A5101967475- 2D Materials and Applications
- MXene and MAX Phase Materials
- Ferroelectric and Piezoelectric Materials
- Graphene research and applications
- Multiferroics and related materials
- Magnetic and transport properties of perovskites and related materials
- Advancements in Semiconductor Devices and Circuit Design
- Nanowire Synthesis and Applications
- Semiconductor materials and devices
- Advanced Thermoelectric Materials and Devices
- Ga2O3 and related materials
- Perovskite Materials and Applications
- Dielectric materials and actuators
- Hemoglobinopathies and Related Disorders
- Molecular Junctions and Nanostructures
- Luminescence Properties of Advanced Materials
- Metal and Thin Film Mechanics
- Microwave Dielectric Ceramics Synthesis
- Radiation Detection and Scintillator Technologies
- Conducting polymers and applications
- Boron and Carbon Nanomaterials Research
- Ferroelectric and Negative Capacitance Devices
- Electronic and Structural Properties of Oxides
- Advanced Memory and Neural Computing
- Porphyrin and Phthalocyanine Chemistry
George Mason University
2015-2024
National Institute of Standards and Technology
2007-2023
National Institute of Standards
2022-2023
Shenzhen University
2023
Beijing Children’s Hospital
2022
Capital Medical University
2022
Nanjing University
1999-2020
South China Normal University
2019-2020
Huazhong University of Science and Technology
2020
Collaborative Innovation Center of Advanced Microstructures
2020
We present the results of a thorough study wet chemical methods for transferring vapor deposition grown graphene from metal growth substrate to device-compatible substrate. On basis these results, we have developed "modified RCA clean" transfer method that has much better control both contamination and crack formation does not degrade quality transferred graphene. Using this method, high device yields, up 97%, with narrow performance metrics distribution were achieved. This demonstration...
We report reduced contact resistance of single-layer graphene devices by using ultraviolet ozone (UVO) treatment to modify the metal/graphene interface. The were fabricated from mechanically transferred, chemical vapor deposition (CVD) grown, single layer graphene. UVO in regions as defined photolithography and prior metal was found reduce interface contamination originating incomplete removal poly(methyl methacrylate) (PMMA) photoresist. Our control experiment shows that exposure times up...
In this work, we compare the electrical characteristics of MoS2 field-effect transistors (FETs) with Ag source/drain contacts those Ti and demonstrate that metal–MoS2 interface is crucial to device performance. FETs show more than 60 times higher ON-state current contacts. order better understand mechanism performance contacts, 5 nm Au/5 (contact layer) or film was deposited onto monolayers few layers, topography metal films characterized using scanning electron microscopy atomic force...
Abstract In this work, we have studied thermoelectric properties of monolayer and fewlayer MoS 2 in both armchair zigzag orientations. Density functional theory (DFT) using non-equilibrium Green’s function (NEGF) method has been implemented to calculate the transmission spectra mono- directions. Phonon are calculated based on parameterization Stillinger-Weber potential. Thermoelectric figure merit, ZT, is these electronic phonon spectra. general, a generator composed thermocouples made...
Abstract Lead‐free (1‐ x )BiFeO 3 ‐ (0.85BaTiO ‐0.15Bi(Sn 0.5 Zn )O ) [(1‐ )BF‐ (BT‐BSZ), =0.45‐0.7] ceramic samples were prepared by solid phase sintering. It is revealed that the pure single‐phase perovskite structure can be obtained in with ≥ 0.6. With increasing , measured ferroelectric hysteresis loop becomes gradually slimmed accompanying reduced remnant polarization, and a clear ferroelectric‐relaxor transition at = 0.65 identified. Furthermore, electric breakdown strength...
The purpose of this study was to evaluate the clinical efficacy, toxicity and adverse effects stereotactic body radiotherapy (SBRT) combined with transarterial chemoembolization (TACE) in patients advanced hepatocellular carcinoma (HCC) portal vein tumor thrombosis (PVTT). A total 101 diagnosed primary HCC PVTT were enrolled randomly divided into three groups as follows: group A, 34 treated γ-SBRT followed by TACE; B, 37 TACE γ-SBRT; C, 30 alone. effective response rate for entire patient...
Rhenium disulfide (ReS2) is a semiconducting layered transition metal dichalcogenide that exhibits stable distorted 1 T (Re in octahedral coordination) phase. The reduced symmetry ReS2 leads to in-plane anisotropy various material properties. In this work, we performed comprehensive first-principle computational study of strain effect on the anisotropic mechanical and electronic properties monolayers. We found ratio electron mobility along two principle axes 2.36 while hole reaches 7.76....
