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
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.
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.
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
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
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
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.
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
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
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
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.
Abstract: An apparatus for drug delivery is presented in accordance with aspects of the present disclosure. The apparatus includes a laser-driven photoacoustic microfluid pump (LDMP), an open tube capillary including a first end and a second end; the first end disposed on the LDMP, the open tube capillary configured to store a drug. The LDMP is configured to generate a fluidic jet from the drug and deliver the drug.
Type:
Application
Filed:
May 20, 2020
Publication date:
July 14, 2022
Inventors:
Jiming Bao, Wei-Kan Chu, Feng Lin, Shuai Yue, Di Chen, Dennis McWilliams
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.
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
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
Abstract: An apparatus for controlling a cylinder by a microfluidic stream includes a microtube, a first laser-driven photoacoustic microfluid pump (LDMP), and a fiber optic element. The microtube includes a fluid and a cylinder. The fiber optic element includes a first end and a second end. The first end is disposed on the first LDMP and the second end is disposed in a first end portion of the microtube. The first LDMP is configured to generate a directional fluidic jet from the fluid and to push the cylinder in a direction away from the second end of the fiber optic element.
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
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
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