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: 20110229795
    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: Application
    Filed: May 31, 2011
    Publication date: September 22, 2011
    Applicant: NANOSYS, INC.
    Inventors: Chunming Niu, Calvin Y.H. Chow, Stephen A. Empedocles, J. Wallace Parce
  • Publication number: 20110201984
    Abstract: This invention provides novel nanofiber enhanced surface area substrates and structures comprising such substrates for use in various medical devices, as well as methods and uses for such substrates and medical devices. In one particular embodiment, methods for enhancing cellular functions on a surface of a medical device implant are disclosed which generally comprise providing a medical device implant comprising a plurality of nanofibers (e.g., nanowires) thereon and exposing the medical device implant to cells such as osteoblasts.
    Type: Application
    Filed: April 28, 2011
    Publication date: August 18, 2011
    Applicant: NANOSYS, INC.
    Inventors: Robert S. Dubrow, Lawrence A. Bock, R. Hugh Daniels, Veeral D. Hardev, Chunming Niu, Vijendra Sahi
  • Patent number: 7998369
    Abstract: An electrically conductive composite comprising a polyvinylidene fluoride polymer or copolymer and carbon nanotubes is provided. Preferably, carbon nanotubes may be present in the range of about 0.5-20% by weight of the composite. The composites are prepared by dissolving the polymer in a first solvent to form a polymer solution and then adding the carbon nanotubes into the solution. The solution is mixed using an energy source such as a sonicator or a Waring blender. A precipitating component is added to precipitate out a composite comprising the polymer and the nanotubes. The composite is isolated by filtering the solution and drying the composite.
    Type: Grant
    Filed: August 20, 2007
    Date of Patent: August 16, 2011
    Assignee: Hyperion Catalysis International, Inc.
    Inventors: Chunming Niu, Lein Ngaw, Alan B. Fischer, Robert Hoch
  • Patent number: 7985454
    Abstract: The present invention is directed to compositions of matter, systems, and methods to manufacture nanowires. In an embodiment, a method to produce a catalytic-coated nanowire growth substrate for nanowire growth is disclosed which comprises: (a) depositing a buffer layer on a substrate; (b) treating the buffer layer with boiled water or steam to enhance interactions between the buffer layer and catalyst particles; and (c) depositing catalytic particles on a surface of the buffer layer. Methods to develop and use this catalytic-coated nanowire growth substrate are disclosed.
    Type: Grant
    Filed: September 23, 2008
    Date of Patent: July 26, 2011
    Assignee: Nanosys, Inc.
    Inventors: Chunming Niu, Jay L. Goldman, Xiangfeng Duan, Vijendra Sahi
  • Patent number: 7977007
    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: September 19, 2008
    Date of Patent: July 12, 2011
    Assignee: Nanosys, Inc.
    Inventors: Chunming Niu, Calvin Y. H. Chow, Stephen A. Empedocles, J. Wallace Parce
  • Patent number: 7977013
    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 20, 2006
    Date of Patent: July 12, 2011
    Assignee: Nanosys, Inc.
    Inventors: Chunming Niu, Calvin Y. H. Chow, Stephen A. Empedocles, J. Wallace Parce
  • Patent number: 7972616
    Abstract: This invention provides novel nanofiber enhanced surface area substrates and structures comprising such substrates for use in various medical devices, as well as methods and uses for such substrates and medical devices. In one particular embodiment, methods for enhancing cellular functions on a surface of a medical device implant are disclosed which generally comprise providing a medical device implant comprising a plurality of nanofibers (e.g., nanowires) thereon and exposing the medical device implant to cells such as osteoblasts.
    Type: Grant
    Filed: January 12, 2006
    Date of Patent: July 5, 2011
    Assignee: Nanosys, Inc.
    Inventors: Robert S. Dubrow, Lawrence A. Bock, R. Hugh Daniels, Veeral D. Hardev, Chunming Niu, Vijendra Sahi
  • Patent number: 7960904
    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: Grant
    Filed: March 30, 2007
    Date of Patent: June 14, 2011
    Assignee: Hyperion Catalysis International, Inc.
    Inventors: Mikio Takai, Alan B. Fischer, Chunming Niu, Howard G. Tennent, Robert Hoch, Hans Biebuyck
  • Patent number: 7951422
    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, as well as us of patterned substrates to grow oriented nanowires. 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: December 20, 2006
    Date of Patent: May 31, 2011
    Assignee: Nanosys, Inc.
    Inventors: Yaoling Pan, Xiangfeng Duan, Robert S. Dubrow, Jay Goldman, Shahriar Mostarshed, Chunming Niu, Linda T. Romano, David P. Stumbo, Alice Fischer-Colbrie, Vijendra Sahi, Virginia Robbins
  • Patent number: 7939218
    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: Grant
    Filed: November 20, 2006
    Date of Patent: May 10, 2011
    Assignee: Nanosys, Inc.
    Inventor: Chunming Niu
  • Patent number: 7932511
    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: March 1, 2007
    Date of Patent: April 26, 2011
    Assignee: Nanosys, Inc.
