A5045960493- Semiconductor materials and devices
- Semiconductor Quantum Structures and Devices
- GaN-based semiconductor devices and materials
- Semiconductor materials and interfaces
- Metal and Thin Film Mechanics
- Copper Interconnects and Reliability
- Electronic and Structural Properties of Oxides
- Membrane Separation and Gas Transport
- Polymer Surface Interaction Studies
- Advanced Sensor and Energy Harvesting Materials
- Electrospun Nanofibers in Biomedical Applications
- Silicon and Solar Cell Technologies
- Synthesis and properties of polymers
- Membrane Separation Technologies
- Tribology and Wear Analysis
- Semiconductor Lasers and Optical Devices
- Advancements in Semiconductor Devices and Circuit Design
- Ga2O3 and related materials
- Fuel Cells and Related Materials
- Structural Behavior of Reinforced Concrete
- Thin-Film Transistor Technologies
- Engineering Structural Analysis Methods
- Wound Healing and Treatments
- Fiber-reinforced polymer composites
- Superconducting Materials and Applications
University of California, San Diego
2022-2023
Columbia University
2020-2022
Veracyte (United States)
2021
Yung Shin Pharmaceutical Industrial (Taiwan)
2013-2017
British Cycling
2017
EnerTech (United States)
2009-2010
Sharp Laboratories of Europe (United Kingdom)
2010
Chung Yuan Christian University
2000-2008
Hewlett-Packard (United States)
1997-2003
Trimble (United States)
1997-2002
A truncated-inverted-pyramid (TIP) chip geometry provides substantial improvement in light extraction efficiency over conventional AlGaInP/GaP chips of the same active junction area (∼0.25 mm2). The TIP decreases mean photon path-length within crystal, and thus reduces effects internal loss mechanisms. By combining this improved device with high-efficiency multiwell layers, record-level performance for visible-spectrum light-emitting diodes is achieved. Peak efficiencies exceeding 100 lm/W...
DNA nanotechnology has increasingly been used as a platform to scaffold enzymes based on its unmatched ability structure in desired format. The capability organize taken many forms from more traditional 2D pairings individual scaffolds recent works introducing enzyme organizations 3D lattices. As the define nanoscale grown, it is critical fully deconstruct impact of organization at single-scaffold level. Here, we present an open, three-dimensional (3D) wireframe octahedron which create...
Development of bioinert membranes to prevent blood clotting, tissue adhesion, and bacterial attachment is important for the wound healing process. In this work, two wound-contacting expanded poly(tetrafluoroethylene) (ePTFE) grafted with zwitterionic poly(sulfobetaine methacrylate) (PSBMA) hydrophilic poly(ethylene glycol) methacrylate (PEGMA) via atmospheric plasma-induced surface copolymerization were studied. The grafting chemical structure, hydrophilicity, hydration capability determined...
Herein, a pseudozwitterionic structure bearing moieties with mixed positive and negative charges is introduced to develop potential biomaterial for wound dressing applications. New mixed-charge matrices were prepared by copolymerization of the negatively charged 3-sulfopropyl methacrylate (SA) positively [2-(methacryloyloxy)ethyl] trimethylammonium (TMA) onto expanded polytetrafluoroethylene (ePTFE) membranes. The charge balance was effectively regulated through control initial SA/TMA ratio....
We have applied frequency-dependent capacitance measurements and admittance spectroscopy on GaN:Mg to study the electronic states associated with Mg doping. Metalorganic vapor phase epitaxy samples two different doping levels were grown thermally annealed in nitrogen. Lateral dot-and-ring Schottky diodes using Au/Ti fabricated. Frequency-dependent these show that is reduced at a higher frequency, most likely due inability of deep center maintain an equilibrium ionization state under...
The ability to coordinate and confine enzymes presents an opportunity affect their performance create chemically active materials. Recent studies show that polymers biopolymers can be used scaffold enzymes, lead the modulated biocatalytic efficiency. Here, we investigated role of microenvironments on enzyme activity using a well-defined molecular scaffold. An enzyme, glucose oxidase (GOx), was positioned at different locations three-dimensional (3D) octahedral DNA (OS), allowing enzyme's...
