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Películas orientadas de marco orgánico covalente bidimensional para aplicaciones electrocrómicas en el infrarrojo
Qing Hao1, Zhi-Juan Li1, Cheng Lu1
1University of the Chinese Academy of Sciences , Beijing 100049 , P. R. China.
Journal of the American Chemical Society
|November 21, 2019
Resumen
Este estudio informa sobre una película de marco orgánico covalente bidimensional (2D COF) basada en trifenilamina que exhibe cambios de color reversibles para dispositivos electrocrómicos. El material muestra potencial para aplicaciones en las regiones visible e infrarroja cercana.
Área de la Ciencia:
- Ciencias de los materiales
- La electroquímica
- Nanotecnología
Sus antecedentes:
- Los materiales a base de trifenilamina se exploran por sus propiedades electrónicas.
- Los marcos orgánicos covalentes bidimensionales (2D COF) ofrecen estructuras ajustables para aplicaciones avanzadas.
- Los materiales electrocrómicos cambian de color con la estimulación eléctrica, lo que permite tecnologías inteligentes de ventanas y pantallas.
Objetivo del estudio:
- Investigar las propiedades electrocrómicas de una nueva película de COF 2D a base de trifenilamina.
- Construir y evaluar un dispositivo electrocrómico en estado casi sólido utilizando la película COF 2D.
- Para caracterizar la estructura de la película, la cristalinidad y la orientación en un sustrato de óxido de indio-lata (ITO).
Principales métodos:
- Fabricación de una película COF en 2D (COF3PA-TT) sobre vidrio recubierto con ITO.
- Caracterización de la película utilizando técnicas para evaluar su uniformidad, cristalinidad y orientación.
- Mediciones electroquímicas y espectroelectroquímicas para estudiar el comportamiento electrocrómico.
- Montaje de un dispositivo electrocrómico de estado casi sólido.
Principales resultados:
- La película COF3PA-TT demostró una estructura uniforme y cristalina, orientada paralela al sustrato.
- Se observaron transiciones de color reversibles entre rojo intenso y marrón oscuro durante los procesos redox.
- El análisis espectroelectroquímico reveló cambios de color en las regiones visibles e infrarrojas cercanas, indicativos de la transferencia de carga de intervalencia.
- El dispositivo fabricado mostró un rendimiento y una estabilidad moderados, particularmente en el espectro del infrarrojo cercano.
Conclusiones:
- La película de COF 2D a base de trifenilamina muestra propiedades electrocrómicas prometedoras.
- El material es adecuado para su integración en dispositivos electrocrómicos, con potencial para aplicaciones en el infrarrojo cercano.
- La investigación adicional puede optimizar el rendimiento del dispositivo y explorar aplicaciones más amplias de estas películas de COF orientadas en 2D.
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