Article
Materials Science, Ceramics
Uros Hribar, Matjaz Spreitzer, Tadej Rojac, Jakob Konig
Summary: This study investigates the key aspects of synthesizing NBT-BT-KNN ceramics to achieve high S-max/E-max values, by destabilizing the ferroelectric order in the material through changing the composition. Results indicate that Na or Ti deficiency, or excess of Bi can decrease the ferroelectric-to-relaxor transition temperature and remnant polarization.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Multidisciplinary Sciences
Haijun Wu, Shoucong Ning, Moaz Waqar, Huajun Liu, Yang Zhang, Hong-Hui Wu, Ning Li, Yuan Wu, Kui Yao, Turab Lookman, Xiangdong Ding, Jun Sun, John Wang, Stephen J. Pennycook
Summary: The study demonstrates a new strategy in alkali niobate epitaxial films, utilizing alkali vacancies without alloying to form nanopillars enclosed with out-of-phase boundaries that can give rise to a giant electromechanical response. This approach provides a pathway to achieve large electromechanical response with good temperature stability in similar perovskite oxides.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Martin F. Sarott, Marta D. Rossell, Manfred Fiebig, Morgan Trassin
Summary: This study demonstrates the ability to continuously modulate the remanent polarization at the nanoscale in PbZr0.52Ti0.48O3 films by driving the system towards the instability at the morphotropic phase boundary, achieving multilevel switching.
NATURE COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Nan Zhang, Xiang Lv, Xi-xiang Zhang, Anyang Cui, Zhigao Hu, Jiagang Wu
Summary: By controlling the long-range ferroelectric ordering (LRFO) in lead-free piezoceramics, multifunctional properties such as increased piezoelectric coefficient and temperature-insensitive strain can be achieved. Low antimony doping maintains LRFO and results in multi-phase coexistence near room temperature, while high antimony doping leads to a relaxor phase transition.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Jin Soo Park, Soo Young Jung, Dong Hun Kim, Jung Ho Park, Ho Won Jang, Tae Geun Kim, Seung-Hyub Baek, Byung Chul Lee
Summary: Due to its additional frequency response, dual-frequency ultrasound is advantageous in providing ultrasound images with a large detection area and high resolution. This study introduces a novel method for generating dual-frequency ultrasound using a ferroelectric piezoelectric micromachined ultrasound transducer (PMUT). The ultrasound frequency can be switched by tuning a DC bias to control the polarization state of the ferroelectric film. This technique reduces the design complexity of transducer arrays and driving circuits.
MICROSYSTEMS & NANOENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Yuqing Zhou, Changqing Guo, Guohua Dong, Haixia Liu, Ziyao Zhou, Ben Niu, Di Wu, Tao Li, Houbing Huang, Ming Liu, Tai Min
Summary: In this study, zigzag wrinkle morphology was fabricated on inorganic thin films to modulate ferroelectric domains and create a superstructure with periodic surface charge distribution. This unique structure can be switched using strain gradient and provides a means to regulate cells and polar molecules in physiological and bioelectric applications.
Article
Chemistry, Physical
Farha Jabeen, Raza Shahid, M. Shahid Khan, Raghvendra Pandey
Summary: Lead-free 0.7BiFeO(3)-0.3BaT(i1-x)Mn(x)O(3) ceramics were prepared by adding MnO2 and their structural, spectral, electrical, magnetic, and piezoelectric properties were investigated. The results showed that the addition of MnO2 significantly enhanced the electrical and piezoelectric properties of the ceramics.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Muhammad Habib, Fazli Akram, Pervaiz Ahmad, F. F. Al-Harbi, Israf Ud Din, Qamar Iqbal, Tauseef Ahmed, Salman Ali Khan, Ali Hussain, Tae-Kwon Song, Myong-Ho Kim, Soonil Lee
Summary: Nb-modified lead-free BF-BT ceramics achieved excellent piezoelectric performance through chemical modification, including outstanding piezoelectric properties and relatively low piezoelectric strain hysteresis.
