A5007009594- 2D Materials and Applications
- Graphene research and applications
- Thermal properties of materials
- MXene and MAX Phase Materials
- Ion-surface interactions and analysis
- Perovskite Materials and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Quantum Dots Synthesis And Properties
- Fuel Cells and Related Materials
- Advanced Memory and Neural Computing
- Electrocatalysts for Energy Conversion
- Nanopore and Nanochannel Transport Studies
- Quantum, superfluid, helium dynamics
- Fusion materials and technologies
- Nuclear Materials and Properties
- Nuclear materials and radiation effects
- Chalcogenide Semiconductor Thin Films
- Non-Destructive Testing Techniques
- Conducting polymers and applications
- Boron and Carbon Nanomaterials Research
- Solid-state spectroscopy and crystallography
- Thermal Expansion and Ionic Conductivity
- Nuclear reactor physics and engineering
- Microstructure and mechanical properties
- Advancements in Photolithography Techniques
University of Virginia
2022-2024
Max Planck Institute for the Structure and Dynamics of Matter
2023
Center for Free-Electron Laser Science
2023
United States Naval Research Laboratory
2023
DEVCOM Army Research Laboratory
2023
United States Army Combat Capabilities Development Command
2023
Rice University
2023
Flatiron Health (United States)
2023
Cornell University
2023
Oak Ridge National Laboratory
2023
High-Entropy Alloys (HEAs) are proposed as materials for a variety of extreme environments, including both fission and fusion radiation applications. To withstand these harsh processing must be tailored to their given application, now achieved through additive manufacturing processes. However, application opportunities remain limited due an incomplete understanding the effects irradiation on HEA performance. In this letter, we investigate response additively manufactured refractory...
Abstract
We investigate the nature of strain in $\mathrm{Mo}{\mathrm{S}}_{2}$ and correlate it to defect types densities, while systematically assessing tolerance this low dimensional material He Au ion irradiations. Through a series theoretical predictions experimental observations, we establish onset crystalline-to-amorphous transition identify sulfur vacancies as most favorable defects introduced during irradiation. note presence both tensile compressive strains, which depend on into lattice vary...
Modeling time-series data with convolutional neural networks (CNNs) requires building a model to learn in batches as opposed training sequentially. Coupling CNNs situ or operando techniques opens the possibility of accurately segmenting dynamic reactions and mass transport phenomena understand how materials behave under conditions which they are used. In this article, ion irradiation transmission electron microscopy (TEM) images used inputs into CNN assess defect generation rate, cluster...
Abstract Surface acoustic waves (SAWs) propagate along solid-air, solid-liquid, and solid-solid interfaces. Their characteristics depend on the elastic properties of solid. Combining transmission electron microscopy (TEM) experiments with molecular dynamics (MD) simulations, we probe atomic environments around intrinsic defects that generate SAWs in vertically stacked two-dimensional (2D) bilayers MoS 2 . Our joint experimental-simulation study provides insights into SAW-induced structural...
2D materials, particularly transition metal dichalcogenides (TMDCs), have shown great potential for microelectronics and optoelectronics. However, a major challenge in commercializing these materials is the inability to effectively dope them at wafer scale with high spatial fidelity. We use interface chemistry underlying substrate oxide concomitant exposure visible light ambient conditions photo-dedoping MoS2. hypothesize that layer traps photoexcited holes, leaving behind long-lived...
Ultrathin MoS2 has shown remarkable characteristics at the atomic scale with an immutable disorder to weak external stimuli. Ion beam modification unlocks potential selectively tune size, concentration, and morphology of defects produced site impact in 2D materials. Combining experiments, first-principles calculations, atomistic simulations, transfer learning, it is that irradiation-induced can induce a rotation-dependent moiré pattern vertically stacked homobilayers by deforming atomically...
Abstract Understanding the emergent electronic structure in twisted atomically thin layers has led to exciting field of twistronics. However, practical applications such systems are challenging since specific angular correlations between must be precisely controlled and have single crystalline with uniform atomic ordering. Here, an alternative, simple, scalable approach is suggested, where nanocrystallinetwo‐dimensional (2D) film on 3D substrates yields twisted‐interface‐dependent...
Abstract Lateral heterostructures combining two multilayer group IV chalcogenide van der Waals semiconductors have attracted interest for optoelectronics, twistronics, and valleytronics, owing to their structural anisotropy, bulk‐like electronic properties, enhanced optical thickness, vertical interfaces enabling in‐plane charge manipulation/separation, perpendicular the trajectory of incident light. Group monochalcogenides support propagating photonic waveguide modes, but interference gives...
The thermal and radiation stability of free-standing ceramic nanoparticles that are under consideration as potential fillers for the improved polymeric matrices were investigated by a set transmission electron microscopy (TEM) studies. A series lanthanide-doped ceria (Ln:CeOx; Ln = Nd, Er, Eu, Lu) nanocubes/nanoparticles was characterized synthesized prior to inclusion into polymers. Ln:CeOx from different solution precipitation (oleylamine (ON), hexamethylenetetramine (HMTA) solvothermal...
Fabrication of transition metal dichalcogenide (TMD) quantum dots (QDs) is complex and requires submerging powders in binary solvents the constant tuning wavelength pulsed frequency light to achieve a desired reaction. Instead liquid state photoexfoliation, we utilize infrared laser irradiation free-standing MoS2 flakes transmission electron microscope (TEM) solid-state multi-level photoexfoliation QDs. By investigating steps involved photochemical reaction between surface beam, gain insight...
Abstract 2D materials, particularly transition metal dichalcogenides (TMDCs), have shown great potential for microelectronics and optoelectronics. However, a major challenge in commercializing these materials is the inability to control their doping at wafer scale with high spatial fidelity. Interface chemistry used underlying substrate oxide concomitant exposure visible light ambient conditions photo‐dedoping MoS 2 . It hypothesized that layer traps photoexcited holes, leaving behind...
In situ transmission electron microscopy (TEM) allows one to observe the structure of a material at unprecedented spatial resolution, while pushing away from equilibrium with an external stimulus [1].Of particular importance, it becomes possible probe subtle nanoscale reactions that dictate performance and lifetime material, including bubble coalescence, dislocation mobility, metal precipitation, defect annihilation.One main factors inhibiting our expansion knowledge pertaining degradation...
Understanding the emergent electronic structure in twisted atomically thin layers has led to exciting field of twistronics. However, practical applications such systems are challenging since specific angular correlations between must be precisely controlled and have single crystalline with uniform atomic ordering. Here, we suggest an alternative, simple scalable approach where nanocrystalline two-dimensional (2D) film on three-dimensional (3D) substrates yield twisted-interface-dependent...
<title>Abstract</title> Surface acoustic waves (SAWs) propagate along solid-air, solid-liquid and solid-solid interfaces. Their characteristics depend on the elastic properties of solid. Combining transmission electron microscopy (TEM) experiments with molecular dynamics (MD) simulations, we probe atomic environments around intrinsic defects that generate SAWs in vertically stacked two-dimensional (2D) bilayers MoS<sub>2</sub>. Our joint experimental-simulation study provides new insights...
between the CTE and amount of ZrO/sub 2/ present. Data are listed for comparison several other polycrystalline oxides investigated by Holcombe at Oak Ridge.