A5101787975- Molecular Junctions and Nanostructures
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Quantum and electron transport phenomena
- Graphene research and applications
- Catalytic Cross-Coupling Reactions
- Surface Chemistry and Catalysis
- Polymer crystallization and properties
- Crystallization and Solubility Studies
- Magnetic properties of thin films
- Polymer Nanocomposites and Properties
- X-ray Diffraction in Crystallography
- Cyclopropane Reaction Mechanisms
- biodegradable polymer synthesis and properties
- Rheology and Fluid Dynamics Studies
- Gold and Silver Nanoparticles Synthesis and Applications
- Copper-based nanomaterials and applications
- Synthetic Organic Chemistry Methods
- Characterization and Applications of Magnetic Nanoparticles
- Topological Materials and Phenomena
- Quantum Dots Synthesis And Properties
- Ferroelectric and Negative Capacitance Devices
- Hydrology and Watershed Management Studies
- Graphene and Nanomaterials Applications
- Magnetic Field Sensors Techniques
- Quantum-Dot Cellular Automata
National Center for Nanoscience and Technology
2021-2025
University of Chinese Academy of Sciences
2017-2025
Hefei University of Technology
2025
North China Electric Power University
2024
China Electric Power Research Institute
2024
CeNTech
2018-2022
University of Münster
2018-2022
Pittsburgh Quantum Institute
2017-2019
University of Pittsburgh
2017-2019
Institute of Physics
2014-2017
The Kondo effect, a widely studied phenomenon in which the scattering of conduction electrons by magnetic impurities increases as temperature T is lowered, depends strongly on density states at Fermi energy. It has been predicted theory that free-standing monolayer graphene exhibit effect and control level external means can be used to switch off. However, though transport data for Co adatoms monolayers several substrates have reported, there exists no evidence effect. Here we probe role...
Hot electron processes at metallic heterojunctions are central to optical-to-chemical or electrical energy transduction. Ultrafast nonlinear photoexcitation of graphite (Gr) has been shown create hot thermalized electrons temperatures corresponding the solar photosphere in less than 25 fs. Plasmonic resonances nanoparticles also known efficiently generate electrons. Here we deposit Ag nanoclusters (NC) on Gr study ultrafast generation and dynamics their plasmonic by means time-resolved...
Abstract The structural properties and binding motif of a strongly σ‐electron‐donating N‐heterocyclic carbene have been investigated on different transition‐metal surfaces. examined cyclic (alkyl)(amino)carbene (CAAC) was found to be mobile surfaces, molecular islands with short‐range order could at high coverage. A combination scanning tunneling microscopy (STM), X‐ray photoelectron spectroscopy (XPS), density functional theory (DFT) calculations highlights how CAACs bind the surface, which...
A molecular rotor based on N-heterocyclic carbenes (NHCs) has been rationally designed following theoretical predictions, experimentally realized, and characterized. Utilizing the structural tunability of NHCs, a computational screening protocol was first applied to identify NHCs with asymmetric rotational potentials surface as prerequisite for unidirectional rotors. Suitable candidates were then synthesized studied using scanning tunneling microscopy/spectroscopy (STM/STS), analytical...
Self-assembly of cyclohexyl cyclic (alkyl)(amino)carbenes (cyCAAC) can be realized and reversibly switched from a close-packed trimer phase to chainlike dimer phase, enabled by the ring-flip wingtip. Multiple methods including scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS) density functional theory (DFT) calculations identified distinct isomer (axial or equatorial chair conformer) in each consequently support conclusion regarding determination molecular surface...
Alkali atoms are known to promote or poison surface catalytic chemistry. To explore alkali promotion of catalysis and characterize discharge species in alkali-oxygen batteries, we examine coadsorption K O2 on Au(111) at the atomic scale by scanning tunneling microscopy (STM) density functional theory (DFT). On a clean surface, molecules may weakly physisorb, but when is decorated with K+ ions, they chemisorb into structures that depend adsorbate concentrations substrate templating. At low...
The strongly electron-donating N-heterocyclic imines (NHIs) have been employed as excellent surface anchors for the thermodynamic stabilization of electron-deficient species due to their enhanced nucleophilicity. However, binding mode and interfacial property these new ligands are still unclear, representing a bottleneck advanced applications in functionalization catalysis. Here, NHIs with different side groups rationally designed, synthesized, analyzed on various metal surfaces (Cu, Ag)....
We report the dielectric and viscoelastic relaxations in undiluted amorphous poly(d,l-lactic acid) (PLA). Three designated as αn, αs, β are observed order of decreasing temperature. The relaxation time for αn increases with increasing molecular weight is assigned to normal mode due component dipole vector aligned direction parallel chain contour. αs about 30 K above glass transition temperature Tg (= 310 K) local segmental transverse monomeric dipoles. seen glassy state secondary relaxation....
We investigated the thermal and dielectric behavior of blends consisting semicrystalline poly(l-lactic acid) (L-87) amorphous poly(dl-lactic (DL-74 DL-7). Two series L-87/DL-74 coded as B1 L-87/DL-7 B2 were used where code number indicates molecular weight Mw in kg/mol. The DSC thermograms quenched exhibited a single glass transition at about 326 K followed by exothermic peak due to crystallization L-87. relatively sharp that both components are miscible molten state. degree crystallinity χ...
