Heteronorodos coloidales de punto en rojo emisores de CuInS2/ZnS por crecimiento de semilla
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Chenghui Xia1,2, Naomi Winckelmans3, P Tim Prins1
1Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science , Utrecht University , P.O. Box 80000 , 3508 TA Utrecht , The Netherlands.
Journal of the American Chemical Society
|March 24, 2018
Resumen
Los investigadores desarrollaron un nuevo método de síntesis para los heteronanocristales anisotrópicos de sulfuro de cobre e indio y sulfuro de zinc. Este método permite el crecimiento controlado de estos nanomateriales para aplicaciones de fotoluminiscencia en el infrarrojo cercano.
Área de la Ciencia:
- Ciencias de los materiales
- Nanotecnología
- Química inorgánica
Sus antecedentes:
- La síntesis de heteronanocristales anisotrópicos (HNC) basados en CuInX2 es un desafío debido a la reactividad del precursor y la difusión del catión.
- Los métodos existentes luchan por controlar el crecimiento de nanoestructuras complejas.
Objetivo del estudio:
- Desarrollar un protocolo de crecimiento de semillas en varios pasos para las HNC anisotrópicas CuInS2/ZnS de núcleo punteado/barras.
- Para lograr la fotoluminiscencia NIR alrededor de 800 nm.
Principales métodos:
- Intercambio catiónico topotáctico para crear semillas CuInS2 a partir de Cu2-xS NC.
- Crecimiento de semillas mediante inyección secuencial de precursores (azufre, luego semillas de CuInS2) en una solución caliente.
- Crecimiento heteroepitaxial controlado de ZnS en facetas específicas de semillas de CuInS2.
Principales resultados:
- Se han sintetizado con éxito los HNC de wurtzita CuInS2/ZnS con fotoluminiscencia NIR (~800 nm).
- Se ha logrado un crecimiento anisotrópico de nanorodos de ZnS en semillas de CuInS2, conservando la polaridad cristalina.
- Se identificó el momento óptimo de inyección de precursores para maximizar el crecimiento anisotrópico y minimizar las reacciones secundarias.
Conclusiones:
- Un nuevo protocolo de crecimiento de semillas en varios pasos permite la síntesis controlada de CuInS2/ZnS HNC anisotrópicos.
- El método desarrollado ofrece nuevas vías para el diseño de nanomateriales multifuncionales a base de calogenuro de cobre.
- Las ideas sobre los mecanismos de crecimiento facilitan el diseño futuro de nanocristales heteronáuticos avanzados.
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