A5100733577- Graphene research and applications
- ZnO doping and properties
- Nanowire Synthesis and Applications
- MXene and MAX Phase Materials
- 2D Materials and Applications
- Boron and Carbon Nanomaterials Research
- Electron and X-Ray Spectroscopy Techniques
- Quantum Dots Synthesis And Properties
- Supercapacitor Materials and Fabrication
- Silicon Nanostructures and Photoluminescence
- Copper-based nanomaterials and applications
- Ga2O3 and related materials
- Advancements in Battery Materials
- Ion-surface interactions and analysis
- Advanced Surface Polishing Techniques
- Gas Sensing Nanomaterials and Sensors
- Advanced Memory and Neural Computing
- Integrated Circuits and Semiconductor Failure Analysis
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Ferroelectric and Negative Capacitance Devices
- Plasmonic and Surface Plasmon Research
- Advanced machining processes and optimization
- Diamond and Carbon-based Materials Research
- Advanced Electron Microscopy Techniques and Applications
Trinity College Dublin
2015-2024
Advanced Materials and BioEngineering Research
2014-2024
Beihang University
2009-2023
Guilin University of Electronic Technology
2014-2023
Northeast Agricultural University
2022
State Grid Corporation of China (China)
2022
Shanghai Jiao Tong University
2010-2021
Tianjin Normal University
2018
Commercial Aircraft Corporation of China (China)
2013-2016
22q11 Ireland
2014-2015
Employing high-yield production of layered materials by liquid-phase exfoliation, molybdenum disulfide (MoS2) dispersions with large populations single and few layers were prepared. Electron microscopy verified the high quality two-dimensional MoS2 nanostructures. Atomic force analysis revealed that ~39% flakes had thicknesses less than 5 nm. Linewidth frequency difference E(1)2g A1g Raman modes confirmed effective reduction flake from bulk to dispersions. Ultrafast nonlinear optical (NLO)...
We report large-scale synthesis of silica nanowires (SiONWs) using an excimer laser ablation method. Silica was produced in the form amorphous at a diameter ∼15 nm and length up to hundreds micrometers. The SiONWs emit stable high brightness blue light energies 2.65 3.0 eV. intensity emission is two orders magnitude higher than that porous silicon. may have potential applications high-resolution optical heads scanning near-field microscope or nanointerconnections future integrated devices.
Well-aligned arrays of ZnO nanoneedles were fabricated using a simple vapor phase growth. The diameters the nanoneedle tips are as small several nanometers, which is highly in favor field emission. Field-emission measurements cathode showed emission current density high 2.4 mA/cm2 under 7 V/μm, and very low turn-on V/μm. Such attributed to aspect ratio nanoneedles. density, stability, make one promising candidates for field-emission displays.
Mechanical cleavage by Scotch tape was the first method to produce graphene and is still widely used in laboratories. However, a critical problem of this extremely low yield. We have tailored ball milling conditions gentle shear forces that high quality boron nitride (BN) nanosheets yield efficiency. The in-plane structure BN has not been damaged as shown near edge X-ray absorption fine measurements. benzyl benzoate acts agent reduce impacts contamination. This applicable any layered...
Ultrafast-response (20 μs) UV detectors, which are visible-blind and self-powered, in devices where an n-type ZnO nanowire partially lies on a p-type GaN film, demonstrated. Moreover, CdSe-nanowire red-light detector powered by nanoscale ZnO/GaN photovoltaic cell is also demonstrated, extends the device function to selective multiwavelength photodetector shows of optical logical AND gate. Detailed facts importance specialist readers published as "Supporting Information". Such documents...
We report subnanometer modification enabled by an ultrafine helium ion beam. By adjusting dose and the beam profile, structural defects were controllably introduced in a few-layer molybdenum disulfide (MoS2) sample its stoichiometry was modified preferential sputtering of sulfur at few-nanometer scale. Localized tuning resistivity MoS2 demonstrated semiconducting, metallic-like, or insulating material obtained irradiation with different doses He+. Amorphous MoSx metallic behavior has been...
Ternary cobalt nickel sulfide as a novel and efficient electrode material in supercapacitors has recently gained extensive interests. Herein, we first report highly conductive caterpillar-like NiCo2S4, composed of NiCo2S4 nanosheet core nanowire shell grown on Ni foam via facile cost-effective chemical liquid process. Growth mechanism the nanosheets@nanowires (NSNWs) structure was also investigated detail by analyzing time-dependent experimental well amount additive ammonium fluoride...
We report the large-scale synthesis of silicon nanowires (SiNWs) using a simple but effective approach. High purity SiNWs uniform diameters around 15 nm were obtained by sublimating hot-pressed powder target at 1200 °C in flowing carrier gas environment. The emit stable blue light which seems unrelated to quantum confinement, related an amorphous overcoating layer oxide. Our approach can be used, principle, as general method for other one-dimensional semiconducting, or conducting nanowires.
