A5074247589- Solid State Laser Technologies
- Laser-Matter Interactions and Applications
- Graphene research and applications
- Molecular Junctions and Nanostructures
- Laser Design and Applications
- Nanopore and Nanochannel Transport Studies
- Fullerene Chemistry and Applications
- Advanced Chemical Physics Studies
- Laser-Plasma Interactions and Diagnostics
- Laser Material Processing Techniques
- Quantum and electron transport phenomena
- Optical Systems and Laser Technology
- Plasmonic and Surface Plasmon Research
- Surface and Thin Film Phenomena
- Ion-surface interactions and analysis
- Surface Chemistry and Catalysis
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Diamond and Carbon-based Materials Research
- Force Microscopy Techniques and Applications
- Advanced Fiber Laser Technologies
- Photonic Crystals and Applications
- Advanced biosensing and bioanalysis techniques
- Advanced Materials Characterization Techniques
- 2D Materials and Applications
Institute of Physics
2014-2024
Chinese Academy of Sciences
2014-2024
University of Chinese Academy of Sciences
2018-2024
Songshan Lake Materials Laboratory
2019-2024
Shanghai Institute of Optics and Fine Mechanics
2013-2024
National Laboratory for Superconductivity
2024
Collaborative Innovation Center of Quantum Matter
2014-2023
Academia Sinica
2021
Czech Academy of Sciences, Institute of Physics
2012-2019
Tsinghua University
1998-2012
Carbon dots (CDs) have significant potential for use in various fields including biomedicine, bioimaging, and optoelectronics. However, inefficient excitation emission of CDs both near-infrared (NIR-I NIR-II) windows remains an issue. Solving this problem would yield improvement the tissue-penetration depth vivo bioimaging with CDs. Here, NIR absorption band enhanced fluorescence are realized through surface engineering CDs, exploiting electron-acceptor groups, namely molecules or polymers...
We have developed an efficient chemical exfoliation approach for the high-throughput synthesis of solution-processable, high-quality graphene sheets that are noncovalently functionalized by alkylamine. Purely coherent nonlinear optical response these has been investigated, using near-infrared, visible, and ultraviolet continous wave ultrafast laser beams. Spatial self-phase modulation unambiguously observed in solution dispersions. Our results suggest this light scattering is due to a...
We have used scanning tunneling microscopy and spectroscopy to study the electronic structure of individual ${\mathrm{C}}_{60}$ molecules adsorbed onto Au(111) Ag(100) surfaces. on show an increase in HOMO-LUMO gap 0.6 eV compared Ag(100). Splitting LUMO manifold is suppressed for Au(111), contrast strong splitting observed Our data implies a intramolecular Coulomb energy as Topographs energy-resolved spectral maps, however, nearly identical features indicate similar influence two substrates...
We have used scanning tunneling spectroscopy to spatially map the energy-resolved local density of states individual ${\mathrm{C}}_{\mathrm{60}}$ molecules on Ag(100) surface. Spectral maps were obtained for molecular derived from HOMO, LUMO, and $\mathrm{L}\mathrm{U}\mathrm{M}\mathrm{O}+1$ orbitals, revealing new details inhomogeneous electronic structure. Spatial inhomogeneities are explained using ab initio pseudopotential functional calculations. These calculations emphasize need...
Organometal halide perovskite solar cells (PSCs) have emerged as one of the most promising photovoltaic technologies with efficiencies exceeding 20.3%. However, device stability problems including hysteresis in current–voltage scans must be resolved before commercialization PSCs. Transient absorption measurements and first-principles calculations indicate that migration oxygen vacancies TiO2 electrode under electric field during voltage contributes to anomalous The accumulation at...
Ultra-thin solid-state nanopore with good wetting property is strongly desired to achieve high spatial resolution for DNA sequencing applications. Atomic thick hexagonal boron nitride (h-BN) layer provides a promising two-dimensional material fabricating nanopores. Due its oxidation resistance, the hydrophilicity of h-BN device can be significantly improved by UV-Ozone treatment. The contact angle KCl-TE droplet on reduced from 57° 26° after Abundant translocation events have been observed...
Abstract The recently discovered novel properties of two dimensional materials largely rely on the layer-critical variation in their electronic structure and lattice symmetry. Achieving layer-by-layer precision patterning is thus crucial for junction fabrications device engineering, which hitherto poses an unprecedented challenge. Here we demonstrate laser thinning with a (2D) quantum material MoS 2 . Monolayer, bilayer trilayer films are produced precise vertical lateral control, removes...
Adsorption structure of Eosin Y dyes on nanocrystalline TiO2 can be manipulated by adding a small fraction water into organic electrolyte. Binding mode switching from hydrogen bonded monodentate to bidentate bridging configuration has been observed and confirmed Raman infrared spectroscopy measurements, with vibration peaks assigned using density functional theory calculations. Photovoltaic measurements the fabricated dye-sensitized solar cells indicate that energy conversion efficiency is...
We have spatially resolved the local electronic structure of a ${\mathrm{C}}_{60}$ monolayer on Ag(001) using scanning tunneling spectroscopy at $T=7\mathrm{K}.$ Our measurements resolve four band states derived from highest occupied molecular orbital, lowest unoccupied orbital (LUMO), and LUMO+1. observe spatial inhomogeneity in energy-resolved density states, which reflects internal structure. In addition, we are able to orientation coexisting bright dim molecules monolayer. This...