We have performed a comprehensive first-principle computational study of the electronic properties one-dimensional phosphorene nanotubes (PNTs), and strain effect on mechanical electrical PNTs, including elastic modulus, energy bandstructure, carrier effective mass. The has demonstrated that armchair PNTs semiconducting along axial direction mobility can be significantly improved by compressive strain. hole increases from 40.7 cm2/V s to 197.0 as −5% at room temperature. investigations size...
Abstract Ferroelectric vortex is one of unique domain structures in the hexagonal R MnO 3 ( =Sc, Y, Ho-Lu) systems. This pattern quite sensitive to crystal imperfections, such as lattice defects and oxygen vacancies, which has been previously observed studied a single-crystal structure. Here we report epitaxial growth YMnO thin films on platinum-coated Al 2 O (0001) substrates. High-quality (0001)/Pt(111)/Al heterostructures with sharp interfaces have achieved characterised by using X-ray...
Permanent correction of genetic deficiencies the hematopoietic system requires gene transfer into stem cells and long-term lineage specific expression after autologous transplantation. However, progress to develop therapy protocols has been hampered by absence in vivo assays that detect genetically deficient human their diseased differentiated progeny. The establishment systems transplant Immune-deficient SCID mice provides such an assay. We report primitive bone marrow from β-thalassemia...
High purity crystals of Y2FeMnO6 (YFMO) and Y2CrMnO6 (YCMO) have been synthesized for the first time using a flux method under high temperature 1573 K pressure 6 GPa. Both YFMO YCMO orthorhombic structures in space group Pnma. The temperature-dependent magnetization nonlinear M-H hysteresis loops both materials indicate that an antiferromagnetic transition occurs at Néel 328 YFMO, ferrimagnetic 74 YCMO. is relaxor ferroelectric which three dielectric relaxations were observed 245, 358 K,...
A two-dimensional heterostructure of WSe<sub>2</sub>/MoS<sub>2</sub> atomic layers has unique piezoelectric characteristics which depend on the number layers, stacking type and interlayer interaction size.
Abstract Magnetic alloys are key to develop efficient catalysts for oxygen reduction reaction (ORR) in fuel cells. During the last decade, it has been shown that spin manipulation of magnetic materials can improve kinetics triplet state 3 O 2 electrocatalysis, promoting unification between physics strongly correlated and heterogeneous catalysis. In this study, structurally ordered Pt Co nanowires (NWs) synthesized, their ORR catalytic performances studied detail. These intermetallic L1 ‐Pt...
A 2 × layer-buckled manganese oxide, K(0.66)Mn(2)O(4)·0.28H(2)O (I), has been synthesized under high pressure and retained at ambient pressure; it is metastable will finally transform to a 1 K(0.99)Mn(3)O(6)·1.25H(2)O (II) in year. Both crystal structures were determined by single-crystal X-ray diffraction. On the basis of these buckled layers, which are result ordering Mn(3+)/Mn(4+) separate rows cooperative Jahn-Teller distortion Mn(3+)O(6) octahedra, mechanism structure transformation...
Gate assisted contact-end Kelvin test structures and gate four-probe have been designed fabricated to measure the field effects of current crowding at source/drain contacts top-gate MoS2 effect transistors. The transistors exhibited n-type transistor characteristics. contact resistance was measured by using both gate-assisted structures. values these two are significantly different. contact-front obtained from structure is strongly influenced on crowding, while not. metal-MoS2 transfer...
Abstract Transition metal dichalcogenides (TMDCs), such as MoS 2 and WSe , provide two-dimensional atomic crystals with semiconductor band gap. In this work, we present a design of new mechano-electric generators sensors based on transition dichalcogenide nanoribbon PN junctions heterojunctions. The conversion was simulated by using first-principle calculation. output voltage junction increases strain, reaching 0.036 V at 1% strain 0.31 8% much larger than the reported results. Our study...
Stimulating neural electrodes are required to deliver charge an environment that presents itself as hostile. The need maintain their electrical characteristics (charge and impedance) in vivo for a proper functioning of prostheses. Here we design implantable multi-walled carbon nanotubes coating stainless steel substrate electrodes, targeted at wide frequency stimulation deep brain structures. In well-controlled, low-frequency acute experiments, show nanotube storage capacity (CSC) impedance...
Abstract The Schottky contact, formed at the interface between a metal and semiconductor, is instrumental in defining electrical properties of barrier diodes (SBDs). characteristics contact are contingent on interacting semiconductor properties. Herein, we studied carrier-transport mechanisms room elevated temperatures. These SBDs employ pre-treated Ga 2 O 3 thin films either Ni or Au contacts. (pre-T) via annealing 900 °C under an N atmosphere for showed highest on/off ratio temperature....