A5063849879- 2D Materials and Applications
- MXene and MAX Phase Materials
- Crystallization and Solubility Studies
- Perovskite Materials and Applications
- X-ray Diffraction in Crystallography
- Graphene research and applications
- Chalcogenide Semiconductor Thin Films
- Plasmonic and Surface Plasmon Research
- Metal-Organic Frameworks: Synthesis and Applications
- Topological Materials and Phenomena
- Nanowire Synthesis and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Quantum Dots Synthesis And Properties
- Gas Sensing Nanomaterials and Sensors
- Analytical Chemistry and Sensors
- Acoustic Wave Resonator Technologies
- Advanced Memory and Neural Computing
- Electrochemical Analysis and Applications
- Magnetism in coordination complexes
- Ferroelectric and Piezoelectric Materials
- Advanced Photocatalysis Techniques
- Covalent Organic Framework Applications
- Machine Learning in Materials Science
- Lanthanide and Transition Metal Complexes
- Electrocatalysts for Energy Conversion
Massachusetts Institute of Technology
2018-2025
Nanjing University
2025
IIT@MIT
2024
Boston University
2018-2022
Dalian Maritime University
2020
Peking University
2013-2018
State Key Laboratory for Structural Chemistry of Unstable and Stable Species
2013-2018
Huazhong University of Science and Technology
2017-2018
Beijing National Laboratory for Molecular Sciences
2013-2017
National Center for Nanoscience and Technology
2013-2016
Defects usually play an important role in tailoring various properties of two-dimensional materials. monolayer molybdenum disulphide may be responsible for large variation electric and optical properties. Here we present a comprehensive joint experiment-theory investigation point defects prepared by mechanical exfoliation, physical chemical vapour deposition. Defect species are systematically identified their concentrations determined aberration-corrected scanning transmission electron...
Two are better than one: A mixed-solvent method for liquid exfoliation of MoS2, WS2, and BN nanosheets is presented. Although ethanol water both poor solvents this process, ethanol/water mixtures appropriate composition, which can be predicted on the basis Hansen solubility parameters, result in efficient (see schematic) to give highly stable suspensions.
Abstract Surface‐enhanced Raman spectroscopy (SERS) imparts with the capability of detecting analytes at single‐molecule level, but costs are also manifold, such as a loss signal reproducibility. Despite remarkable steps having been taken, presently SERS still seems too young to shoulder analytical missions in various practical situations. By virtue its unique molecular structure and physical/chemical properties, rise graphene opens up platform for studies. In this review, multi‐role played...
Semiconducting MoS2(1-x)Se2x monolayers where x = 0–0.40 are successfully grown over large areas. A random arrangement of the S and Se atoms a tunable bandgap photoluminescence observed. Atomically thin, 2D semiconductor alloys with bandgaps have potential applications in nano- opto-electronics. Field-effect transistors fabricated monolayers exhibit high on/off ratios >105. As service to our authors readers, this journal provides supporting information supplied by authors. Such materials...
Abstract An optical anisotropic nature of black phosphorus (BP) is revealed by angle‐resolved polarized Raman spectroscopy (ARPRS), and for the first time, an all‐optical method was realized to identify crystal orientation BP sheets, that is, zigzag armchair directions. We found intensities A g 1 , B 2g 2 modes not only depend on polarization angle α, but also relate sample rotation θ. Furthermore, their reach local maximum or minimum values when crystalline along with direction scattered...
The striking in-plane anisotropy remains one of the most intriguing properties for newly rediscovered black phosphorus (BP) 2D crystals. However, because its rather low-energy band gap, optical few-layer BP has been primarily investigated in near-infrared (NIR) regime. Moreover, essential physics that determine intrinsic anisotropic property BP, which is great importance practical applications and optoelectronic devices, are still fancy theory. Herein, we report direct observation visible...
A 2D atomic‐layer‐thickness phototransistor based on a graphene‐MoS 2 bybrid device is constructed with photoresponse much larger than that of individual graphene or MoS phototransistors. Strong and selective light absorption in the layer creates electric charges are transferred to layers derived by build‐in electrical field, where they recirculate many times due high carrier mobility graphene. Gate tunable Fermi level allows responsivity this hybrid be continuously tuned from 0 about 10 4...
Transition-metal dichalcogenide (TMD) monolayer alloys are a branch of two-dimensional (2D) materials which can have large-range band gap tuning as the composition changes. Synthesis 2D TMD with controlled well domain size and edge structure is great challenge. In present work, we report growth MoS2(1-x)Se2x (x = 0.41-1.00) morphology large using physical vapor deposition (PVD). different orientations (Mo-zigzag S/Se-zigzag orientations) been obtained by controlling temperature. Large up to...
