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La resistividad inducida por la colisión atómica de los nanotubos de carbono
Hugo E Romero1, Kim Bolton, Arne Rosén
1Department of Physics, Pennsylvania State University, University Park, PA 16802, USA.
Science (New York, N.Y.)
|January 8, 2005
Resumen
Las colisiones con átomos de gas alteran significativamente el transporte de electrones en los nanotubos de carbono. Estos cambios en la resistencia y el poder térmico dependen del átomo de gas.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Física de la materia condensada Física de la materia condensada
- Nanotecnología La nanotecnología es la nanotecnología.
Sus antecedentes:
- Los nanotubos de carbono de pared única (SWCNT) exhiben propiedades eléctricas únicas.
- La comprensión de los factores que influyen en el transporte de electrones en SWCNTs es crucial para las aplicaciones del dispositivo.
Objetivo del estudio:
- Para investigar el impacto de las colisiones atómicas en el transporte de electrones en SWCNTs metálicos.
- Para identificar la relación entre las propiedades de las especies de gases en colisión y los cambios de transporte observados.
Principales métodos:
- Observación experimental de cambios en la resistencia y el poder térmico en películas delgadas SWCNT.
- Simulaciones de dinámica molecular para modelar las interacciones entre átomos de nanotubos y gases.
- Variación sistemática de las especies de gases en la colisión (He, Ar, Ne, Kr, Xe, CH4, N2).
Principales resultados:
- Se observaron cambios fuertes y sistemáticos en el transporte de electrones SWCNT tras la colisión con átomos de gas.
- Cambios en el transporte eléctrico (resistencia, potencia térmica) escalados con la raíz cúbica de la masa del gas en colisión (M(1/3)).
- Las simulaciones mostraron que la deformación del nanotubo y la transferencia de energía también seguían una dependencia de M{\displaystyle M} / 1⁄3.
Conclusiones:
- La deformación transitoria de la pared del nanotubo de carbono es una causa probable de un transporte alterado de electrones.
- Se propone un nuevo mecanismo de dispersión inducido por colisiones atómicas para explicar los fenómenos observados.
- Los hallazgos proporcionan nuevos conocimientos sobre las interacciones SWCNT-gas y su influencia en las propiedades eléctricas.
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