Article
Chemistry, Multidisciplinary
Yanbin Chen, Chuzhong Zhang, Jiechao Jiang, Efstathios Meletis, Jialu Wu, Jing Ma, Ce-wen Nan, Chonglin Chen
Summary: Double-perovskite PrBaCo2O5.5+delta thin films were grown on (001) LaAlO3 substrates to study the processing dynamic-tuned epitaxial nature and physical properties under different oxygen contents. It was found that the microstructure and properties of the films were sensitive to oxygen content and the nature of the strained layer (SL) at the substrate-film interface. Manipulating the microstructure of perovskite complex oxides through different annealing environments and oxygen kinetics provides new insights into investigating multifunctional complex oxide systems.
CRYSTAL GROWTH & DESIGN
(2021)
Review
Physics, Applied
Xudong Liu, Jie Tu, Hangren Li, Jianjun Tian, Linxing Zhang
Summary: This paper introduces double perovskite ferroelectric thin films as a new material system with diverse composition and structure, providing new possibilities for the development of ferroelectric thin films. The ordered double perovskite ferroelectric thin films exhibit excellent ferroelectric, dielectric, magnetic, and optical properties, with potential applications in photovoltaic cells, information memory, and spintronic and photoelectric devices. However, complex internal physical mechanisms and difficult preparation conditions hinder its further development. This paper reviews the characterization methods and synthesis conditions affecting the ordering of double perovskite ferroelectrics, and presents the advances and challenges in various areas related to this material system.
APPLIED PHYSICS REVIEWS
(2023)
Article
Chemistry, Physical
Haena Yim, So Yeon Yoo, Haneul Choi, Hye Jung Chang, Seong-Ju Hwang, Sahn Nahm, Minoru Osada, Ji-Won Choi
Summary: The study proposes a new material design route to achieve high permittivity behavior in atomically thin films. By ion exchange and chemical exfoliation, thin films with high dielectric permittivity are obtained. This provides a strategy for obtaining new high-k nanoscale dielectrics in the field of nanoelectronics.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Susan A. Rigter, Xueying L. Quinn, Rishi E. Kumar, David P. Fenning, Philippe Massonnet, Shane R. Ellis, Ron M. A. Heeren, Katrine L. Svane, Aron Walsh, Erik C. Garnett
Summary: The addition of acetate precursors promotes rapid desolvation for making a variety of compositions of amorphous lead halide perovskite films. By controlling the amount of acetate, the transition from fully crystalline to fully amorphous films can be tuned, resulting in an intermediate state with crystalline islands embedded in an amorphous matrix.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Materials Science, Ceramics
Chuanbin Wang, Junwei Shi, Hui Gan, Xiufen Wang, Mingzhe Hu
Summary: By doping different concentrations of Mg2+ at Ni site, epitaxial growth of (00l)-oriented La2MgxNi1-xMnO6 double-perovskite thin films (abbreviated as LMxNMO, x = 0, 0.1, 0.2, 0.3, 0.4) was achieved through pulsed laser deposition. The substitutional effect of Mg2+ on the structural and magnetic properties of the films was comprehensively investigated. Increasing Mg-doping concentration led to an increase in in-plane and out-of-plane lattice constants and cell volume of the LMxNMO thin films, attributed to the radius difference between Mg2+ and Ni2+/Ni3+ ions, resulting in in-plane compressive stress. When Mg-doping concentration was small (x <= 0.1), Mg2+ tended to substitute Ni3+, suppressing the antiferromagnetic interaction between Ni3+-O-Mn3+ and reducing exchange bias field but increasing saturation magnetization. However, when Mg-doping concentration increased to x >= 0.2, Mg2+ mainly replaced Ni2+ position, inhibiting super-exchange ferromagnetic interaction between Ni2+-O-Mn4+ magnetic paths and thus reducing saturation magnetization. Enhanced magnetic properties were observed in the LM0.1NMO double-perovskite thin film, with a large saturation magnetization of 492.12 emu/cm(3) and a high Curie temperature of 262.7 K.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Hao Li, Fei Liu, Shaojun Liu
Summary: The oxygen octahedral can be distorted by epitaxial strain caused by lattice mismatch. Epitaxial strain decreases linearly with the growth temperature. Infrared reflectivity spectroscopy shows infrared modes related to in-phase tilting. The intrinsic quality factor of the thin films increases with the improvement of crystalline quality.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Fang Wang, Cong Zhu, Shifeng Zhao
Summary: Lead-free perovskite-structured Na0.5Bi0.5TiO3 (NBT) thin films prepared by sol-gel technology exhibit good energy storage performance, with a recoverable energy density of 23.3 J/cm(3) and energy storage efficiency of 61.6%, making them promising for capacitors with high energy storage properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Sakineh Hosseini, Ahmad Gholizadeh
Summary: In this study, pure-phase BiFe1-xMnxO3 (x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5) thin films were deposited using a low-temperature sol-gel assisted spin coating procedure. It was found that the films underwent a structural transition and the surface morphology and grain size were affected by the amount of Mn. The BiFe0.8Mn0.2O3 thin film showed the lowest bandgap energy and exhibited the best photocatalytic activity.
