Carbon nanotube purification

Details Carbon nanotube purification Carbon nanotube purification

2005-12-06

2005-12-06

Markoff, Alexander (Department: 1746)

Cleaning and liquid contact with solids

Processes

Including application of electrical radiant or wave energy...

C134S001000, C134S002000, C134S022110, C134S022150

Reexamination Certificate

active

06972056

ABSTRACT:
A method for cleaning or otherwise removing amorphous carbon and other residues that arise in growth of a carbon nanotube (CNT) array. The CNT array is exposed to a plurality of hydroxyls or hydrogen, produced from a selected vapor or liquid source such as H2O or H2O2, and the hydroxyls or hydrogen (neutral or electrically charged) react with the residues to produce partly or fully dissolved or hydrogenated or hydroxylizated products that can be removed or separated from the CNT array. The hydroxyls or hydrogen can be produced by heating the CNT array, residue and selected vapor or liquid source or by application of an electromagnetic excitation signal with a selected frequency or range of frequencies to dissociate the selected vapor or liquid. The excitation frequency can be “chirped” to cover a selected range of frequencies corresponding to dissociation of the selected vapor or liquid. Sonication may be used to supplement dissociation of the H2O and/or H2O2.

REFERENCES:
patent: 5641466 (1997-06-01), Ebbesen et al.
patent: 6752977 (2004-06-01), Smalley et al.
patent: 2002/0092984 (2002-07-01), Colbert et al.
patent: 2003/0042128 (2003-03-01), Harutyunyan et al.
Gorelik et al,. Purification Procedures for Single-Wall Carbon Nanotubes, NASA/CR-2000-208926, May, 2001.
Hernadi et al., “Reactivity of different kinds of carbon during oxidative purification of catalytically prepared carbon nanotubes” Solid State Ionics 141-142, pp. 203-209, 2001.
Tohji et al., “Extraction of exotic fullerenes and purification of single-walled nanotubes,” Fullerene Science and Tecnology vol. 7, No. 4, pp. 665-679, Jul. 1999.
Ko et al., “Highly efficient microwave-assisted purification of multiwalled carbon nanotubes,” Microelectronic Engineering 73-74, pp. 570-577, Jun. 2004.
S.B. Hawthorne et al, “Extraction of Organic Pollutants from Env.” Analytical Chemistry, vol. 66 (1994) pp. 2912-2920.
G.L. Bakker et al, “Surface Cleaning and Carbonaceous Film . . . ” Jour Electrochem Soc. vol. 145 (1998) pp. 284-291.
Young Soo Park et al, “High yield purification of multiwalled . . . ” Carbon vol. 39 (2001) pp. 655-661.
M. Monthioux et al, “Sensitivity of single wall carbon nanotubes” Carbon vol. 39 (2001) pp. 1251-1272.
R. Andrews et al, “Purification and structural annealing of . . . ” Carbon vol. 39 (2001) pp. 1681-1687.
P.X. Hou et al, “Multi-step purification of carbon nanotubes” Carbon vol. 40 (2002) pp. 81-85.
K. Hernadi et al,“Reactivity of different kinds of carbon during . . . ” Solid State Ionics vol. 141-142 (2001) pp. 203-209.
A. Koshio et al, “Thermal degradation of ragged single wall . . . ” Chem. Phys. Lett. vol. 341 (2001) pp. 461-466.
Jeong-Mi Moon, “High Yield Purification of Singlewalled . . . ” Jour. Phys. Chem. B, vol. 105 (2001) pp. 5677-5681.
I.W. Chiang et al, “Purification and Characterization of Single . . . ” Jour. Phys. Chem B vol. 105 (2001) pp. 8297-8301.
W.L. Suchanek et al, “Stability of fullerenes under hydrothermal” Jour. Mater. Res. vol. 14 (1999) pp. 323-326.
J.L. Zimmerman et al “Gas-Phase Purification of Carbon Single . . . ” Chem. Mater. vol. 12 (2000) pp. 1361-1366.

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