Article
Materials Science, Ceramics
S. V. Kuznetsov, Yu. A. Ermakova, K. N. Boldyrev, V. S. Sedov, A. A. Alexandrov, V. V. Voronov, S. Kh. Batygov, A. D. Rezaeva, A. R. Drobysheva, N. Yu. Tabachkova
Summary: Novel scintillating and visualizing materials are crucial for the development of high-power X-ray sources. This study focuses on the formation of composite materials consisting of X-ray luminescent nanoparticles in a robust transparent matrix. Sr0.85-xBaxEu0.15F2.15 nanopowders were synthesized and the most optimal composition with the brightest luminescence response was determined.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Electrical & Electronic
Pengfei Yu, Wenfei Liu, Pandeng Gao, Tingquan Shao, Shiwei Zhao, Zhao Han, Xuanbing Gu, Jiawei Zhang, Yan Wang
Summary: In this study, tetragonal barium titanate (BaTiO3) nanopowders were successfully synthesized using the sol-hydrothermal method. The effects of temperature, time, and raw materials on the properties of BaTiO3 were investigated. The optimized conditions resulted in powders with high crystallinity and tetragonal content, making them suitable as medium materials for multilayer ceramic capacitors.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Optics
Masato Iwaki, Ryo Tanaka, Kazuyoshi Uematsu, Mineo Sato, Kenji Toda
Summary: In this study, high-purity Eu2+-activated MSi2O2N2 phosphors were synthesized via a one-pot solid-state reaction. The experimental conditions such as raw materials and heating temperature were optimized. It was found that the formation of Eu2+-activated MSi2O2N2 depended on the intermediate compounds and the oxygen/nitrogen ratio. Furthermore, the particle morphology, photoluminescence and excitation measurement, quantum efficiencies, lifetime, and thermal quenching behaviors were systematically investigated.
JOURNAL OF LUMINESCENCE
(2023)
Article
Materials Science, Ceramics
Angel de Jesus Morales-Ramirez, Margarita Garcia-Hernandez, Maria Luz Carrera-Jota, Paulina Garnica-Chavez, Brenely Gonzalez-Penguelly, Aristeo Garrido-Hernandez
Summary: Lu2Si2O7:Eu3+ thin films were prepared using sol-gel methods and dip coating, and exhibited a monoclinic structure with preferential orientation along a specific direction after heat treatment. The films showed strong emission from Eu3+ ions, with the optical yield and decay time increasing with the SiO2 content.
CERAMICS INTERNATIONAL
(2023)
Article
Mechanics
Dan Sui, John E. Huber, Jie Zhou
Summary: The study utilizes superposition theory to analyze the boundary value problem of needle domains in barium titanate single crystals, revealing conditions for stabilizing needle domains and presenting simulation results of comb-like array evolution.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2021)
Article
Polymer Science
Ekaterina I. Lashkovskaya, Nikolai V. Gaponenko, Margarita V. Stepikhova, Artem N. Yablonskiy, Boris A. Andreev, Vadim D. Zhivulko, Alexander V. Mudryi, Igor L. Martynov, Alexander A. Chistyakov, Nikolai I. Kargin, Vladimir A. Labunov, Tamara F. Raichenok, Sergey A. Tikhomirov, Victor Yu. Timoshenko
Summary: Erbium upconversion photoluminescence from sol-gel derived barium titanate xerogel structures on different substrates was studied. The intensity of erbium UC PL can be increased by adding a layer of strontium titanate or codoping with erbium and ytterbium. Tuning of the cavity mode was achieved by assembling a multilayer microcavity structure.
