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Scintilladores de nanocristales de perovskita totalmente inorgánicos

Qiushui Chen¹, Jing Wu², Xiangyu Ou^3,4

¹Department of Chemistry, National University of Singapore, Singapore, Singapore.

|August 29, 2018

Resumen

Los nuevos nanocristales de perovskita ofrecen centelleadores sintonizables y procesables en solución para la detección sensible de rayos X. Estos materiales permiten detectores flexibles con un mejor rendimiento para aplicaciones de imágenes médicas y de seguridad.

Área de la Ciencia:

Ciencias de los materiales
Nanotecnología
La fotónica

Sus antecedentes:

Creciente demanda de materiales avanzados para la detección de radiación.
Los scintilladores convencionales requieren una síntesis a alta temperatura y tienen una capacidad de sintonización radioluminiscente limitada.
Las tecnologías existentes se enfrentan a desafíos en cuanto a flexibilidad y sensibilidad para diversas aplicaciones de rayos X.

Objetivo del estudio:

Investigar todos los nanocristales de perovskita inorgánicos para la detección de rayos X.
Desarrollar centelleadores procesables en solución con espectros de emisión ajustables.
Mejorar la sensibilidad y la flexibilidad en la fabricación de detectores de rayos X.

Principales métodos:

Síntesis de cesio y nanocristales de perovskita a base de plomo.
Caracterización de las propiedades de absorción y radioluminiscencia de rayos X.
Fabricación de detectores flexibles de rayos X utilizando precursores coloidales.

Principales resultados:

Los nanocristales de perovskita demuestran una fuerte absorción de rayos X y emisión de luz visible.
La síntesis procesable en solución permite la fabricación a baja temperatura y el ajuste espectral.
Alcanzó un límite de detección de 13 nanograys por segundo, significativamente más bajo que las dosis de imágenes médicas.
Se ha demostrado la obtención de imágenes directas con cámaras digitales y la integración con cámaras de pantalla plana.

Conclusiones:

Los nanocristales de perovskita totalmente inorgánicos son materiales prometedores para los centelleadores de rayos X de próxima generación.
Su naturaleza ajustable y procesable en solución permite diseños de detectores novedosos.
Estos materiales ofrecen una mayor sensibilidad y flexibilidad para diversas aplicaciones de imágenes de rayos X.

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