The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 26, 2013
Filed:
May. 01, 2008
Avetik R. Harutyunyan, Columbus, OH (US);
Elena Mora, Columbus, OH (US);
Avetik R. Harutyunyan, Columbus, OH (US);
Elena Mora, Columbus, OH (US);
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
Methods and processes for synthesizing high quality carbon single-walled nanotubes (SWNTs) are provided. The method provides the means for optimization of amount of carbon precursor and transport gas per unit weight of catalyst. In certain aspects, methods are provided wherein a supported metal catalyst is contacted with a carbon precursor gas at about one atmosphere pressure, wherein SWNTs are synthesized at a growth rate of about 0.002 μm/sec to about 0.003 μm/sec and the SWNTs have a ratio of G-band to D-band in Raman spectra (I:I) of greater than about 4. Efficiencies of about 20% can be achieved when contacting the catalyst deposited on a support with a carbon precursor gas with a flow rates of about 4.2×10mol CH/sec·g (Fe) at 780° C. Hydrocarbon flow rates of about 1.7 10mol CH/sec·g (Fe) and higher result in faster carbon SWNTs growth with improved quality. Slower rates of carbon atoms supply (˜4.5×10C atoms/s·g Fe or 6.4×10mol CH/sec·g (Fe)) result in the formation of more defective nanotubes.