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Puntos cuánticos de la cáscara del núcleo CdSe/AsS: preparación y fluorescencia de dos fotones.

Junzhong Wang¹, Ming Lin, Yongli Yan

¹Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore.

Journal of the American Chemical Society

|July 25, 2009

Resumen

Los investigadores desarrollaron nanocristales de núcleo de cáscara de selenuro de cadmio (CdSe) recubiertos con sulfuro de arsénico (AsS). Estos nuevos nanocristales muestran una fluorescencia mejorada y pueden usarse para el etiquetado celular.

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Área de la Ciencia:

Nanotecnología La nanotecnología es la nanotecnología.
Ciencia de los materiales Ciencia de los materiales.
La biofotónica es la biofotónica.

Sus antecedentes:

Los nanocristales de selenuro de cadmio (CdSe) son ampliamente estudiados por sus propiedades ópticas.
El desarrollo de estructuras de núcleo-caparazón puede mejorar el rendimiento del nanocristal e introducir nuevas funcionalidades.
El sulfuro de arsénico (AsS) es un material con aplicaciones potenciales en optoelectrónica.

Objetivo del estudio:

Para sintetizar nanocristales de núcleo de CdSe recubiertos con sulfuro de arsénico (AsS). nanocristales de núcleo de CdSe recubiertos con sulfuro de arsénico (AsS). para sintetizar nanocristales de núcleo de CdSe recubiertos con sulfuro de arsénico (AsS).
Para investigar las propiedades ópticas de las nuevas estructuras núcleo-capa.
Para explorar la aplicación de estos nanocristales en el etiquetado celular.

Principales métodos:

Enfoque de deposición de complejo de racimo en condiciones suaves.
Crecimiento de la cáscara de AsS sobre los nanocristales de CdSe a 60°C.
Utilizando un disolvente mezclado de isopropanol/cloroformo para la cristalización.

Principales resultados:

Se prepararon con éxito nanocristales de capa de núcleo de CdSe recubiertos con AsS.
Se observó una fluorescencia de un fotón significativamente mejorada.
Se demostró una fluorescencia mejorada de dos fotones de conversión hacia arriba. fluorescencia.
Se ha confirmado la estructura de núcleo de tipo I.

Conclusiones:

El método de deposición de complejo de racimo proporciona una ruta viable para la creación de nanocristales de núcleo de cáscara de AsS/CdSe.
Estos nuevos nanocristales exhiben propiedades de fluorescencia superiores en comparación con el CdSe.
Los nanocristales AsS / CdSe son adecuados para aplicaciones de etiquetado celular de conversión ascendente excitada por infrarrojos.