A5072828969- Ion-surface interactions and analysis
- Integrated Circuits and Semiconductor Failure Analysis
- Silicon Nanostructures and Photoluminescence
- Electronic and Structural Properties of Oxides
- Crystallography and Radiation Phenomena
- Semiconductor materials and devices
- Electron and X-Ray Spectroscopy Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Nanowire Synthesis and Applications
- Magnetic and transport properties of perovskites and related materials
- Advanced Electron Microscopy Techniques and Applications
- Advanced X-ray Imaging Techniques
- Photonic and Optical Devices
- Photonic Crystals and Applications
- 2D Materials and Applications
- Advanced Condensed Matter Physics
- ZnO doping and properties
- Nuclear Physics and Applications
- Thin-Film Transistor Technologies
- Perovskite Materials and Applications
- Physics of Superconductivity and Magnetism
- Graphene research and applications
- Advanced Photocatalysis Techniques
- Ga2O3 and related materials
- Spectroscopy Techniques in Biomedical and Chemical Research
National University of Singapore
2016-2025
Shanghai University
2022
University of Oklahoma
2022
Institute of Materials Research and Engineering
2012
Ion Beam Applications (France)
2005
University of Surrey
1998-2003
University of Lisbon
1997-1998
University of the Witwatersrand
1997
University of Oxford
1991-1997
Sandia National Laboratories
1997
Molybdenum disulphide, a diamagnetic layered dichalcogenide solid, is found to show magnetic ordering at room temperature when exposed 2 MeV proton beam. The dependence of magnetization displays ferrimagnetic behavior with Curie 895 K. A disorder mode corresponding zone-edge phonon and Mo valence higher than +4, have been detected in the irradiated samples using Raman X-ray photoelectron spectroscopy, respectively. possible origins long-range MoS2 are discussed.
A wireless sensor based on bioresponsive DNA hydrogel provides smartphone-based detection of wound infection.
The realization of long-range magnetic ordering in 2D systems can potentially revolutionize next-generation information technology. Here, the successful fabrication crystalline Cr3 Te4 monolayers with room temperature (RT) ferromagnetism is reported. Using molecular beam epitaxy, growth films monolayer thickness demonstrated at low substrate temperatures (≈100 °C), compatible Si complementary metal oxide semiconductor X-ray circular dichroism measurements reveal a Curie (Tc ) v344 K for an...
Proton beam (p-beam) writing is a new direct-writing process that uses focused of MeV protons to pattern resist material at nanodimensions. The process, although similar in many ways direct using electrons, nevertheless offers some interesting and unique advantages. Protons, being more massive, have deeper penetration materials while maintaining straight path, enabling p-beam fabricate three-dimensional, high aspect ratio structures with vertical, smooth sidewalls low line-edge roughness....
Spoof plasmon surfaces consisting of linear arrays subwavelength grooves are proposed as a novel platform for THz sensing. The tightly confined spoof plasmons, coupled via an Otto prism setup, sensitive to the refractive index dielectric filling grooves. Phase jumps at resonances used readout response An overall sensitivity 0.49 RIU−1 with figures-of-merit high 49 achieved.
A new X-ray absorption fine-structure (XAFS) spectroscopy beamline for fundamental and applied catalysis research, called XAFCA, has been built by the Institute of Chemical Engineering Sciences, Singapore Synchrotron Light Source. XAFCA covers photon energy range from 1.2 to 12.8 keV, making use two sets monochromator crystals, an Si (111) crystal 2.1 keV a KTiOPO4 [KTP (011)] between 2.8 keV. Experiments can be carried out in temperature 4.2 1000 K pressures up 30 bar research. safety...
High-performance piezoelectric materials are critical components for electromechanical sensors and actuators. For more than 60 years, the main strategy obtaining large response has been to construct multiphase boundaries, where nanoscale domains with local structural polar heterogeneity formed, by tuning complex chemical compositions. We used a different emulate such forming nanopillar regions in perovskite oxide thin films. obtained giant effective coefficient [Formula: see text] of ~1098...
