A5054639451- Graphene research and applications
- 2D Materials and Applications
- Topological Materials and Phenomena
- Quantum and electron transport phenomena
- Electronic and Structural Properties of Oxides
- Graphene and Nanomaterials Applications
- Quantum Dots Synthesis And Properties
- Semiconductor materials and devices
- Advancements in Battery Materials
- Perovskite Materials and Applications
- Chalcogenide Semiconductor Thin Films
- MXene and MAX Phase Materials
- Advanced Memory and Neural Computing
- Advanced Thermoelectric Materials and Devices
- Nanowire Synthesis and Applications
- Supercapacitor Materials and Fabrication
- Advanced Electron Microscopy Techniques and Applications
- Thermal properties of materials
- Gas Sensing Nanomaterials and Sensors
- Molecular Junctions and Nanostructures
- Electron and X-Ray Spectroscopy Techniques
- Ga2O3 and related materials
- Force Microscopy Techniques and Applications
- Advancements in Semiconductor Devices and Circuit Design
- Diamond and Carbon-based Materials Research
Peking University
2016-2025
Beijing National Laboratory for Molecular Sciences
2016-2025
Beijing Graphene Institute
2017-2025
National Taiwan University of Science and Technology
2024-2025
Taizhou People's Hospital
2020-2024
Nanjing Medical University
2022-2024
Nantong University
2020-2024
Guilin University of Electronic Technology
2023
Henan Provincial People's Hospital
2022
Weatherford College
2022
Silicon is an attractive alloy-type anode material for lithium ion batteries because of its highest known capacity (4200 mAh/g). However silicon's large volume change upon insertion and extraction, which causes pulverization fading, has limited applications. Designing nanoscale hierarchical structures a novel approach to address the issues associated with changes. In this letter, we introduce core-shell design silicon nanowires highpower long-life battery electrodes. crystalline-amorphous...
Efficient solar-thermal energy conversion is essential for the harvesting and transformation of abundant solar energy, leading to exploration design efficient materials. Carbon-based materials, especially graphene, have advantages broadband absorption excellent photothermal properties, hold promise conversion. However, date, graphene-based materials with superior omnidirectional light performances remain elusive. Herein, hierarchical graphene foam (h-G foam) continuous porosity grown via...
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...
Piezoelectric and ferroelectric properties in the two dimensional (2D) limit are highly desired for nanoelectronic, electromechanical, optoelectronic applications. Here we report first experimental evidence of out-of-plane piezoelectricity ferroelectricity van der Waals layered ${\alpha}$-In2Se3 nano-flakes. The non-centrosymmetric R3m symmetry samples is confirmed by scanning transmission electron microscopy, second-harmonic generation, Raman spectroscopy measurements. Domains with opposite...
Spinel LiMn2O4 is a low-cost, environmentally friendly, and highly abundant material for Li-ion battery cathodes. Here, we report the hydrothermal synthesis of single-crystalline β-MnO2 nanorods their chemical conversion into free-standing using simple solid-state reaction. The have an average diameter 130 nm length 1.2 μm. Galvanostatic testing showed that high charge storage capacity at power rates compared with commercially available powders. More than 85% initial was maintained over 100...
Graphene has a unique atom-thick two-dimensional structure and excellent properties, making it attractive for variety of electrochemical applications, including electrosynthesis, sensors or electrocatalysis, energy conversion storage. However, the electrochemistry single-layer graphene not yet been well understood, possibly due to technical difficulties in handling individual sheet. Here, we report behavior at graphene-based electrodes, comparing basal plane its edge. The edge showed 4...
Transparent conductive film on plastic substrate is a critical component in low-cost, flexible, and lightweight optoelectronics. Industrial-scale manufacturing of high-performance transparent flexible needed to enable wide-ranging applications. Here, we demonstrate continuous roll-to-roll (R2R) production based metal nanowire network fully encapsulated between graphene monolayer substrate. Large-area grown Cu foil via R2R chemical vapor deposition process was hot-laminated onto nanowires...
We report the epitaxial formation of bilayer Bernal graphene on copper foil via chemical vapor deposition. The self-limit effect growth is broken through introduction a second process. coverage regions with stacking can be as high 67% before further optimization. Facilitated transfer process to silicon/silicon oxide substrates, dual-gated transistors as-grown were fabricated, showing typical tunable characteristics under varying gate voltages. high-yield layer-by-layer epitaxy scheme will...
Layered-structure nanoribbons with efficient electron transport and short lithium ion insertion lengths are promising candidates for Li battery applications. Here we studied at the single nanostructure level chemical, structural, electrical transformations of V2O5 nanoribbons. We found that transformation into omega-Li3V2O5 phase depends not only on width but also thickness Transformation can take place within 10 s in thin nanoribbons, suggesting a diffusion constant 3 orders magnitude...
Abstract: Research on two-dimensional (2D) materials has been explosively increasing in last seventeen years varying subjects including condensed matter physics, electronic engineering, science, and chemistry since the mechanical exfoliation of graphene 2004. Starting from graphene, 2D now have become a big family with numerous members diverse categories. The unique structural features physicochemical properties make them one class most appealing candidates for wide range potential...
We report the covalent functionalization of graphene by photochemical chlorination. The gas-phase photochlorination graphene, followed structural transformation C-C bonds from sp(2) to sp(3) configuration, could remove conducting π-bands and open up a band gap in graphene. X-ray photoelectron spectroscopy revealed that chlorine is grafted basal plane with about 8 atom % coverage. Raman spectroscopy, atomic force microscopy, transmission electron microscopy all indicated photochlorinated...
Two-dimensional (2D) layered hybrid perovskites of (RNH3)2PbX4 (R is an alkyl and X a halide) have been recently synthesized exhibited rich optical properties including fluorescence exciton effects. However, few studies on transport optoelectronic measurements individual 2D perovskite crystals reported, presumably owing to the instability issue during electronic device fabrications. Here we report first photodetector based (C4H9NH3)2PbBr4 crystals, built with protection top contact graphene...
Topological insulator (TI) represents an unconventional quantum phase of matter with insulating bulk bandgap and metallic surface states. Recent theoretical calculations photoemission spectroscopy measurements show that Group V-VI materials Bi2Se3, Bi2Te3 Sb2Te3 are TI a single Dirac cone on the surface. These have anisotropic, layered structures, in which five atomic layers covalently bonded to form quintuple layer, interact weakly through van der Waals interaction crystal. A few these...
Bi2Se3 is a topological insulator with metallic surface states residing in large bulk bandgap. It believed that gets additional n-type doping after exposure to atmosphere, thereby reducing the relative contribution of total conductivity. In this letter, transport measurements on nanoribbons provide evidence such environmental process. Systematic composition analyses by X-ray photoelectron spectroscopy reveal fast formation and continuous growth native oxide under ambient conditions. addition...
Recent theoretical calculations and photoemission spectroscopy measurements on the bulk Bi2Se3 material show that it is a three-dimensional topological insulator possessing conductive surface states with nondegenerate spins, attractive for dissipationless electronics spintronics applications. Nanoscale materials have large surface-to-volume ratio can manifest are promising candidates devices. Here we report synthesis characterization of high quality single crystalline nanomaterials variety...
Nonlinear effects in two-dimensional (2D) atomic layered materials have recently attracted increasing interest. Phenomena such as nonlinear optical edge response, chiral electroluminescence, and valley spin currents beyond linear orders opened up a great opportunity to expand the functionalities potential applications of 2D materials. Here we report first observation strong second-harmonic generation (SHG) monolayer GaSe under nonresonant excitation emission condition. Our experiments show...