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 Title: |
US6582673:
Carbon nanotube with a graphitic outer layer: process and application
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Chow, Lee; Orlando, FL
Zhou, Dan; Orlando, FL
Kleckley, Stephen; Orlando, FL
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| Assignee: |
University of Central Florida, Orlando, FL
other patents from UNIVERSITY OF CENTRAL FLORIDA (599435) (approx. 135)
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| Published / Filed: |
2003-06-24
/ 2000-03-17
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| Application Number: |
US2000000528259
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| IPC Code: |
Advanced:
C01B 31/02;
Core:
C01B 31/00;
IPC-7:
B32B 5/16;
C01B 31/04;
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| ECLA Code: |
C01B31/02B;
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| U.S. Class: |
423/445.R;
423/445.B;
423/448;
423/460;
428/403;
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| Field of Search: |
428/403
423/445 R,448,460,445 B,DIG. 39
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| Priority Number: |
| 2000-03-17 |
US2000000528259 |
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| Abstract: |
A method for manufacturing carbon nanotubes with an integrally attached outer graphitic layer is disclosed. The graphitic layer improves the ability to handle and manipulate the nanometer size nanotube device in various applications, such as a probe tip in scanning probe microscopes and optical microscopes, or as an electron emitting device. A thermal chemical vapor deposition reactor is the preferred reaction vessel in which a transition metal catalyst with an inert gas, hydrogen gas and a carbon-containing gas mixture are heated at various temperatures in a range between 500° C. and 1000° C. with gases and temperatures being adjusted periodically during the reaction times required to grow the nanotube core and subsequently grow the desired outer graphitic layer.
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| Attorney, Agent or Firm: |
Steinberger, Brian S.Law Offices of Brian S. Steinberger, P.A. ;
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| Primary / Asst. Examiners: |
Le, H. Thi;
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| INPADOC Legal Status: |
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| Family: |
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First Claim:
Show all 14 claims |
We claim:
1. A method for manufacturing a carbon nanotube device consisting of a carbon nanotube core having an integrally attached outer graphitic layer comprising the steps of:
- a) preparing a transition metal catalyst on a selected substrate;
- b) placing the transition metal catalyst and substrate of step (a) in a reaction vessel;
- c) purging the reaction vessel of step (b) by heating said vessel to a temperature between 500° C. and 750° C. while introducing a gaseous mixture of hydrogen and an inert gas;
- d) growing a carbon nanotube core by changing the gaseous mixture of step (c) to a stream consisting of approximately 10% carbon-containing gas and approximately 90% inert gas, while increasing the temperature of the reaction vessel to a range between 750° C. and 900° C.;
- e) growing an integrally attached graphitic outer layer on the carbon nanotube core of step (d) by changing the reaction parameters to promote the distinct formation of carbon material selected from the group consisting of amorphous carbon, graphitic carbon and mixtures thereof;
- f) removing the carbon nanotube with graphitic outer layer of step (e) from the reaction vessel; and
- g) mechanically breaking away a portion of the graphitic outer layer to leave the carbon nanotube core partially exposed.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 10 U.S. patent(s) that reference this one
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