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Control multicanal de la multiferroicidad en cristales orgánicos homoquirales de un solo componente
Wei-Qiang Liao1, Yu-Ling Zeng1, Yuan-Yuan Tang1
1Ordered Matter Science Research Center, Nanchang University, Nanchang 330031, People's Republic of China.
Journal of the American Chemical Society
|December 20, 2021
Resumen
Los investigadores desarrollaron nuevos multiferroicos fotocrómicos orgánicos que pueden controlarse ópticamente. Estos materiales exhiben propiedades ferroeléctricas y ferroelásticas intercambiables, que ofrecen potencial para aplicaciones electrónicas avanzadas.
Área de la Ciencia:
- Ciencias de los materiales
- Química orgánica
- Física del estado sólido
Sus antecedentes:
- Los materiales ferroeléctricos / ferroelásticos exhiben polarización / deformación conmutable a través de campos eléctricos / tensiones mecánicas.
- El control óptico de estas propiedades en materiales cristalinos está poco explorado, a pesar de las ventajas de la fotoirradicación.
Objetivo del estudio:
- Introducir nuevos multiferoicos fotocrómicos homoquiral de un solo componente.
- Para demostrar la conmutación óptica de las propiedades ferroeléctricas/ferroelásticas en estos cristales orgánicos.
Principales métodos:
- Síntesis de (R) - y (S) -N-3,5-di-tert-butilsalicileno-1-4-bromofeniletilamina (SA-Ph-Br) y (SA-Ph-Br)
- Investigación de las transiciones de fase ferroeléctrica/ferroelástica a 336 K.
- Experimentos de fotorradiación para inducir y revertir las fotoisomerizaciones estructurales (formas enol y trans-ceto).
- Medición de la impedancia acústica.
Principales resultados:
- Se sintetizaron dos nuevos multiferoicos fotocrómicos homoquirales de un solo componente orgánico.
- La fotoirradicación cambió de forma reversible la polarización/deformación espontánea en cuestión de segundos a través de la fotoisomerización estructural.
- Los materiales exhiben una impedancia acústica ultra baja (~ 2,42 × 10^6 kg·s^-1·m^-2), más baja que el PVDF.
- Se logró el control simultáneo de múltiples órdenes ferrónicas por campos eléctricos, de tensión y de luz.
Conclusiones:
- Este trabajo demuestra el control óptico de las propiedades ferroeléctricas/ferroelásticas en cristales orgánicos de un solo componente.
- Los materiales poseen un comportamiento multiferroico ajustable y una baja impedancia acústica, adecuados para aplicaciones biointegradas.
- Las aplicaciones potenciales incluyen el almacenamiento de datos multicanal y la optoelectrónica compatible con la electrónica totalmente orgánica y los tejidos humanos.
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