A5056697599- Metal and Thin Film Mechanics
- Diamond and Carbon-based Materials Research
- Semiconductor materials and devices
- Boron and Carbon Nanomaterials Research
- Gas Sensing Nanomaterials and Sensors
- Analytical Chemistry and Sensors
- Force Microscopy Techniques and Applications
- Transition Metal Oxide Nanomaterials
- Advanced Surface Polishing Techniques
- Hydrogen Storage and Materials
- Advanced Chemical Sensor Technologies
- ZnO doping and properties
- GaN-based semiconductor devices and materials
- Acoustic Wave Resonator Technologies
- Ammonia Synthesis and Nitrogen Reduction
- Semiconductor materials and interfaces
- Advanced ceramic materials synthesis
- Electronic and Structural Properties of Oxides
- Advanced Memory and Neural Computing
- Thin-Film Transistor Technologies
- Ferroelectric and Piezoelectric Materials
- Advanced materials and composites
- Silicon Nanostructures and Photoluminescence
- Inorganic Chemistry and Materials
- Thermography and Photoacoustic Techniques
Hong Kong Polytechnic University
2008-2021
Chinese University of Hong Kong
1989-1991
Carbon nitride (CNx) films were prepared by reactive pulsed laser deposition at nitrogen partial pressure PN2varying from 0 to 300 mTorr. It is found that the atomic fraction of f in first increases with increasing PN2, reaches a maximum 0.32 PN2=100 mTorr, and then decreases saturated value 0.26 PN2≳200 Because absence energetic particles deposition, limited content cannot be attributed preferential sputtering generally observed particle-assisted CNx films. Infrared absorption experiments...
Although an increasing volume of x-ray photoemission spectroscopic (XPS) data has been accumulated on boron and boron-rich compounds because their unusual properties, including a unique three-center, two-electron bonding configuration, common nonmetallic nature overlooked. Typically, the measured energy-state are not clarified by surface Fermi level positions these samples, which compromises scientific contents data. In present study, we revisited XPS studies sputter-cleaned β-rhombohedral...
The palladium nanoparticle (Pd NP)-decorated LaAlO3/SrTiO3 (LAO/STO) heterostructure is for the first time used as a hydrogen-gas sensor with very high sensitivity and workability at room temperature. outstanding gas-sensing properties are due to Pd NPs' catalytic effect different gases, resulting in charge coupling between gas molecules two-dimensional electron (2DEG) through NPs by either direct exchange or change of affinity. These results provide insight into emerging LAO/STO interfaces....
Hydrogen- (H2-) induced resistive response of palladium (Pd) coated tungsten oxide (WO3) films prepared by using supersonic cluster beam deposition (SCBD) was investigated. An SCBD WO3 film is found to be constructed nanoclusters diameters 3–5 nm. The are loosely connected form a structure high porosity around 66%. With this structure, the exhibits many excellent room-temperature H2 sensing properties, including sensitivity, broad detectable range concentration, low detection limit, fast...
This article presents a methodology for evaluating the yield strength and hardening behavior of metallic materials by spherical indentation. Two types assumed material behaviors with pure elastic-Hollomon’s power law elastic-linear were considered separately in models The numerical relationships between properties indentation responses established on basis dimensional finite element analysis. As first approximation to real plastic flow properties, strengths determined from loading curve used...
Palladium (Pd) film containing nanogaps of well controlled dimension was fabricated on a Si wafer having high-aspect-ratio micropillar. The Pd arranged to experience hydrogen (H2)-induced volume expansion. (i) If the nanogap is kept open, its width narrowed down. A discharge current generated give strong, fast, and repeatable on-off type resistive switching response. (ii) closed, cross section conduction path varies continuous H2-concentration dependent influence stresses related physical...
Design of a system used for characterizing gas sensing materials is described. It distinctive being able to measure electrical and optical responses sample simultaneously, control number measurement parameters, perform fast exchange gaseous environment, be fully controlled automatically. These features make the versatile in determining most concerned performance indexes material (e.g., sensitivity, stability, selectivity, response/recovery times, etc.) as functions various combinations...