A5022808671- Carbon Nanotubes in Composites
- Rare-earth and actinide compounds
- Magnetic properties of thin films
- nanoparticles nucleation surface interactions
- Graphene research and applications
- Semiconductor materials and interfaces
- Nanotechnology research and applications
- Magnetic Properties and Synthesis of Ferrites
- Metallic Glasses and Amorphous Alloys
- Ion-surface interactions and analysis
- Boron and Carbon Nanomaterials Research
- Muon and positron interactions and applications
- Lubricants and Their Additives
- Advanced Chemical Physics Studies
- Advanced Condensed Matter Physics
- Adhesion, Friction, and Surface Interactions
- Force Microscopy Techniques and Applications
- Fusion materials and technologies
- Glass properties and applications
- Fuel Cells and Related Materials
- Semiconductor materials and devices
- Advanced Thermoelectric Materials and Devices
- Polymer Nanocomposite Synthesis and Irradiation
- ZnO doping and properties
- Silicon Nanostructures and Photoluminescence
Nanjing University
2001-2024
Tsinghua University
2000-2016
Collaborative Innovation Center of Advanced Microstructures
2001-2003
Artificial ordered layered structures were grown in the nanosized Ag-Co and Ag-Ni multilayered films upon ion irradiation both identified to consist of two overlapping fcc lattices, corresponding new magnetic states ferromagnetic metals Co Ni. Surprisingly, newly formed structures, average moment per atom was found be $2.84{\ensuremath{\mu}}_{B},$ much larger than ever reported before, while Ni decreased 1/3 its equilibrium value. The driving force for growing from a dynamic atomic collision...
Ab initio calculations predict that the magnetic moments of metastable fcc and bcc Co are 1.63 $1.69{\ensuremath{\mu}}_{B},$ respectively, which greater than $1.57{\ensuremath{\mu}}_{B}$ value equilibrium hcp Co. For Co-Ag system, ab reveal ${\mathrm{CoAg}}_{3},$ ${\mathrm{Co}}_{3}\mathrm{Ag},$ CoAg alloys energetically favored to be in ${D0}_{19},$ $B2$ structures, all prefer ferromagnetic rather paramagnetic. Moreover, atom enhanced 1.62 $1.76{\ensuremath{\mu}}_{B}$ ${D0}_{19}$...
Employing the Vienna ab initio simulation package (VASP), a possible nonequilibrium intermediate state located near ${\mathrm{Ag}}_{3}\mathrm{Ni}$ in immiscible Ag-Ni system is predicted through calculating total energy of six structures ${A}_{3}B$ type as function their lattice constants. The confirmed by fact that metastable hcp phase was indeed obtained properly designed multilayers upon 200 keV xenon ion irradiation at 77 K and its constants determined diffraction analysis were good...
These vertically aligned Ta2O5 nanorods were deposited on Si (100) substrates by thermal deposition in a vacuum of the order 10−2 Torr at about 600°C. When excited 514 nm Ar+ laser, they showed strong photoluminescence ∼622 nm, which was attributed to oxygen vacancies. In addition, their dielectric constant is ∼20 frequency range from 1 kHz 10 MHz, far larger than that SiO2 and Si3N4. Due this cone-shaped morphology, exhibited threshold field ∼8.5 V/μm emission enhancement factor 764 are...
By using molecular dynamics simulation with an n-body Ni–Mo potential, the relative stability of Ni- and Mo-based solid solutions versus their amorphous counterparts is studied as a function solute concentrations at 300 K. It observed that supersaturated terminal have maximum or critical 21 at. % Mo in Ni 25 Mo, respectively, beyond which transform into phase. As such, glass-forming range system derived to be 21–75 Mo. The computed are compared those predicted by generalized Lindemann...
Static tensile tests, dynamic mechanical analysis as well electron microscopy were used to characterize the macromechanical properties of MWNT-filled polycarbonate composites. Meanwhile behavior nanotube/polymer interfaces was examined by changing nanotube contents and measuring electrical conductivity dielectric spectroscopy. When interface achieved state percolation (2 mass% MWNT), strain fracture composites reached a peak 9.3%, elastic modulus increased 30% comparing pure damping ratio...
Abstract Carbon nanotubes (CNTs) have been synthesized from Ar-CH 4 mixtures using rf-plasma enhanced chemical vapor deposition (rf-PECVD) at 500°C. Reduction gases such as H 2 and NH 3 were found unnecessary for carbon nanotube formation compared to thermal CVD. The relationship between the growth of CNTs plasma condition in PECVD has investigated by situ self bias measurement. Plasma conditions controlled changing interelectrode distance, rf power applied substrate negative bias. By...
The degradation of reactor pressure vessel steels under irradiation, which results from the hardening and embrittlement caused by a high number density nanometer scale damage, is increasingly crucial concern for safe nuclear power plant operation possible lifetime prolongation. In this paper, radiation damage in model alloys with increasing chemical complexity (Fe, Fe-Cu, Fe-Cu-Si, Fe-Cu-Ni Fe-Cu-Ni-Mn) has been studied Positron Annihilation Doppler Broadening spectroscopy after 1.5 MeV...
We investigate the magnetic and electronic properties of Co films on Fe3O4(001) achieved through epitaxial growth using magnetron sputtering. X-ray circularly dichroism measurements characterize atomic magnetism. Compared to MgO substrate, Fe3O4 exhibits a 96% enhancement in orbital moment (from 0.25 0.49 µB/atom) an increase spin 1.37 1.53 µB/atom), resulting increased mratio(ml/ms) from 0.18 0.32. This emerges as consequence interface interaction between Fe3O4. Density functional theory...
Owing to their distinctive novel properties, topological metals hold significant promise for application in spintronics, quantum computing, and superconductivity. Using first-principle calculations, we have elucidated the unfolding band structure of 3d transition metal (3d-TM)-doped CrTe2. Notably, our investigation has revealed crossings Cu-doped CrTe2, forming a nodal ring near Fermi level. Through analyzing Wannier charge centers, established nontriviality CrTe2 upon Cu doping. This study...
Abstract The frictional responses of graphene and boron nitride lubricants is studied from the perspective potential energy evolution. At a low normal load regime high interface adhesion, friction can be effectively characterized by investigating interfacial barrier formation process. By decomposing evolution into strain cohesive components, we find that oscillation phase difference plays an essential role in response controlled conversion between them. Analyses further reveal oscillations...