A5103106496- Graphene research and applications
- 2D Materials and Applications
- Advancements in Battery Materials
- Semiconductor materials and devices
- MXene and MAX Phase Materials
- Supercapacitor Materials and Fabrication
- Graphene and Nanomaterials Applications
- Thermal properties of materials
- Diamond and Carbon-based Materials Research
- ZnO doping and properties
- Advanced Battery Materials and Technologies
- Nanopore and Nanochannel Transport Studies
- Mechanical and Optical Resonators
- Advancements in Semiconductor Devices and Circuit Design
- Molecular Junctions and Nanostructures
- Quantum and electron transport phenomena
- Advanced Memory and Neural Computing
- Advanced Sensor and Energy Harvesting Materials
- Nanowire Synthesis and Applications
- Photonic and Optical Devices
- Advanced Battery Technologies Research
- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Electron and X-Ray Spectroscopy Techniques
- Advanced Photocatalysis Techniques
Tianjin Normal University
2019-2025
Shanghai University
2025
Materials Science & Engineering
2025
Tianjin International Joint Academy of Biomedicine
2021
Technical University of Denmark
2016-2019
Ørsted (Denmark)
2016-2019
University of Cambridge
2017-2019
Beijing National Laboratory for Molecular Sciences
2012-2017
Chinese Academy of Sciences
2012-2017
Institute of Chemistry
2012-2017
The ability to dope graphene is highly important for modulating electrical properties of graphene. However, the current route synthesis N-doped by chemical vapor deposition (CVD) method mainly involves high growth temperature using ammonia gas or solid reagent melamine as nitrogen sources, leading with low doping level, polycrystalline nature, defect density and carrier mobility. Here, we demonstrate a self-assembly approach that allows single-layer, single crystal nitrogen-doped domain...
An anisotropic etching mode is commonly known for perfect crystalline materials, generally leading to simple Euclidean geometric patterns. This principle has also proved apply the of thinnest material, graphene, resulting in hexagonal holes with zigzag edge structures. Here we demonstrate first time that graphene can deviate significantly from etching. Using an as-grown film on a liquid copper surface as model system, show etched pattern be modulated complex fractal patterns sixfold symmetry...
By using two-stage, metal-catalyst-free chemical vapor deposition (CVD), it is demonstrated that high-quality polycrystalline graphene films can directly grow on silicon nitride substrates. The carrier mobility reach about 1500 cm2 V−1 s−1, which three times the value of those grown SiO2/Si substrates, and also better than some examples metal-catalyzed graphene, reflecting good quality lattice. As a service to our authors readers, this journal provides supporting information supplied by...
Plasmonic biosensing has emerged as the most sensitive label-free technique to detect various molecular species in solutions and already proved crucial drug discovery, food safety studies of bio-reactions. This relies on surface plasmon resonances ~50 nm metallic films possibility functionalize metal order achieve selectivity. At same time, metals corrode bio-solutions, which reduces quality factor darkness plasmonic thus sensitivity. Furthermore, functionalization itself might have a...
We demonstrate a simple method for transferring large areas (up to A4-size sheets) of CVD graphene from copper foils onto target substrate using commercially available polyvinyl alcohol polymer foil as carrier and commercial hot-roll office laminator. Through the use terahertz time-domain spectroscopy Raman spectroscopy, large-area quantitative optical contrast mapping, fabrication electrical characterization ∼50 individual centimeter-scale van der Pauw field effect devices, we show...
Bacterial infections in wounds and bacteremia present significant global health challenges, driving the urgent need for innovative alternatives to traditional antibiotics. Here, development of PEI-EDTA-2Na carbon quantum dots (PECDs) synthesized via a hydrothermal method is reported. Synthesis conditions affect PECDs' antibacterial efficacy; those at 180 °C have optimal -NH2 functionalization better adhesion activity. PECDs are pH - responsive, eradicating bacteria weakly acidic by...
The controlled fabrication of single-crystal twelve-pointed graphene grains is demonstrated for the first time by ambient pressure chemical vapor deposition on a liquid Cu surface. An edge-diffusion limited mechanism proposed. highly controllable growth presents an intriguing case fundamental study and should exhibit wide applications in graphene-based electronics.
Graphene growth and etching are reciprocal processes that can reach a dynamic balance during chemical vapor deposition (CVD). Most commonly, the of graphene is dominate process, while recessive process often neglected CVD graphene. We show here through rational design low-pressure in hydrogen-diluted methane regulation flow rate H2, effect could be prominent even shows macroscopic selectivity. On this basis, etching-controlled synthesis with various morphologies from compact to dendritic...
