A5100412987- Ferroelectric and Piezoelectric Materials
- Multiferroics and related materials
- Acoustic Wave Resonator Technologies
- Electronic and Structural Properties of Oxides
- Advanced Sensor and Energy Harvesting Materials
- Advanced Photocatalysis Techniques
- Magnetic and transport properties of perovskites and related materials
- Microbial Metabolic Engineering and Bioproduction
- Catalytic Processes in Materials Science
- Biofuel production and bioconversion
- BIM and Construction Integration
- TiO2 Photocatalysis and Solar Cells
- Conducting polymers and applications
- Enzyme Structure and Function
- Surface Modification and Superhydrophobicity
- biodegradable polymer synthesis and properties
- Microwave Dielectric Ceramics Synthesis
- Additive Manufacturing and 3D Printing Technologies
- Biodiesel Production and Applications
- Dielectric materials and actuators
- Structural Engineering and Vibration Analysis
- Perovskite Materials and Applications
- Supercapacitor Materials and Fabrication
- China's Socioeconomic Reforms and Governance
- Enzyme Production and Characterization
University of California, Berkeley
2017-2025
Korea Advanced Institute of Science and Technology
2005-2025
University of Wisconsin–Madison
2023-2024
Research Institute of Industrial Science and Technology
2024
Seoul National University
2015-2024
Chung-Ang University
2024
Pukyong National University
2023
Myongji University
2019-2022
Ulsan National Institute of Science and Technology
2021-2022
University of California System
2021
Defect-enhanced energy storage Dielectric capacitors are vital components of electronics and power systems. The thin-film materials which composed usually optimized by changing the material composition. However, Kim et al. found that postprocessing an already effective dielectric high-energy ion bombardment further improved because introduction specific types defects ultimately performance. results suggest may be important for developing next generation capacitors. Science , this issue p. 81
Innovative sound absorbers, the design of which is based on carbon nanotubes and graphene derivatives, could be used to make more efficient absorbing materials because their excellent intrinsic mechanical chemical properties. However, controlling directional alignments low-dimensional nanomaterials, such as restacking, alignment, dispersion, has been a challenging problem when developing forms. Herein, we present directionally antagonistic oxide-polyurethane hybrid aerogel developed...
Strain engineering in perovskite oxides provides for dramatic control over material structure, phase, and properties, but is restricted by the discrete strain states produced available high-quality substrates. Here, using ferroelectric BaTiO3 , production of precisely strain-engineered, substrate-released nanoscale membranes demonstrated via an epitaxial lift-off process that allows high crystalline quality films grown on substrates to be replicated. In turn, fine structural tuning achieved...
Leveraging competition between energetically degenerate states to achieve large field-driven responses is a hallmark of functional materials, but routes such are limited. Here, new route effects involving domain-structure demonstrated, which arises from strain-induced spontaneous partitioning PbTiO3 thin films into nearly degenerate, hierarchical domain architectures coexisting c/a and a1 /a2 structures. Using band-excitation piezoresponse force microscopy, this study manipulates...
Abstract The importance of hydrogen peroxide (H 2 O ) continues to grow globally. Deriving the oxygen reduction reaction (ORR) toward 2e – pathway form H is crucial for high productivity. However, most selective electrocatalysts following comprise carbon‐containing organic materials with intrinsically low stability, thereby limiting their commercial applicability. Herein, layered double hydroxides (LDHs) are used as inorganic matrices first time. LDH catalyst developed herein exhibits...
Polyhydroxyalkanoates (PHAs) are natural polyesters synthesized by numerous microorganisms as energy and reducing power storage materials, have attracted much attention substitutes for petroleum-based plastics. In an accompanying paper, the authors reported crystal structure of C-terminal domain Ralstonia eutropha PHA synthase (PhaC1). Here, report 3D reconstructed model full-length R. PhaC1 (RePhaC1F ) small angle X-ray scattering (SAXS) analysis. The catalytic RePhaC1 (RePhaC1CD dimer is...
