A5100744048- Mechanical and Optical Resonators
- Photonic and Optical Devices
- Advanced MEMS and NEMS Technologies
- Acoustic Wave Resonator Technologies
- Force Microscopy Techniques and Applications
- 2D Materials and Applications
- Advanced Fiber Laser Technologies
- Graphene research and applications
- Photonic Crystals and Applications
- Carbon Nanotubes in Composites
- ZnO doping and properties
- Craniofacial Disorders and Treatments
- Perovskite Materials and Applications
- Gas Sensing Nanomaterials and Sensors
- Quantum Dots Synthesis And Properties
- Ga2O3 and related materials
- Analytical Chemistry and Sensors
- Cleft Lip and Palate Research
- GaN-based semiconductor devices and materials
- Facial Trauma and Fracture Management
- Microfluidic and Capillary Electrophoresis Applications
- Advanced Chemical Sensor Technologies
- Microfluidic and Bio-sensing Technologies
- Diamond and Carbon-based Materials Research
- Conducting polymers and applications
University of Central Florida
2023-2025
Florida College
2025
Hannam University
2013-2024
University of Florida
2007-2024
Daegu Gyeongbuk Institute of Science and Technology
2024
Texas A&M University
2023
Korea University
2021-2023
The University of Texas at El Paso
2022-2023
Case Western Reserve University
2013-2022
Baystate Medical Center
2019-2022
Molybdenum disulfide (MoS2), a layered semiconducting material in transition metal dichalcogenides (TMDCs), as thin monolayer (consisting of hexagonal plane Mo atoms covalently bonded and sandwiched between two planes S atoms, trigonal prismatic structure), has demonstrated unique properties strong promises for emerging two-dimensional (2D) nanodevices. Here we report on the demonstration movable vibrating MoS2 nanodevices, where diaphragms 6 nm (a stack 9 monolayers) exhibit...
We characterized the differentiation of rat bone marrow-derived mesenchymal stem cells (BM-MSCs) into tenocyte-like in response to morphogenetic protein-12 (BMP-12). BM-MSCs were prepared from Sprague-Dawley rats and cultured as monolayers. Recombinant BMP-12 treatment (10 ng/ml) for 12 hours vitro markedly increased expression tenocyte lineage markers scleraxis (Scx) tenomodulin (Tnmd) over 14 days. Treatment with a further 12-hour period had no additional effect. Colony formation assays...
Atomically thin semiconductor resonators vibrating at radio frequencies with exceptional tunability and broad dynamic range.
Abstract Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is most commonly used as an anode buffer layer in bulk-heterojunction (BHJ) polymer solar cells (PSCs). However, its hygroscopic and acidic nature contributes to the insufficient electrical conductivity, air stability restricted photovoltaic (PV) performance for fabricated PSCs. In this study, a new multifunctional additive, 2,3-dihydroxypyridine (DOH), has been PEDOT: PSS obtain modified properties PSS@DOH achieve...
Emerging atomic layer semiconducting crystals such as molybdenum disulfide (MoS2) are promising candidates for flexible electronics and strain-tunable devices due to their ultrahigh strain limits (up ∼20–30%) bandgaps. However, high levels, controllable isotropic anisotropic biaxial strains in single- few-layer MoS2 on device-oriented substrates permitting convenient fast tuning, remain unexplored. Here, we demonstrate a "blown-bubble" bulge technique efficiently applying large substrate. As...
We demonstrate a high-Q amorphous silicon carbide (a-SiC) microresonator with optical Q as high 1.3 × 10(5). The quality allows us to characterize the third-order nonlinear susceptibility of a-SiC. Kerr nonlinearity is measured be n2 = (5.9 ± 0.7) 10(−15) cm(2)/W in telecom band around 1550 nm. strong and render a-SiC microresonators promising platform for integrated photonics.
Atomic layers of hexagonal boron nitride (h-BN) crystal are excellent candidates for structural materials as enabling ultrathin, two-dimensional (2D) nanoelectromechanical systems (NEMS) due to the outstanding mechanical properties and very wide bandgap (5.9 eV) h-BN. In this work, we report experimental demonstration h-BN 2D nanomechanical resonators vibrating at high frequencies (from ~5 ~70 MHz), investigations elastic by measuring multimode resonant behavior these devices. First,...
