A5101540858- Advanced Electron Microscopy Techniques and Applications
- Magnetic properties of thin films
- Magnetic Properties of Alloys
- Integrated Circuits and Semiconductor Failure Analysis
- Electron and X-Ray Spectroscopy Techniques
- Gold and Silver Nanoparticles Synthesis and Applications
- Near-Field Optical Microscopy
- Semiconductor materials and devices
- Plasmonic and Surface Plasmon Research
- Supercapacitor Materials and Fabrication
- Magnetic Properties and Applications
- Aerogels and thermal insulation
- Thermal properties of materials
- Quantum and electron transport phenomena
- Video Analysis and Summarization
- Quantum Dots Synthesis And Properties
- Ion-surface interactions and analysis
- Force Microscopy Techniques and Applications
- Advancements in Semiconductor Devices and Circuit Design
- Thermography and Photoacoustic Techniques
- Industrial Technology and Control Systems
- Magnesium Alloys: Properties and Applications
- Visual perception and processing mechanisms
- Wind Turbine Control Systems
- Spectroscopy and Quantum Chemical Studies
Argonne National Laboratory
2019-2025
Jiangxi University of Science and Technology
2021-2024
Center for Nanoscale Materials
2022-2023
Xi'an Aeronautical University
2023
Nanosc (Sweden)
2022
Hunan Institute of Technology
2021
Hebei Academy of Sciences
2017
Hebei Normal University
2017
California Institute of Technology
2012-2016
Peking University
2016
Combined in situ small- and wide-angle X-ray scattering (SAXS/WAXS) studies were performed a new laboratory setup to investigate the dynamical properties of ruthenium/spinel (Ru/MgAl2O4) catalyst, w(Ru) = 4 wt %, during reduction subsequent dry methane reforming. The Ru particles fresh catalyst sample found be partially oxidized. High-resolution transmission electron microscopy (HRTEM) indicated coexistence pure RuO2 nanoparticles. Reduction hydrogen occurred at temperature between 373 393...
The effect of digital transformation on enterprise technological innovation is reflected in quantity and quality, which may show heterogeneity. In this regard, paper uses the data China’s A-share agricultural listed companies from 2015 to 2020 compare differential impact perspective quality innovation. Firstly, Tobit model used test whether there are differences enterprises, heterogeneity tested according nature enterprises. Secondly, explores reasons has different effects through mechanism...
Significance In this contribution, we demonstrate a unique concept in the use of photon-induced near-field electron microscopy—combining one pulse and two optical pulses—as probe for ultrafast dynamics matter microscopy. Photon–electron coupling permits short to gate pulse, which is serving as triggered by another pulse. This technique provides high spatial temporal resolution laser pulses, respectively, both microscopy (UEM) measurements. development paves way numerous studies imaging not...
Hybrids of graphene and metal plasmonic nanostructures are promising building blocks for applications in optoelectronics, surface-enhanced scattering, biosensing, quantum information. An understanding the coupling mechanism these hybrid systems is vital importance to its applications. Previous efforts this field mainly focused on spectroscopic studies strong within hybrids with no spatial resolution. Here we report direct imaging local between single Au nanocapsules step edges at nanometer...
Phonon dynamics and transport determine how heat is utilized dissipated in materials. In 2D systems for optoelectronics thermoelectrics, the impact of nanoscale material structure on phonon propagation central to controlling thermal conduction. Here, we directly observe in-plane coherent acoustic black phosphorus (BP) using ultrafast electron microscopy. We identify a significant reduction group velocities directions intermediate armchair zigzag lattice directions. Using machine...
Gold (Au) nanostars are plasmonic nanostructures possessing potentials for small molecule detection, photocatalytic activities, and photothermal therapy. However, Au synthesized in the traditional way often plagued by poor photo, thermal, chemical stabilities. Here, we report an unconventional route to synthesis of ultrastable colloidal enabled bottlebrush-like block copolymers (BBCPs), dispensing with need seeds. Crafting using BBCPs is rendered bridging latter Au3+ ions as cross-linkers...
Significance One of the most significant advances made is ability to visualize nanoscale objects and determine their shapes (through imaging) atomic-scale structure diffraction). Furthermore, for optical excitation nanostructure photon-induced near-field EM (PINEM) imaging results in mapping plasmonics with high spatial–temporal resolution. Here, we show that PINEM can be exploited infrared region greater sensitivity, diffraction implemented structural dynamics. Just as importantly, time...
