A5061416325- Electron and X-Ray Spectroscopy Techniques
- Ion-surface interactions and analysis
- Advanced Electron Microscopy Techniques and Applications
- Semiconductor materials and devices
- Fluid Dynamics and Thin Films
- Luminescence Properties of Advanced Materials
- Metal and Thin Film Mechanics
- Integrated Circuits and Semiconductor Failure Analysis
- Diamond and Carbon-based Materials Research
- Graphene research and applications
- nanoparticles nucleation surface interactions
- Electronic and Structural Properties of Oxides
- High-Temperature Coating Behaviors
- Advanced Materials Characterization Techniques
- 2D Materials and Applications
- Ferroelectric and Piezoelectric Materials
- Gold and Silver Nanoparticles Synthesis and Applications
- High Entropy Alloys Studies
- ZnO doping and properties
- Multiferroics and related materials
- Plasmonic and Surface Plasmon Research
- Force Microscopy Techniques and Applications
- Thin-Film Transistor Technologies
- Quantum Dots Synthesis And Properties
- Nanofabrication and Lithography Techniques
University of Tennessee at Knoxville
2016-2025
Knoxville College
2006-2024
Louisiana State University
2024
Oak Ridge National Laboratory
2014-2023
Center for Nanophase Materials Sciences
2007-2021
ORCID
2021
Stanford University
2009-2020
University of Tennessee System
2020
Oak Ridge Associated Universities
2015-2020
Thermo Fisher Scientific (United States)
2019-2020
Most studied two-dimensional (2D) materials exhibit isotropic behavior due to high lattice symmetry; however, lower-symmetry 2D such as phosphorene and other elemental very interesting anisotropic properties. In this work, we report the atomic structure, electronic properties, vibrational modes of few-layered PdSe2 exfoliated from bulk crystals, a pentagonal layered noble transition metal dichalcogenide with puckered morphology that is air-stable. Micro-absorption optical spectroscopy...
Focused electron-beam-induced (FEB-induced) deposition and etching are versatile, direct-write nanofabrication schemes that allow for selective or removal of a variety materials. Fundamentally, these processes governed by an electron-induced reaction with precursor vapor, which may either result in decomposition to solid deposit formation volatile etch by-product. The ability induce such localized reactions placement nanometer-sized focused electron probe has recently drawn considerable...
Inappropriate activation of the Hedgehog (Hh) signaling pathway has been implicated in a diverse spectrum cancers, and its pharmacological blockade emerged as an anti-tumor strategy. While nearly all known Hh antagonists target transmembrane protein Smoothened (Smo), small molecules that suppress downstream effectors could more comprehensively remediate pathway-dependent tumors. We report here four are epistatic to nucleocytoplasmic regulator Suppressor Fused [Su(fu)], including two can...
Laser-induced graphene (LIG) is a multifunctional foam that commonly direct-written with an infrared laser into carbon-based precursor material. Here, visible 405 nm used to directly convert polyimide LIG. This enabled the formation of LIG spatial resolution ∼12 μm and thickness <5 μm. The by relatively smaller focused spot size represents >60% reduction in feature sizes reported prior publications. process occurs situ SEM chamber, thus allowing direct observation formation. reduced features...
Carbon nanofibers are high-aspect ratio graphitic materials that have been investigated for numerous applications due to their unique physical properties such as high strength, low density, metallic conductivity, tunable morphology, chemical and environmental stabilities, well compatibility with organochemical modification. Surface studies extremely important nanomaterials because not only is the surface structurally chemically quite different from bulk, but its tend dominate at nanoscale...
A nanoscale, synthetic perturbation was all that required to nudge a natural, self-assembly process toward significantly higher order. Metallic thin film strips were transformed into nanoparticle arrays by nanosecond, liquid-phase dewetting. Arrays formed according an evolving Rayleigh–Plateau instability, yet diameter and pitch poorly controlled. However, patterning nanoscale sinusoid onto the original strip edge, precise emerged superseding naturally instability.