Abstract The intense light–matter interaction of plasmonic metasurfaces provides an appealing platform for optical sensing. To date, most metasurface sensors are not spectrally tuned. Moreover, they operate in a total reflection mode, which complicates the setup. Transmissive tunable filters therefore desirable. A mid‐infrared (M‐IR) is described that operates transmission mode. resonant frequency filter tuned by nonvolatile phase transitions to dielectric properties chalcogenide material Ge...
In this paper, we show that broadband spectral data can be experimentally extracted from corrugated metallic surfaces consisting of a linear array subwavelength grooves supporting tightly confined spoof plasmons. Using combination the scattering edge coupling method and short-time Fourier transform, are able to discern group velocity characteristics plasmon pulse, which in turn allows for extraction dispersion 0.4 1.44 THz single measurement. Refractive index sensing various fluids is...
There have been several recent conflicting reports on the ferromagnetism of clean monolayer VSe2 . Herein, controllable formation 1D defect line patterns in vanadium diselenide (VSe2 ) monolayers initiated by thermal annealing is presented. Using scanning tunneling microscopy and q-plus atomic force techniques, features are determined to be 8-member-ring arrays, formed via a Se deficient reconstruction process. The reconstructed with Se-deficient defects displays room-temperature under X-ray...
Abstract Mesoporous carbon nitrides with C 3 N 5 and 6 stoichiometries created a new momentum in the field of organic metal‐free semiconductors owing to their unique band structures high basicity. Here, we report on preparation novel graphitic microporous nitride tetrazine based chemical structure composition 5.4 using ultra‐stable Y zeolite as template aminoguanidine hydrochloride, nitrogen‐containing molecule, CN precursor. Spectroscopic characterization density functional theory...
Porous boron carbon nitride (BCN) is one of the exciting systems with unique electrochemical and adsorption properties. However, synthesis low-cost porous BCN tunable porosity challenging, limiting its full potential in a variety applications. Herein, preparation well-defined mesoporous (MBCN) high specific surface area, pores, nitrogen contents demonstrated through simple integration chemical polymerization readily available sucrose borane ammonia complex (BAC) nano-hard-templating...
Biomass-derived nanoporous carbons (BNCs) are attractive materials for CO2 capture and energy storage due to their unique surface properties the availability of low-cost abundant supply carbon sources. However, order atoms, nature porosity functional groups critical in dictating performance BNCs such applications. Herein, a solid-phase activation strategy is introduced prepare O-functionalized with embedded graphene-like structures using d(+)-glucose as precursor. The optimised material...
Abstract Hybrid ion capacitors (HIC) are receiving a lot of attention due to their potential achieve high energy and power densities, but they remain insufficient. It is imperative explore outstanding environmentally benign electrode materials high‐performing HIC systems. Here, unique boron carbon nitride (BCN)‐based system that comprises microporous BCN structure Fe 1−x S nanoparticle incorporated nanosheets ( BNF ) as cathode anode, respectively reported. The prepared through facile...
Topotactic reduction utilizing metal hydrides as reagents has emerged an effective approach to achieve exceptionally low oxidization states of ions and unconventional coordination networks. This method opens avenues the development entirely new functional materials, with one notable example being infinite-layer nickelate superconductors. However, effect on atomic reconstruction electronic structures-crucial for superconductivity-remains largely unresolved. We designed two sets control...
In the pursuit of sustainable and clean energy sources, development efficient electrocatalysts for hydrogen evolution reaction has gained significant attention. this work, we synthesized single-atom Fe-doped 1T MoS2 (sFe-1T/MoS2) nanosheets using a one-step hydrothermal method, harnessing synergistic effects iron-intercalation to enhance production through an abundance active sites. Notably, 10 at. % sFe-1T/MoS2 exhibited excellent performance with low onset potential 190 mV Tafel slope 55...
Transition metal carbides, known as MXenes, particularly Ti3C2Tx, have been extensively explored promising materials for electrochemical reactions. However, transition carbonitride MXenes with high nitrogen content reactions are rarely reported. In this work, incorporated Pt-based electrocatalysts, ranging from single atoms to sub-nanometer dimensions, hydrogen evolution reaction (HER). The fabricated Pt clusters/MXene catalyst exhibits superior HER performance compared the...