Search Patents
  • Publication number: 20100252805
    Abstract: A method of preparing nanorod arrays using ion beam implantation is described that includes defining a pattern on a substrate and then implanting ions into the substrate using ion beam implantation. Next, a thin film is deposited on the substrate. During film growth, nanotrenches form and catalyze the formation of nanorods through capillary condensation. The resulting nanorods are aligned with the supporting matrix and are free from lattice and thermal strain effect. The density, size, and aspect ratios of the nanorods can be varied by changing the ion beam implantation and thin film growth conditions resulting in control of emission efficiency.
    Type: Application
    Filed: June 29, 2006
    Publication date: October 7, 2010
    Applicant: UNIVERSITY OF HOUSTON
    Inventors: Wei-Kan Chu, Hye-Won Seo, Quark Y. Chen, Li-Wei Tu, Ching-Lien Hsaio, Xuemei Wang, Yen-Jie Tu
  • Patent number: 4408254
    Abstract: A capacitor is formed by placing between two electodes a thin film of amorphous titanate which has been ion implanted with noble gas ions.
    Type: Grant
    Filed: November 18, 1981
    Date of Patent: October 4, 1983
    Assignee: International Business Machines Corporation
    Inventors: Wei-Kan Chu, James K. Howard
  • Publication number: 20100193685
    Abstract: This miniature neutron generator is for active detection of highly enriched uranium using a movable detection system. It is a small size, lightweight, low power consumption neutron generator with ease of operation and maintenance. The detector is based on a simplified ion source and ion transport system.
    Type: Application
    Filed: June 29, 2006
    Publication date: August 5, 2010
    Applicant: UNIVERSITY OF HOUSTON
    Inventors: Wei-kan Chu, Jiarui Liu
  • Patent number: 7622372
    Abstract: Vacancies and dopant ions are introduced near the surface of a semiconductor layer structure. Implanted dopant ions which diffuse by an interstitialcy mechanism have diffusivity greatly reduced, which leads to a very low resistivity doped region and a very shallow junction.
    Type: Grant
    Filed: September 11, 2006
    Date of Patent: November 24, 2009
    Inventors: Wei-Kan Chu, Lin Shao
  • Publication number: 20160274031
    Abstract: Methods for fabricating metal nano-particle embedded enhancement substrates used for surface enhanced Raman spectroscopy (SERS) including ion implanting metal nano-particles into the substrate and etching the substrate to partially expose the metal nano-particles. The resulting material is useful as a SERS substrate for detection of molecules adsorbed on it by surface enhanced Raman spectroscopy.
    Type: Application
    Filed: March 16, 2016
    Publication date: September 22, 2016
    Applicant: THE UNIVERSITY OF HOUSTON SYSTEM
    Inventors: Wei-Kan Chu, Dharshana N. Wijesundera, Indrajith Rajapaksa
  • Patent number: 7105427
    Abstract: Vacancies and dopant ions are introduced near the surface of a semiconductor wafer. The dopant ions which diffuse by an interstitialcy mechanism have diffusivity greatly reduced, which leads to a very low resistivity doped region and a very shallow junction.
    Type: Grant
    Filed: August 30, 2004
    Date of Patent: September 12, 2006
    Inventors: Wei-Kan Chu, Lin Shao, Xinming Lu, Jiarui Liu, Xuemei Wang
  • Publication number: 20100301196
    Abstract: A portable and/or mobile detector for highly enriched uranium (HEU) and weapon grade plutonium (WGPu) is disclosed the detects HEU and/or WGPu based on neutron induced fission of a portion of the HEU and/or WGPu and detecting delayed neutron and/or ?-rays emission from delayed neutron emitters formed from the induced fission reactions.
    Type: Application
    Filed: May 2, 2008
    Publication date: December 2, 2010
    Inventors: Wei-Kan Chu, Jia-Rui Liu
  • Patent number: 9326687
    Abstract: Methods for fabricating metal nano-particle embedded enhancement substrates used for surface enhanced Raman spectroscopy (SERS) including ion implanting metal nano-particles into the substrate and etching the substrate to partially expose the metal nano-particles. The resulting material is useful as a SERS substrate for detection of molecules adsorbed on it by surface enhanced Raman spectroscopy.