In this Letter, we introduce conical-scanning dark-field imaging in four-dimensional (4D) ultrafast electron microscopy to visualize single-particle dynamics of a polycrystalline ensemble undergoing phase transitions. Specifically, the metal-insulator transition vanadium dioxide is induced using laser excitation and followed by taking electron-pulsed, time-resolved images diffraction patterns. The selectivity achieved identifying origin all constituent Bragg spots on Debye-Scherrer rings...
Synthesis of crystallographically well-defined thin films topological materials is important for unraveling their mesoscale quantum properties and device applications. Mn$_3$Ge, an antiferromagnetic Weyl semimetal with a chiral magnetic structure on Kagome lattice, expected to have enhanced Berry curvature around nodes near the Fermi energy, leading large anomalous Hall / Nernst effects spin-Hall effect. Using magnetron sputtering, we grown epitaxial hexagonal D0$_{19}$ Mn$_3$Ge that are...
One-dimensional nanostructure growth behaves very differently on the ± (0001) polar surfaces of wurtzite ZnO, resulting in asymmetric these two directions. In this report we show that by tuning degree supersaturation, asymmetry can either be rationally utilized or broken to obtain single- double-sided ZnO nanocombs, respectively. The nanowires grown nanocombs are comparable length, suggesting some kind symmetric growth, but they distributed sides an manner. More interestingly, nanocomb...
Abstract The phase transition of crystalline ordering is a general phenomenon, but its evolution in space and time requires microscopic probes for visualization. Here we report direct imaging the transformation amorphous titanium dioxide nanofilm, from liquid state, passing through nucleation step finally to ordered crystal phase. Single-pulse transient diffraction profiles at different times provide structural specific degree crystallinity ( η ) process. It found that temporal behaviour...
Organic monolayers of epoxy-containing oligo(ethylene oxide)s were grafted to the surface silicon nanoparticles via a hydrosilylation reaction. The functional groups suppressed chemical and electrochemical reactivity as-grown lithiated with high material utilization. A robust Si/electrolyte interphase was formed participation organic facilitated Li+ transfer further enforced by electrode integrity epoxy/poly(acrylic acid) (PAA) binder improved cycling stability post-test analysis indicate...
The objectives of this study were to examine whether the temporal Doppler effect exists in different time intervals and certain individual environmental factors act as moderators effect. Using hierarchical linear modeling, we examined existence moderating future orientation among 139 university students (Study 1), then conditions using two independent samples 143 147 (Studies 2 3). Results indicated that existed all our studies, moderated Further, interval perception mediated relationship...
Strong spin-lattice coupling in van der Waals (vdW) magnets shows potential for innovative magneto-mechanical applications. Here, nanoscale and picosecond imaging by ultrafast electron microscopy reveal heterogeneous spin-mediated coherent acoustic phonon dynamics a thin-film cavity of the vdW antiferromagnet FePS3. The harmonics interlayer shear modes are observed, which even odd exhibit distinct nanoscopic dynamics. Corroborated wave simulation, role defects forming is elucidated. Above...
Significance Imaging of dynamical processes in materials and biological structures requires resolutions both space time. Four-dimensional electron microscopy was developed to image microscopic objects down the atomic-scale spatial resolution femtosecond time resolution. Unlike stroboscopic techniques applied studies reversible on scale, single-pulse methods have been limited nanosecond scale for capturing irreversible such as phase transformations. In this contribution, we report 4D...
Due to the multi-variable, strong coupling, nonlinear and time-varying characteristics of induction motor, it is not easy for direct torque control (DTC) system with traditional PID controller get ideal performance. In order improve performance Direct Torque Control system, a fuzzy regulator motor speed proposed adjust variable. According principle DTC, model DTC constructed simulation implemented. comparison regulator, shows that more effective in improving response stability system.
A nickel/spinel (Ni/MgAl2O4) catalyst, w(Ni) = 22 wt %, was investigated in situ during reduction with wide-angle X-ray scattering (WAXS) a laboratory setup and anomalous small-angle (ASAXS) at synchrotron source. Complementary high-resolution transmission electron microscopy (HRTEM) performed on the fresh catalyst sample. The Ni particles sample were observed to exhibit Ni/NiO core-shell structure. decrease of lattice parameter is temperature interval from 413 453 K, which can be related...