A5072776839- Ferroelectric and Piezoelectric Materials
- Multiferroics and related materials
- Advanced Sensor and Energy Harvesting Materials
- Dielectric materials and actuators
- Physics of Superconductivity and Magnetism
- Microwave Dielectric Ceramics Synthesis
- Acoustic Wave Resonator Technologies
- Innovative Energy Harvesting Technologies
- Superconducting Materials and Applications
- Advanced ceramic materials synthesis
- Dielectric properties of ceramics
- Superconductivity in MgB2 and Alloys
- Photonic and Optical Devices
- Rare-earth and actinide compounds
- Energy Harvesting in Wireless Networks
- Magnetic and transport properties of perovskites and related materials
- Engineering Applied Research
- Magnetic properties of thin films
- Conducting polymers and applications
- Photorefractive and Nonlinear Optics
- Wireless Power Transfer Systems
- Advanced Condensed Matter Physics
- ZnO doping and properties
- Thin-Film Transistor Technologies
- Gas Sensing Nanomaterials and Sensors
Inha University
2016-2025
Convergence
2025
Pennsylvania State University
2001-2023
Stanford University
2023
Gachon University
2023
Korea Electrotechnology Research Institute
2000-2022
Chosun University
2022
Incheon Medical Center
2015-2020
National Institute of Ecology
2019
Yeungnam University
2019
Abstract Dielectric capacitors, which store electrical energy in the form of an electrostatic field via dielectric polarization, are used pulsed power electronics due to their high density and ultrashort discharge time. In pursuit developing high‐performance special attention has been given improvement storage efficiency, would make them useful for even wider variety applications. Among different materials studied so far, including polymers, glasses, both bulk film‐based ceramics, ceramic...
A novel energy capturing technique for wasted parasitic magnetic noise based upon a magneto-mechano-electric (MME) generator, consisting of piezoelectric single crystal fibers and Ni metal plate in the form cantilever structure.
We report on the observation of an orthorhombic ferroelectric phase in 0.67Pb(Mg1/3Nb2/3)O3–0.33PbTiO3 single crystals, whose polarization is along 〈011〉 direction and stability can be altered by poling conditions. studied piezoelectric properties poled both monodomain polydomain states, found that d32 coefficient, which response perpendicular to direction, positive cases. Based phenomenological theory, we show this possible a crystal with electrostrictive coefficients Q11>Q44–Q12.
Energy harvesting from the weak magnetic fields based on magneto-mechano-electric (MME) effect is quite promising for powering low power consumption electronics.
We demonstrate a microscale vibration energy harvester exhibiting an ultra-low resonance frequency and high power density. A spiral shaped microelectromechanical system (MEMS) was designed to harvest ambient vibrations at low (<;200 Hz) acceleration (<;0.25 g). High quality Pb(Zr <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.48</sub> Ti xmlns:xlink="http://www.w3.org/1999/xlink">0.52</sub> )O...
A MME generator with a textured Fe–Ga alloy can generate over 1 mW power under tiny magnetic field.
An improved magnetic energy harvesting with magneto-mechano-electric (MME) generator is demonstrated by low-loss piezoelectric single-crystal fibers composite to realize a self-powered electronics. The MME can generate voltage of 94 V pp and current 120 μA (corresponding an output root mean square power density 2.1 mW cm−3). As service our authors readers, this journal provides supporting information supplied the authors. Such materials are peer reviewed may be re-organized for online...
Among the various forms of natural energies, heat is most prevalent and least harvested energy. Scavenging detecting stray thermal energy for conversion into electrical can provide a cost-effective reliable source modern appliances sensor applications. Along with this, flexible devices have attracted considerable attention in scientific industrial communities as wearable implantable harvesters addition to traditional This review mainly discusses through pyroelectric phenomena lead-free well...
We report the giant electrocaloric effect (ECE) of BaZr0.2Ti0.8O3 (BZT) thick film near room temperature. The BZT was fabricated by tape casting method with thickness 12.0 μm. Due to invariant critical point composition, relaxor behavior, and stress generated between substrate, exhibits a large adiabatic temperature drop ΔT = −7 °C under 19.5 MV/m electric field, EC coefficient ΔT/ΔE 0.50 × 10−6 K · m V−1, ΔS/ΔE 0.88 J kg−1 K−1 V−1 over wide range temperature, where ΔS is isothermal entropy...
Relaxor ferroelectrics (RFEs) are being actively investigated for energy-storage applications due to their large electric-field-induced polarization with slim hysteresis and fast energy charging-discharging capability. Here, a novel nanograin engineering approach based upon high kinetic deposition is reported, mechanically inducing the RFE behavior in normal ferroelectric Pb(Zr0.52 Ti0.48 )O3 (PZT), which results simultaneous enhancement dielectric breakdown strength (EDBS ) polarization....