Raman-scattering spectra of silicon nanowires (SiNW's) with different diameters were obtained at room temperature. The Raman peaks SiNW's found to shift and broaden decreasing diameter the SiNW's. In addition fundamental phonon modes, overtone combination modes also observed identified according selection rules bands. A confinement model was used explain experimental results modes. show that effect becomes more obvious when SiNW is less than 22 nm. present should be benefit applications
The field-emission properties of ordered ZnO nanorod arrays with different morphologies were investigated in detail. After comparison three morphologies, it was found that the morphology nanorods has considerable effect on their field emission properties, especially turn-on and current density. Among them, nanoneedle have lowest field, highest density, largest efficiency, which is ascribed to small emitter radius nanoscale. On other hand, high density remarkably reduces local at emitters...
Liquid-phase-exfoliation technology was utilized to prepare layered MoS2, WS2, and MoSe2 nanosheets in cyclohexylpyrrolidone. The nonlinear optical response of these dispersions investigated by observing spatial self-phase modulation (SSPM) using a 488 nm continuous wave laser beam. diffraction ring patterns SSPM were found be distorted along the vertical direction right after traversing nanosheet dispersions. refractive index three transition metal dichalcogenides n2 measured...
A MoO3–carbon nanocomposite was synthesized from a mixture of MoO3 and graphite by controlled ball milling procedure. The as-prepared product consists nanosized particles (2–180 nm) homogeneously distributed in carbon matrix. acts as high capacity anode material for lithium-ion batteries exhibits good cyclic behavior. Its initial exceeds the theoretical 745 mA h g−1 (1 : 1 weight), stable 700 (94% capacity) is still retained after 120 cycles. electrode performance linked with unique...
Two-dimensional (2D) layered semiconductors have recently emerged as attractive building blocks for next-generation low-power nonvolatile memories. However, challenges remain in the controllable fabrication of bipolar resistive switching circuit components from these materials. Here, experimental realization lateral memtransistors monolayer single-crystal molybdenum disulfide (MoS2) utilizing a focused helium ion beam is reported. Site-specific irradiation with probe microscope creates...
Time-controlled plasma treatment of MoS 2 FETs improves carrier transport due to the presence a two-dimensional oxide phase.
The development of novel oral drug delivery systems is an expanding area research and both new approaches for improving their efficacy the investigation potential toxicological effect are crucial should be performed in parallel. Polystyrene nanoparticles (NPs) have been used production diagnostic therapeutic nanosystems, widely food packaging, also served as models investigating NPs interactions with biological systems. mucous gel layer that covers epithelium gastrointestinal system a...
Elementary tellurium is currently of great interest as an element with potential promise in nano-technology applications because the recent discovery regarding its three two-dimensional phases and existence Weyl nodes around Femi level. Here, we report on unique nano-photonic properties elemental particles [Te(0)], harvest from a culture tellurium-oxyanion respiring bacteria. The bacterially-formed nano-crystals prove effective photonic tested compared to chemically-formed nano-materials,...
The reaction products and microstructure of an 8 M NaOH-activated fly ash (AAFA) cured with microwave thermal oven curing were comparatively investigated. results show that the formation Al-rich N-A-S-H gel a flaky morphology crystalline chabazite-Na between particles favoured under curing, whilst Si-rich fibrilllar hydroxysodalite on surface dominant curing. these unique is attributed not only to effect microwaves which can increase temperature AAFA volumetrically, but also non-thermal...
Nitrogen-doped $\ensuremath{\beta}\ensuremath{-}{\mathrm{Ga}}_{2}{\mathrm{O}}_{3}$ nanowires (GaO NWs) were prepared by annealing the as-grown in an ammonia atmosphere. The optical properties of nitrogen-doped GaO NWs studied measurements photoluminescence and phosphorescence decay at temperature range between 10 300 K. experimental results revealed that nitrogen doping induced a novel intensive red-light emission around 1.67 eV, with characteristic time 136 \ensuremath{\mu}s 77 K, much...
Stoichiometric ZnSe nanowires have been synthesized through a vapor phase reaction of zinc and selenium powder on the (100) silicon substrate coated with gold film 2 nm in thickness. The microstructures chemical compositions as-grown investigated by means electron microscopy, energy dispersive spectroscopy, Raman spectroscopy. results reveal that materials consist diameters ranging from 5 to 50 nm. Photoluminescence sample demonstrates strong green emission room temperature down 10 K. This...
Stoichiometric Co3O4 porous nanotubes have been synthesized through a simple modified microemulsion method. The structural and the chemical information of as-grown investigated by means x-ray diffraction, electron microscopy, energy loss spectroscopy, dynamic force microscopy. results reveal that materials are formed concentric stacking (111) planes or weaved with diameters ranging from tens to ∼200nm sidewall thickness 2to∼20nm. Magnetic property sample demonstrates magnetic transition...
In this work, three polyimides (PIs) are successfully synthesized by the condensation reaction of an aromatic triamine with difunctional dianhydrides. These materials show electrochemical lithium ion storage properties as cathodes for lithium-ion batteries. The dianhydride monomers found to have significant effects on their performances. addition, polymer PI-1 shows narrow micropore size distributions and selective adsorption CO2 over CH4 N2. Furthermore, exhibits a high Qst value (11.7 kJ...