CERAMICS INTERNATIONAL
(2023)
Article
Physics, Condensed Matter
T. Kurachi, T. Yamaguchi, E. Kobayashi, T. Soma, A. Ohtomo, T. Makino
Summary: The complex dielectric functions of LiNbO2 were determined using optical transmittance and reflectance spectroscopies, revealing distinct structures at several bandgap energies. The bandgaps in the spectrum were observed at around 2.3, 3.2, 3.9, and 5.1 eV, and these features were quantitatively reproduced to some extent by an ab-initio calculation including the interaction effects between electrons and holes.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Chemistry, Physical
Himalay Basumatary, J. Arout Chelvane, D. V. Sridhara Rao, A. Talapatra, J. Mohanty, Deepak Kumar, Vajinder Singh, S. Kamat, Rajeev Ranjan
Summary: This study investigated the magnetic behavior of Tb-Fe thin films with different thicknesses, revealing the presence of out-of-plane magnetic anisotropy in these films.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Renzhong Xue, Liuyang Zhao, Siyuan Chen, Hongxuan Chen, Mengru Cui, Xintao Bai, Tao Li, Dewei Liu, Haiyang Dai
Summary: The effects of A-site transition from Ca2+ to Cd2+ on the microstructure, morphology, and electrical properties of Ca(1-x)CdxCu(3)Ti(4)O(12) thin films were investigated. The films exhibited smooth and compact surfaces without cracks. The transition from Ca2+ to Cd2+ resulted in changes in grain size and electrical properties. In particular, the simultaneous occupancy of A sites by Ca2+ and Cd2+ improved the dielectric and nonlinear properties of Ca1-xCdxCu3Ti4O12 films.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Hailong Liang, Jin Xu, Dayu Zhou, Shiqiang Ren
Summary: This study investigated the dielectric properties of yttrium doped hafnium oxide films using metal-insulator-semiconductor structures with varying yttrium contents and film thicknesses. A phase diagram was constructed to illustrate the changes in crystal structure and dielectric properties based on different yttrium contents and film thicknesses, serving as a useful tool for optimizing the electrical properties of yttrium doped hafnium oxide thin films.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Peter Swekis, Aleksandr S. Sukhanov, Yi-Cheng Chen, Andrei Gloskovskii, Gerhard H. Fecher, Ioannis Panagiotopoulos, Jorg Sichelschmidt, Victor Ukleev, Anton Devishvili, Alexei Vorobiev, Dmytro S. Inosov, Sebastian T. B. Goennenwein, Claudia Felser, Anastasios Markou
Summary: This study investigates the structural, magnetic, and electronic properties of magnetic Weyl semimetal thin films of Co2MnGa, revealing the impact of film thickness on structural and magnetic properties, and providing experimental insights into the electronic and magnetic properties of magnetic Weyl semimetal thin films.
Article
Materials Science, Multidisciplinary
Hina Nazli, Wardah Ijaz, Zohra Nazir Kayani, Amir Razi, Saira Riaz, Shahzad Naseem
Summary: In this research, magnesium-iron-oxide thin films were successfully synthesized on copper substrates using the electrodeposition technique. The thin film at 30 min oxidation time exhibited larger crystallite size, smooth porous structure, higher dielectric constant, lower loss tangent, and strong ferromagnetic behavior. These findings make the MgFe2O4 thin film a potential candidate for electronic and spintronic devices.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Kelly M. Walsh, Kimo Pressler, Matthew J. Crane, Daniel R. Gamelin
Summary: This study investigates the magneto-optical responses of CsEuCl3 perovskite material in the near-UV/visible region using magneto-photoluminescence and magnetic circular dichroism spectroscopies. The results reveal that CsEuCl3 perovskite exhibits complete spin alignment and ferromagnetism at low temperatures, as well as spin-polarized photoluminescence in the presence of a magnetic field.