Surface modification through the formation of a self-assembled monolayer (SAM) can effectively engineer physicochemical properties surface/material. However, precise design multifunctional SAMs at molecular level is still major challenge. Here, we jointly use N-heterocyclic carbenes (NHCs) and thiols to form hetero-SAM systems that demonstrate excellent chemical stability, electrical conductivity, and, in silico, catalytic activity. This synergistic effect facilitated by high surface...
As a critical intervention for enhancing inland navigation efficiency, waterway regulation projects profoundly modify riverine hydrodynamic conditions while optimizing navigability. This study employs the MIKE21 model to establish two-dimensional numerical framework assessing hydrological alterations induced by channel in Hui River, China. Through comparative simulations of pre- and post-project scenarios across dry, normal, wet years, research quantifies impacts on water levels, flow...
Exploration of immunosuppressive agents for the treatment diabetes is a burgeoning field that has captured attention medical community. The innovative approach using these to combat driven by their diverse capabilities regulate immune system, which pivotal disease pathogenesis. primary objective enhance management blood glucose levels, critical factor in daily life diabetic patients. This comprehensive review delves into therapeutic horizons opened agents, particularly potential impact on...
A low power 1 Mb Magnetoresistive Random Access Memory (MRAM) based on a 1-Transistor and 1-Magnetic Tunnel Junction (1T1MTJ) bit cell is demonstrated. This the largest MRAM memory demonstration to date. In this circuit, MTJ elements are integrated with CMOS using copper interconnect technology. The interconnects cladded high permeability layer which used focus magnetic flux generated by current flowing through lines toward devices reduce needed for programming bits. 25 mm/sup 2/ circuit...
The DFT optimized 44BEP on metal (M) surfaces. change of binding energy (<italic>E</italic><sub>b</sub>) and distances (<italic>d</italic><sub>Br_sub</sub> <italic>d</italic><sub>N_sub</sub>) different surfaces will bring configurations self-assembling behaviours.
Different interatomic spin interactions in graphene-regulated Mn atomic clusters are investigated by low-temperature scanning tunneling microscopy and magnetic-field-dependent inelastic excitation spectroscopy. All dimers observed exhibit an antiferromagnetic (AFM) singlet ground state transition from the to triplet states, but their AFM coupling strength shows a unique dependence on site registration graphene. Intriguing can be found graphene-mediated trimers, which manifest multilevel...
Abstract A series of Pt(II) complexes with tetradentate luminophores has been designed, synthesized, and deposited on coinage metal surfaces the aim to produce highly planar self‐assembled monolayers. Low‐temperature scanning tunneling microscopy (STM) density functional theory (DFT) calculations reveal a significant initial nonplanarity for all complexes. subsequent metal‐catalyzed separation nonplanar moiety at bridging unit via scission C−N bond is observed, leaving behind largely core...
In marginally twisted bilayer graphene, the Moiré pattern consists of maximized AB (BA) stacking regions, minimized AA regions and triangular networks domain walls. Here we realize strain-modulated electronic structures graphene by scanning tunneling microscopy/spectroscopy density functional theory (DFT) calculations. The experimental data show four peaks near Fermi energy at regions. DFT calculations indicate that two new closer to level may originate from intrinsic heterostrain electric...
A low power 4Mb Magnetoresistive Random Access Memory (MRAM) with a new magnetic switching mode is presented for the first time. The memory cell based on 1-Transistor 1-Magnetic Tunnel Junction (1TIMTJ) bit cell. MRAM circuit was designed in five level metal, 0.18/spl mu/m CMOS process size of 1.55/spl mu/m/sup 2/. architecture, structure, and improve operational performance as compared to conventional MRAM. largest demonstration date.
Real graphene sheets show limited anti-permeation performance deviating from the ideally flat honeycomb carbon lattice that is impermeable to gases. Ripples in are prevalent and they could significantly influence carrier transport. However, little attention has been paid role of ripples permeation properties graphene. Here, we report gases can permeate through at room temperature. The feasibility gas determined by detecting initial oxidation sites Cu surface covered with isolated domain....
Abstract Die strukturellen Eigenschaften und das Bindungsmotiv eines stark σ‐elektronenschiebenden N‐heterocyclischen Carbens werden an verschiedenen Übergangsmetalloberflächen erforscht. Das untersuchte cyclische (Alkyl)(amino)carben (CAAC) erweist sich auf Oberflächen als mobil, bei hoher Bedeckung konnten molekulare Inseln mit Nahordnung gefunden werden. Durch die Kombination von Rastertunnelmikroskopie (STM), Röntgenphotoelektronenspektroskopie (XPS) Dichtefunktionaltheorie (DFT) zeigt...
The atomic-scale spatial relationship of a two-impurity Kondo system has been determined at varying lateral distance by scanning tunneling microscopy (STM) and spectroscopy. localized spins two cobalt magnetic adatoms that are placed on different electrodes an STM form individual singlet states, each showing quite coupling, i.e., the tip-Kondo with low temperature sample-Kondo high temperature. differential conductance dI/dV spectra show continuous changes resonance peak feature when...