Jason J Stephenson

US Patent:

7704323, Apr 27, 2010

Filed:

Jan 23, 2006

Appl. No.:

11/337456

Inventors:

James M. Tour - Bellaire TX, US
Jianli He - Houston TX, US
Bo Chen - Sugar Land TX, US
Austen K. Flatt - Houston TX, US
Jason J. Stephenson - Humble TX, US
Condell D. Doyle - Nocona TX, US

Assignee:

William Marsh Rice University - Houston TX

International Classification:

C30B 21/02

US Classification:

117 84, 117 90, 117 95, 117 96

Abstract:

Work from several laboratories has shown that metal nanofilaments cause problems in some molecular electronics testbeds. A new testbed for exploring the electrical properties of single molecules has been developed to eliminate the possibility of metal nanofilament formation and to ensure that molecular effects are measured. This metal-free system uses single-crystal silicon and single-walled carbon nanotubes as electrodes for the molecular monolayer. A direct Si-arylcarbon grafting method is used. Use of this structure with π-conjugated organic molecules results in a hysteresis loop with current-voltage measurements that are useful for an electronic memory device. The memory is non-volatile for more than 3 days, non-destructive for more than 1,000 reading operations and capable of more than 1,000 write-erase cycles before device breakdown. Devices without π-conjugated molecules (Si—H surface only) or with long-chain alkyl-bearing molecules produced no hysteresis, indicating that the observed memory effect is molecularly relevant.

US Patent:

8080199, Dec 20, 2011

Filed:

Aug 17, 2007

Appl. No.:

11/840422

Inventors:

James M. Tour - Bellaire TX, US
Christopher A. Dyke - Humble TX, US
Jason J. Stephenson - McLean VA, US
Boris I. Yakobson - Houston TX, US

Assignee:

William Marsh Rice University - Houston TX

International Classification:

B29C 35/08

US Classification:

264494, 264490, 20415743, 20415747

Abstract:

The present invention is directed toward methods of crosslinking carbon nanotubes to each other using microwave radiation, articles of manufacture produced by such methods, compositions produced by such methods, and applications for such compositions and articles of manufacture. The present invention is also directed toward methods of radiatively modifying composites and/or blends comprising carbon nanotubes with microwaves, and to the compositions produced by such methods. In some embodiments, the modification comprises a crosslinking process, wherein the carbon nanotubes serve as a conduit for thermally and photolytically crosslinking the host matrix with microwave radiation.

US Patent:

20040222080, Nov 11, 2004

Filed:

Dec 17, 2003

Appl. No.:

10/738168

Inventors:

James Tour - Bellaire TX, US
Christopher Dyke - Houston TX, US
Jason Stephenson - Humble TX, US
Boris Yakobson - Houston TX, US

Assignee:

William Marsh Rice University - Houston TX

International Classification:

C07C006/00

US Classification:

204/157150

Abstract:

The present invention is directed toward methods of crosslinking carbon nanotubes to each other using microwave radiation, articles of manufacture produced by such methods, compositions produced by such methods, and applications for such compositions and articles of manufacture. The present invention is also directed toward methods of radiatively modifying composites and/or blends comprising carbon nanotubes with microwaves, and to the compositions produced by such methods. In some embodiments, the modification comprises a crosslinking process, wherein the carbon nanotubes serve as a conduit for thermally and photolytically crosslinking the host matrix with microwave radiation.

US Patent:

20040222081, Nov 11, 2004

Filed:

Dec 17, 2003

Appl. No.:

10/738459

Inventors:

James Tour - Bellaire TX, US
Jason Stephenson - Humble TX, US
Timothy Imholt - Carrollton TX, US
Christopher Dyke - Houston TX, US
Boris Yakobson - Houston TX, US
James Roberts - Krum TX, US

International Classification:

C07C006/00

US Classification:

204/157150

Abstract:

The present invention is directed toward methods of crosslinking carbon nanotubes to each other using microwave radiation, articles of manufacture produced by such methods, compositions produced by such methods, and applications for such compositions and articles of manufacture. The present invention is also directed toward methods of radiatively modifying composites and/or blends comprising carbon nanotubes with microwaves, and to the compositions produced by such methods. In some embodiments, the modification comprises a crosslinking process, wherein the carbon nanotubes serve as a conduit for thermally and photolytically crosslinking the host matrix with microwave radiation.

US Patent:

20060178462, Aug 10, 2006

Filed:

Jun 18, 2004

Appl. No.:

10/560291

Inventors:

James Tour - Bellairs TX, US
Joshua Jurs - Houston TX, US
Jason Stephenson - Humble TX, US

Assignee:

William Marsh Rice University - Houston TX

International Classification:

C08F 4/04
C07C 25/13

US Classification:

524430000, 526219600, 526319000, 526227000, 570128000

Abstract:

The present invention is directed to novel flame retardant monomers and polymers, wherein the flame retardant properties of the polymers are provided by functionality in pendant groups attached to a polymer backbone (as opposed to the polymer backbone itself possessing flame retardant properties. The present invention is also directed to methods of making such polymers and monomers, and articles of manufacture incorporating such monomers and polymers.

US Patent:

20070280876, Dec 6, 2007

Filed:

Mar 24, 2005

Appl. No.:

10/593918

Inventors:

James Tour - Houston TX, US
Jared Hudson - Houston TX, US
Christopher Dyke - Humble TX, US
Jason Stephenson - McLean VA, US

Assignee:

William Marsh Rice University - Houston TX

International Classification:

C01B 31/02

US Classification:

423460000

Abstract:

The present invention is generally directed to methods of functionalizing carbon nanotubes (CNTs) in acidic media. By first dispersing CNTs in an acidic medium, bundled CNTs can be separated as individual CNTs, affording exposure of the CNT sidewalls, and thereby facilitating the functionalization of such CNTs, wherein functional groups are attached to the subsequently exposed sidewalls of these individualized CNTs. Once dispersed in this substantially unhundled state, the CNTs are functionalized according to one or more of a variety of functionalization processes. Typically, ultrasonication or non-covalent wrapping is not needed to afford such dispersion and subsequent functionalization. Additionally, such methods are easily scalable and can provide for sidewall-functionalized CNTs in large, industrial-scale quantities.