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Síntesis y propiedades térmicas de isómeros estructurales de estado sólido: crecimiento ordenado de SnSe y MoSe2
Noel S Gunning1, Joseph Feser2, Matt Beekman3
1†Department of Chemistry and Materials Science Institute, University of Oregon, Eugene, Oregon 97403, United States.
Journal of the American Chemical Society
|June 19, 2015
Resumen
Los investigadores sintetizaron nuevos isómeros en capas de selenuro de estaño (SnSe) y diselenuro de molibdeno (MoSe2) utilizando un método de reactivo elemental modulado. Estos nuevos materiales exhiben una conductividad térmica excepcionalmente baja debido a interfaces desordenadas, lo que sugiere un potencial para aplicaciones termoeléctricas.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Física de la materia condensada Física de la materia condensada
- Nanotecnología La nanotecnología es la nanotecnología.
Sus antecedentes:
- Los materiales en capas como SnSe y MoSe2 son de interés para aplicaciones termoeléctricas.
- El control de la estructura y las interfaces en heterosestructuras en capas es crucial para afinar sus propiedades.
- Comprender los mecanismos de transporte térmico en compuestos complejos en capas es esencial para el diseño de materiales.
Objetivo del estudio:
- Para sintetizar y caracterizar una familia de isómeros estructurales basados en (SnSe) 1.05 y (MoSe2) n.
- Para investigar la influencia de la secuencia de capas y el grosor en las propiedades estructurales y térmicas de estos isómeros.
- Para determinar la conductividad térmica del plano transversal e identificar los factores que contribuyen a la resistencia térmica.
Principales métodos:
- Síntesis de seis isómeros distintos utilizando el método del reactivo elemental modulado.
- Caracterización de las propiedades estructurales mediante difracción de rayos X y microscopía electrónica.
- Medición de la conductividad térmica en el plano transversal.
Principales resultados:
- Preparación exitosa de seis isómeros estructurales únicos con distintas disposiciones de capas pero parámetros de celosía similares.
- Observación de muy baja conductividad térmica en el plano transversal (∼0.08 Wm(-1) K(-1)) a través de todos los isómeros sintetizados.
- Identificación de las interfaces de van der Waals turbostráticamente desordenadas (SnSe-MoSe2 y MoSe2-MoSe2) como la causa principal del mal transporte térmico.
Conclusiones:
- La estructura, el orden y el grosor de las capas constituyentes en los isómeros están dictados por la disposición de los precursores.
- La baja conductividad térmica se atribuye a la dispersión de la interfaz, con interfaces desordenadas que juegan un papel dominante.
- Los hallazgos proporcionan información sobre la relación entre la complejidad estructural, las propiedades interfaciales y el transporte térmico en materiales en capas.
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