Article
Chemistry, Physical
Heng Zhang, Jamo Momand, Joshua Levinsky, Qikai Guo, Xiaotian Zhu, Gert H. ten Brink, Graeme R. Blake, George Palasantzas, Bart J. Kooi
Summary: Bi2Te3-based alloys exhibit outstanding thermoelectric properties, with highly-textured and single-crystal-like thin films showing different electrical conductivity and Seebeck coefficient. The influence of nanoscale structural effects on thermoelectric properties is demonstrated, providing insights for tailoring high-performance thermoelectric thin films. The atomic structure details revealed by scanning transmission electron microscopy are correlated with the measured properties, shedding light on the relationship between structure and performance.
Article
Chemistry, Multidisciplinary
Jacopo Pinna, Razieh Mehrabi Koushki, Dnyaneshwar S. Gavhane, Majid Ahmadi, Suhas Mutalik, Muhammad Zohaib, Loredana Protesescu, Bart J. Kooi, Giuseppe Portale, Maria Antonietta Loi
Summary: Nanoscale-level controlled ordering of colloidal quantum dots allows the achievement of outstanding transport properties, paving the way toward a new generation of optoelectronic devices.
ADVANCED MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Rodrigo Leal Martir, Maria Jose Sanchez, Myriam Aguirre, Walter Quinonez, Cristian Ferreyra, Carlos Acha, Jerome Lecourt, Ulrike Luders, Diego Rubi
Summary: In this study, it is demonstrated that there is an exchange of oxygen vacancies (OV) between the device and the environment in Pt/TiOx/TaOy/Pt devices under electrical stress, but this exchange is suppressed once the device is stabilized. The memristive behavior is determined by the internal electromigration between the TiOx and TaOy layers.
Article
Nanoscience & Nanotechnology
Wei Zhang, Jiajia Shen, J. P. Oliveira, Bart J. Kooi, Yutao Pei
Summary: In this study, laser powder bed fusion was used to fabricate an interstitial-strengthened high entropy alloy. Microstructural characteristics were evaluated using electron backscatter diffraction and high energy synchrotron X-ray diffraction. Tensile testing and micro-pillar compression tests were performed to reveal the deformation mechanisms and the influence of grain orientation.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Miguel Badillo, Sepide Taleb, Taraneh Mokabber, Jan Rieck, Rebeca Castanedo, Gerardo Torres, Beatriz Noheda, Monica Acuautla
Summary: So far, only a few chemical routes have been reported for the fabrication of ferroelectric HfO2 films, most of which are complicated and environmentally unfriendly. In this study, a new and effective chemical route for preparing ferroelectric doped-HfO2 films is presented. The solution is prepared from simple and stable precursors, easily handled in an open atmosphere, and does not require restrictive processing conditions. The doped films exhibit good ferroelectric properties and can be crystallized through rapid thermal annealing. The developed precursor solution shows promise for applications in spray-coating and ink-jet printing techniques.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Nanoscience & Nanotechnology
Heng Zhang, Majid Ahmadi, Wastu Wisesa Ginanjar, Graeme R. Blake, Bart J. Kooi
Summary: The nanostructure, thermal stability, and thermoelectric power factor of Sb2Te3/Ge1+xTe multilayers prepared by pulsed laser deposition are investigated. It is found that the layered structures of the multilayers are unstable upon heating, resulting in the dissolution of Sb2Te3 sublayers into Ge1+xTe. The dissolution depends on the relative thickness of the Ge1+xTe sublayer, which leads to variations in the nanostructure and influences the Seebeck coefficient and electrical conductivity.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Physics, Applied
G. A. Ramirez, W. Roman Acevedo, M. Rengifo, J. M. Nunez, M. H. Aguirre, J. Briatico, D. Rubi
Summary: In this work, the coexistence of volatile and nonvolatile memristive effects in epitaxial phase-separated La0.5Ca0.5MnO3 thin films was investigated. Volatile resistive changes arising from self-heating effects near a metal-to-insulator transition were observed at low temperatures (50 K). At higher temperatures (140 and 200 K), a combination of volatile and nonvolatile effects resulting from the synergy between self-heating effects and ferromagnetic-metallic phase growth induced by an external electrical field was measured. These findings demonstrate the potential of phase separated manganites for electrically mimicking the behavior of neurons and synapses on the same device, which is significant for the development of neuromorphic computing hardware.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Jennifer Hong, Suhas Mutalik, Matteo Miola, Dominic Gerlach, Razieh K. Mehrabi, Majid Ahmadi, Bart J. Kooi, Giuseppe Portale, Petra Rudolf, Paolo P. Pescarmona, Loredana Protesescu
Summary: Metal borides, such as nickel borides (NixB), are widely used materials in industry. However, their exploration at the nanoscale has been limited due to synthesis difficulties. In this study, a solid-state method was developed to synthesize NixB nanopowders and convert them into colloidal suspensions. The synthesis was achieved using commercially available salts and adjusting the synthetic parameters under mild and solvent-free conditions. Through mechanistic studies, it was found that Ni nanoclusters are intermediates in the boriding process, and size control can be achieved through reaction mediators. The stabilized NixB nanocrystals were then converted into stable inks for further solution processing applications, providing tools for the development of NixB-based catalysts and other metal boride colloidal nanostructures.
