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Cd₁₂Ag₃₂(SePh) ₃₆: Nanocúmulos de plata dopados con metales no nobles

Megalamane S Bootharaju^1,2, Hogeun Chang^1,2, Guocheng Deng³

¹Center for Nanoparticle Research , Institute for Basic Science (IBS) , Seoul 08826 , Republic of Korea.

Journal of the American Chemical Society

|May 16, 2019

Resumen

Los investigadores desarrollaron un nuevo método asistido por fosfina para sintetizar nanoagrupaciones de plata dopadas con cadmio (Cd₁₂Ag₃₂(SePh₃₆). Este avance permite la exploración del dopaje de metales no nobles en nanocúmulos de metales nobles, revelando una fotoluminiscencia única en el infrarrojo cercano.

Área de la Ciencia:

Nanotecnología
Ciencias de los materiales
Química

Sus antecedentes:

El dopaje de nanoagrupaciones de metales nobles con otros metales nobles está bien establecido.
La incorporación de metales no nobles como el cadmio en nanocúmulos de metales nobles presenta desafíos sintéticos significativos.

Objetivo del estudio:

Desarrollar una nueva estrategia sintética para el dopaje de metales no nobles en nanoagrupaciones de metales nobles.
Para sintetizar y caracterizar un nanocúmulo de plata dopado con cadmio con propiedades ópticas únicas.

Principales métodos:

Se empleó una estrategia sintética asistida por fosfina.
Se utilizó la difracción de un solo cristal de rayos X para la determinación estructural.
Se realizaron análisis electrónicos de la estructura y teoría funcional de la densidad (DFT).

Principales resultados:

Se sintetizó con éxito un nuevo nanocúmulo de Ag dopado con Cd, Cd₁₂Ag₃₂, SePh₃₆.
El nanocúmulo exhibe una característica de absorción de rayos UV y una rara fotoluminiscencia en el infrarrojo cercano (NIR) a ~1020 nm.
La cristalografía de rayos X reveló un núcleo asimétrico Ag₄@Ag₂₄ protegido por marcos Cd₃Ag9, identificándolo como un superátomo de 20 electrones.

Conclusiones:

El método desarrollado asistido por fosfina proporciona una nueva vía para el dopaje de metales no nobles en nanocúmulos de metales nobles.
Este enfoque facilita la investigación de cómo la incorporación de metales no nobles influye en las propiedades ópticas y químicas de los nanocúmulos.
El nanocúmulo de Cd-Ag sintetizado demuestra el potencial para aplicaciones que requieren fotoluminiscencia NIR y respuestas ópticas quirales.

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