    Type: Grant
    Filed: August 5, 2013
    Date of Patent: May 3, 2016
    Inventors: Wei-Kan Chu, Dharshana N Wijesundera, Indrajith Rajapaksa
  • Publication number: 20140081150
    Abstract: Methods for fabricating metal nano-particle embedded enhancement substrates used for surface enhanced Raman spectroscopy (SERS) including ion implanting metal nano-particles into the substrate and etching the substrate to partially expose the metal nano-particles. The resulting material is useful as a SERS substrate for detection of molecules adsorbed on it by surface enhanced Raman spectroscopy.
    Type: Application
    Filed: August 5, 2013
    Publication date: March 20, 2014
    Applicant: THE UNIVERSITY OF HOUSTON SYSTEM
    Inventors: Wei-Kan Chu, Dharshana N. Wijesundera, Indrajith Rajapaksa
  • Patent number: 6493411
    Abstract: Thermal neutron irradiation of superconducting body compositions into which Li or B has been incorporated as a unit cell external or internal dopant introduces by the nuclear reaction of the dopant pinning centers which substantially improve the critical current density of the body.
    Type: Grant
    Filed: October 1, 1996
    Date of Patent: December 10, 2002
    Assignee: University of Houston-University Park
    Inventors: Wei-Kan Chu, Jiarui Liu
  • Patent number: 6812523
    Abstract: Vacancies and dopant ions are introduced near the surface of a semiconductor wafer. The dopant ions which diffuse by an interstitialcy mechanism have diffusivity greatly reduced, which leads to a very low resistivity doped region and a very shallow junction.
    Type: Grant
    Filed: September 9, 2002
    Date of Patent: November 2, 2004
    Inventors: Wei-Kan Chu, Lin Shao, Xinming Lu, Jiarui Liu, Xuemei Wang
  • Publication number: 20020006877
    Abstract: Planarizing High Temperature Superconductor (HTS) surfaces, especially HTS thin film surfaces is crucial for HTS thin film device processing. Disclosed is a method of surface planarization for HTS film. The method includes first smoothing the HTS surface by Gas Cluster Ion Beam bombardment, followed by annealing in partial pressure of oxygen to regrow the damaged surface layer. A rough HTS surface can be planarized down to a smoothness with a standard deviation of one nanometer or better.
    Type: Application
    Filed: June 25, 2001
    Publication date: January 17, 2002
    Applicant: Epion Corporation
    Inventors: Wei-Kan Chu, Judy Z. Wu
  • Patent number: 5542506
    Abstract: Disclosed are devices for influencing and/or controlling relative motion between members, such as vibration damping or absorbing devices, clutches and brakes. The devices comprise a magnet on one member and a field cooled superconductor on the other member. The devices utilize the interaction of the magnetic field of the magnet as it moves through the pinned flux in the superconductor to either influence or control relative motion.
    Type: Grant
    Filed: December 3, 1991
    Date of Patent: August 6, 1996
    Assignee: University of Houston-University Park
    Inventors: Chase K. McMichael, Ki-Bui Ma, Wei-Kan Chu
  • Patent number: 5947237
    Abstract: Disclosed are devices for influencing and/or controlling relative motion between members, such as vibration damping or absorbing devices, clutches and brakes. The devices comprise a magnet on one member and a field cooled superconductor on the other member. The devices utilize the interaction of the magnetic field of the magnet as it moves through the pinned flux in the superconductor to either influence or control relative motion.
    Type: Grant
    Filed: August 29, 1995
    Date of Patent: September 7, 1999
    Assignee: University of Houston - University Park
    Inventors: Chase K. McMichael, Ki-Bui Ma, Wei-Kan Chu
  • Patent number: 4544576
    Abstract: Deep dielectric isolation zones in a substrate are achieved by forming trenches using reactive ion etching. A glass having a coefficient of thermal expansion closely matching that of the substrate is deposited onto the trench to entirely or partially fill the trench. Deposition can be by sedimentation, centrifugation or spin-on techniques. The structure is then fired until the glass particles fuse into a continuous glass layer and final smoothing if necessary can be accomplished.
