A5024424505- Graphene research and applications
- Surface Chemistry and Catalysis
- Surface and Thin Film Phenomena
- Boron and Carbon Nanomaterials Research
- Quantum and electron transport phenomena
- Molecular Junctions and Nanostructures
- MXene and MAX Phase Materials
- 2D Materials and Applications
- Topological Materials and Phenomena
- Advancements in Battery Materials
- Magnetic properties of thin films
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Semiconductor materials and devices
- Spectroscopy and Quantum Chemical Studies
- Chemical and Physical Properties of Materials
- Metallurgical and Alloy Processes
- Anodic Oxide Films and Nanostructures
- Pharmaceutical studies and practices
- Immunodeficiency and Autoimmune Disorders
- Force Microscopy Techniques and Applications
- Lymphatic Disorders and Treatments
- Advanced Chemical Physics Studies
- Interstitial Lung Diseases and Idiopathic Pulmonary Fibrosis
- Solidification and crystal growth phenomena
University of Chinese Academy of Sciences
2017-2025
Yale University
2018-2025
Institute of Semiconductors
2025
Institute of Physics
2012-2021
Pennsylvania State University
2008-2020
Chinese Academy of Sciences
2013-2020
University of New Haven
2019
National Center for Nanoscience and Technology
2017
University of Houston
2016
Silicene, a two-dimensional (2D) honeycomb structure similar to graphene, has been successfully fabricated on an Ir(111) substrate. It is characterized as (√7×√7) superstructure with respect the substrate lattice, revealed by low energy electron diffraction and scanning tunneling microscopy. Such coincides (√3×√3) superlattice of silicene. First-principles calculations confirm that this (√3×√3)silicene/(√7×√7)Ir(111) configuration it buckled conformation. Importantly, calculated localization...
Two-dimensional topological insulators with a large bulk band gap are promising for experimental studies of quantum spin Hall effect and spintronic device applications. Despite considerable theoretical efforts in predicting large-gap two-dimensional insulator candidates, none them have been experimentally demonstrated to full gap, which is crucial effect. Here, by combining scanning tunneling microscopy/spectroscopy angle-resolved photoemission spectroscopy, we reveal that ZrTe5 crystal...
Two-dimensional (2D) honeycomb systems made of elements with d electrons are rare. Here, we report the fabrication a transition metal (TM) 2D layer, namely, hafnium crystalline layers on Ir(111). Experimental characterization reveals that Hf layer has its own lattice, morphologically identical to graphene. First-principles calculations provide evidence for directional bonding between adjacent atoms, analogous carbon atoms in Calculations further suggest freestanding could be ferromagnetic...
Abstract Borophene, an atomically thin covalently bonded boron sheet, has attracted great attention as a novel quantum material because of its structural tunability and potential utilization in flexible transparent electronics. So far, borophene been synthesized on silver or copper single crystals, but these substrates are small, very expensive, unsuitable for study transport properties electronics applications. Here, we report synthesis nanometer-scale thick Cu(111) films grown sapphire. We...
Six types of moiré superstructures graphene on Ir(111) with different orientations (labeled as R0, R14, R19, R23, R26 and R30) are investigated by low-energy electron diffraction, scanning tunneling microscopy first-principles calculations. The superstructure R0 has remarkable diffraction spots deeper corrugation than that the other superstructures. A high-order commensurate (HOC) method is applied to produce a list all possible Ir(111). Several useful structural data including precise...
We report on the structural and electronic properties in heterostructure of graphene/silicon/Ir(111). A (√19 × √19)R23.41° superstructure is confirmed by low energy electron diffraction scanning tunneling microscopy its formation ascribed to silicon intercalation at interface between graphene Ir(111) substrate. The dI/dV measurements indicate that interaction Ir effectively decoupled after intercalation. Raman spectroscopy also reveals vibrational states graphene, G peak 2D peak, which...
Two-dimensional (2D) quantum materials, including several analogs of graphene (“X-enes”), are great current research interest. However, some the potentially most exciting ones reactive and sensitive to exposure atmosphere, which hampered experimental study their key physical properties. Here, we introduce an setup that integrates sub-atomic-layer-resolved molecular beam epitaxy (MBE) synthesis, real-time low-energy electron microscopy (LEEM) diffraction (LEED), in situ six-probe electrical...
We report on the change of structural and electronic properties while depositing Hf atoms onto graphene epitaxially grown Ir(111) substrate. find that intercalate between its iridium host. This intercalation induces a new interface superstructure, as confirmed by scanning tunneling microscopy low energy electron diffraction. Raman spectra reveal Hf-intercalated shows prominent features intrinsic graphene. Our study suggests acts buffer layer substrate, restoring graphene's properties.
