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Daniel Resasco
D. and H. Bourne Chair and George Lynn Cross Professor
School of Chemical, Biological and Materials Engineering
University of Oklahoma
100 East Boyd St, Norman, Oklahoma 73019 USA

Phone: (405) 325-4370
Fax: (405) 325-5813
E-mail:
resasco@ou.edu

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Role of water on the surface-guided growth of horizontally aligned
single-walled carbon nanotubes on quartz

The role of water in carbon feed on the surface-guided growth of horizontally aligned single-walled carbon
nanotubes (HA-SWCNTs) was investigated. It is shown that the amount of water can be optimized to favor HA-SWCNT growth, which is proposed to be due to selective etching of carbon deposits at carbon–metal interface. Without water, nanotube–nanotube interaction and carbon accumulation at the interface are disproportionately large compared to the rate of nanotube growth, leading to catalyst deactivation. With excess water, suppression of nanotube growth occurs, resulting in reduced carbon yield on the surface.
Intermediate carbon/water feed ratios achieve cleaner growth with high efficiency.

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