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Polímero de coordinación neutral altamente conductor con redes infinitas bidimensionales de plata y azufre
Xing Huang1,2, Haisheng Li3, Zeyi Tu1,2
1Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , China.
Journal of the American Chemical Society
|September 13, 2018
Resumen
Los investigadores crearon películas de polímero de coordinación basadas en plata altamente cristalina (Ag-BHT). Estas películas exhiben una alta conductividad eléctrica debido a sus redes bidimensionales únicas de plata y azufre y su banda de valencia parcialmente llena.
Área de la Ciencia:
- Ciencias de los materiales
- Química del estado sólido
- Nanotecnología
Sus antecedentes:
- Los polímeros de coordinación ofrecen propiedades electrónicas sintonizables.
- Los materiales a base de plata se exploran para aplicaciones conductoras.
- El Benzenehexatiol (BHT) es un ligando versátil para crear redes extendidas.
Objetivo del estudio:
- Para sintetizar y caracterizar las películas altamente cristalinas de un nuevo polímero de coordinación a base de plata, [Ag5(C6S6) ]n (Ag-BHT).
- Aclarar las relaciones estructura-propiedad que rigen la conductividad eléctrica de las películas Ag-BHT.
- Investigar los orígenes electrónicos de la conductividad observada.
Principales métodos:
- Preparación de películas Ag-BHT de alta cristalinidad.
- Determinación de la estructura mediante difracción de electrones de rotación y difracción de rayos X en polvo.
- Mediciones de la conductividad eléctrica a 300 K.
- Caracterización electrónica mediante espectroscopia ultravioleta de fotoelectrones (UPS) y cálculos de la estructura de la banda electrónica.
Principales resultados:
- Se han sintetizado con éxito películas de Ag-BHT altamente cristalinas con una estructura lamelar.
- La estructura se caracteriza por la alternancia de redes bidimensionales de Ag-S y capas unidimensionales de polímero metálico-diotioleno.
- Se consigue una alta conductividad eléctrica de hasta 250 S·cm-1 a 300 K.
- UPS y los cálculos confirmaron una banda de valencia parcialmente llena que contribuye a la conductividad.
Conclusiones:
- Las redes bidimensionales únicas de Ag-S son cruciales para la alta conductividad eléctrica de Ag-BHT.
- La banda de valencia parcialmente llena es una característica electrónica clave que permite el transporte eficiente de cargas.
- El Ag-BHT representa un material prometedor para aplicaciones electrónicas avanzadas.
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