Structural and mechanical properties of self-assembled metal-free naphthalocyanine (H2Nc) films on a Ag(111) surface are studied. Six domains observed by scanning tunneling microscopy (STM). Combining the high-resolution STM images density functional theory (DFT) based calculations, we found that molecules adsorbed flatly substrate forming six different interlocked square-like unit cells with lattice parameters. DFT calculations indicated comparable adsorption energies for all...
A three-dimensional phase-field model was developed for studying domain structures in ferroelectric islands attached onto a substrate. It simultaneously takes into account the long-range electric and elastic interactions, substrate constraint, as well stress relaxation caused by surfaces of an island. The simulations demonstrated that could be dramatically different from those continuous thin films due to change state. distribution inside is highly dependent on aspect ratio islands. provides...
The construction of metal–organic molecular wires is important for the design specific functional devices but has been a great challenge experimental technology. Here we report formation one-dimensional structures by direct deposition pentacene molecules on Au(110) surface with subsequent thermal annealing. These were systematically explored scanning tunneling microscopy (STM) and density theory calculations. At submonolayer coverage, during annealing at ∼470 K, adsorbed induce both...
The combined experimental and theoretical results demonstrate the manipulation of 2D VDW silica Ni silicate through growth conditions, determination maximum epitaxial strain imparted to system alloy substrate.
Background : The association of DLG5 R30Q with IBD has been replicated in several populations, but is not statistically significant others. We studied the incidence alleles a population patients from Pennsylvania. Methods (rs1248696) and G1066G (rs1248634) were analyzed PCR-based RFLP methods total 521 subjects, that included 105 individuals 139 without familial registry, 107 sporadic IBD, 170 unrelated healthy controls. was further SNPlex™ Genotyping System 473 samples. Results genotyping...
Structural, electronic, and mechanical properties of graphene islands grown by depositing carbon atoms directly onto a hot single crystal Ag(110) surface are experimentally investigated. First, nano-islands with morphologies tuned flux substrate temperatures fabricated. Moiré superstructures found to be superposed on the islands, corresponding islands' varied orientations periodicities respect underlying substrate. Both Scanning tunnelling spectroscopy Raman indicate weak interaction between...
Synthesis, characterisation and crystal structure analysis studies of oxides in (Gd2−x Cex)Ti2O7 series have been reported, Ce3+ used as a surrogate for Pu3+ because they similar physical chemical properties. In the present report, pyrochlore-type with composition (0 ≤ x 0.8) were successfully synthesised by solution combustion followed high temperature calcining. The phase purity samples investigated X-ray diffraction well Rietveld refinement. It was observed that solubility lattice...
Here we report the thermo-controllable self-assembled structures of single-layer 4, 4''-diamino-p-terphenyl (DAT) molecules on Au (110), which are investigated by scanning tunneling microscopy (STM) combined with density functional theory (DFT) based calculations. With deposition monolayer DAT (110) and subsequent annealing at 100 °C, all adsorb a (1 × 5) reconstructed surface ladder-like structure. After sample about 200 STM images show three distinct domains, including 3) surface,...
Structures of self-assembled films play essential roles in the performance potential organic molecular electronics; therefore, detailed knowledge adsorption and structural evolution is fundamental for implementation electronics. Here, we systematically investigated initial structure metal-free naphthalocyanine (H2Nc) on Ag(111) surface from dimers to ordered structures submonolayer range. H2Nc molecules deposited at 100 K accumulate into clusters dominated by dimers. Subsequent sample...
Hydrogen atoms bonded within molecular cavities often undergo tunneling or thermal-transfer processes that play major roles in diverse physical phenomena. Such transfers may not entail intermediate states. The existence of such fleeting states is typically determined by indirect means, while their direct visualization has been achieved, largely because concentrations under equilibrium conditions are negligible. Here we use density-functional-theory calculations and...
Abstract Synthesis of vertical heterostructures that include atomically thin layers materials with topologically nontrivial energy bands is desirable for exploring exotic quantum states. Here, the authors report on atomic‐layer‐by‐layer deposition magnesium copper(111) surface by molecular beam epitaxy, monitored in situ low‐energy electron microscopy and diffraction, modeled ab initio theory. It found a 2D MgCu 2 intermetallic compound forms during initial Mg persists till full monolayer...
The linkage structures between monomers make great influence on the properties of polymers. synthesis some special can be challenging, which is often overcome by employing reaction conditions. Here,we build dihydropentalene in poly-naphthalocyanine Ag(110) surface. Scanning tunneling microscopy (STM) and non-contact atomic force (nc-AFM) measurements confirm dihydropentalenelinkage structure a possible formation path with reconstruction steps proposed. controlled experiment Ag(100) surface...