Article
Materials Science, Ceramics
I. E. Kolesnikov, R. S. Bubnova, A. Povolotskiy, Y. P. Biryukov, A. Povolotckaia, O. Yu Shorets, S. K. Filatov
Summary: This study demonstrated the luminescent properties of Ba3Lu2B6O15 phosphors doped with Eu3+ ions for the first time and reported the dependence of luminescence properties on the crystal structure. The successful isomorphic substitution of Lu3+ sites by Eu3+ ions was confirmed. Increasing Eu3+ doping concentration leads to a gradual shift in chromaticity from violet to red.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Bi Fu, Jianjie Li, Huaide Jiang, Xiaoli He, Yanmei Ma, Jingke Wang, Chaoyang Shi, Chengzhi Hu
Summary: By modulating the morphology and microstructure of ferroelectric materials, the piezo-photocatalytic activity of ferroelectric/oxide semiconductor heterojunctions can be enhanced. In this study, BaTiO3 nanoparticles were used to construct BaTiO3@TiO2 hybrid nanofibers, which exhibited significant enhancement of synergetic piezo-photocatalytic effect under ultrasonic and ultraviolet light irradiation. The enhanced activity can be attributed to the enhancement of the piezotronic effect by single-crystalline ferroelectric nanoparticles and the nanoconfinement effect of nanofibers with high specific surface areas.
Article
Engineering, Electrical & Electronic
Long Wang, Jiqing Lv, Feng Shi, Kaixin Song, Wen Lei, Huanfu Zhou, Ze-Ming Qi, Jing Wang
Summary: The single-phase BaTiO3 ceramic was prepared by solid-state sintering at 1220 degrees C for 4 h. XRD analysis confirmed it as tetragonal phase BaTiO3 with space group P4mm (No. 99). The dielectric properties of the ceramic were analyzed using Raman and far-infrared spectroscopy, showing a dielectric constant of 20.0782 and dielectric loss of 19.9756 x 10(-4). The theoretical calculations were found to differ significantly from the tested data due to the spontaneous polarization in the tetragonal phase BaTiO3.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
Kiflom Gebremedhn Kelele, H. C. Ananda Murthy, Ruthramurthy Balachandran, Aschalew Tadesse, K. B. Tan
Summary: The goal of this research was to examine the differences in dielectric properties between barium strontium titanate (BST) and BST doped with molybdenum. The results showed that the addition of Mo6+ ions reduced the crystallite and particle size of BST, while increasing its dielectric constant and reducing dielectric loss. These changes make BST doped with Mo suitable for various applications.
MATERIALS TECHNOLOGY
(2022)
Article
Environmental Sciences
Dong Hyun Kim, Seung Jun Lee, Jayaraman Theerthagiri, Moonhee Choi, Jongsuk Jung, Yiseul Yu, Kwang Seop Im, Hyeon Jin Jung, Sang Yong Nam, Myong Yong Choi
Summary: This study investigated the phase transition and structural stability of tetragonal BaTiO3 nanopowders with pseudo-cubic phase using in-situ high resolution and high temperature X-ray diffraction method. The coexistence of tetragonal and cubic phases was detected, with complete transition to the cubic phase below 150 degrees C. The phase transformation behavior and structural changes were observed, providing insights into the properties of BaTiO3 nanopowders.
Article
Materials Science, Multidisciplinary
Pankaj P. Khirade, Vithal Vinayak, Prashant B. Kharat, Apparao R. Chavan
Summary: This research presents a simple, economical, and low-temperature green combustion synthesis method for Ba1-xSrxTiO3 ceramic nanopowders, using lemon juice as a firing agent. The introduction of Sr2+ ions enhances dielectric and electrical properties while weakening ferroelectric characteristics, primarily due to significant changes in the solid microstructure.
Article
Nanoscience & Nanotechnology
Felix Jungwirth, Fabrizio Porrati, Alfons G. Schuck, Michael Huth, Sven Barth
Summary: Two new precursors for focused electron beam-induced deposition (FEBID) of cobalt silicides have been synthesized, showing low sensitivity to changes in FEBID parameters and high growth rates. The deposits contain about 80% cleaved carbonyl ligands and exhibit temperature-dependent electrical properties, with magnetoresistance behavior indicative of tunneling magnetoresistance. Postgrowth irradiation treatment substantially reduces the observed magnetoresistance.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Ajay Kumar, Sudip Naskar, Dipankar Mandal
Summary: In order to enhance the energy density in polymer nanocomposite film, we proposed a filler of single material with multiple interfaces. By using the electrospinning process, core-shell polydopamine (PDA) coated BaTiO3 (BT) incorporated in 1D BT architecture filler was prepared. The introduction of a ferroelectric filler significantly increased the dielectric constant and energy density of the nanocomposite film.