We report on experimental measurement of air damping effects in high frequency nanomembrane resonators made atomically thin molybdenum disulfide (MoS2) drumhead structures. Circular MoS2 nanomembranes with thickness monolayer, few-layer, and multi-layer up to ∼70 nm (∼100 layers) exhibit intriguing pressure dependence resonance characteristics. In completely covered drumheads, where there is no immediate equilibrium between the drum cavity environment, frequencies quality (Q) factors...
The unique negative thermal expansion coefficient and remarkable stability of graphene make it an ideal candidate for nanoelectromechanical systems (NEMS) with electrothermal tuning. We report on the first experimental demonstration electrothermally tuned single- few-layer NEMS resonators operating in high frequency (HF) very (VHF) bands. In single-, bi-, trilayer (1L, 2L, 3L) carefully controlled Joule heating, we have demonstrated remarkably broad tuning up to Δ f/ f0 ≈ 310%....
We demonstrate a silicon carbide (SiC) microdisk resonator with an intrinsic optical quality factor of 6.19×10(3), fabricated on the 3C-SiC-on-Si platform. characterize temperature dependence cavity resonance and obtain thermo-optic coefficient 2.92×10(-5)/K for 3C-SiC. Our simulations show that device exhibits great potential optomechanical applications.
The ambient environmental instability and degradation mechanism of single- few-layer WTe2 are investigated. Oxidation W Te atoms appears to be a main reason for degradation. Single-layer samples' Raman signals disappear within 20 min in air. Few-layer exhibits saturating behavior: only the top layer is oxidized; degraded can protect inner layers from further
We demonstrate a silicon carbide (SiC) microdisk resonator with optical Q up to 5.12 × 104. The high quality, together the diversity of whispering-gallery modes and tunability external coupling, renders SiC promising platform for integrated quantum photonics applications.
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We report on the demonstration of atomic layer van der Waals (vdW) heterostructure photodiodes operating in visible regime, enabled by stacking single- to few-layer n-type molybdenum disulfide (MoS2) top p-type gallium selenide (GaSe) crystals. The vdW photodiode exhibits an excellent photoresponsivity ∼3A/W at wavelength 532 nm when symmetric graphene (FLG) contacts with low contact resistance are used. On other hand, for a GaSe/MoS2 asymmetric GaSe/FLG and MoS2/gold (Au) contacts, very...
We demonstrate the first-ever surface modification of green CdSe/ZnS quantum dots (QDs) using bromide anions (Br-) in cetyl trimethylammonium (CTAB). The Br- ions reduced interparticle spacing between QDs and induced an effective charge balance QD light-emitting devices (QLEDs). fabricated QLEDs exhibited efficient injection because emission quenching effect their enhanced thin film morphology. As a result, they maximum luminance 71,000 cd/m2 external current efficiency 6.4 cd/A, both...
Hexagonal boron nitride (h-BN), one of the hallmark van der Waals (vdW) layered crystals with an ensemble attractive physical properties, is playing increasingly important roles in exploring two-dimensional (2D) electronics, photonics, mechanics, and emerging quantum engineering. Here, we report on demonstration h-BN phononic crystal waveguides designed pass stop bands radio frequency (RF) range controllable wave propagation transmission, by harnessing arrays coupled nanomechanical...
Abstract The experimental demonstration of aluminum scandium nitride (AlScN)‐on‐cubic silicon carbide (SiC) heterostructure thin film micromachined resonant transducers operating in a high‐temperature environment up to 600 °C is reported. Macroscopic and microscopic vibrations are investigated through combination ultrasensitive laser interferometry techniques Raman spectroscopy. An average linear temperature coefficient resonance frequency (TC f ) <1 ppm −1 within the range from room 200...
We report on the first experimental demonstrations of phononic frequency comb (PnFC) generation in atomically thin molybdenum disulfide (MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) nanoelectromechanical systems (NEMS) vibrating near ~20MHz and ~50MHz high (HF) very (VHF) bands. Frequency patterns are generated by tuning two resonance modes with gate voltage ( <inline-formula xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math...
Phononic waveguides (PnWGs) are devices with rationally designed periodic structures to manipulate mechanical oscillations and engineer control the propagation of acoustic waves, thus allowing for frequency band selection wave transmission routing, promising both classical quantum transduction on chip-scale platforms various constituent materials interest. They can be incorporated into electromechanical optomechanical signal schemes. Here, we present an overview emerging micro/nanoscale...