Article
Engineering, Electrical & Electronic
Shuai Cheng, Bo-Ping Zhang, Li-Jun Wang, Tao Yang, Chang-Lai Yuan, Chang-Rong Zhou, Guang-Hui Rao, Yang Yin
Summary: Enhanced piezoelectric and ferroelectric properties of tetragonal BF-33BT ceramics were achieved by tailoring sintering temperature and dwell time without MnO2 doping, showing that grain size, relative density, and oxygen vacancies play significant roles in their properties.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
Ekaterina Kondratyuk, Anastasia Chouprik
Summary: Ferroelectric polycrystalline HfO2 thin films are a promising material for novel non-volatile ferroelectric memories. This study proposes a new model of switching kinetics that successfully explains the observed retardation behavior in Hf0.5Zr0.5O2 (HZO)-based capacitors.
Article
Materials Science, Multidisciplinary
C. B. Pan, G. C. Zhao, S. M. Li, M. F. Shu, J. Wu, J. M. Z. Wang, L. H. Yin, W. H. Song, X. B. Zhu, J. Yang, Y. P. Sun
Summary: In this study, (1-x)CaBi2Nb2O9-xBaZr0.2Ti0.8O3 composite ceramics were prepared by conventional solid-state sintering, and it was found that the introduction of BaZr0.2Ti0.8O3 increased the permittivity and reduced the dielectric loss of the material. The x = 0.01 sample exhibited the optimum electrical properties and the composite materials showed good thermal depoling performance.
CURRENT APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Bin Wang, Jiangfeng Hong, Yuting Yang, Haixia Zhao, Lasheng Long, Lansun Zheng
Summary: This study demonstrates for the first time how to achieve large d33 and g33 in a plastic molecule-based ferroelectric material, which provides a solid foundation for the design of piezoelectric materials and the practical application of piezoelectric generators.
Article
Chemistry, Physical
Pariasadat Musavigharavi, Andrew C. Meng, Dixiong Wang, Jeffery Zheng, Alexandre C. Foucher, Roy H. Olsson, Eric A. Stach
Summary: The local atomic structure and nanoscale chemistry of ferroelectric aluminum scandium nitride thin films were investigated using advanced transmission electron microscopy techniques. The study revealed that in ultrathin films, the Sc alloying concentration and strain distribution become more pronounced.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Analytical
Vincent Polewczyk, Riccardo Magrin Maffei, Giovanni Vinai, Matteo Lo Cicero, Stefano Prato, Pietro Capaldo, Simone Dal Zilio, Alessandro di Bona, Guido Paolicelli, Andrea Mescola, Sergio D'Addato, Piero Torelli, Stefania Benedetti
Summary: By optimizing the fabrication process, the surface roughness of ZnO thin films can be reduced, the crystalline quality improved, and a good piezoelectric response maintained. Research shows that deposition with 75% O2 gas and thermal treatment at appropriate temperatures can achieve optimal results.
Article
Materials Science, Multidisciplinary
Davide Disnan, Jonas Hafner, Simone Benaglia, Marco Teuschel, Michael Schneider, Ricardo Garcia, Ulrich Schmid
Summary: In this paper, the crystalline morphology and surface characteristics of PVDF were studied, and the ferroelectric and piezoelectric properties of the electro-formed δ-PVDF thin films were analyzed and characterized.
MATERIALS RESEARCH LETTERS
(2023)
Article
Energy & Fuels
Alem Araya Meresa, Bhaskar Parida, Dang Xuan Long, Donguk Kim, Taemin Kim, Taeshik Earmme, Jongin Hong, Dong-Won Kang, Felix Sunjoo Kim
Summary: In this study, bis(pentafluorophenyl)zinc (BPFZn) was introduced as a molecular dopant in a polymer:fullerene blend to enhance the efficiency of organic solar cells. The results showed improved power conversion efficiency, increased fill factor, enhanced exciton dissociation, and suppressed charge recombination.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Physical
Tan Tan Bui, Min Kyoung Shin, Seung Yong Jee, Dang Xuan Long, Jongin Hong, Myung-Gil Kim
Summary: High-performance low-cost polyvinylidene fluoride (PVDF) nanofiber (NF) filter membranes were fabricated via electrospinning, showing high filtration efficiency and excellent stability.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Applied
Mutia Anissa Marysya, Dini Hayati, Sooyoung Han, Dang Xuan Long, Kyunggah Choi, Jongin Hong
Summary: We have successfully synthesized UV-harvesting dyes with a fluorene donor and different pi-conjugation bridges. We have also studied the spectroscopic, electrochemical, and colorific properties of the dyes, and confirmed their usefulness as photosensitizers in visibly transparent and colorless dye-sensitized solar cells. The UV-selective and visibly transparent solar cells show power conversion efficiencies ranging from 0.91% to 2.70% under one sun illumination, and from 6.17% to 8.13% under UVA illumination, with corresponding visible light transmittance of 60.73% to 58.22% and general color rendering index of 91 to 90.
