Oomman K Varghese

US Patent:

20050224360, Oct 13, 2005

Filed:

Apr 2, 2004

Appl. No.:

10/817354

Inventors:

Oomman Varghese - State College PA, US
Gopal Mor - State College PA, US
Maggie Paulose - State College PA, US
Craig Grimes - Boalsburg PA, US

International Classification:

C25D005/00
C25D005/48

US Classification:

205171000, 205189000, 205191000, 205192000, 205193000, 205220000, 205224000

Abstract:

An electrical resistive device for sensing hydrogen gas, including: an array of titania nanotubes open at an outwardly-directed end formed by anodizing at least a portion of a titanium layer; a plurality of palladium (or other noble metal) clusters having been deposited atop the nanotube array; and the nanotube array mechanically supported by an integral support member. The array of titania nanotubes may include a dopant in an amount less than 1% by mass. An exposure of the titania nanotube array to radiant energy emitted within a range of frequencies from visible to ultraviolet, in the presence of oxygen, removes at least a portion of a contaminant, if present on the titania nanotubes. The titanium layer may be deposited atop the integral support; or the unique doped titanium layer can be produced, prior to the anodizing thereof, by depositing titanium along with dopant atop the integral support member by a co-deposition process. The titanium layer may be a titanium foil or doped titanium foil. The device, as adapted for use to remove a contaminant (such as liquid crude petroleum, pathogens, e.g., virus, bacteria, fungi, and proteins) from the array of nanotubes, will do so photocatalytically by exposure thereof to radiant energy emitted within a range of frequencies from visible to ultraviolet, in the presence of oxygen. Also, supported is: method(s) of producing the electrical resistive devices for sensing hydrogen gas.

US Patent:

20100187172, Jul 29, 2010

Filed:

Jan 25, 2010

Appl. No.:

12/693123

Inventors:

MAGGIE PAULOSE - State College PA, US
KARTHIK SHANKAR - Edmonton, CA
HARIPRIYA E. PRAKASAM - San Jose CA, US
OOMMAN K. VARGHESE - State College PA, US
CRAIG A. GRIMES - Boalsburg PA, US

Assignee:

THE PENN STATE RESEARCH FOUNDATION - University Park PA

International Classification:

C25D 11/34
H01L 31/0216
B32B 15/04
B01D 39/14

US Classification:

210506, 205322, 136256, 205 50

Abstract:

Fabrication of self-aligned closed packed titania nanotube arrays in excess of 10 μm in length and aspect ratio ≈10,000 by potentiostatic anodization of titanium is disclosed. Conditions for achieving complete anodization and absolute tailorability of Ti foil samples resulting in a self-standing mechanically robust titania membrane in excess of 1000 μm are also disclosed.

US Patent:

20100213046, Aug 26, 2010

Filed:

Jan 5, 2010

Appl. No.:

12/655753

Inventors:

Craig A. Grimes - Boalsburg PA, US
Oomman K. Varghese - State College PA, US
Maggie Paulose - State College PA, US

Assignee:

The Penn State Research Foundation - University Park PA

International Classification:

C01B 31/00
B01J 27/24
B01J 21/18
C01B 3/00

US Classification:

20415747, 502200, 502182, 20415752, 977762, 977773, 977775

Abstract:

Nitrogen-doped titania nanotubes exhibiting catalytic activity on exposure to any one or more of ultraviolet, visible, and/or infrared radiation, or combinations thereof are disclosed. The nanotube arrays may be co-doped with one or more nonmetals and may further include co-catalyst nanoparticles. Also, methods are disclosed for use of nitrogen-doped titania nanotubes in catalytic conversion of carbon dioxide alone or in admixture with hydrogen-containing gases such as water vapor and/or other reactants as may be present or desirable into products such as hydrocarbons and hydrocarbon-containing products, hydrogen and hydrogen-containing products, carbon monoxide and other carbon-containing products, or combinations thereof.

US Patent:

20140261688, Sep 18, 2014

Filed:

Mar 13, 2014

Appl. No.:

14/209740

Inventors:

- Perrysburg OH, US
Zhigang Ban - Perrysburg OH, US
Benyamin Buller - Sylvania OH, US
Markus Gloeckler - Perrysburg OH, US
Benjamin Milliron - Toledo OH, US
Xilin Peng - Bloomington MN, US
Rick C. Powell - Ann Arbor MI, US
Jigish Trivedi - Perrysburg OH, US
Oomman K. Varghese - Houston TX, US
Jianjun Wang - Perrysburg OH, US
Zhibo Zhao - Novi MI, US

Assignee:

FIRST SOLAR, INC - Perrysburg OH

International Classification:

H01L 31/0296
H01L 31/18

US Classification:

136260, 438 95

Abstract:

A photovoltaic device is disclosed including at least one Cadmium Sulfide Telluride (CdSTe) layer as are methods of forming such a photovoltaic device.