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Propiedades electrónicas de las redes de nanotubos de carbono de pared única
Elena Bekyarova1, Mikhail E Itkis, Nelson Cabrera
1Center for Nanoscale Science and Engineering, University of California, Riverside, California 92521, USA.
Journal of the American Chemical Society
|April 21, 2005
Resumen
La funcionalización química de los nanotubos de carbono de pared única (SWNT) altera significativamente sus propiedades electrónicas. La modificación de los SWNT afecta la conductividad, crucial para el desarrollo de sensores avanzados basados en SWNT.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Nanotecnología La nanotecnología es la nanotecnología.
- Física de la materia condensada Física de la materia condensada
Sus antecedentes:
- Los nanotubos de carbono de pared única (SWNT) exhiben propiedades electrónicas únicas.
- Comprender el comportamiento de SWNT es clave para las aplicaciones de sensores.
- La conductividad de la película está influenciada por la pureza y el procesamiento de los nanotubos.
Objetivo del estudio:
- Para investigar las propiedades electrónicas de las películas SWNT.
- Para demostrar el efecto de la funcionalización química en la conductividad de SWNT.
- Para aclarar el mecanismo de los sensores basados en SWNT.
Principales métodos:
- Preparación de películas de SWNT mediante deposición por pulverización.
- Medición del grosor efectivo de la película mediante espectroscopia óptica.
- Caracterización de la conductividad eléctrica a temperatura ambiente y su dependencia de la temperatura.
Principales resultados:
- Las películas de SWNT preparadas y purificadas muestran conductividades de 250-400 S/cm.
- La dependencia de la temperatura no metálica indica que las barreras de túnel dominan la conductividad.
- La funcionalización química con ODA y PABS reduce drásticamente la conductividad a 3 S/cm y 0.3 S/cm, respectivamente.
Conclusiones:
- La funcionalización química modifica críticamente las propiedades electrónicas de SWNT.
- Las barreras de los túneles tienen un impacto significativo en la conductividad de las películas SWNT.
- Los efectos de funcionalización proporcionan información sobre los mecanismos de los sensores SWNT.
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