SURFACES AND INTERFACES
(2023)
Article
Chemistry, Inorganic & Nuclear
R. Lopez-Esquivel, I. A. Garduno-Wilches, J. C. Guzman-Olguin, T. Rivera Montalvo, J. Guzman-Mendoza
Summary: This study investigates the thermally coupled energy levels of the trivalent europium ion in the barium hafnate matrix using ultraviolet radiation in the temperature range of 289.7-323.8 K. The results show that the sample doped with 3.0% atomic of trivalent europium exhibits the highest luminescent emission, while the bands associated with D-5(0) → F-7(J) (J = 1, 2, 3, 4) transitions have a strong dependence on temperature within the physical range.
APPLIED RADIATION AND ISOTOPES
(2022)
Article
Chemistry, Physical
Vitalii Boiko, Zhengfa Dai, Mykhailo Chaika, Karina Grzeszkiewicz, Jiang Li, Wieslaw Strek, Dariusz Hreniak
Summary: In this study, YAGG:Cr3+ nanophosphors were synthesized using the Pechini method and their crystalline size was controlled by annealing. The structure and morphology of the samples were characterized, and the lattice parameters and crystalline sizes were calculated. The effect of crystalline size on the optical properties was investigated through excitation and emission spectra analysis. The probability of carrier recombination and trap redistribution were determined experimentally using thermoluminescence analysis.
Article
Chemistry, Multidisciplinary
Natalia G. Kobylinska, Vadim G. Kessler, Gulaim A. Seisenbaeva, Oksana A. Dudarko
Summary: Low-cost mesoporous silica materials of the SBA-15 family were prepared and functionalized, demonstrating high adsorption capacity and selectivity for the removal of a broad spectrum of hazardous metal pollutants from environmental water.
Article
Chemistry, Multidisciplinary
Vitalii Boiko, Maria Luisa Saladino, Francesco Armetta, Federica Ursi, Marta Markowska, Karina Grzeszkiewicz, Cecilia Mortalo, Cristina Leonelli, Dariusz Hreniak
Summary: A new method for synthesizing Y3Al2Ga3O12 (YAGG) nanophosphors, which allows the preparation of crystallites with sizes starting from 45 nm, is presented. The controllability of the energy and trap density of the resulting materials by annealing temperature has been confirmed by thermoluminescence measurements. It has been found that annealing temperatures up to 1300 degrees C do not cause significant growth of crystallites, but do affect the activation energy of the persistent luminescence process. Annealing above 1400 degrees C results in grain growth on the submicron scale.
Article
Chemistry, Inorganic & Nuclear
Magdalena Kulpa-Greszta, Anna Tomaszewska, Andrzej Dziedzic, Robert Pazik
Summary: Different types of ferrite core-shell structures were prepared through the seed-mediated approach, including CoFe2O4@CoFe2O4, CoFe2O4@Fe3O4, CoFe2O4@MnFe2O4, and CoFe2O4@MnFe2O4@ZnFe2O4. This synthetic method offers great flexibility in engineering multi-shell ferrite nanoparticles, which can be further applied in various advanced applications. The particle size tuning of homo- and heterostructures can be easily achieved by controlling the concentration of metal acetylacetonates without changing the synthetic parameters.
DALTON TRANSACTIONS
(2023)
Article
Materials Science, Ceramics
Vadim G. Kessler, Gulaim A. Seisenbaeva
Summary: This review summarizes recent insights into general reaction pathways in sol-gel synthesis of metal oxides. Metal-based sol-gel precursors display high reactivity and reversibility on a molecular level. The formation of metal oxide sols involves nucleation of oxide phase with growth option efficiently precluded by low solubility. The sols are stabilized by colloid forces and can be denoted as Micelles Templated by Self-Assembly of Ligands (MTSALs). The sol-gel transition occurs on particle aggregation, allowing the production of materials with controlled porosity and access to thermodynamically challenging phases.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Vadim G. Kessler
Summary: This article proposes a new term "paperbag compound" to replace "cluster" for oligonuclear non-cluster species. Analysis of structure and bonding parameters in paperbag compounds can provide new insights into the reactivity of metal oxide nanoparticles in biological systems.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Donglei Wei, Xifeng Yang, Yushen Liu, Yiquan Wu, Dariusz Hreniak
Summary: In this study, Li+ and Eu3+ single-and co-doping were investigated to improve the electronic structure, optical properties, and pollutant-photodegradation efficiency of V2O5. The results showed that Li+ and Eu3+ doping significantly enhanced the photocatalysis of V2O5 due to the increased specific surface area, multivalent V4+/5+ ions, prolonged charge lifetime, and accelerated charge dispersion.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Francesco Armetta, Vitalii Boiko, Dariusz Hreniak, Cecilia Mortalo, Cristina Leonelli, Ludovico Barbata, Maria Luisa Saladino
Summary: This study reports a method for controlling the desired shape and microstructure of YPO4:Eu3+ nanoparticles using the precipitation method followed by hydrothermal treatment. The method allows for highly controlled formation of YPO4:Eu3+ by selecting appropriate synthesis parameters. The shape and size of the nano-needle-shaped particles can be independently controlled in both directions through autoclave processing time, as confirmed by various analytical techniques.