CHEMISTRY OF MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Wei Zhang, Hui Wang, Bart J. Kooi, Yutao Pei
Summary: A non-equiatomic interstitial-strengthened high entropy alloy (iHEA), Fe49.5Mn30Co10Cr10C0.5 (at.%), is manufactured by laser powder-bed fusion (LPBF) with stripe and chessboard scanning strategies. The relationship between laser scanning strategies and resulting microstructure, textures, and anisotropic mechanical properties in as-built iHEA is investigated. Results show that LPBF processed iHEA exhibits excellent strength-ductility synergy due to combined deformation mechanisms. The mechanical anisotropy is more evident in samples printed by the stripe scanning strategy compared to the chessboard-scanned samples, attributed to heterogeneous grain morphology and crystallographic texture resulting from different scanning strategies.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
Beatriz Noheda, Pavan Nukala, Monica Acuautla
Summary: More than ten years after the first report of ferroelectric switching in hafnium dioxide-based ultrathin layers, the nature of this phenomenon is still under debate, but it has sparked significant interest due to its potential for integration into semiconductor chips and scalability to smaller devices. Lessons learned from hafnium dioxide-based ferroelectrics offer promising avenues beyond random-access memories and field-effect transistors, and further research can lead to discoveries that address current issues and pave the way for low-power electronics and energy-efficient information processing.
Article
Nanoscience & Nanotechnology
Anouk S. S. Goossens, Majid Ahmadi, Divyanshu Gupta, Ishitro Bhaduri, Bart J. J. Kooi, Tamalika Banerjee
Summary: This study presents a compelling alternative memristive device that shows enhanced memristive memory window and maintained analog behavior through areal downscaling. By directly integrating the device designs on semiconducting Nb-doped SrTiO3, the electric field effects at edges are leveraged to increase the dynamic range in smaller devices. The findings also reveal the influence of applied electric fields on the physical extent of an interfacial layer, as observed through scanning transmission electron microscopy.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
D. T. Yimam, M. Ahmadi, B. J. Kooi
Summary: In this study, the growth of monatomic antimony thin films using pulsed laser deposition on lattice-matching and amorphous substrates was demonstrated. The results showed that the method can produce smooth and high-quality antimony thin films with uniform coverage, which have potential for research in phase change memory and nanophotonics.
MATERIALS TODAY NANO
(2023)
Article
Multidisciplinary Sciences
Herbert Jaeger, Beatriz Noheda, Wilfred G. G. van der Wiel
Summary: Approaching limitations of digital computing technologies have led to the exploration of neuromorphic and other unconventional computing methods. A formal theory beyond the classical symbolic-algorithmic Turing machine theory is needed to systematically engineer unconventional computing systems. This article proposes a general strategy for developing such a theory, particularly focusing on a bottom-up approach called fluent computing, which models physical computing systems based on what can be measured. The authors emphasize the challenges in learning from human brains to create powerful computers due to the absence of a guiding computing theory.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Giuseppe Bagnato, Michela Signoretto, Elena Ghedini, Federica Menegazzo, Xiaoying Xi, Gert H. ten Brink, Bart J. Kooi, Hero Jan Heeres, Aimaro Sanna
Summary: Bio-oil requires a stabilization stage before its upgrading, and the hydrogenation of the water fraction can effectively reduce acidity and improve stability. In this study, PdFe/ZrO2 catalyst showed the best performance in reducing acidity and improving stability of bio-oil.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Automation & Control Systems
Jan L. Rieck, Davide Cipollini, Mart Salverda, Cynthia P. Quinteros, Lambert R. B. Schomaker, Beatriz Noheda
Summary: The study discovers the electronic conduction along individual domain walls (DWs) in nominally insulating ferroelectric materials, providing potential applications for self-assembled nanometric conduction paths. These findings are of great significance for investigating DWs as memristive networks for information processing and in-material computing.
ADVANCED INTELLIGENT SYSTEMS
(2023)