High-density vertically aligned multiwalled carbon nanotubes with tubular structures | Zendy

Vijaya Kayastha | Zendy; Yoke Khin Yap | Zendy; Zhengwei Pan | Zendy; Ilia N. Ivanov | Zendy; Alexander A. Puretzky | Zendy; David B. Geohegan | Zendy

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High-density vertically aligned multiwalled carbon nanotubes with tubular structures

Author(s) -

Vijaya Kayastha,

Yoke Khin Yap,

Zhengwei Pan,

Ilia N. Ivanov,

Alexander A. Puretzky,

David B. Geohegan

Publication year - 2005

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.1952575

Subject(s) - acetylene , materials science , carbon nanotube , chemical engineering , adsorption , molecule , carbon fibers , diffusion , decomposition , nanotechnology , catalysis , ammonia , chemistry , organic chemistry , composite material , composite number , physics , engineering , thermodynamics

Ammonia (NH3) gas was thought to be essential for the growth of vertically aligned multiwalled carbon nanotubes (VA-MWCNTs) and led to the formation of bamboo-like structures. Here, we show that VA-MWCNTs with ideal tubular structures can be grown on substrates by various mixed gases with or without NH3 gas. The growth of these VA-MWCNTs is guided by a growth model that combined the dissociative adsorption of acetylene molecules (C2H2) and the successive vapor-liquid-solid growth mechanism. Results indicate that the key factor for growing these VA-MWCNTs is a balance between the decomposition rate of the C2H2 molecules on the iron catalyst and the subsequent diffusion and segregation rates of carbon.

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