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Funcionalización selectiva por quiralidad de nanotubos de carbono semiconductores con una molécula conmutable por

Lyndsey R Powell¹, Mijin Kim¹, YuHuang Wang^1,2

¹Department of Chemistry and Biochemistry, University of Maryland , 8051 Regents Drive, College Park, Maryland 20742, United States.

Journal of the American Chemical Society

|August 29, 2017

Resumen

Los investigadores desarrollaron una nueva química covalente para la funcionalización selectiva de la quiralidad de los nanotubos de carbono de pared única (SWCNT). Este método bajo demanda utiliza un pH y un diazoéter activado por luz para modificar con precisión tipos específicos de SWCNT.

Área de la Ciencia:

Ciencias de los materiales
Química orgánica
Nanotecnología

Sus antecedentes:

La funcionalización selectiva de la quiralidad de los nanotubos de carbono semiconductores de pared única (SWCNT) ha sido un desafío sintético significativo durante más de una década.
El control preciso de la funcionalidad SWCNT es crucial para aplicaciones avanzadas en electrónica y ciencia de materiales.

Objetivo del estudio:

Desarrollar una química covalente bajo demanda para la funcionalización selectiva de quiralidades específicas de nanotubos de carbono de una sola pared (SWCNT).
Permitir la adaptación química precisa de los SWCNT en el nivel de quiralidad único para aplicaciones avanzadas.

Principales métodos:

Síntesis y aislamiento de un isómero de diazoéter químicamente inerte.
Cambio in situ del diazoéter a su forma reactiva utilizando el pH y la luz visible, sintonizado con la frecuencia óptica del SWCNT.
Monitoreo de la finalización de la reacción a través de la fotoluminiscencia sensible al defecto, logrando una funcionalización de < 0,01% de los átomos de carbono.

Principales resultados:

Química de diazoéter impulsada ópticamente para la funcionalización selectiva de SWCNT dentro de las mezclas.
Se logró una funcionalización casi completa de los menos reactivos (7,3) -SWCNT sobre los altamente similares (6,5) -SWCNT mediante el control de la reacción con la luz.
Demostró la capacidad de inhibir la reacción en ausencia de luz, asegurando una alta selectividad.

Conclusiones:

La química covalente desarrollada bajo demanda proporciona un avance para la funcionalización precisa y selectiva de la quiralidad de los SWCNT.
Este método abre nuevas vías para la clasificación de SWCNT, la pasivación en el chip y la litografía a nanoescala al permitir propiedades de SWCNT a medida.

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