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Electrónica de proteínas: Modulación química de los contactos de control Alineación del nivel de energía en las
Journal of the American Chemical Society
|September 21, 2018
Resumen
El acoplamiento proteico-electródico modificado químicamente controla el transporte de electrones en las uniones biomoleculares. Este método sintoniza los mecanismos de transporte entre el túnel de resonancia y fuera de resonancia sin puertas externas, lo que permite un control preciso en los dispositivos electrónicos.
Área de la Ciencia:
- Electrónica biomolecular
- El autoensamblaje molecular
- Transporte de carga
Sus antecedentes:
- El control del transporte de carga a través de las biomoléculas es crucial para la electrónica biomolecular.
- Las uniones de estado sólido ofrecen una plataforma para estudiar el transporte de electrones (ETp) en las biomoléculas.
Objetivo del estudio:
- Demostrar la modulación química del acoplamiento electrodo-molécula para el control de ETp en las uniones biomoleculares.
- Investigar el cambio entre mecanismos de túnel resonantes y no resonantes a través de la modificación química.
Principales métodos:
- Utilizó la proteína azurina (Az) en las uniones de electrodos de oro preparadas litográficamente.
- Electrodos de oro funcionalizados covalentemente con Az a través de enlaces Au-S y moléculas de enlace.
- Acoplamiento modificado de la proteína de enlace a través de la formación de enlaces amídicos para alterar los mecanismos de ETp.
Principales resultados:
- Se logró el control de ETp mediante la modulación química del acoplamiento entre electrodos y azurina.
- Demostró un cambio en el mecanismo de ETp de tunelamiento resonante a fuera de resonancia al alterar el enlace de amida.
- Energías orbitales de la frontera azurina determinadas para diferentes configuraciones de acoplamiento electrodo-proteína.
Conclusiones:
- La modificación química del acoplamiento electrodo-molécula proporciona un método para controlar ETp en las uniones biomoleculares.
- Este enfoque permite propiedades electrónicas sintonizables en dispositivos de dos terminales sin electrodos de puerta.
- Abre vías para el control cualitativo y cuantitativo en dispositivos electrónicos biomoleculares.
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