    Inventors: Xiangfeng Duan, Chunming Niu, Stephen Empedocles, Linda T. Romano, Jian Chen, Vijendra Sahi, Lawrence Bock, David Stumbo, J. Wallace Parce, Jay L. Goldman
  • Publication number: 20110039690
    Abstract: Porous and/or curved 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, production of long unbranched nanofibers, and the like. A method of producing nanofibers is disclosed including providing a plurality of microparticles or nanoparticles such as carbon black particles having a catalyst material deposited thereon, and synthesizing a plurality of nanofibers from the catalyst material on the microparticles or nanoparticles. Compositions including carbon black particles having nanowires deposited thereon are further disclosed.
    Type: Application
    Filed: August 29, 2006
    Publication date: February 17, 2011
    Applicant: Nanosys, Inc.
    Inventor: Chunming Niu
  • Patent number: 7880376
    Abstract: Field emission devices comprising carbon nanotube mats which have been treated with laser or plasma are provided. Mats are formed from carbon nanotubes, also known as carbon fibrils, which are vermicular carbon deposits having diameters of less than about one micron. The carbon nanotube mats are then subjected to laser or plasma treatment. The treated carbon nanotube mat results in improved field emission performance as either a field emission cathode or as part of a field emission device.
    Type: Grant
    Filed: August 20, 2007
    Date of Patent: February 1, 2011
    Assignee: Hyperion Catalysis International, Inc.
    Inventors: Mikio Takai, Alan Fischer, Lein Ngaw, Chunming Niu
  • Publication number: 20100323500
    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 includes 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: August 11, 2010
    Publication date: December 23, 2010
    Applicant: NANOSYS, INC.
    Inventors: Mihai Buretea, Jian Chen, Calvin Chow, Chunming Niu, Yaoling Pan, J. Wallace Parce, Linda T. Romano, David Stumbo
  • Patent number: 7851841
    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: June 8, 2007
    Date of Patent: December 14, 2010
    Assignee: Nanosys, Inc.
    Inventors: Xiangfeng Duan, Chunming Niu, Stephen A. Empedocles, Linda T. Romano, Jian Chen, Vijendra Sahi, Lawrence Bock, David P. Stumbo, J. Wallace Parce, Jay L. Goldman
  • Patent number: 7852613
    Abstract: The present invention relates to electroconductive inks and methods of making and using the same. The electroconductive inks include carbon fibrils and a liquid vehicle. The electroconductive ink may further include a polymeric binder. The electroconductive filler used is carbon fibrils which may be oxidized. The ink has rheological properties similar to that of commercially available electroconductive inks that use carbon black as their filler. The ink can be screen-printed, slot-coated, sprayed, brushed or dipped onto a wide variety of substrates to form an electroconductive coating.
    Type: Grant
    Filed: August 20, 2007
    Date of Patent: December 14, 2010
    Assignee: Hyperion Catalysis International, Inc.
    Inventors: Jun Ma, Alan Fischer, Chunming Niu, Lein Ngaw
  • Patent number: 7842432
    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: Grant
    Filed: June 12, 2007
    Date of Patent: November 30, 2010
    Assignee: Nanosys, Inc.
    Inventors: Chunming Niu, Baixin Qian, Ionel Stefan
  • Publication number: 20100285972
    Abstract: This invention provides novel nanofiber enhanced surface area substrates and structures comprising such substrates, as well as methods and uses for such substrates.
    Type: Application
    Filed: October 17, 2007
    Publication date: November 11, 2010
    Applicant: Nanosys, Inc.
    Inventors: Roberto Dubrow, Robert Hugh Daniels, J. Wallace Parce, Matthew Murphy, Jim Hamilton, Erik Scher, Dave Stumbo, Chunming Niu, Linda T. Romano, Jay Goldman, Vijendra Sahi, Jeffery A. Whiteford
  • Publication number: 20100279513
    Abstract: The present invention is directed to compositions of matter, systems, and methods to manufacture nanowires. In an embodiment, a buffer layer is placed on a nanowire growth substrate and catalytic nanoparticles are added to form a catalytic-coated nanowire growth substrate. Methods to develop and use this catalytic-coated nanowire growth substrate are disclosed. In a further aspect of the invention, in an embodiment a nanowire growth system using a foil roller to manufacture nanowires is provided.
    Type: Application
    Filed: September 23, 2008
    Publication date: November 4, 2010
    Applicant: NANOSYS, INC.
    Inventors: Chunming Niu, Jay L. Goldman, Xiangfeng Duan, Vijendra Sahi
  • Publication number: 20100261013
    Abstract: The present invention is directed to methods to harvest, integrate and exploit nanomaterials, and particularly elongated nanowire materials. The invention provides methods for harvesting nanowires that include selectively etching a sacrificial layer placed on a nanowire growth substrate to remove nanowires. The invention also provides methods for integrating nanowires into electronic devices that include placing an outer surface of a cylinder in contact with a fluid suspension of nanowires and rolling the nanowire coated cylinder to deposit nanowires onto a surface. Methods are also provided to deposit nanowires using an ink-jet printer or an aperture to align nanowires. Additional aspects of the invention provide methods for preventing gate shorts in nanowire based transistors. Additional methods for harvesting and integrating nanowires are provided.
    Type: Application
    Filed: June 22, 2010
    Publication date: October 14, 2010
    Applicant: NANOSYS, INC.
    Inventors: Xiangfeng Duan, Chunming Niu, Stephen A. Empedocles, David P. Stumbo