期刊
APPLIED PHYSICS LETTERS
卷 99, 期 14, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3645625
关键词
atomic force microscopy; carbon nanotubes; catalysts; nanofabrication; numerical analysis; Raman spectra; scanning electron microscopy; surface diffusion; transmission electron microscopy
资金
- CSIRO
- CSIROs Sensors and Sensor Networks TCP
- Australian Research Council
Effective control of dense, high-quality carbon nanotube arrays using hierarchical multilayer catalyst patterns is demonstrated. Scanning/transmission electron microscopy, atomic force microscopy, Raman spectroscopy, and numerical simulations show that by changing the secondary and tertiary layers one can control the properties of the nanotube arrays. The arrays with the highest surface density of vertically aligned nanotubes are produced using a hierarchical stack of iron nanoparticles and alumina and silica layers differing in thickness by one order of magnitude from one another. The results are explained in terms of the catalyst structure effect on carbon diffusivity. (C) 2011 American Institute of Physics. [doi:10.1063/1.3645625]
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