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Conductividad dependiente de la longitud de los cables moleculares conjugados sintetizados por la química de "clic"
1Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA.
Journal of the American Chemical Society
|June 17, 2010
Resumen
Hemos creado alambres moleculares conjugados de hasta 10 nm de largo utilizando la química del clic. Las mediciones eléctricas revelaron una transición del transporte de túneles al transporte de saltos entre 4 y 5 nm.
Área de la Ciencia:
- La electrónica molecular es la electrónica molecular.
- Ciencia de los materiales ciencia de los materiales.
- Nanotecnología La nanotecnología es la nanotecnología.
Sus antecedentes:
- Los cables moleculares conjugados son cruciales para los dispositivos electrónicos a nanoescala.
- La comprensión de los mecanismos de transporte de carga en los cables moleculares es clave para su aplicación.
Objetivo del estudio:
- Para preparar y caracterizar eléctricamente alambres de oligofenilenetriazol conjugado (OPT) de diferentes longitudes.
- Para investigar los mecanismos de transporte de carga en los cables OPT.
- Establecer la química de clic como un método eficiente para la fabricación de alambres moleculares.
Principales métodos:
- Síntesis de cables OPT utilizando la cicloadición de alquino azido catalizado por Cu (I) en sustratos de oro.
- Caracterización eléctrica utilizando mediciones de transporte de corriente continua (CC).
- Caracterización de la superficie mediante el uso de RAIRS, ellipsometría y XPS.
Principales resultados:
- Cables OPT preparados con éxito con longitudes de hasta 10 nm.
- Se observó una transición del transporte de túneles al transporte de saltos en el rango de longitud de 4-5 nm.
- Demostró la eficiencia de la cicloadición por clic paso a paso para la creación de monocapas autoensambladas de alambre molecular (SAM).
Conclusiones:
- La cicloadición por clic paso a paso es un método eficaz para fabricar cables moleculares conjugados en superficies de oro.
- La transición de transporte observada proporciona información sobre el transporte de carga en los sistemas moleculares.
- Los cables OPT son prometedores para futuras aplicaciones electrónicas y compatibles con diversas funcionalidades.
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