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Phonon hidrodinámica y conductividad térmica a temperatura ambiente ultra-alta en el grafito delgado
Yo Machida1, Nayuta Matsumoto2, Takayuki Isono2
1Department of Physics, Gakushuin University, Tokyo 171-8588, Japan. yo.machida@gakushuin.ac.jp kamran.behnia@espci.fr.
Science (New York, N.Y.)
|January 18, 2020
Resumen
Este estudio revela que el grafito delgado exhibe una conductividad térmica excepcional, superando al diamante y al grafeno. Este alto rendimiento está relacionado con la hidrodinámica de fonones, el grosor y la temperatura.
Área de la Ciencia:
- Ciencias de los materiales
- Física de la materia condensada
Sus antecedentes:
- Los alotrópicos de carbono como el diamante y el grafeno son conocidos por su conductividad térmica superior.
- La comprensión del transporte térmico en el grafito es crucial para las aplicaciones de materiales avanzados.
Objetivo del estudio:
- Investigar la dependencia de la temperatura y el espesor de la conductividad térmica en el grafito fino.
- Para explorar la relación entre la conductividad térmica, la hidrodinámica de fonones y el grosor del material.
Principales métodos:
- Monitoreo de la evolución de la conductividad térmica en muestras finas de grafito.
- Temperatura variable y espesor de la muestra durante las mediciones.
Principales resultados:
- La conductividad térmica en el plano a temperatura ambiente del grafito de 8,5 micrómetros de espesor alcanzó los 4300 W/m·K, superando al diamante y al grafeno purificado.
- La difusividad térmica aumentó con el calentamiento, lo que indica un flujo de fonones parcialmente hidrodinámico.
- La disminución del grosor mejoró la conductividad térmica, correlacionándose con el momento del fonón y las colisiones.
Conclusiones:
- La conductividad térmica del grafito está íntimamente relacionada con la hidrodinámica de los fonones, el grosor y la temperatura.
- La dispersión anisotrópica de fonones en el grafito juega un papel clave en sus propiedades de transporte térmico.
- El grafito delgado demuestra una notable conductividad térmica, ofreciendo potencial para soluciones de gestión térmica.
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