A5073713478- 2D Materials and Applications
- Graphene research and applications
- MXene and MAX Phase Materials
- Perovskite Materials and Applications
- Topological Materials and Phenomena
- Molecular Junctions and Nanostructures
- Electronic and Structural Properties of Oxides
- Iron-based superconductors research
- Covalent Organic Framework Applications
- Advanced Thermoelectric Materials and Devices
- X-ray Diffraction in Crystallography
- Luminescence and Fluorescent Materials
- Crystallization and Solubility Studies
- Metal-Organic Frameworks: Synthesis and Applications
- Organic Electronics and Photovoltaics
- Crystallography and molecular interactions
- Quantum and electron transport phenomena
- Chalcogenide Semiconductor Thin Films
- Physics of Superconductivity and Magnetism
- Advanced Condensed Matter Physics
- Nanowire Synthesis and Applications
- Advanced Photocatalysis Techniques
- Quantum Dots Synthesis And Properties
- Advanced Memory and Neural Computing
- Cellular and Composite Structures
Beijing Institute of Technology
2021-2025
Ministry of Industry and Information Technology
2024
Renmin University of China
2014-2023
National University of Singapore
2020-2022
Hong Kong Polytechnic University
2016-2020
Two-dimensional crystals are emerging materials for nanoelectronics. Development of the field requires candidate systems with both a high carrier mobility and, in contrast to graphene, sufficiently large electronic bandgap. Here we present detailed theoretical investigation atomic and structure few-layer black phosphorus (BP) predict its electrical optical properties. This system has direct bandgap, tunable from 1.51 eV monolayer 0.59 five-layer sample. We that mobilities hole-dominated,...
The electrical and optical measurements, in combination with density functional theory calculations, show distinct layer-dependent semiconductor-to-semimetal evolution of 2D layered PtSe2 . high room-temperature electron mobility near-infrared photo-response, together much better air-stability, make a versatile electronic material.
Black phosphorus (BP) has attracted significant interest as a monolayer or few-layer material with extraordinary electrical and optoelectronic properties. However, degradation in air other environments is an unresolved issue that may limit future applications. In particular the role of different ambient species remained controversial. Here, we report systematic experiments combined ab-initio calculations address effects oxygen water BP. Our results show BP rapidly degrades whenever present,...
Platinum disulfide (PtS2), a new member of the group-10 transition-metal dichalcogenides, is studied experimentally and theoretically. The indirect bandgap PtS2 can be drastically tuned from 1.6 eV (monolayer) to 0.25 (bulk counterpart), interlayer mechanical coupling almost isotropic. It explained by strongly interaction pz orbital hybridization S atoms. As service our authors readers, this journal provides supporting information supplied authors. Such materials are peer reviewed may...
One of the basic assumptions in organic field-effect transistors, most fundamental device unit electronics, is that charge transport occurs two dimensionally first few molecular layers near dielectric interface. Although mobility bulk semiconductors has increased dramatically, direct probing intrinsic two-dimensional limit not been possible due to excessive disorders and traps ultrathin thin films. Here, highly ordered single-crystalline mono- tetralayer pentacene crystals are realized by...
Organic thin-film transistors (OTFTs) with high mobility and low contact resistance have been actively pursued as building blocks for low-cost organic electronics. In conventional solution-processed or vacuum-deposited OTFTs, due to interfacial defects traps, the film has reach a certain thickness efficient charge transport. Using an ultimate monolayer of 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C8-BTBT) molecules OTFT channel, we demonstrate remarkable electrical characteristics,...
Covalent organic frameworks (COFs) are an emerging class of crystalline porous polymers with tailor-made structures and functionalities. To facilitate their utilization for advanced applications, it is crucial to develop a systematic approach control the properties COFs, including crystallinity, stability, However, such integrated design challenging achieve. Herein, we report supramolecular strategy-based linkage engineering fabricate versatile 2D hydrazone-linked COF platform coordination...
Organic field-effect transistors (OFETs) are of interest in unconventional form electronics. However, high-performance OFETs currently contact-limited, which represent a major challenge toward operation the gigahertz regime. Here, we realize ultralow total contact resistance (Rc) down to 14.0 Ω ∙ cm C10-DNTT by using transferred platinum (Pt) as contact. We observe evidence Pt-catalyzed dehydrogenation side alkyl chains effectively reduces metal-semiconductor van der Waals gap and promotes...
The anisotropic two-dimensional (2D) van der Waals (vdW) layered materials, with both scientific interest and potential application, have one more dimension to tune the properties than isotropic 2D materials. interlayer vdW coupling determines of multi-layer materials by varying stacking orders. As an important representative multilayer rhenium disulfide (ReS2) was expected be random lack coupling. Here, we demonstrate two stable orders (aa a-b) N layer (NL, N>1) ReS2 from...
