High-density vertically aligned multiwalled carbon nanotubes with tubular structures

Vijaya Kumar Kayastha; Yoke Khin Yap; Zhengwei Pan; Ilia N. Ivanov; Alex A. Puretzky; David B. Geohegan

doi:10.1063/1.1952575

High-density vertically aligned multiwalled carbon nanotubes with tubular structures

Vijaya Kumar Kayastha, Yoke Khin Yap, Zhengwei Pan, Ilia N. Ivanov, Alex A. Puretzky, David B. Geohegan

Functional Hybrid Nanomaterials

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

Ammonia (NH ₃) 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 NH ₃ gas. The growth of these VA-MWCNTs is guided by a growth model that combined the dissociative adsorption of acetylene molecules (C ₂H ₂) 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 C ₂H ₂ molecules on the iron catalyst and the subsequent diffusion and segregation rates of carbon.

Original language	English
Article number	253105
Pages (from-to)	1-3
Number of pages	3
Journal	Applied Physics Letters
Volume	86
Issue number	25
DOIs	https://doi.org/10.1063/1.1952575
State	Published - 2005

Funding

One of the authors (Y.K.Y.) acknowledges support from the Michigan Tech Research Excellence Fund, the Department of the Army (W911NF-04-1-0029, through the City College of New York), and the Center for Nanophase Materials Sciences (CNMS) at Oak Ridge National Laboratory.

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AU - Kayastha, Vijaya Kumar

AU - Yap, Yoke Khin

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AU - Ivanov, Ilia N.

AU - Puretzky, Alex A.

AU - Geohegan, David B.

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Y1 - 2005

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AB - Ammonia (NH 3) 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 NH 3 gas. The growth of these VA-MWCNTs is guided by a growth model that combined the dissociative adsorption of acetylene molecules (C 2H 2) 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 C 2H 2 molecules on the iron catalyst and the subsequent diffusion and segregation rates of carbon.

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High-density vertically aligned multiwalled carbon nanotubes with tubular structures

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