Antiferroelectric PbZrO3 is being considered for a wide range of applications where the competition between centrosymmetric and noncentrosymmetric phases important to response. Here, we focus on epitaxial growth thin films understanding chemistry–structure coupling in Pb1+δZrO3 (δ = 0, 0.1, 0.2). High-quality, single-phase are synthesized via pulsed-laser deposition. Although no significant lattice parameter change observed X-ray studies, electrical characterization reveals that while...
Understanding and ultimately controlling the large electromechanical effects in relaxor ferroelectrics requires intimate knowledge of how local-polar order evolves under applied stimuli. Here, biaxial-strain-induced evolution correlations between polar structures properties epitaxial films prototypical ferroelectric 0.68PbMg1/3 Nb2/3 O3 -0.32PbTiO3 are investigated. X-ray diffuse-scattering studies reveal an from a butterfly- to disc-shaped pattern increase correlation-length ≈8 ≈25 nm with...
Understanding the microscopic origin of superior electromechanical response in relaxor ferroelectrics requires knowledge not only atomic-scale formation polar nanodomains (PNDs) but also rules governing arrangements and stimulated PNDs over longer distances. Using x-ray coherent nanodiffraction, we show staggered self-assembly into unidirectional mesostructures that refer to as laminates ferroelectric 0.68PbMg1/3Nb2/3O3-0.32PbTiO3 (PMN-0.32PT). We reveal highly heterogeneous...
The effect of intrinsic point defects on relaxor properties 0.68 ${\mathrm{PbMg}}_{1/3}{\mathrm{Nb}}_{2/3}{\mathrm{O}}_{3}\text{\ensuremath{-}}0.32$ ${\mathrm{PbTiO}}_{3}$ thin films is studied across nearly 2 orders magnitude defect concentration via ex post facto ion bombardment. A weakening the character observed with increasing bombardment-induced defects, which hypothesized to be related strong interactions between dipoles and polarization. Although more structural disorder are...
Zwitterionic polyether brushes bearing mussel-inspired catechol moieties are developed for versatile coatings with improved antifouling properties on biomedical surfaces.
KTaO 3 heterostructures have recently attracted attention as model systems to study the interplay of quantum paraelectricity, spin-orbit coupling, and superconductivity. However, high low vapor pressures potassium tantalum present processing challenges creating heterostructure interfaces clean enough reveal intrinsic properties. Here, we report superconducting based on high-quality epitaxial (111) thin films using an adsorption-controlled hybrid PLD overcome pressure mismatch. Electrical...
Recent advances in high-throughput computational workflows are expanding the realm of materials for a range applications. Here, we report experimental evaluation two such predicted candidate ferroelectric perovskite oxides: BiAlO3 and BiInO3. Attempts were made to synthesize polar BiInO3 using pulsed-laser deposition. Despite exploring wide temperatures, pressures, substrates, laser fluences, so on, attempts grow with this approach resulted no phase decomposition Bi2O3 Bi24Al2O40. Various...
Abstract Liquid metals (LMs) and alloys are attracting increasing attention owing to their combined advantages of high conductivity fluidity, have shown promising results in various emerging applications. Patterning technologies using LMs being actively researched; among them, direct ink writing is considered a potentially viable approach for efficient LM additive manufacturing. However, true manufacturing with arbitrary printing geometries remains challenging because the intrinsically low...
To promote the photoelectric conversion efficiency of dye-sensitized solar cells (DSSCs), graphene is introduced as a working electrode with <TEX>$TiO_2$</TEX> in this study, because it has great transparency and very good conductivity. XRD patterns indicate presence particles graphene-linked samples. Moreover, TEM pictures also show that nano-sized are highly dispersed well-linked onto thin layered graphene. On basis UV-visible spectra, band gaps <TEX>$TiO_2$</TEX>, 1.0 wt %...
This study highlights efforts to develop an accurate, simple methodology assess the electromechanical response in thin-film heterostructures, using laser Doppler vibrometry measuring surface displacements smaller than 1 nm. The work demonstrates how use measured values extract piezoelectric coefficient ${d}_{33}$ for a generic system by means of finite-element modeling. Finally, shows figure merit thin films, and offers procedure compare them their bulk counterparts via coupling ${k}_{33}$.