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Title: Laser ablation for the synthesis of carbon nanotubes

Abstract

Single walled carbon nanotubes are produced in a novel apparatus by the laser-induced ablation of moving carbon target. The laser used is of high average power and ultra-fast pulsing. According to various preferred embodiments, the laser produces an output above about 50 watts/cm.sup.2 at a repetition rate above about 15 MHz and exhibits a pulse duration below about 10 picoseconds. The carbon, carbon/catalyst target and the laser beam are moved relative to one another and a focused flow of "side pumped", preheated inert gas is introduced near the point of ablation to minimize or eliminate interference by the ablated plume by removal of the plume and introduction of new target area for incidence with the laser beam. When the target is moved relative to the laser beam, rotational or translational movement may be imparted thereto, but rotation of the target is preferred.

Inventors:
; ; ; ;
Issue Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1176217
Patent Number(s):
7692116
Application Number:
10/188,525
Assignee:
Jefferson Science Associates (Newport News, VA)
Patent Classifications (CPCs):
C - CHEMISTRY C23 - COATING METALLIC MATERIAL C23C - COATING METALLIC MATERIAL
C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS
DOE Contract Number:  
AC05-84ER40150
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Holloway, Brian C., Eklund, Peter C., Smith, Michael W., Jordan, Kevin C., and Shinn, Michelle. Laser ablation for the synthesis of carbon nanotubes. United States: N. p., 2010. Web.
Holloway, Brian C., Eklund, Peter C., Smith, Michael W., Jordan, Kevin C., & Shinn, Michelle. Laser ablation for the synthesis of carbon nanotubes. United States.
Holloway, Brian C., Eklund, Peter C., Smith, Michael W., Jordan, Kevin C., and Shinn, Michelle. Tue . "Laser ablation for the synthesis of carbon nanotubes". United States. https://www.osti.gov/servlets/purl/1176217.
@article{osti_1176217,
title = {Laser ablation for the synthesis of carbon nanotubes},
author = {Holloway, Brian C. and Eklund, Peter C. and Smith, Michael W. and Jordan, Kevin C. and Shinn, Michelle},
abstractNote = {Single walled carbon nanotubes are produced in a novel apparatus by the laser-induced ablation of moving carbon target. The laser used is of high average power and ultra-fast pulsing. According to various preferred embodiments, the laser produces an output above about 50 watts/cm.sup.2 at a repetition rate above about 15 MHz and exhibits a pulse duration below about 10 picoseconds. The carbon, carbon/catalyst target and the laser beam are moved relative to one another and a focused flow of "side pumped", preheated inert gas is introduced near the point of ablation to minimize or eliminate interference by the ablated plume by removal of the plume and introduction of new target area for incidence with the laser beam. When the target is moved relative to the laser beam, rotational or translational movement may be imparted thereto, but rotation of the target is preferred.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2010},
month = {4}
}

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