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Los azobenzenos como interruptores electrónicos moleculares controlados por la luz en las uniones
Jeffrey M Mativetsky1, Giuseppina Pace, Mark Elbing
1ISIS-CNRS 7006, Université Louis Pasteur, 8 allée Gaspard Monge, 67000 Strasbourg, France.
Journal of the American Chemical Society
|June 26, 2008
Resumen
La fotoisomerización de las moléculas de azobenzeno en las uniones metal-molécula-metal causó un aumento de 30 veces en la conductividad eléctrica. Este comportamiento de conmutación, observado utilizando microscopía de fuerza atómica conductora, se debe a cambios de conformación molecular.
Área de la Ciencia:
- La electrónica molecular es la electrónica molecular.
- Nanotecnología La nanotecnología es la nanotecnología.
- La fotoquímica es la fotoquímica.
Sus antecedentes:
- Las moléculas de azobenzeno exhiben fotoisomerización, un cambio reversible en la estructura molecular tras la exposición a la luz.
- Las uniones metal-molécula-metal son cruciales para los dispositivos electrónicos moleculares.
Objetivo del estudio:
- Para investigar la conmutación de conductividad en las uniones nanoscópicas utilizando moléculas basadas en azobenzeno.
- Para correlacionar la fotoisomerización con cambios en las propiedades eléctricas.
Principales métodos:
- Fabricación de uniones nanoscópicas metal-molécula-metal utilizando un microscopio de fuerza atómica conductor (C-AFM).
- Formación de monocapas autoensambladas de azobenceno apoyadas en oro.
- Caracterización eléctrica de las uniones.
Principales resultados:
- Se observó una conmutación de conductividad significativa en las uniones basadas en azobenzeno.
- Se midió un aumento de 30 veces en la conductividad atribuida a la fotoisomerización.
- Correlacionó el aumento de la conductividad con una reducción de la longitud de la barrera de túnel debido a cambios en la conformación molecular.
Conclusiones:
- La fotoisomerización de azobenzeno puede controlar eficazmente la conductividad eléctrica en las uniones nanoscópicas.
- Demostró el potencial de las moléculas de azobenzeno para interruptores moleculares y dispositivos de memoria.
- El enfoque C-AFM es adecuado para sondear las propiedades electrónicas de las uniones de una sola molécula.
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