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Conjuntos quirales de superredes de ruedas en sustratos
Shan Zhou1,2, Jiahui Li1, Jun Lu3,4
1Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA.
Nature
|November 28, 2022
Resumen
Los investigadores crearon superredes quirales utilizando nanopartículas de oro. Estas estructuras autoensambladas exhiben una quiralidad ajustable y una fuerte actividad quiróptica, allanando el camino para nuevos recubrimientos metestructurados.
Área de la Ciencia:
- Nanotecnología
- Ciencias de los materiales
- Física de la materia condensada
Sus antecedentes:
- Las superrías quirales son deseables para materiales avanzados pero difíciles de sintetizar.
- El autoensamblaje de nanopartículas ofrece una ruta para crear estructuras complejas con propiedades únicas.
Objetivo del estudio:
- Para demostrar el autoensamblaje de superredes quirales de nanopartículas de oro tetraédricas.
- Investigar el control de la quiralidad y la actividad quiroptica en estas superretillas.
Principales métodos:
- Se utilizó la microscopía electrónica de transmisión de fase líquida para observar el ensamblaje de nanopartículas.
- Modelos computacionales empleados para comprender las interacciones entre nanopartículas (van der Waals, electrostática).
- Aplicó microscopía electrónica de campo cercano inducida por fotones y simulaciones de dominio de tiempo de diferencia finita para caracterizar la actividad quiróptica.
Principales resultados:
- Nanopartículas de oro tetraédricas autoensambladas en superredes de rueda de alfiler con conexiones de esquina a borde.
- Se logra una quiralidad sintonizable mediante la variación de las conexiones de nanopartículas.
- Se ha demostrado una fuerte actividad quiróptica en superredes de dos capas.
Conclusiones:
- Las superrejillas quirales soportadas por sustratos se pueden fabricar de manera simple y versátil.
- Estas estructuras permiten el desarrollo de recubrimientos metestructurados con propiedades ópticas, mecánicas y electrónicas únicas.
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