The concept of high configurational entropy requires that the high-entropy alloys (HEAs) yield single-phase solid solutions. However, phase separations are quite common in bulk HEAs. A five-element alloy, CrCoCuFeNi, was deposited via radio frequency magnetron sputtering and confirmed to be a solution through high-energy synchrotron X-ray diffraction, energy-dispersive spectroscopy, wavelength-dispersive transmission electron microscopy. formation solid-solution is presumed due cooling rate...
Focused electron beam induced deposition (FEBID) is one of the few techniques that enables direct-write synthesis free-standing 3D nanostructures. While fabrication simple architectures such as vertical or curving nanowires has been achieved by trial and error, processing complex structures not tractable with this approach. In part, due to dynamic interplay between electron-solid interactions transient spatial distribution absorbed precursor molecules on solid surface. Here, we demonstrate...
During the past decade, significant progress has been made in field of resonant optics ranging from fundamental aspects to concrete applications. While several techniques have introduced for fabrication highly defined metallic nanostructures, synthesis complex, free-standing three-dimensional (3D) structures is still an intriguing, but so far intractable, challenge. In this study, we demonstrate a 3D direct-write approach that addresses Specifically, succeeded nanoarchitectures via...
Abstract Recent advances in growth techniques have enabled the synthesis of high-quality large area films 2D materials beyond graphene. As a result, nanofabrication methods must be developed for high-resolution and precise processing these atomically thin materials. These developments are critical both integration complex, integrated circuitry, as well creation sub-wavelength quantum-confined nanostructures devices which allow study novel physical phenomena. In this review, we summarize...
The effect that the gas content and plasma power of atmospheric, nonthermal has on invasion activity in colorectal cancer cells been studied. Helium helium plus oxygen plasmas were induced through a nozzle operated with an ac less than 10 kV which exhibited length 2.5 cm diameter 3–4 mm ambient air. Treatment jet resulted decrease cell migration/invasion higher intensity addition to He flow gas.
Abstract Atomically thin transition metal dichalcogenides (TMDs) are currently receiving significant attention due to their promising opto-electronic properties. Tuning optical and electrical properties of mono few-layer TMDs, such as tungsten diselenide (WSe 2 ), by controlling the defects, is an intriguing opportunity synthesize next generation two dimensional material devices. Here, we report effects focused helium ion beam irradiation on structural, WSe , via high resolution scanning...
Enabling memristive, neuromorphic, and quantum-based computing as well efficient mainstream energy storage conversion technologies requires the next generation of materials customized at atomic scale. This full control arrangement bonding in three dimensions. The last two decades witnessed substantial industrial, academic, government research efforts directed toward this goal through various lithographies scanning-probe-based methods. These emphasize 2D surface structures, with some limited...
Additive manufacturing of three-dimensional objects on the nanoscale is a very relevant topic but still highly challenging task. Among pool nanofabrication techniques, focused electron beam induced deposition (FEBID) has recently developed from trial-and-error laboratory method to predictable 3D nanoprinting technology with unique advantages. This perspective article first introduces basic principles 3D-FEBID, followed by an overview historical developments particular emphasis last three...
Two-dimensional (2D) palladium diselenide (PdSe2 ) has strong interlayer coupling and a puckered pentagonal structure, leading to remarkable layer-dependent electronic structures highly anisotropic in-plane optical properties. However, the lack of high-quality, 2D PdSe2 crystals grown by bottom-up approaches limits study their exotic properties practical applications. In this work, chemical vapor deposition growth crystalline few-layer (≥2 layers) on various substrates is reported. The high...
High-entropy alloys (HEAs) are inherently complex and potentially span a vast composition space, making their research discovery challenging. In the present study, high-throughput synthesis of an Alx(CoCrFeNi)100-x combinatorial material library covering x = 4.5–40 atomic percent Al is achieved, using magnetron co-sputtering. The effects on microstructure corrosion behavior investigated. With increased amount Al, crystal-structures thin films transform from face-centered cubic (FCC) to...
Focused electron beam induced deposition (FEBID) is an important synthesis method as it extremely flexible tool for fabricating functional (3D) structures with nanometer spatial resolution. However, FEBID has historically suffered from carbon impurities up to 90 at %, which significantly limits the intended functionalities. In this study we demonstrate that MeCpPtIVMe3 deposits can be fully purified by electron-beam assisted approach using H2O vapor room temperature, eliminates sample and/or...