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Multiple Alkynes React with Ethylene To Enhance Carbon Nanotube Synthesis, Suggesting a Polymerization-like Formation Mechanism

Thermal treatments of feedstock gases (e.g., C2H4/H2) used during carbon nanotube (CNT) synthesis result in the formation of a complex mixture of volatile organic compounds and polycyclic aromatic hydrocarbons. Some of these are likely important CNT precursors, while others are superfluous and possibly degrade product quality, form amorphous carbon, and/or contribute to growth termination. To simulate the effect of thermal treatment without this chemical complexity, we delivered trace amounts of individual hydrocarbons, along with ethylene and hydrogen, to a cold-wall atmospheric pressure reactor containing a locally heated metal catalyst (Fe on Al2O3). Using these compound-specific experiments, we demonstrate that many alkynes (e.g., acetylene, methyl acetylene, and vinyl acetylene) accelerate multiwalled CNT formation with this catalyst system. Furthermore, ethylene is required for enhanced CNT growth, suggesting that the alkyne and ethylene may react in concert at the metal catalyst. This presents a di...

Authors:   Desirée L. Plata; Eric R. Meshot; Christopher M. Reddy; A. John Hart; Philip M. Gschwend
Journal:   ACS Nano
Year:   2010
DOI:   10.1021/nn101842g
Publication date:   28-Dec-2010
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