Article
Chemistry, Physical
Chi Hao Liow, Hyeonmuk Kang, Seunggu Kim, Moony Na, Yongju Lee, Arthur Baucour, Kihoon Bang, Yoonsu Shim, Jacob Choe, Gyuseong Hwang, Seongwoo Cho, Gun Park, Jiwon Yeom, Joshua C. Agar, Jong Min Yuk, Jonghwa Shin, Hyuck Mo Lee, Hye Ryung Byon, EunAe Cho, Seungbum Hong
Summary: This study establishes a relationship between experimental parameters and performance using an inverse design surrogate model based on descriptors derived from expert conclusions. The model predicts design variables without the need for trial and error, serving as an effective strategy for cathode retrosynthesis.
Article
Chemistry, Physical
Yong Cheon Park, Taehyun Kim, Hye Rin Shim, YoungWoo Choi, Seungbum Hong, Seunghyup Yoo, Sung Gap Im
Summary: This study improves the robustness of thin film encapsulation (TFE) in mechanical deformation by harnessing interfacial residual stress. The residual stress is generated by the temperature difference between the organic layer deposition and the inorganic layer deposition, and it is optimized by controlling the organic layer thickness, coefficient of thermal expansion (CTE), and elastic modulus. The TFE with optimized residual stress retains a low water vapor transmission rate (WVTR) after multiple bending cycles.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Seyeon Park, SungHyun Jeon, Honghui Kim, James Philips, DongHwan Oh, Jaewan Ahn, Minhyun Kim, Chungseong Park, Seungbum Hong, Jihan Kim, WooChul Jung, Il-Doo Kim
Summary: Activation of metal oxides by light is a powerful method to modify their surface chemistry for efficient heterogeneous catalysis and gas sensing. However, understanding of the interface chemistry and mechanism restricts the rational design of oxide interfaces for light-activated gas sensing. In this study, the TiOx-assisted photosensitization of In2O3 towards NO2 sensing was investigated to elucidate the detailed mechanism of light-activated surface chemistry at the metal/gas interface. The resulting heterogeneous oxides demonstrated remarkable NO2 sensing performance under light irradiation due to abundant photoexcited electrons and holes that facilitated surface reactions. Moreover, the easy transfer of electrons and holes across the TiOx-In2O3 interface improved the reversibility of sensing kinetics. This study provides mechanistic insight into how surface chemistry of metal oxides can be controlled by light activation, offering an effective approach for designing high-performance gas sensors.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Ghifari M. M. Alvien, Dang Xuan Long, Kantapa Yolthida, Yoon Hee Jang, Jongin Hong
Summary: A combustion-assisted polyol reduction method has been developed for depositing efficient and transparent Pt counter electrodes in bifacial dye-sensitized solar cells. This method allows for a decrease in reduction temperature to 150 degrees C by adding a fuel that provides extra heat. The stable Pt complexes formed in the system regulate the size of Pt nanoparticles, resulting in excellent electrocatalytic activity and high visible light transmittance. Bifacial DSSCs fabricated with CPR-Pt counter electrodes reach efficiencies of 6.71% and 6.41% under front and back irradiations, respectively.
CHEMISTRY-AN ASIAN JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Jim James, Nathan Pruyne, Tiberiu Stan, Marcus Schwarting, Jiwon Yeom, Seungbum Hong, Peter Voorhees, Ben Blaiszik, Ian Foster
Summary: In this study, 3D convolutional neural networks (CNNs) were trained to segment 3D datasets, leading to a better understanding of phase transformation phenomena such as dendritic solidification. Both 2D and 3D CNN architectures outperformed the previous state of the art with the use of hyperparameter optimization and fine-tuning techniques. The 3D U-Net architecture produced the best segmentations according to quantitative metrics, while the 3D FCDense architecture exhibited the smoothest boundaries and best segmentations based on visual inspection.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Chemistry, Physical
Swathi Ippili, Venkatraju Jella, Jaegyu Kim, Seungbum Hong, Hyun-Suk Kim, Soon -Gil Yoon
Summary: By incorporating air-stable 2D-layered DAPPbI4 perovskite into PVDF, a high-performance and mechanically robust DAPPbI4-PVDF composite TENG was developed. The TENG exhibited enhanced output performance with high voltage, current density, power density, and pressure sensitivity, demonstrating excellent mechanical durability and operational stability as a sustainable power source for portable electronics.
