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Kirigami químicamente derivado de WSe2
Liang Cai1,2, Melinda J Shearer1, Yuzhou Zhao1
1Department of Chemistry , University of Wisconsin-Madison , Madison , Wisconsin 53706 , United States.
Journal of the American Chemical Society
|August 8, 2018
Resumen
Los investigadores crearon nuevas estructuras de kirigami WSe2 utilizando deposición de vapor químico y grabado. Este método revela arquitecturas multicapa únicas y proporciona información sobre las propiedades de los materiales en 2D.
Área de la Ciencia:
- Ciencias de los materiales
- Física de la materia condensada
- Nanotecnología
Sus antecedentes:
- Los dicalcogenuros metálicos en capas exhiben fenómenos físicos únicos influenciados por su apilamiento y arquitectura.
- Comprender estos fenómenos requiere un control preciso de la estructura del material a escala microscópica.
Objetivo del estudio:
- Informar sobre las nuevas estructuras de kirigami a microescala del deselenido de tungsteno multicapa (WSe2).
- Investigar el mecanismo de formación y las características estructurales de estos kirigami.
- Explorar el potencial de este método para el estudio de las propiedades de los materiales en 2D.
Principales métodos:
- Fabricación de WSe2 kirigami mediante deposición de vapor químico y grabado.
- Caracterización mediante microscopía electrónica de barrido (SEM) y microscopía de fuerza atómica (AFM).
- Análisis de la estructura-simetría y el apilamiento de capas utilizando imágenes de generación de segunda armonía (SHG) y espectroscopia micro-Raman.
Principales resultados:
- Creación exitosa de intrincados kirigamis multicapa WSe2 con características como bordes cóncavos curvos, asas y esquinas de dientes de sierra.
- Elucidación de la relación estructura-simetría y apilamientos de capas a través de imágenes y espectroscopia avanzadas.
- Propuesta de un modelo de grabado en el que el apilamiento de tres capas inferiores rige el comportamiento de grabado multicapa WSe2.
Conclusiones:
- El enfoque de grabado químico desarrollado permite la formación de complejas estructuras de kirigami WSe2.
- El modelo de grabado propuesto explica con precisión el proceso de formación de kirigami.
- Este método es aplicable a otros dicalcogenuros metálicos, ofreciendo nuevas plataformas para la investigación de materiales en 2D.
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