Linh Tung Le

US Patent:

20120170171, Jul 5, 2012

Filed:

Nov 21, 2011

Appl. No.:

13/301124

Inventors:

Woo Young Lee - Ridgewood NJ, US
Linh Le - New York NY, US
De Kong - Hoboken NJ, US
Matthew Henderson Ervin - Clarksville MD, US
Brian E. Fuchs - Hackettstown NJ, US

International Classification:

H01G 9/155
H01G 9/145
H01G 9/15
H05K 1/00

US Classification:

361502, 174254, 361503, 361523

Abstract:

An electrical component includes an inkjet-printed graphene electrode. Graphene oxide flakes are deposited on a substrate in a graphene oxide ink using an inkjet printer. The deposited graphene oxide is thermally reduced to graphene. The electrical properties of the electrode are comparable to those of electrodes made using activated carbon, carbon nanotubes or graphene made by other methods. The electrical properties of the graphene electrodes may be tailored by adding nanoparticles of other materials to the ink to serve as conductivity enhancers, spacers, or to confer pseudocapacitance. Inkjet-printing can be used to make graphene electrodes of a desired thickness in preselected patterns. Inkjet printing can be used to make highly-transparent graphene electrodes. Inkjet-printed graphene electrodes may be used to fabricate double-layer capacitors that store energy by nanoscale charge separation at the electrode-electrolyte interface (i.e., “supercapacitors”).

US Patent:

20160016802, Jan 21, 2016

Filed:

Sep 25, 2015

Appl. No.:

14/865844

Inventors:

- Hoboken NJ, US
Thomas A. Bechtold - Morristown NJ, US
Linh Tung Le - New York NY, US
Woo Young Lee - Ridgewood NJ, US

Assignee:

THE TRUSTEES OF THE STEVENS INSTITUTE OF TECHNOLOGY - Hoboken NJ

International Classification:

C01B 31/04

Abstract:

Granules of graphene oxide may be produced from a dispersion of nanoscale graphene oxide sheets by a spray drying method. Such granules have a three-dimensional corrugated morphology. The complexity of the corrugations, and the s size distribution of the granules can be varied through selection of the spray-drying equipment used, and variation of the composition of the dispersion and the spray-drying parameters. Structural modifiers may be included in the graphene oxide dispersion to control the ultimate morphology of the granules. The granules of graphene oxide may be thermally reduced at a moderate temperature of 220 C. to increase the granules' electrical conductivity. The reduced granules may be used to fabricate electrodes for supercapacitors. The power and energy density of such an electrode material is comparable to those of conventional/commercial activated carbon-based electrodes.

US Patent:

20140103298, Apr 17, 2014

Filed:

Oct 14, 2013

Appl. No.:

14/053232

Inventors:

- Hoboken NJ, US
Linh Tung Le - New York NY, US
De Kong - Wood-Ridge NJ, US

International Classification:

H01L 37/00
G01N 33/48
H01L 41/02

US Classification:

257 29

Abstract:

An environmental sensor comprises a graphene thin-film as an environmentally responsive material. Such graphene films exhibit negative temperature coefficients (NTC), resulting in rapid decreases in electrical resistance as temperature increases, as well as a much faster response time than any other NTC material reported in the literature. The graphene film is also mechanically stable under bending, and, therefore, can be adapted for use in a mechanical sensor or pressure sensor, because the electrical resistance of the graphene film changes upon deflection and/or changes in pressure. The electrical resistance of the graphene film also increases in response to increases in environmental humidity. The electrical resistance changes of the graphene film can also be used as a sensing mechanism for changes in chemical and biological parameters in the environment of the sensor.