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Interfaz de dichalcogenuros de metales de transición con nanodotos de carbono para la gestión de la energía inducida

Lorenzo Vallan¹, Ruben Canton-Vitoria², Habtom B Gobeze³

¹Instituto de Carboquímica , (ICB-CSIC), C/Miguel Luesma Castán 4, 50018 Zaragoza , Spain.

Journal of the American Chemical Society

|September 18, 2018

Resumen

Este estudio funcionalizó covalentemente los dicalcogenuros de metales de transición (TMD) como MoS2 y WS2 con nanodotes de carbono (CND). Los híbridos resultantes muestran potencial para la recolección de energía luminosa y la optoelectrónica debido a la transferencia controlada de electrones.

Área de la Ciencia:

Ciencias de los materiales
Nanotecnología
Optoelectrónica y sus derivados

Sus antecedentes:

Los dicalcogenuros de metales de transición (TMD) como el disulfuro de molibdeno (MoS2) y el disulfuro de tungsteno (WS2) son materiales semiconductores prometedores.
Los nanodotes de carbono (CND) ofrecen propiedades optoelectrónicas únicas y pueden ser funcionalizados para el desarrollo de materiales híbridos.

Objetivo del estudio:

Para funcionalizar covalentemente el MoS2 y el WS2 exfoliados con nanodotes de carbono modificados con 1,2-dietiolano (CND).
Investigar las propiedades optoelectrónicas y la dinámica del estado excitado de los materiales híbridos CND-MoS2 y CND-WS2 resultantes.
Explorar su potencial para la recolección de energía luminosa y aplicaciones optoelectrónicas.

Principales métodos:

Funcionalización covalente de MoS2 y WS2 con las CND.
Caracterización mediante métodos espectroscópicos (absorción, fluorescencia, absorción transitoria), térmicos y de microscopía electrónica.
Estudios electroquímicos para determinar las propiedades del donante de electrones.

Principales resultados:

Síntesis y caracterización exitosas de los híbridos CND-MoS2 y CND-WS2.
Modulación demostrada de las propiedades optoelectrónicas del TMD a través de la interfaz del CND.
Transferencia de energía ultrarrápida observada desde los CND fotoexcitados a MoS2 y WS2.
Se identificó una fácil transferencia de electrones de MoS2 a CND en híbridos CND-MoS2, pero no en CND-WS2 debido a restricciones energéticas.

Conclusiones:

El estudio destaca la importancia de los híbridos donante-aceptor derivados de TMD para la recolección de energía luminosa.
Las ideas fundamentales sobre los procesos de transferencia de electrones en estos híbridos guiarán el diseño de materiales futuros.
Estos hallazgos tienen un impacto en el desarrollo de materiales avanzados basados en TMD para una gestión eficiente de electrones.

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