Article
Chemistry, Multidisciplinary
Sung Su Han, Athira Thacharon, Jun Kim, Kyungwha Chung, Xinghui Liu, Woo-Sung Jang, Albina Jetybayeva, Seungbum Hong, Kyu Hyoung Lee, Young-Min Kim, Eun Jin Cho, Sung Wng Kim
Summary: This study demonstrates the role of excess electrons in nanoparticle-based heterogeneous catalysts, specifically on the negatively charged surface of copper nanoparticles, which provides unrestricted active sites for catalytic reactions, leading to efficient production of chemicals.
Article
Chemistry, Multidisciplinary
Megala Moorthy, Brindha Moorthy, Bala Krishnan Ganesan, Aditi Saha, Seungju Yu, Do-Hoon Kim, Seungbum Hong, Sangho Park, Kisuk Kang, Ranjith Thangavel, Yun-Sung Lee
Summary: Sodium metal (Na) anodes, with high capacity and low electrochemical potential, are considered the most promising anode for high-energy-density sodium batteries. However, uncontrolled Na dendrite growth and unstable solid electrolyte interphase layer (SEI) formation during cycling have led to poor coulombic efficiency and shorter lifespan. This study explores a series of Na-ion conductive alloy-type protective interfaces (Na-In, Na-Bi, Na-Zn, Na-Sn) as artificial SEI layers to address these issues.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Anggia Ismi Simpang, Alvien Ghifari, Soo-Young Han, Dini Hayati, Dang Xuan Long, Yoon Hee Jang, Jongin Hong
Summary: We have synthesized photochromic donor-pi-acceptor (D-pi-A) dyes with an azobenzene spacer and diphenylamine (DPAC) and dimethylamine (DMAC) as donor residues. These dyes were characterized and their application in dye-sensitized solar cells (DSSCs) was investigated. The trans-cis isomerization of the azobenzene bridge allows for regulation of the photovoltaic behavior in DSSCs using iodine and cobalt-based redox electrolytes. DMAC-DSSCs perform the best with iodide/triiodide redox shuttle, while DPAC-DSSCs show optimal performance with cobalt redox mediator. Under one sun illumination at the photostationary state, DMAC- and DPAC-DSSCs achieve power conversion efficiencies (PCEs) up to 1.99% and 1.08%, respectively.
Article
Chemistry, Physical
Gun Park, Hyeongyu Moon, Sunyoung Shin, Sumin Lee, Yongju Lee, Nam-Soon Choi, Seungbum Hong
Summary: The use of single-walled carbon nanotubes as conductive additives helps preserve electron-conduction channels and stabilize electrochemical reactions in Si-based anode materials. The role of SWCNTs in ensuring uniform volume change during cycling and alleviation of particle pulverization is revealed through surface potential mapping.
ACS ENERGY LETTERS
(2023)
Article
Energy & Fuels
Jimin Oh, Dong Ok Shin, Myeong Ju Lee, Yong Min Lee, Young-Gi Lee, Seungbum Hong, Kwang Man Kim
Summary: Garnet-type Li7La3Zr2O12 (LLZO) solid electrolytes with interconnected and larger rounded particle morphologies were synthesized using a cellulose template method and conventional solid-state reaction. The LLZOs with interconnected particle morphology showed higher ionic conductivity with optimized heat-treatment temperature (900 degrees C) and LLZO content (30 wt%). The NG-based composite anode filled with interconnected LLZO particles exhibited improved cycle stability and enhanced high-rate capability compared to the composite anode embedded with conventional spherical-type LLZO particles.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Multidisciplinary
Kantapa Yolthida, Dang Xuan Long, Ghifari M. Alvien, Jongin Hong
Summary: We conducted a comprehensive investigation on the synthesis of platinum counter electrodes (CEs) for bifacial dye-sensitized solar cells (DSSCs) using a fuel-assisted polyol reduction method. Different fuels were employed, and the electrocatalytic activity of the resulting Pt CEs was examined. Fmoc-glycine proved to be the most promising fuel, resulting in Pt CEs with exceptional electrocatalytic abilities and high transmittance. This study highlights the significance of fuel-assisted synthesis techniques in achieving highly efficient Pt CEs for bifacial DSSCs.
NEW JOURNAL OF CHEMISTRY
(2023)