CERAMICS INTERNATIONAL
(2023)
Article
Construction & Building Technology
T. Jesiak, M. Hasiak, A. Laszcz, J. Checmanowski, Y. Gerasymchuk, P. Stachowiak, W. Strek, D. Hreniak
Summary: This study explores the combination of thermal insulation properties of porous oxide material and the exceptional thermal conductivity properties of graphene flakes. Blocks of porous glass foam matrix were prepared using the sol-gel method and heat treatment at 450 degrees C. The microstructure of the samples was analyzed using scanning electron microscopy, Raman spectroscopy, and X-ray diffraction. The thermal and mechanical properties of the samples were discussed in relation to their potential applications as novel thermo-smart composite materials.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Chemical
Marijana Lakic, Troy C. Breijaert, Geoffrey Daniel, Fredric G. Svensson, Vadim G. Kessler, Gulaim A. Seisenbaeva
Summary: Recycling of magnetic materials based on rare earth elements (REE) is important for clean energy production and transportation. One challenge is separating smaller amounts of late transition metals (LTM) from REE, which can be addressed using hybrid adsorbents. This study synthesized novel silica-based nanoadsorbents and found that they have high selectivity for LTM. The prepared materials showed rapid uptake of LTM cations and demonstrated potential for environmentally friendly separation techniques.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Aleksandra Gerus, Vitalii Boiko, Veronica Concetta Ciaramitaro, Maria Luisa Saladino, Dariusz Hreniak
Summary: This paper reports on the control of high brightness persistent luminescence of the smallest ZGO:Cr nanoparticles by optimizing hydrothermal synthesis parameters. The influence of pH solution, synthesis temperature, and calcination on structure and optical properties was systematically investigated. The results show that different synthesis conditions modify the trap depths distribution, affecting the duration and intensity of persistent luminescence.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Chemistry, Inorganic & Nuclear
Troy C. Breijaert, Tetyana M. Budnyak, Vadim K. Kessler, Gulaim A. Seisenbaeva
Summary: This article introduces a bio-based adsorbent nanomaterial, which is functionalized with cotton-derived nano cellulose particles and a polyamino ligand for the recycling of renewable energy and exhaust-free transportation. The research findings show that this adsorbent has high adsorption capacity and pronounced selectivity for late transition elements.
DALTON TRANSACTIONS
(2022)
Article
Materials Science, Multidisciplinary
Servane Gaio, Fredric G. Svensson, Troy C. Breijaert, Gulaim A. Seisenbaeva, Vadim G. Kessler
Summary: A novel nanoceria-nanocellulose hybrid material was developed and evaluated as a potential drug delivery system. The hybrid material displayed a better retention of ampicillin than triclosan, and outer-sphere complexes were observed between ceria and the drugs.
MATERIALS ADVANCES
(2022)
Article
Chemistry, Inorganic & Nuclear
Bjorn H. Greijer, Gustav Nestor, Jan E. Eriksson, Gulaim A. Seisenbaeva, Vadim G. Kessler
Summary: This study investigates the interaction between POMs and biomolecules, and finds that pH, ionic strength, and the molar ratio of POM to peptide are the main factors influencing their interaction. The sodium cations also play a role in directing the structure. These factors are important for the application of POMs in biological systems.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
