Patents by Inventor Chunming Niu

Chunming Niu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20070247904
    Abstract: Methods and apparatuses for nanoenabled memory devices and anisotropic charge carrying arrays are described. In an aspect, a memory device includes a substrate, a source region of the substrate, and a drain region of the substrate. A population of nanoelements is deposited on the substrate above a channel region, the population of nanolements in one embodiment including metal quantum dots. A tunnel dielectric layer is formed on the substrate overlying the channel region, and a metal migration barrier layer is deposited over the dielectric layer. A gate contact is formed over the thin film of nanoelements. The nanoelements allow for reduced lateral charge transfer. The memory device may be a single or multistate memory device.
    Type: Application
    Filed: June 22, 2007
    Publication date: October 25, 2007
    Applicant: NANOSYS, INC.
    Inventors: Xiangfeng Duan, Calvin Chow, David Heald, Chunming Niu, J. Parce, David Stumbo
  • Publication number: 20070238314
    Abstract: The present invention relates to a system and process for producing a nanowire-material composite. A substrate having nanowires attached to a portion of at least one surface is provided. A material is deposited over the portion to form the nanowire-material composite. The process further optionally comprises separating the nanowire-material composite from the substrate to form a freestanding nanowire-material composite. The freestanding nanowire material composite is optionally further processed into a electronic substrate. A variety of electronic substrates can be produced using the methods described herein. For example, a multi-color light-emitting diode can be produced from multiple, stacked layers of nanowire-material composites, each composite layer emitting light at a different wavelength.
    Type: Application
    Filed: September 14, 2005
    Publication date: October 11, 2007
    Applicant: Nanosys, Inc.
    Inventors: Mihai Buretea, Jian Chen, Calvin Chow, Chunming Niu, Yaoling Pan, J. Parce, Linda Romano, David Stumbo
  • Publication number: 20070228439
    Abstract: A method and apparatus for an electronic substrate having a plurality of semiconductor devices is described. A thin film of nanowires is formed on a substrate. The thin film of nanowires is formed to have a sufficient density of nanowires to achieve an operational current level. A plurality of semiconductor regions are defined in the thin film of nanowires. Contacts are formed at the semiconductor device regions to thereby provide electrical connectivity to the plurality of semiconductor devices. Furthermore, various materials for fabricating nanowires, thin films including p-doped nanowires and n-doped nanowires, nanowire heterostructures, light emitting nanowire heterostructures, flow masks for positioning nanowires on substrates, nanowire spraying techniques for depositing nanowires, techniques for reducing or eliminating phonon scattering of electrons in nanowires, and techniques for reducing surface states in nanowires are described.
    Type: Application
    Filed: June 8, 2007
    Publication date: October 4, 2007
    Applicant: NANOSYS, INC.
    Inventors: Xiangfeng Duan, Chunming Niu, Stephen Empedocles, Linda Romano, Jian Chen, Vijendra Sahi, Lawrence Bock, David Stumbo, J. Parce, Jay Goldman
  • Patent number: 7273732
    Abstract: The present invention is directed to systems and methods for nanowire growth and harvesting. In an embodiment, methods for nanowire growth and doping are provided, including methods for epitaxial oriented nanowire growth using a combination of silicon precursors. In a further aspect of the invention, methods to improve nanowire quality through the use of sacrifical growth layers are provided. In another aspect of the invention, methods for transferring nanowires from one substrate to another substrate are provided.
    Type: Grant
    Filed: July 21, 2006
    Date of Patent: September 25, 2007
    Assignee: Nanosys, Inc.
    Inventors: Yaoling Pan, Xiangfeng Duan, Robert S. Dubrow, Jay L. Goldman, Shahriar Mostarshed, Chunming Niu, Linda T. Romano, Dave Stumbo
  • Publication number: 20070212538
    Abstract: The present invention is directed to nanowire structures and interconnected nanowire networks comprising such structures, as well as methods for their production. The nanowire structures comprise a nanowire core, a carbon-based layer, and in additional embodiments, carbon-based structures such as nanographitic plates consisting of graphenes formed on the nanowire cores, interconnecting the nanowire structures in the networks. The networks are porous structures that can be formed into membranes or particles. The nanowire structures and the networks formed using them are useful in catalyst and electrode applications, including fuel cells, as well as field emission devices, support substrates and chromatographic applications.
