Pulsed growth of vertically aligned nanotube arrays with variable density.
ACS Nano
; 4(12): 7573-81, 2010 Dec 28.
Article
en En
| MEDLINE
| ID: mdl-21128670
ABSTRACT
The density of vertically aligned carbon nanotube arrays is shown to vary significantly during normal growth by chemical vapor deposition and respond rapidly to changes in feedstock flux. Pulsing the feedstock gas to repeatedly stop and start nanotube growth is shown to induce density variations up to a factor of 1.6 within ca. 1-2 µm long layers, allowing the synthesis of new array architectures with distinct regions of controllable length and density variation. Z-Contrast scanning transmission electron microscopy of corresponding sections of the arrays is used to provide unambiguous measurements of these density variations. Time-resolved optical reflectivity measurements of the height and optical extinction coefficient of the growing arrays are shown to provide a real-time diagnostic of both array density and growth kinetics.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Nanotecnología
/
Nanotubos
Idioma:
En
Revista:
ACS Nano
Año:
2010
Tipo del documento:
Article
País de afiliación:
Estados Unidos