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Electrodeposición epitaxial de las superficies metálicas quirales sobre el silicio

Meagan V Kelso¹, John Z Tubbesing², Qingzhi Chen²

¹Department of Materials Science and Engineering and Graduate Center for Materials Research , Missouri University of Science and Technology , Rolla , Missouri 65409-1170 , United States.

Journal of the American Chemical Society

|October 27, 2018

Resumen

Los investigadores crearon superficies quirales para la catálisis y la separación mediante el depósito electroquímico de oro en obleas de silicio. Este método produce superficies enantioméricas, lo que permite la oxidación selectiva de los enantiómeros de glucosa, y evita el uso de costosos cristales individuales.

Área de la Ciencia:

Ciencias de la superficie
Química de los materiales
Catálisis

Sus antecedentes:

Las superficies achirales pueden exhibir quiralidad bidimensional si carecen de simetría especular, como la superficie (643) de metales cúbicos centrados en la cara.
Las superficies quirales son prometedoras para aplicaciones en síntesis asimétrica, separación quiral y cristalización.
Los métodos anteriores para crear superficies quirales a menudo requerían costosos cristales individuales.

Objetivo del estudio:

Para aclarar los requisitos de simetría para crear superficies quirales.
Desarrollar un método para producir superficies quirales enantioméricas utilizando electrodeposición.
Para demostrar la utilidad de estas superficies quirales en procesos químicos selectivos.

Principales métodos:

Deposición electroquímica de películas de oro epitaxial en obleas de silicio (Si) disponibles en el mercado con orientación (643).
Deposición controlada para crear superficies enantioméricas Au ((643) y Au ((6̅4̅3̅) en lados opuestos de la oblea.
Posterior electrodeposición de otros metales (Pt, Ni, Cu, Ag) en las películas de oro para crear estructuras ordenadas de múltiples capas.

Principales resultados:

Se han producido con éxito superficies de oro enantiomérico, Au ((643) y Au ((6̅4̅3̅), en obleas de Si ((643).
Se observó una orientación adicional de Au{8 14 17) con torceduras escalonadas, que también exhiben quiralidad superficial.
Demostró que otros metales depositados en estas películas de oro exhiben un alto orden estructural.
Se ha demostrado la oxidación electroquímica enantioselectiva de d-glucosa y l-glucosa en las superficies Ag/Au/Si ((643) y Ag/Au/Si ((6̅4̅3̅) respectivamente.

Conclusiones:

El método de deposición electroquímica proporciona una vía escalable para fabricar diversas superficies quirales sin costosos cristales individuales.
Las superficies quirales producidas pueden actuar como plataformas para reacciones químicas enantioselectivas, como la oxidación de la glucosa.
Este enfoque abre caminos para el desarrollo de nuevos catalizadores quirales y materiales de separación.

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