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Un interruptor electrónico a escala nanométrica que consiste en un grupo metálico y grupos direccionables por redox

D I Gittins¹, D Bethell, D J Schiffrin

¹Centre for Nanoscale Science, Department of Chemistry, University of Liverpool, UK.

|November 18, 2000

Resumen

Los investigadores utilizaron moléculas orgánicas redox-activas para vincular las nanopartículas de oro a las superficies de los electrodos. Este avance permite el control del transporte de electrones, allanando el camino para nuevos interruptores electrónicos a nanoescala.

Área de la Ciencia:

Nanotecnología La nanotecnología es la nanotecnología.
La electrónica molecular es la electrónica molecular.
Ciencia de los materiales Ciencia de los materiales.

Sus antecedentes:

Los métodos de fabricación de abajo hacia arriba tienen como objetivo crear dispositivos electrónicos a escala molecular, pero el control del transporte de electrones es un desafío clave.
Las moléculas orgánicas con centros redox son prometedoras para el túnel de resonancia, pero son difíciles de integrar en ensamblajes complejos.
Las nanopartículas metálicas funcionalizadas ofrecen características de un solo electrón y capacidades de autoensamblaje, lo que atrae el interés de la electrónica a nanoescala.

Objetivo del estudio:

Investigar el uso de moléculas orgánicas redox-activas para la fijación de nanopartículas metálicas a las superficies de los electrodos.
Para demostrar el control sobre el transporte de electrones entre las nanopartículas metálicas utilizando estos enlaces moleculares.
Explorar el potencial de este sistema para el desarrollo de interruptores electrónicos a nanoescala.

Principales métodos:

Utilizó microscopía de túnel de barrido (STM) para medir el transporte de electrones.
Empleó nanoclusters de oro funcionalizados con cadenas de polimetileno y una fracción central de bipyridinium.
Investigó el contacto electrónico y las propiedades de túnel entre nanopartículas y electrodos a través de moléculas redox activas.

Principales resultados:

Con éxito se adjuntaron nanocúmulos de oro a las superficies de los electrodos utilizando moléculas orgánicas funcionalizadas.
Demostró que las moléculas redox-activas pueden controlar el transporte de electrones entre las nanopartículas.
Se observó que la inyección de carga en las moléculas altera profundamente las propiedades de túnel.

Conclusiones:

Las moléculas orgánicas redox activas pueden efectivamente unir las nanopartículas metálicas a las superficies de los electrodos.
Este puente molecular permite el transporte controlado de electrones, un factor crítico en la funcionalidad de los dispositivos a nanoescala.
El sistema desarrollado proporciona una base para la creación de avanzados interruptores electrónicos a nanoescala mediante la manipulación de los estados de carga molecular.

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