    Type: Application
    Filed: November 20, 2006
    Publication date: September 13, 2007
    Applicant: NANOSYS, Inc.
    Inventor: Chunming Niu
  • Publication number: 20070202033
    Abstract: Compositions including carbide-containing nanorods and/or oxycarbide-containing nanorods and/or carbon nanotubes bearing carbides and oxycarbides and methods of making the same are provided. Rigid porous structures including oxycarbide-containing nanorods and/or carbide containing nanorods and/or carbon nanotubes bearing carbides and oxycarbides and methods of making the same are also provided. The compositions and rigid porous structures of the invention can be used either as catalyst and/or catalyst supports in fluid phase catalytic chemical reactions. Processes for making supported catalyst for selected fluid phase catalytic reactions are also provided.
    Type: Application
    Filed: May 2, 2007
    Publication date: August 30, 2007
    Applicant: Hyperion Catalysis International, Inc.
    Inventors: David Moy, Chunming Niu, Jun Ma, Jason Willey
  • Patent number: 7262501
    Abstract: A method and apparatus for an electronic substrate having a plurality of semiconductor devices is described. A thin film of nanowires is formed on a substrate. The thin film of nanowires is formed to have a sufficient density of nanowires to achieve an operational current level. A plurality of semiconductor regions are defined in the thin film of nanowires. Contacts are formed at the semiconductor device regions to thereby provide electrical connectivity to the plurality of semiconductor devices. Furthermore, various materials for fabricating nanowires, thin films including p-doped nanowires and n-doped nanowires, nanowire heterostructures, light emitting nanowire heterostructures, flow masks for positioning nanowires on substrates, nanowire spraying techniques for depositing nanowires, techniques for reducing or eliminating phonon scattering of electrons in nanowires, and techniques for reducing surface states in nanowires are described.
    Type: Grant
    Filed: April 18, 2006
    Date of Patent: August 28, 2007
    Assignee: Nanosys, Inc.
    Inventors: Xiangfeng Duan, Chunming Niu, Stephen Empedocles
  • Publication number: 20070187768
    Abstract: Methods and apparatuses for nanoenabled memory devices and anisotropic charge carrying arrays are described. In an aspect, a memory device includes a substrate, a source region of the substrate, and a drain region of the substrate. A population of nanoelements is deposited on the substrate above a channel region, the population of nanolements in one embodiment including metal quantum dots. A tunnel dielectric layer is formed on the substrate overlying the channel region, and a metal migration barrier layer is deposited over the dielectric layer. A gate contact is formed over the thin film of nanoelements. The nanoelements allow for reduced lateral charge transfer. The memory device may be a single or multistate memory device.
    Type: Application
    Filed: April 3, 2007
    Publication date: August 16, 2007
    Applicant: NANOSYS, INC.
    Inventors: Xiangfeng Duan, Calvin Chow, David Heald, Chunming Niu, J. Parce, David Stumbo
  • Publication number: 20070190880
    Abstract: Porous nanofiber bearing substrate materials are provided having enhanced surface area for a variety of applications including as electrical substrates, semipermeable membranes and barriers, structural lattices for tissue culturing and for composite materials, and the like.
    Type: Application
    Filed: September 15, 2004
    Publication date: August 16, 2007
    Applicant: Nanosys, Inc.
    Inventors: Robert Dubrow, Chunming Niu
  • Publication number: 20070170414
    Abstract: The present invention relates to a field emission device comprising an anode and a cathode, wherein said cathode includes carbon nanotubes nanotubes which have been subjected to energy, plasma, chemical, or mechanical treatment. The present invention also relates to a field emission cathode comprising carbon nanotubes which have been subject to such treatment. A method for treating the carbon nanotubes and for creating a field emission cathode is also disclosed. A field emission display device containing carbon nanotube which have been subject to such treatment is further disclosed.
    Type: Application
    Filed: March 30, 2007
    Publication date: July 26, 2007
    Applicant: Hyperion Catalysis International, Inc.
