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Transformaciones inteligentes reversibles entre superestructuras quirales de grupos de cobre para conmutación óptica
Zhen Han1, Yubing Si1, Xi-Yan Dong1,2
1Henan Key Laboratory of Crystalline Molecular Functional Materials, and College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
Journal of the American Chemical Society
|March 13, 2023
Resumen
Los investigadores desarrollaron supercristales quirales a partir de grupos de cobre, logrando cambios significativos en las propiedades ópticas y la emisión de infrarrojos cercanos para imágenes de visión nocturna. Estos materiales exhiben transformaciones que responden a estímulos y potencial para dispositivos ópticos avanzados.
Área de la Ciencia:
- Ciencias de los materiales
- Nanotecnología
- Optoelectrónica y sus derivados
Sus antecedentes:
- Las superestructuras quirales son cruciales para aplicaciones avanzadas, pero siguen siendo difíciles de crear.
- El acoplamiento intercluster limitado a temperatura ambiente restringe el control de las propiedades colectivas.
Objetivo del estudio:
- Para sintetizar y caracterizar nuevos supercristales quirales a partir de grupos monoméricos de cobre.
- Para investigar las propiedades ópticas colectivas y el comportamiento de respuesta a estímulos de estos supercristales.
Principales métodos:
- Síntesis de grupos quirales monoméricos de cobre y su ensamblaje en supercristales.
- Difracción de rayos X monocristalino in situ (SCXRD) y espectroscopia óptica (en estado estacionario y con resolución en el tiempo).
- Experimentos de respuesta y cálculos teóricos para comprender las interacciones intercluster.
Principales resultados:
- Se logró un desplazamiento al rojo en el borde de la banda de absorción de más de 1,3 eV.
- Fotoluminiscencia observada y fosforescencia polarizada circularmente desde las regiones visibles hasta el infrarrojo cercano (NIR) (572858 nm).
- Se ha demostrado un alto rendimiento cuántico NIR (hasta el 45%) a temperatura ambiente y transformaciones supercristalinas sensibles a estímulos con conmutación óptica.
Conclusiones:
- Los supercristales quirales de los grupos de metales a nanoescala exhiben respuestas quirópticas colectivas únicas.
- Las interacciones orbitales intercluster sensibles a la distancia son clave para estas propiedades ópticas.
- Aplicaciones potenciales en imágenes de visión nocturna, almacenamiento de información y dispositivos ópticos NIR.
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