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Acoplamiento de plasmones en nanocúmulos de plata ensamblados con ADN

Qiong Wu¹, Chengcheng Liu¹, Cheng Cui^1,2

¹Center for Research at Bio/Nano Interface, Department of Chemistry and Department of Physiology and Functional Genomics, UF Health Cancer Center, UF Genetics Institute and McKnight Brain Institute, University of Florida, Gainesville, Florida 32611-7200, United States.

Journal of the American Chemical Society

|August 31, 2021

Resumen

Los clústeres metálicos de tamaño cuántico, como los nanoclusters de ADN-plata (ADN-AgNC), pueden exhibir acoplamiento de plasmones. Este estudio proporciona evidencia experimental para el acoplamiento plasmónico en ADN-AgNCs ensamblados, abriendo puertas para nuevos dispositivos plasmónicos.

Área de la Ciencia:

* La plasmónica y la nanofotónica
* Ciencia del punto cuántico y del nanocúmulo
* Química supramolecular y nanomateriales

Sus antecedentes:

* Los grupos de metal de tamaño cuántico apoyan teóricamente la excitación colectiva de plasmones.
* La evidencia experimental para el acoplamiento de plasmones en grupos metálicos de pocos átomos es escasa.
* Los nanocúmulos de plata con plantilla de ADN (DNA-AgNCs) ofrecen una plataforma para el ensamblaje controlado.

Objetivo del estudio:

* Para investigar el acoplamiento plasmónico en ADN-AgNCs ensamblados.
* Explorar las propiedades de absorción óptica de los AgNC de ADN en función de la distancia de ensamblaje.
* Determinar el potencial de las AgNC de ADN para aplicaciones de acoplamiento de plasmonas.

Principales métodos:

* Síntesis de nanocúmulos de Ag con plantilla de ADN (ADN-AgNC).
* Ensamblaje de ADN-AgNC a través de la hibridación de ADN para controlar las distancias entre racimos.
* Espectroscopia de absorción óptica para analizar los desplazamientos espectrales en el montaje.
* Simulaciones de la teoría funcional de la densidad dependiente del tiempo (TDDFT) para comprender los mecanismos de absorción y la mejora del campo eléctrico.

Principales resultados:

* Los picos de absorción óptica de ADN-AgNC ensamblados mostraron sensibilidad a las distancias entre grupos, característica del acoplamiento de plasmones.
* Las simulaciones TDDFT confirmaron el origen plasmónico de la absorción en ADN-AgNCs individuales debido a la distribución de carga dipolar y las transiciones múltiples.
* Los resultados experimentales y de simulación demostraron tendencias consistentes de desplazamiento de picos, lo que sugiere la presencia de acoplamiento de plasmones entre ADN-AgNC ensamblados.

Conclusiones:

* Las estructuras de tamaño cuántico, específicamente las AgNC de ADN, pueden soportar el acoplamiento de plasmones.
* Los AgNC de ADN muestran potencial como bloques de construcción para dispositivos de acoplamiento de plasmones ultrapequeños, específicos del sitio y biocompatibles.
* Los hallazgos avanzan en la comprensión de los fenómenos plasmónicos en sistemas de nanoescala y sus aplicaciones en dispositivos.

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