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Modificación de la estructura del poli (bisdodecylquaterthiophene) para una conductividad alta y predominantemente no
Hui Li1, Mallory E DeCoster2, Robert M Ireland1
1Department of Materials Science and Engineering, Johns Hopkins University , 3400 North Charles Street, Baltimore, Maryland 21218, United States.
Journal of the American Chemical Society
|July 25, 2017
Resumen
Los nuevos polímeros de tipo p basados en poli (bisdodecilquatertiofeno) logran una alta conductividad y estabilidad. Las modificaciones mejoran la oxidabilidad, lo que lleva a registrar la conductividad no iónica en películas para aplicaciones electrónicas.
Área de la Ciencia:
- Ciencias de los materiales
- Productos electrónicos orgánicos
- Química de los polímeros
Sus antecedentes:
- Poly ((bisdodecylquaterthiophene) (PQT12) es un polímero base para la electrónica orgánica.
- La mejora de la oxidabilidad de los polímeros de tipo p es crucial para mejorar el rendimiento.
- Los polímeros conductores existentes a menudo sufren de inestabilidad o dependencia de las contribuciones de iones extrínsecos.
Objetivo del estudio:
- Sintetizar y caracterizar nuevos polímeros de tipo p con conductividad y estabilidad mejoradas.
- Investigar el efecto de las modificaciones químicas específicas en las propiedades del polímero.
- Evaluar el potencial de estos nuevos materiales en aplicaciones electrónicas.
Principales métodos:
- Síntesis de cuatro polímeros modificados de bisdodecilquatertiofeno (PQT12).
- Incorporación de átomos de azufre y/o grupos de 3,4-etilendioxí en la estructura PQT12.
- Dopaje de polímeros con NOBF4 y tetrafluorotetracianokinodimetano (F4TCNQ) y mediciones de conductividad.
- Caracterización de la estabilidad, transferencia de carga, apilamiento π-π, acoplamiento intermolecular, coeficiente de Seebeck, factor de potencia y conductividad térmica.
Principales resultados:
- PQTS12 (modificación de azufre) logró una conductividad de 350 S cm-1, la conductividad no iónica más alta reportada para soluciones de polímero dopadas.
- PDTDE12 (modificación de dióxido de etileno) mostró una conductividad de 140 S cm−1.
- Las conductividades fueron estables en el aire, superando a PEDOT:PSS en términos de estabilidad y falta de contribuciones de iones extrínsecos.
- Se identificó una transferencia de carga eficiente, un apilamiento π-π más estrecho y un fuerte acoplamiento intermolecular como factores clave para una alta conductividad.
- Se observaron aumentos de movilidad de 1-5 cm2 V−1 s−1, apoyados por estudios de transistores de efecto de campo.
- Las conductividades térmicas fueron típicas para los polímeros conductores (0,2-0,5 W m-1 K-1).
Conclusiones:
- Los polímeros de tipo p sintetizados presentan una excelente conductividad y estabilidad al aire.
- Las modificaciones químicas mejoran significativamente la oxidabilidad y las propiedades electrónicas del polímero.
- Estos materiales son prometedores para dispositivos electrónicos orgánicos avanzados, con potencial de mejora adicional a través de la mejora de la movilidad.
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