Covalent organic frameworks are an emerging class of porous crystalline materials that can be designed and synthesized from the bottom up. Despite progress made in synthesizing COFs diverse topologies, synthesis methods often tedious unscalable, hampering practical applications. Herein, we demonstrate a scalable, robust method producing highly acylhydrazone two-dimensional (2D) with diversified structures (six examples) under open stirred conditions, growth typically completed only 30 min....
Interlayer coupling is of vital importance for manipulating physical properties, e.g. electronic bandgap, in two-dimensional materials. However, tuning magnetic proper-ties these materials yet to be addressed. Here, we found a striped antiferromag-netic (sAFM) ferromagnetic (FM) transition undergoing from monolayer bilayer and thicker CrS2. This attributed charge sharing interlayer S atoms its resulting transfer Cr d eg t2g orbitals. The transferred reduces portion Cr4+ Cr3+, which enhances...
Stacking two-dimensional (2D) materials into multi-layers or heterostructures, known as van der Waals (vdW) epitaxy, is an essential degree of freedom for tuning their properties on demand. Few-layer black phosphorus (FLBP), a material with high potential nano- and optoelectronics applications, appears to have interlayer couplings much stronger than graphene other 2D systems. Indeed, these call question whether the stacking FLBP can be governed only by vdW interactions, which crucial...
The 2D ternary transition metal phosphorous chalcogenides (TMPCs) have attracted extensive research interest due to their widely tunable band gap, rich electronic properties, inherent magnetic and ferroelectric properties. However, the synthesis of TMPCs via chemical vapor deposition (CVD) is still challenging since it difficult control reactions among multi-precursors. Here, a subtractive element growth mechanism proposed controllably synthesize TMPCs. Based on mechanism, including FePS
Two-dimensional (2D) multiferroic materials have significant application potential for novel storage devices due to their tunable magnetic and ferroelectric properties. Transition metal phosphorus chalcogenides MPX3 (X = S, Se, Te) were found be with excellent tunability, promising multifunctionalized applications. In this study, we investigated the antiferromagnetic antiferroelectric properties of two-dimensional FePX3 CuFeP2X6 by density functional theory. Monolayer FePS3/FePSe3 FePTe3...
Abstract A confined electronic system can host a wide variety of fascinating electronic, magnetic, valleytronic and photonic phenomena due to its reduced symmetry quantum confinement effect. For the recently emerging one-dimensional van der Waals (1D vdW) materials with electrons in 1D sub-units, an enormous intriguing physical properties functionalities be expected. Here, we demonstrate coexistence giant linear/nonlinear optical anisotropy high emission yield fibrous red phosphorus (FRP),...
Ni 3 (HITP) 2 /MXene heterostructures with conductivity and solution processability were constructed by a template assisted strategy. The /MXene-based gas sensors exhibit high sensitivity selectivity to ethanol at room temperature.
The edges of layered materials have unique properties that substantially differ from the body regions. In this work, we perform a systematic Raman study various (MoS2, WS2, WSe2, PtS2, and black phosphorus). spectra feature newly observed forbidden modes, which are originally undetectable region. By selecting edge type polarization directions incident scattered light, all modes distinctly detected. Optical simulations show drastically distort electromagnetic fields both so light interacts...
Layered charge-density-wave (CDW) materials have gained increasing interest due to their CDW stacking-dependent electronic properties for practical applications. Among the large family of materials, those with star David (SOD) patterns are very important potentials quantum spin liquid and related device However, spatial extension coupling information down nanoscale remain elusive. Here, we report study heterochiral stackings in bilayer (BL) NbSe2 high resolution. We reveal that there exist...
In this study, a comprehensive characterization was conducted on chiral starburst molecule (C57H48N4, SBM) using scanning tunneling microscopy. When adsorbed onto the hBN/Rh(111) nanomesh, these molecules demonstrate homochiral recognition, leading to selective formation of dimers. Further tip manipulation experiments reveal that dimers are stable and primarily controlled by strong intermolecular interactions. Density functional theory (DFT) calculations supported recognition SBM is governed...
Defect engineering provides a precise and controlled approach to modify the localized electronic properties through crystalline interruption. In 2D electron-correlated materials, periodic lattice distortions often coexist with charge density waves (CDWs) Mott insulating states, which are highly sensitive local environments. However, influence of complex, inequivalent defect sites on properties, particularly behavior, remains poorly understood. Here, functional theory calculation is utilized...