In this study, we present and demonstrate a new route to great enhancement in resolution of surface plasmon resonance sensors. Basically, our approach combines waveguide coupled plasmonic mode kind Au/Ag bimetallic concept. Theoretical modeling was carried out by solving Fresnel equations for the multilayer stack prism/Ag inner-metal layer/dielectric waveguide/Au outer-metal layer. The inner Ag layer couples incident light guided wave makes more fields effectively concentrated on outer Au...
Here we review the current status of magnetoelectric (ME) multiferroics and ME composite thin/thick films. The magnitude coupling in systems is dependent upon elastic occurring at interface piezoelectric magnetostrictive phases. multiferroic films comparison with bulk composites have some unique advantages show higher response. In films, thickness one important factors to enough signal. However, most all reported nanocomposite structured literature are limited overall which might be related...
Abstract In addition to the rapid urbanization and industrialization around world, air pollution due particulate matter is a substantial threat human health. A considerable research effort has been devoted development of electrospun polymer nanofibers for filter applications. Among these new technologies, electrostatic charge‐assisted filtration promising technology removing small (PM). this investigation, biodegradable poly( l ‐lactic acid) (PLLA) are employed Electrostatic charges...
Dielectric ceramic film capacitors, which store energy in the form of electric polarization, are promising for miniature pulsed power electronic device applications. For a superior storage performance large recoverable density, along with high efficiency, fast charge/discharge rate, and good thermal/fatigue stability, is desired. Herein, we present highly dense lead-free 0.942[Na0.535K0.480NbO3]-0.058LiNbO3 (KNNLN) ferroelectric thick films (∼5 μm) demonstrating remarkable performance. The...
The electrocaloric effect (ECE), which refers to changes in the temperature of a material when an electric field is applied or removed from material, one key phenomena future highly efficient solid-state refrigeration devices.
We report the physical behavior of self-biased multi-functional magneto-mechano-electric (MME) laminates simultaneously excited by magnetic and/or mechanical vibrations. The MME composed Ni and single crystal fiber composite exhibited strong ME coupling under Hdc = 0 Oe at both low frequency resonance frequency. Depending on field direction with respect to orientation, energy harvester showed in-plane anisotropy in output voltage was found generate open circuit 20 Vpp power density 59.78...
A magneto-mechano-electric (MME) generator comprising a magnetoelectric (ME) composite and magnetic flux concentrator (MFC) can effectively harvest the tiny noise to power autonomous internet of things (IoT) sensor networks.
Flexible self-charging capacitor systems, which exhibit the combined functions of energy generation and storage, are considered a promising solution for powering flexible self-powered electronics. Here, we present new approach to demonstrate self-charging, ultrafast, high-power-density (SUHP) system by integrating an aerosol-deposited nanograined relaxor ferroelectric Pb(Mg1/3Nb2/3)O3–PbTiO3 (PMN–PT) piezoelectric Pb(Zrx,Ti1–x)O3 (PZT) harvester. The as-designed SUHP can generate electric...
Polycrystalline Pb(Zr0.52Ti0.48)O3 (PZT) thick films (thickness ∼10 μm) were successfully fabricated by using a novel aerosol deposition technique on Si wafer, sapphire, and single crystal yitria stabilized zirconia (YSZ) wafer substrates with Pt electrodes their dielectric, ferroelectric, piezoelectric properties, in-plane stresses investigated. The different stress conditions simply controlled the coefficient of thermal expansion (CTE) misfit PZT substrates. results showed that bearing...
We report the realization of a multiple, broadband, magnetoelectric (ME) response using Ni/[011]-Pb(Mg1/3Nb2/3)O3-Pb(Zr,Ti)O3 (PMN-PZT) single crystal/Ni laminates that take advantage multiple mechanical resonances inherent to with anisotropic piezoelectric properties. The ME voltage coefficient showed three distinct resonance frequencies and large in-plane anisotropy in its sign magnitude owing planar [011]-oriented PMN-PZT crystals. Upon serially connecting such different thickness ratios...
Magnetoelectric (ME) rectangular unimorph cantilever beam structures of piezoelectric Pb(Mg1/3Nb2/3)O3-Pb(Zr,Ti)O3 (PMN-PZT) single crystal on magnetostrictive Ni plate was designed with ⟨001⟩ and ⟨011⟩-cut crystallographic directions investigated their ME response mechanical vibration based energy harvesting behavior. Both magnetoelectric voltage coefficient (αME) mechanically harvested power output found to be strongly dependent the cut PMN-PZT crystals. The maximum αME 7.28 V/cm Oe 1.31...
By tailoring the truncated shape of a cantilever structured magneto-mechano-electric (MME) generator that is composed piezoelectric single crystal fiber composite and magnetostrictive Ni plate, superior output harvesting power density over 680% was obtained as compared to typical rectangular shaped generator. The effect MME generator's on strain distribution induced by magnetostriction vibration characteristics properties were simulated finite element analysis modeling confirmed...