Kyung Hwa Lee

US Patent:

8409768, Apr 2, 2013

Filed:

Oct 12, 2010

Appl. No.:

12/902392

Inventors:

Jae Hak Kim - Plano TX, US
Gil Sik Lee - Lewisville TX, US
Kyung Hwan Lee - Dallas TX, US
Lawrence J. Overzet - Richardson TX, US

Assignee:

Board of Regents, The University of Texas Systems - Austin TX

International Classification:

B82Y 30/00
B82Y 40/00
C01B 31/02
D01F 9/127

US Classification:

429528, 977755, 977742, 427113, 4234472, 4234473, 429532, 4292318

Abstract:

Growing spin-capable multi-walled carbon nanotube (MWCNT) forests in a repeatable fashion will become possible through understanding the critical factors affecting the forest growth. Here we show that the spinning capability depends on the alignment of adjacent MWCNTs in the forest which in turn results from the synergistic combination of a high areal density of MWCNTs and short distance between the MWCNTs. This can be realized by starting with both the proper Fe nanoparticle size and density which strongly depend on the sheet resistance of the catalyst film. Simple measurement of the sheet resistance can allow one to reliably predict the growth of spin-capable forests. The properties of pulled MWCNTs sheets reflect that there is a relationship between their electrical resistance and optical transmittance. Overlaying either 3, 5, or 10 sheets pulled out from a single forest produces much more repeatable characteristics.

US Patent:

20130224371, Aug 29, 2013

Filed:

Apr 1, 2013

Appl. No.:

13/854747

Inventors:

Jae Hak Kim - Plano TX, US
Gil Sik Lee - Lewisville TX, US
Kyung Hwan Lee - Dallas TX, US
Lawrence J. Overzet - Richardson TX, US

Assignee:

THE BOARD OF REGENTS OF THE UNIVERSITY OF TEXAS SYSTEM - Austin TX

International Classification:

H01M 4/04
H01M 4/88

US Classification:

427115, 4271263, 4271266, 205159, 977742

Abstract:

Growing spin-capable multi-walled carbon nanotube (MWCNT) forests in a repeatable fashion will become possible through understanding the critical factors affecting the forest growth. Here we show that the spinning capability depends on the alignment of adjacent MWCNTs in the forest which in turn results from the synergistic combination of a high areal density of MWCNTs and short distance between the MWCNTs. This can be realized by starting with both the proper Fe nanoparticle size and density which strongly depend on the sheet resistance of the catalyst film. Simple measurement of the sheet resistance can allow one to reliably predict the growth of spin-capable forests. The properties of pulled MWCNTs sheets reflect that there is a relationship between their electrical resistance and optical transmittance. Overlaying either 3, 5, or 10 sheets pulled out from a single forest produces much more repeatable characteristics.