Expanded polytetrafluoroethylene (ePTFE) is one of the materials widely used in biomedical field, yet its application being limited by adverse reactions such as thrombosis when it comes contact with blood. Thus, a simple and robust way to modify ePTFE be biologically inert sought after. Modification without high-energy pretreatment, immersion coating, has been interest researchers for straightforward process ease scaling up. In this study, we utilized two-step coating zwitterionize...
Abstract Pilot plant experimental data were collected to study the feasibility of H 2 S removal from air streams utilizing aqueous solutions. Solutions NaOCl/NaOH tested in a packed bed scrubber and found be effective. An efficiency 99.2% was achieved at gas flow rate 790 lb/f ‐hr liquid‐gas ratio 5.06. Sodium hydroxide active ingredient absorption process. A minimum alkalinity pH 11 scrubbing solution required for efficiently absorbed scrubber. For rates up 2,100 hr, height transfer unit...
A new generation of compact and high-speed electronic devices, based on carbon, would be enabled through the development robust gate oxides with sub-nanometer effective oxide thickness (EOT) carbon nanotubes or graphene nanoribbons. However, to date, lack dangling bonds sp2 oriented sheets has limited high precursor nucleation density enabling atomic layer deposition sub-1 nm EOT oxides. It is shown here that by deploying a low-temperature AlOx (LT AlOx) process, involving (ALD) Al2O3 at 50...
Highly selective and smooth TiO2/Al2O3 HfO2/Al2O3 nanolaminates were deposited by water-free pulsed chemical vapor deposition (CVD) at 300 °C using titanium isopropoxide (Ti(OiPr)4) hafnium tertbutoxide (Hf(OtBu)4) with trimethylaluminum (TMA). TMA was found to be the key factor for enhancing nucleation selectivity on SiO2 or Si versus SiCOH (hydrophobic, nonporous low k dielectric). With precise dosing of TMA, achieved smoother films formed higher compared single precursor TiO2 HfO2 CVD....
The resistivity of halogen-free atomic layer deposition (ALD) TiN thin films was decreased to 220 μΩ cm by combining the use a high-thermal stability nonhalogenated Ti precursor with highly reactive nitrogen source, anhydrous hydrazine (N2H4). TDMAT [tetrakis (dimethyl-amino)titanium], TDEAT [tetrakis(diethylamido)titanium], and TEMATi (ethylmethyl-amido)titanium] were compared TiCl4 as precursors for ALD using N2H4 coreactant. By minimizing pulse length Ti-source optimizing temperature,...
Despite a set of properties ideal to the design wound dressings, bioinert membranes are seldom applied as wound-healing systems. This work presents unique series random copolymers glycidyl methacrylate (GMA) and poly(ethylene glycol) (PEGMA), namely GMA-r-PEGMA, used surface-modify by grafting onto method polytetrafluorethylene membranes, with aim developing dressings for quick efficient closure. It is shown that membrane modified G50P50 copolymer combines high surface hydrophilicity,...
Selective and smooth low-k SiOx/AlOx nanolaminate dielectric on (DOD) was achieved by a hybrid water-free pulsed CVD process consisting of 50 pulses ATSB (tris(2-butoxy)aluminum) at 330 °C 60 s TBS (tris(tert-butoxy)silanol) exposure 200 °C. Aniline selective passivation demonstrated W surfaces in preference to Si3N4 SiO2 300 At °C, exhibited no growth or SiO2, but its catalyzed AlOx. Using two-temperature process, ∼2.7 nm deposited aniline passivated W. Nanoselectivity confirmed nanoscale...
Surfaces of the expanded poly(tetrafluoroethylene) (ePTFE) sheets were chemically modified with assistance CO2 cold plasma generated by antenna coupling guided microwave. The pretreated ePTFE surface did not obviously change in terms morphology nodes structure but increased tension and promoted subsequent capability to graft polymerization acrylic acid (AAc). then characterized using FTIR-ATR X-ray photoelectron spectroscopy (XPS). Morphologies surfaces cross-sectioned side AAc-grafted...
Water-free inherent selective deposition of TiO2 on Si and SiO2 in preference to SiCOH has been studied via atomic layer (ALD) pulsed chemical vapor (CVD). is a nonreactive low-k dielectric material, consisting highly porous alkylated SiO2. was protect increase selectivity. The titanium precursor used all studies Ti(OiPr)4 [titanium(IV) isopropoxide] contains four oxygen atoms enabling it form through single-precursor CVD. At 250 °C substrate temperature, water-free ALD using either acetic...