    Inventors: Mikio Takai, Alan Fischer, Chunming Niu, Howard Tennent, Robert Hoch, Hans Biebuyck
  • Patent number: 7233041
    Abstract: A method and apparatus for an electronic substrate having a plurality of semiconductor devices is described. A thin film of nanowires is formed on a substrate. The thin film of nanowires is formed to have a sufficient density of nanowires to achieve an operational current level. A plurality of semiconductor regions are defined in the thin film of nanowires. Contacts are formed at the semiconductor device regions to thereby provide electrical connectivity to the plurality of semiconductor devices. Furthermore, various materials for fabricating nanowires, thin films including p-doped nanowires and n-doped nanowires, nanowire heterostructures, light emitting nanowire heterostructures, flow masks for positioning nanowires on substrates, nanowire spraying techniques for depositing nanowires, techniques for reducing or eliminating phonon scattering of electrons in nanowires, and techniques for reducing surface states in nanowires are described.
    Type: Grant
    Filed: July 21, 2006
    Date of Patent: June 19, 2007
    Assignee: Nanosys, Inc.
    Inventors: Xiangfeng Duan, Chunming Niu, Stephen A. Empedocles, Linda T. Romano, Jian Chen, Vijendra Sahi, Lawrence A. Bock, David P. Stumbo, Parce J. Wallace, Jay L. Goldman
  • Patent number: 7230149
    Abstract: Compositions including carbide-containing nanorods and/or oxycarbide-containing nanorods and/or carbon nanotubes bearing carbides and oxycarbides and methods of making the same are provided. Rigid porous structures including oxycarbide-containing nanorods and/or carbide containing nanorods and/or carbon nanotubes bearing carbides and oxycarbides and methods of making the same are also provided. The compositions and rigid porous structures of the invention can be used either as catalyst and/or catalyst supports in fluid phase catalytic chemical reactions. Processes for making supported catalyst for selected fluid phase catalytic reactions are also provided.
    Type: Grant
    Filed: September 14, 2004
    Date of Patent: June 12, 2007
    Assignee: Hyperion Catalysis International, Inc.
    Inventors: David Moy, Chunming Niu, Jun Ma, Jason M. Willey
  • Patent number: 7228050
    Abstract: This invention provides composite materials comprising nanostructures (e.g., nanowires, branched nanowires, nanotetrapods, nanocrystals, and nanoparticles). Methods and compositions for making such nanocomposites are also provided, as are articles comprising such composites. Waveguides and light concentrators comprising nanostructures (not necessarily as part of a nanocomposite) are additional features of the invention.
    Type: Grant
    Filed: January 26, 2006
    Date of Patent: June 5, 2007
    Assignee: Nanosys, Inc.
    Inventors: Mihai Buretea, Stephen Empedocles, Chunming Niu, Erik C. Scher
  • Publication number: 20070122101
    Abstract: This invention provides composite materials comprising nanostructures (e.g., nanowires, branched nanowires, nanotetrapods, nanocrystals, and nanoparticles). Methods and compositions for making such nanocomposites are also provided, as are articles comprising such composites. Waveguides and light concentrators comprising nanostructures (not necessarily as part of a nanocomposite) are additional features of the invention.
    Type: Application
    Filed: January 26, 2006
    Publication date: May 31, 2007
    Applicant: NANOSYS, Inc.
    Inventors: Mihai Buretea, Stephen Empedocles, Chunming Niu, Erik Scher
  • Publication number: 20070120167
    Abstract: A method and apparatus for an electronic substrate having a plurality of semiconductor devices is described. A thin film of nanowires is formed on a substrate. The thin film of nanowires is formed to have a sufficient density of nanowires to achieve an operational current level. A plurality of semiconductor regions are defined in the thin film of nanowires. Contacts are formed at the semiconductor device regions to thereby provide electrical connectivity to the plurality of semiconductor devices. Furthermore, various materials for fabricating nanowires, thin films including p-doped nanowires and n-doped nanowires, nanowire heterostructures, light emitting nanowire heterostructures, flow masks for positioning nanowires on substrates, nanowire spraying techniques for depositing nanowires, techniques for reducing or eliminating phonon scattering of electrons in nanowires, and techniques for reducing surface states in nanowires are described.
    Type: Application
    Filed: November 21, 2006
    Publication date: May 31, 2007
    Applicant: Nanosys, Inc.