We investigate the nucleation defect-triggered oxidation of Cu covered by CVD graphene during postannealing in air. The results reveal that different growth conditions may induce imperfect graphene, and cause creation defects near point such as pin holes amorphous carbon. These would serve a pathway for diffusion O2 thermal annealing, allowing to progress gradually from center toward edge. process follows morphology closely; shape oxidized area has striking resemblance flakes. Our work...
The precisely controllable growth of self‐aligned single‐crystal graphene grains on liquid Cu surface by ambient pressure chemical vapor deposition is reported. Large scale monolayer arrays are modulated varying conditions such as flow rate carbon source, temperature, and time. Further, bilayer also controllably prepared under optimized conditions. self‐alignment mechanism studied a model proposed to explain that process involving tension phase. In all, the firstly probed grown show...
Hierarchical graphene architectures (HGAs) that grow by stacking of layers are produced on a liquid copper surface using chemical vapor deposition. The mode — for example hexagonal–hexagonal–hexagonal or hexagonal–snowflake–dendritic can be simply controlled. Measurements the electrical properties HGAs indicate hierarchical may simple and effective way tailoring their without degrading them.
Large-area aligned hexagonal graphene arrays are directly fabricated by an in situ etching method. With precise control over the size, shape, and orientation, technique allows hydrogen to be employed as effective etchant on chemical vapor deposited leads ordered nanostructures. This direct top-down approach can enable atomically construction of integrated devices from single sheets with a wide range technological applications. As service our authors readers, this journal provides supporting...
Silicon monoxide (SiO) holds great potential as a next-generation anode material for commercial lithium-ion batteries due to its high theoretical specific capacity. However, poor cycling stability and low initial Coulombic efficiency (ICE) present substantial challenges practical application. Herein, we modified the structure of SiO through ball milling, followed by heating with addition network modifier Li2CO3. The submicrometer-sized reduces Li+ diffusion pathways within bulk, facilitating...
Uniform single-crystal graphene domains were synthesized on copper foils by atmospheric pressure chemical vapor deposition with activated carbon dioxide (CO2). Controlled growth of a shape evolution from hexagonal to round has been achieved varying the flow rate CO2. The excess CO2 passivation induced domain morphology transformation was systematically studied. Field-effect transistors fabricated based our CO2-derived and their electrical properties measured both in air N2. maximum fitted...
Abstract The pace of two-dimensional materials (2DM) research has been greatly accelerated by the ability to identify exfoliated thicknesses down a monolayer from their optical contrast. Since this process requires time-consuming and error-prone manual assignment avoid false-positives image features with similar contrast, efforts towards fast reliable automated assignments schemes is essential. We show that modelling expected 2DM contrast in digitally captured images, we can automatically...
Large-area AB stacked bilayer graphene layers with layer-resolved growth were successfully fabricated through dynamic pressure chemical vapor deposition.
Previous attempts to tune the electrical properties of large-scale graphene via nanopatterning have led serious degradation key parameters that make a desirable material for electronic devices. We use thermal nanoimprint lithography pattern wafer-scale on 4-in. wafer with prefabricated 25 mm2 The process introduces modest decrease in carrier mobility and only minor change residual doping. Due rapid fabrication time approximately 90 min per wafer, this method has potential industrial...
A sublimated sulfur vapor <italic>versus</italic> evaporated MoO<sub>3</sub> with transition from low to high supersaturation would cause different CVD products transformed MoS<sub>2</sub>–MoO<sub>3−x</sub> composites clean and pure MoS<sub>2</sub> crystals accordingly.
Graphene metrology needs to keep up with the fast pace of developments in graphene growth and transfer. Terahertz time-domain spectroscopy (THz-TDS) is a non-contact, fast, non-destructive characterization technique for mapping electrical properties graphene. Here we show several case studies on range different substrates that highlight versatility THz-TDS measurements its relevance process optimization production scenarios.
Abstract A novel Sn(OH) 4 /mesocarbon microbeads (MCMB) anode material has been successfully prepared by skillfully encapsulating the nanoparticles into micropores of MCMB via a simple vapor deposition approach. The electrochemical results demonstrate that /MCMB exhibits high reversible capacity 904 mAh g −1 after 500 cycles at current density 100 mA , which is far higher than SnO 2 (501 ) and Sn/MCMB (364 ). Such transcendence can be attributed to ultrasmall sizes rapid lithium ions...
We show the suppression of nucleation density in chemical vapor deposited graphene through use a sputtered metal coating on exterior copper catalyst enclosure, resulting growth sub-centimeter scale single crystal domains and complete elimination multilayer growth. The suppresses by acting as both diffusion barrier sink for excess carbon during growth, reducing concentration interior enclosure. Field effect mobility hBN-templated devices fabricated from grown this way room temperature carrier...