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Nanotecnología La nanotecnología es la nanotecnología.
- Química Física es la química física.
Sus antecedentes:
- La transferencia de carga en las interfaces de nanotubos de carbono de pared única (SWCNT) y fullereno es crucial para los dispositivos fotovoltaicos y optoelectrónicos.
- Dispersar los fullerenos y los SWCNT a nivel de una sola entidad en solución es un desafío, pero necesario para un estudio detallado.
- Comprender las relaciones estructura-reactividad es vital para optimizar estos materiales híbridos.
Objetivo del estudio:
- Para sintetizar e investigar la transferencia de electrones entre SWCNTs de quiralidad específica y varios anfifiles de metanofullereno.
- Para establecer una relación estructura-reactividad para las heterojunciones fullereno-SWCNT.
- Evaluar el potencial de diferentes derivados de fullereno para aplicaciones optoelectrónicas basadas en SWCNT.
Principales métodos:
- Síntesis de anfífilos de metanofullereno, incluidos los derivados de C60, C70 y C84.
- Investigación espectroscópica de la transferencia de electrones entre SWCNTs funcionalizados y anfifiles de fullereno sintetizados en solución acuosa.
- Aplicación de la teoría de Marcus para modelar y predecir la dinámica de transferencia de electrones.
Principales resultados:
- El lipid-C61-polietilenglicol (PEG) y el lipid-C71-PEG mostraron apagado incompleto en todas las especies de SWCNT, lo que indica una pequeña fuerza impulsora para la transferencia de electrones.
- La teoría de Marcus apoyó estos hallazgos, prediciendo compensaciones de energía más pequeñas que la energía de unión del excitón en SWCNTs.
- La interfaz de SWCNT con C85 metanofullereno resultó en el apagado completo de todos los SWCNT semiconductores, atribuido a un nivel LUMO más profundo.
Conclusiones:
- La eficiencia de transferencia de electrones es fuertemente dependiente del peso molecular del derivado del fullereno y el nivel LUMO.
- El metanofullereno C85 demuestra un rendimiento superior en el apagado de los SWCNT semiconductores en comparación con los aductos de fullereno más pequeños.
- Estos hallazgos resaltan la promesa del metanofullereno C85 para el desarrollo de heterojunciones avanzadas de SWCNT-fullereno en optoelectrónica.
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