Second-harmonic generation (SHG) from periodic arrays of subwavelength rectangular air hole with various aspect ratios perforated in gold thin films can get resonantly enhanced for some specific geometric shapes. Here we clarify the physical origin this shape resonance effect. A nonlinear coupled-mode theory is set up to solve energy conversion fundamental wave (FW) mode second-harmonic (SHW) within nanoscale hole. It reveals that several mechanisms, including FW excitation amplitude, FW-SHW...
We report the synthesis and systematic Raman study of twisted bilayer graphene (tBLG) with rotation angles from below 10° to nearly 30°. Chemical vapor deposition was used grow hexagon-shaped tBLG a angle that can be conveniently determined by relative edge misalignment. Rotation dependent G-line resonances folded phonons were observed selecting suitable energies excitation lasers. The phonon frequencies superlattices agree well our ab initio calculation.
We have measured the elastic and inelastic tunneling properties of isolated $\mathrm{Gd}@{\mathrm{C}}_{82}$ molecules on Ag(001) using cryogenic scanning spectroscopy. find that dominant channel is spatially well localized to a particular region molecule. Ab initio pseudopotential density-functional theory calculations indicate this arises from vibrational cage mode. further show observed localization explained by strong in molecular electron-phonon coupling
Abstract Many remarkable properties of graphene are derived from its large energy window for Dirac-like electronic states and have been explored applications in electronics photonics. In addition, strong electron-phonon interaction has led to efficient photo-thermo conversions, which harnessed applications. By combining the wavelength independent absorption property conversion, here we report a new type sound wave generation underlined by photo-thermo-acoustic conversion mechanism. Most...
Adsorption geometry of dye molecules on nanocrystalline TiO2 plays a central role in dye-sensitized solar cells, enabling effective sunlight absorption, fast electron injection, optimized interface band offsets, and stable photovoltaic performance. However, precise determination binding proportion has been challenging due to complexity sensitivity at interfaces. Here employing combined vibrational spectrometry density functional calculations, we identify typical adsorption configurations...
Revealing the nature of a hydrogen-bond network in water structures is one imperative objectives science. With use low-temperature scanning tunneling microscope, clusters on Au(111) surface were directly imaged with molecular resolution by functionalized tip. The internal as well geometry variations increase size identified. In contrast to buckled hexamer predicted previous theoretical calculations, our results present deterministic evidence for flat configuration hexamers Au(111),...
Nanopores have emerged as highly sensitive biosensors operating at the single-molecule level. However, majority of nanopore experiments still rely on averaging signals from multiple molecules, introducing systematic errors. To overcome this limitation and obtain accurate information a single molecule, molecular ping-pong methodology provides precise approach involving repeated captures molecule. In study, we enhanced technique by incorporating customized electronic system control algorithm,...
The rotation dynamics of single magnesium porphine molecules on an ultrathin NaCl bilayer is investigated with low-temperature scanning tunneling microscopy and density functional theory calculations. It observed that the rotational oscillation between two stable orientations can be turned off by molecular charge state, which manipulated electrons. features states mechanism on/off state control are revealed at atomic scale. dependence orientation switching rate electron energy current...
A high power laser system was used to drive the ignition of inertial confinement fusion (ICF), which energy, uniform focal spot, accurate waveform, and synchronization between beams are key parameters. To accomplish this, global characteristics control should be assured, main purpose injection system. In this paper, technological progress involved in improvement performance SG-II is reported, including frequency domain control, time near-field spatial shaping, pre-amplifier technology,...
Superhydrophobic (SHO) surfaces have drawn great attention thanks to their theoretical significance and myriad applications in industry everyday life. Current approaches fabricate such require calcinating at high temperatures, tedious time‐consuming treatments, toxic chemicals, and/or processing with intricate instruments. Long‐duration SHO are even more challenging due material instability easy contamination by organic pollutants dry conditions. To overcome these difficulties we design a...
We report the observation of a strong 2D band Raman in twisted bilayer graphene (tBLG) with large rotation angles under 638 nm and 532 visible laser excitations. The intensity increased four-fold as opposed to two-fold increase observed single-layer graphene. same tBLG samples also exhibited rotation-dependent G-line resonances folded phonons 364 UV excitation. attribute this enhancement constructive interference between two double-resonance pathways, which were enabled by nearly degenerate...
Abstract The dynamic structural behavior in DNA due to interaction with cisplatin is essential for the functionality of platinum-based anti-cancer drugs. Here we report a novel method monitor progress DNA-cisplatin reaction real time solid-state nanopore. processes are found be well elucidated by evolution capture rate complex, which defined as number their translocation events through nanopore unit time. In first stage, decreases rapidly discharging positive-charged hydrated molecules...
"Molecular ping-pong," emerging as a control strategy in solid-state nanopore technology, presents highly promising approach for repetitive measurements of single biomolecules, such DNA. This paper introduces high-precision, high-speed molecular ping-pong system consisting home-built trans-impedance amplifier (TIA), based on Field Programmable Gate Array (FPGA), and LabVIEW program operating the host personal computer. Through feedback compensation post-stage boosting, TIA achieves high...