    Type: Grant
    Filed: July 27, 1981
    Date of Patent: October 1, 1985
    Assignee: International Business Machines Corporation
    Inventors: Wei-Kan Chu, William A. Pliskin, Jacob Riseman
  • Publication number: 20180015439
    Abstract: Titania nanotube arrays are useful for phosphopeptide enrichment and separation. These highly ordered titania nanotube arrays are a low cost and highly effective alternative to the use of liquid chromatography mass spectrometry (LC-MS) methods using meoporous titania beads or particles. The highly ordered Ti02 nanotubes are grown on surfaces coated with Ti metal, or preferably on Ti wires, by methods that preferably include anodic oxidation.
    Type: Application
    Filed: December 15, 2015
    Publication date: January 18, 2018
    Inventors: Oomman K. Varghese, Aruna Wijeratne, Maggie Paulose, Ivy Ahiabu, Kenneth D. Greis, Dharshana Wijesundara, Wei-Kan Chu
  • Patent number: 5159219
    Abstract: A superconductor-magnet system having high thrust and stability, with a method for increasing the thrust and stability of such a system, comprises a first magnet, a second magnet and a superconductor. The magnets are in motion relative to each other and the superconductor is in motion relative to one and stationary relative to the other magnet. High thrust and stability can be achieved by increasing the magnetic field of the magnet in motion relative to the superconductor. Also disclosed are magnetic thrust and journal bearings utilizing the above system.
    Type: Grant
    Filed: May 16, 1991
    Date of Patent: October 27, 1992
    Assignee: University of Houston-University Park
    Inventors: Wei-Kan Chu, Ki-Bui Ma, Chase K. McMichael
  • Patent number: 10478800
    Abstract: Titania nanotube arrays are useful for phosphopeptide enrichment and separation. These highly ordered titania nanotube arrays are a low cost and highly effective alternative to the use of liquid chromatography mass spectrometry (LC-MS) methods using meoporous titania beads or particles. The highly ordered TiO2 nanotubes are grown on surfaces coated with Ti metal, or preferably on Ti wires, by methods that preferably include anodic oxidation.
    Type: Grant
    Filed: December 15, 2015
    Date of Patent: November 19, 2019
    Assignee: UNIVERSITY OF HOUSTON SYSTEM
    Inventors: Oomman K. Varghese, Aruna Wijeratne, Maggie Paulose, Ivy Ahiabu, Kenneth D. Greis, Dharshana Wijesundara, Wei-Kan Chu
  • Patent number: 6251835
    Abstract: Planarizing High Temperature Superconductor (HTS) surfaces, especially HTS thin film surfaces is crucial for HTS thin film device processing. Disclosed is a method of surface planarization for HTS film. The method includes first smoothing the HTS surface by Gas Cluster Ion Beam bombardment, followed by annealing in partial pressure of oxygen to regrow the damaged surface layer. A rough HTS surface can be planarized down to a smoothness with a standard deviation of one nanometer or better.
    Type: Grant
    Filed: May 6, 1998
    Date of Patent: June 26, 2001
    Assignee: Epion Corporation
    Inventors: Wei-Kan Chu, Judy Z. Wu
  • Patent number: 5726512
    Abstract: An isolation system for isolating a first object from vibrations from a second object. Such vibrations will have three orthogonal components, one oriented along a line between the objects, and two oriented 90.degree. apart in a plane normal to that line. The system includes three superconductor/magnet stages, each stage designed to extinguish one of the orthogonal components.
    Type: Grant
    Filed: October 4, 1996
    Date of Patent: March 10, 1998
    Assignee: The University of Houston System
    Inventors: Wei-Kan Chu, Quark Yung-Sung Chen, Ki-Bui Ma, Mark Alan Lamb, Chase Kenyon McMichael, Ignatius S. T. Tsong
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