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Title: Molecular Beam-Controlled Nucleation and Growth of Vertically Aligned Single-Wall Carbon Nanotube Arrays

Abstract

The main obstacle to widespread application of single-wall carbon nanotubes is the lack of reproducible synthesis methods of pure material. We describe a new growth method for single-wall carbon nanotubes that uses molecular beams of precursor gases that impinge on a heated substrate coated with a catalyst thin film. In this growth environment the gas and the substrate temperature are decoupled and carbon nanotube growth occurs by surface reactions without contribution from homogeneous gas-phase reactions. This controlled reaction environment revealed that SWCNT growth is a complex multicomponent reaction in which not just C, but also H, and O play a critical role. These experiments identified acetylene as a prolific direct building block for carbon network formation that is an order of magnitude more efficient than other small-molecule precursors. The molecular jet experiments show that with optimal catalyst particle size the incidence rate of acetylene molecules plays a critical role in the formation of single-wall carbon nanotubes and dense vertically aligned arrays in which they are the dominant component. The threshold for vertically aligned growth, the growth rate, the diameter, and the number of walls of the carbon nanotubes are systematically correlated with the acetylene incidence rate and the substrate temperature.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1003574
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Journal of Physical Chemistry B
Additional Journal Information:
Journal Volume: 109; Journal Issue: 35; Journal ID: ISSN 1520--6106
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ACETYLENE; CARBON; CATALYSTS; GASES; MOLECULAR BEAMS; NANOTUBES; NUCLEATION; PARTICLE SIZE; PRECURSOR; SUBSTRATES; SYNTHESIS; THIN FILMS

Citation Formats

Eres, Gyula, Kinkhabwala, Anika A, Cui, Hongtao, Geohegan, David B, Puretzky, Alexander A, and Lowndes, Douglas H. Molecular Beam-Controlled Nucleation and Growth of Vertically Aligned Single-Wall Carbon Nanotube Arrays. United States: N. p., 2005. Web. doi:10.1021/jp051531i.
Eres, Gyula, Kinkhabwala, Anika A, Cui, Hongtao, Geohegan, David B, Puretzky, Alexander A, & Lowndes, Douglas H. Molecular Beam-Controlled Nucleation and Growth of Vertically Aligned Single-Wall Carbon Nanotube Arrays. United States. doi:10.1021/jp051531i.
Eres, Gyula, Kinkhabwala, Anika A, Cui, Hongtao, Geohegan, David B, Puretzky, Alexander A, and Lowndes, Douglas H. Sat . "Molecular Beam-Controlled Nucleation and Growth of Vertically Aligned Single-Wall Carbon Nanotube Arrays". United States. doi:10.1021/jp051531i.
@article{osti_1003574,
title = {Molecular Beam-Controlled Nucleation and Growth of Vertically Aligned Single-Wall Carbon Nanotube Arrays},
author = {Eres, Gyula and Kinkhabwala, Anika A and Cui, Hongtao and Geohegan, David B and Puretzky, Alexander A and Lowndes, Douglas H},
abstractNote = {The main obstacle to widespread application of single-wall carbon nanotubes is the lack of reproducible synthesis methods of pure material. We describe a new growth method for single-wall carbon nanotubes that uses molecular beams of precursor gases that impinge on a heated substrate coated with a catalyst thin film. In this growth environment the gas and the substrate temperature are decoupled and carbon nanotube growth occurs by surface reactions without contribution from homogeneous gas-phase reactions. This controlled reaction environment revealed that SWCNT growth is a complex multicomponent reaction in which not just C, but also H, and O play a critical role. These experiments identified acetylene as a prolific direct building block for carbon network formation that is an order of magnitude more efficient than other small-molecule precursors. The molecular jet experiments show that with optimal catalyst particle size the incidence rate of acetylene molecules plays a critical role in the formation of single-wall carbon nanotubes and dense vertically aligned arrays in which they are the dominant component. The threshold for vertically aligned growth, the growth rate, the diameter, and the number of walls of the carbon nanotubes are systematically correlated with the acetylene incidence rate and the substrate temperature.},
doi = {10.1021/jp051531i},
journal = {Journal of Physical Chemistry B},
issn = {1520--6106},
number = 35,
volume = 109,
place = {United States},
year = {2005},
month = {1}
}