Anisotropic layered semiconductors have attracted significant interest due to the huge possibility of bringing new functionalities thermoelectric, electronic and optoelectronic devices. Currently, most reports on anisotropy concentrated black phosphorus ReS2, less effort has been contributed other materials. In this work, two-dimensional (2D) orthorhombic SnS flakes a large scale successfully synthesized via simple physical vapor deposition method. Angle-dependent Raman spectroscopy...
Two-dimensional transition-metal dichalcogenide alloys have attracted intense attention due to their tunable band gaps. In the present work, photoluminescence, Raman scattering, and electrical transport properties of monolayer few-layer molybdenum tungsten diselenide (Mo1–xWxSe2, 0 ≤ x 1) are systematically investigated. The strong photoluminescence emissions from Mo1–xWxSe2 monolayers indicate composition-tunable direct gaps (from 1.56 1.65 eV), while weak broad bilayers indirect...
Two-dimensional (2D) transition-metal dichalcogenide alloys with tunable band gaps have promising applications in nanoelectronics and optoelectronics. Characterization of structures 2D alloys, such as composition atom mixing, is fundamental importance to their applications. Here, we conducted systematic Raman spectroscopic studies on Mo1-xWxS2 monolayers (0 ≤x≤ 1). First-order modes second-order been observed the range 100-480 cm(-1) alloys. The out-of-plane A1' in-plane E' showed one-mode...
The effect of surrounding solvents on the photoluminescence (PL) MoS2 monolayers Si/SiO2 substrates is studied. A redshift (up to −60 meV) observed for with nonhalogenated solvent surroundings. blueshift 60 and intensity increase (2–50 times) are halogenated
Monolithic conjugated microporous polymer (CMP) aerogels are obtained in an extremely facile way by selection of adequate reaction conditions and a freeze-drying technique. The possess ultrahigh specific surface area hierarchical interconnected pores, exhibiting superb gas/oil adsorption performance compared with all organic polymers to date.
Surface-enhanced Raman scattering (SERS) on two-dimensional (2D) layered materials has provided a unique platform to study the chemical mechanism (CM) of enhancement due its natural separation from electromagnetic enhancement. The CM stems charge interactions between substrate and molecules. Despite extensive studies energy alignment 2D molecules, an understanding how electronic properties are explicitly involved in interaction is still unclear. Lately, new group with anisotropic structures,...
Zwei sind besser als eines: Eine auf einem Lösungsmittelgemisch basierte Methode zur Flüssigexfoliation von MoS2-, WS2- und BN-Nanoblättchen wurde entwickelt. Während EtOH H2O jeweils schlechte Lösungsmittel für diesen Prozess sind, ergeben EtOH/H2O-Mischungen geeigneter Zusammensetzung (voraussagbar anhand der Hansen-Löslichkeitsparameter) eine effiziente Exfoliation (siehe Bild) unter Bildung hochstabiler Suspensionen.
As an anisotropic 2D layered material, rhenium disulfide (ReS2) has attracted much attention because of its unusual properties and promising applications in electronic optoelectronic devices. However, the low lattice symmetry interlayer decoupling ReS2 make asymmetric growth out-of-plane occur quite easily; therefore, thick flake, dendritic flower-like structures have mostly been obtained previously. Here, we report on approach based space-confined epitaxial for controlled synthesis films....
We report the cooling-induced crystallization of layered two-dimensional (2D) lead halide perovskites with controllable inorganic quantum-well thicknesses (n = 1, 2, 3, and 4), organic-spacer chain lengths (butyl-, pentyl-, hexylammonium), A-site cations (methylammonium formamidinium), anions (iodide bromide). Using single-crystal X-ray diffraction, we refined crystal structures for iodide family as a function these compositional parameters across their temperature-dependent phase...
Abstract An optical anisotropic nature of black phosphorus (BP) is revealed by angle‐resolved polarized Raman spectroscopy (ARPRS), and for the first time, an all‐optical method was realized to identify crystal orientation BP sheets, that is, zigzag armchair directions. We found intensities A g 1 , B 2g 2 modes not only depend on polarization angle α, but also relate sample rotation θ. Furthermore, their reach local maximum or minimum values when crystalline along with direction scattered...
By utilizing the dual roles of erasable promoter (pyrrole), "clean", highly conductive, and nitrogen-doped CNT aerogels are derived from a promoter-assisted hydrothermal reaction (HTR) coupling with pyrolysis. The resulting materials show an excellent performance towards oxygen reduction (ORR).
Lateral heterostructures with planar integrity form the basis of two-dimensional (2D) electronics and optoelectronics. Here we report that, through a two-step chemical vapor deposition (CVD) process, high-quality lateral can be constructed between metallic semiconducting transition metal disulfide (TMD) layers. Instead edge epitaxy, polycrystalline monolayer MoS2 in such junctions was revealed to nucleate from vertices multilayered VS2 crystals, creating one-dimensional ultralow contact...