Ming Z Zheng

US Patent:

20210399225, Dec 23, 2021

Filed:

Oct 9, 2020

Appl. No.:

17/066565

Inventors:

- Gaithersburg MD, US
Ming Zheng - Rockville MD, US

International Classification:

H01L 51/00
G01J 3/28
G01J 3/02

Abstract:

A nanotube spectrometer array includes: a substrate including block receivers; photodetectors arranged in an array with each photodetector including: a single wall carbon nanotube disposed on the substrate in a block receiver and disposed laterally along the block receiver; a source electrode on the single wall carbon nanotube; a drain electrode on the single wall carbon nanotube, such that the source and drain electrodes are separated from each other by a photoreceiver portion of the single wall carbon nanotube; and a gate electrode disposed on the substrate such that substrate is interposed between the gate electrode and the single wall carbon nanotube. The single wall carbon nanotube in each photodetector is a different chirality so that each photodetector absorbs light with a maximum photon absorptivity at a difference wavelength that is based on the chirality of the single wall carbon nanotube of the photodetector.

US Patent:

20180016148, Jan 18, 2018

Filed:

Jan 22, 2016

Appl. No.:

15/545659

Inventors:

Jason K. Streit - Gaithersburg MD, US
Angela R. Hight Walker - Gaithersburg MD, US
Ming Zheng - Gaithersburg MD, US
- Los Angeles CA, US
Ming Zheng - Rockville MD, US

International Classification:

C01B 32/172
C01B 32/17
B82Y 30/00
B82Y 40/00

Abstract:

A method of separating and extracting carbon nanotubes, the method includes introducing the carbon nanotubes into a two-phase system that includes a first component and a second component, the first component being different from the second component. The method includes introducing a chemical agent into the two-phase system, mixing the chemical agent and the carbon nanotubes in the two-phase system, removing the first component to extract a first portion of the carbon nanotubes contained in the first component after the mixing, replenishing the two-phase system with fresh first component, and extracting a second portion of the carbon nanotubes contained in the fresh first component. A bandgap of the carbon nanotubes in the first portion is different from the bandgap of the carbon nanotubes in the second portion.

US Patent:

20140174991, Jun 26, 2014

Filed:

Feb 25, 2014

Appl. No.:

14/189619

Inventors:

CONSTANTINE Y. KHRIPIN - GAITHERSBURG MD, US
MING ZHENG - ROCKVILLE MD, US

Assignee:

NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY - GAITHERSBURG MD

International Classification:

B03B 5/00

US Classification:

209 31, 977845

Abstract:

A process for fractionating a nanoparticle composition, the process includes combining a first polymer, a second polymer, and a solvent to form a fluid and contacting the nanoparticle composition with the fluid. The nanoparticle composition includes a plurality of first nanoparticles, a plurality of second nanoparticles, and a dispersant disposed on an exterior surface of the first nanoparticles and the second nanoparticles. Fractionating the nanoparticle composition also includes forming a multiphase composition that includes a first phase and a second phase by partitioning the first polymer and the second polymer such that a concentration of the first polymer is greater than a concentration of the second polymer in the first phase, and the concentration of the second polymer is greater than the first polymer in the second phase, wherein the solvent is present in the first phase and the second phase. Additionally, the process includes apportioning the first nanoparticles and the second nanoparticles among the first phase and the second phase to fractionate the nanoparticle composition, based on a relative affinity of the first nanoparticles and the second nanoparticles for the first polymer and the second polymer, wherein the first nanoparticles are present in the first phase and substantially absent in the second phase, and the second nanoparticles are present in the second phase and substantially absent in the first phase.