    Inventors: Xiangfeng Duan, Chunming Niu, Stephen Empedocles, Linda Romano, Jian Chen, Vijendra Sahi, Lawrence Bock, David Stumbo, J. Parce, Jay Goldman
  • Patent number: 7179561
    Abstract: The present invention discloses nanowires for use in a fuel cell comprising a metal catalyst deposited on a surface of the nanowires. A membrane electrode assembly for a fuel cell is disclosed which generally comprises a proton exchange membrane, an anode electrode, and a cathode electrode, wherein at least one or more of the anode electrode and cathode electrode comprise an interconnected network of the catalyst supported nanowires. Methods are also disclosed for preparing a membrane electrode assembly and fuel cell based upon an interconnected network of nanowires.
    Type: Grant
    Filed: December 6, 2005
    Date of Patent: February 20, 2007
    Assignee: Nanosys, Inc.
    Inventors: Chunming Niu, Calvin Y. H. Chow, Stephen A. Empedocles, J. Wallace Parce
  • Publication number: 20070012980
    Abstract: A method and apparatus for an electronic substrate having a plurality of semiconductor devices is described. A thin film of nanowires is formed on a substrate. The thin film of nanowires is formed to have a sufficient density of nanowires to achieve an operational current level. A plurality of semiconductor regions are defined in the thin film of nanowires. Contacts are formed at the semiconductor device regions to thereby provide electrical connectivity to the plurality of semiconductor devices. Furthermore, various materials for fabricating nanowires, thin films including p-doped nanowires and n-doped nanowires, nanowire heterostructures, light emitting nanowire heterostructures, flow masks for positioning nanowires on substrates, nanowire spraying techniques for depositing nanowires, techniques for reducing or eliminating phonon scattering of electrons in nanowires, and techniques for reducing surface states in nanowires are described.
    Type: Application
    Filed: July 21, 2006
    Publication date: January 18, 2007
    Applicant: Nanosys, Inc.
    Inventors: Xiangfeng Duan, Chunming Niu, Stephen Empedocles, Linda Romano, Jian Chen, Vijendra Sahi, Lawrence Bock, David Stumbo, J. Parce, Jay Goldman
  • Patent number: 7164209
    Abstract: Methods of positioning and orienting nanostructures, and particularly nanowires, on surfaces for subsequent use or integration. The methods utilize mask based processes alone or in combination with flow based alignment of the nanostructures to provide oriented and positioned nanostructures on surfaces. Also provided are populations of positioned and/or oriented nanostructures, devices that include populations of positioned and/or oriented nanostructures, systems for positioning and/or orienting nanostructures, and related devices, systems and methods.
    Type: Grant
    Filed: December 1, 2004
    Date of Patent: January 16, 2007
    Assignee: Nanosys, Inc.
    Inventors: Xiangfeng Duan, R. Hugh Daniels, Chunming Niu, Vijendra Sahi, James M. Hamilton, Linda T. Romano
  • Patent number: 7151209
    Abstract: Nanostructure manufacturing methods and methods for assembling nanostructures into functional elements such as junctions, arrays and devices are provided. Systems for practicing the methods are also provided.
    Type: Grant
    Filed: May 31, 2005
    Date of Patent: December 19, 2006
    Assignee: Nanosys, Inc.
    Inventors: Stephen Empedocles, Larry Bock, Calvin Y. H. Chow, Xianfeng Duan, Chunming Niu, George Pontis, Vijendra Sahi, Linda T. Romano, David Stumbo
  • Publication number: 20060273328
    Abstract: Systems and methods to fabricate macroelectronic light emitting devices using densely oriented nanowires are disclosed. In one embodiment, core nanowires are synthesized and an insulating shell is fabricated around the nanowires. The nanowire core-shell structures are then deposited on a substrate to create a densely oriented nanowire thin film. Once the densely oriented nanowire thin film is created, a metal-insulator nanowire structure is fabricated by layering a metal on the nanowire thin film. Ohmic contacts are then created on the metal-insulator nanowire structure for operation. Application of electrical signals to the ohmic contacts causes light emission from the metal-insulator nanowire structure. Light emitting devices having densely oriented nanowire thin films are also disclosed. In an embodiment the light emitting device is, for example, a LED. The nanowires can include, for example, GaN, InP, CdS nanowires or a combination of these and other nanowires.
    Type: Application
    Filed: May 24, 2006
    Publication date: December 7, 2006
    Applicant: Nanosys, Inc.
    Inventors: Chunming Niu, Stephen Empedocles, David Zaziski