Article
Chemistry, Multidisciplinary
Ting Kang, Zijing Jin, Xu Han, Yong Liu, Jiawen You, Hoilun Wong, Hongwei Liu, Jie Pan, Zhenjing Liu, Tsz Wing Tang, Kenan Zhang, Jun Wang, Junting Yu, Dong Li, Anlian Pan, Ding Pan, Jiannong Wang, Yuan Liu, Zhengtang Luo
Summary: In this work, the band alignment of vertically stacked monolayer semiconducting transition metal dichalcogenides (TMDs) was effectively tuned using the chemical vapor deposition (CVD) method. By changing the alloy composition and twist angles, a continuously tunable band alignment and transition of different types of band alignment were achieved. The results showed that moderate twist angles significantly enhanced the photoluminescence, and the heterojunction device exhibited high photoresponsivity, large detectivity, and high external quantum efficiency.
Article
Nanoscience & Nanotechnology
Mingjun Qiu, Weiwei Du, Xinyu Luo, Siyuan Zhu, Yingwu Luo, Junjie Zhao
Summary: This study reports a molecular doping strategy using vapor-phase infiltration to achieve molecular-level dispersion of inorganic components in organosiloxane polymer thin films. By introducing Zn-OH components, the mechanical properties of the hybrid films were enhanced.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Won Tae Kang, Thanh Luan Phan, Kyung Jin Ahn, Ilmin Lee, Young Rae Kim, Ui Yeon Won, Ji Eun Kim, Young Hee Lee, Woo Jong Yu
Summary: This study demonstrates direct growth of MoSe2 films on selective pattern areas via a surface-mediated liquid-phase promoter using a solution-based approach, resulting in highly uniform films and the ability to produce other TMD films. The approach also allows control over various pattern shapes, sizes, and large-scale areas, improving applicability in future devices. The patterned MoSe2 field-effect transistor device exhibits a p-type dominant conduction behavior with a high on/off current ratio, providing guidance for future design of integrated devices for large-scale application.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Inorganic & Nuclear
Victoria K. Greenacre, Andrew L. Hector, Ruomeng Huang, William Levason, Vikesh Sethi, Gillian Reid
Summary: In this study, WSeCl4 was synthesized by heating WCl6 and Sb2Se3 in vacuo and characterized. The reaction of WSeCl4 with various ligands was investigated, and the properties of the resulting complexes were analyzed. Additionally, highly reflective WSe2 thin films were obtained through low-pressure chemical vapor deposition.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Multidisciplinary
David J. Hynek, Raivat M. Singhania, Shiyu Xu, Benjamin Davis, Leizhi Wang, Milad Yarali, Joshua Pondick, John M. Woods, Nicholas C. Strandwitz, Judy J. Cha
Summary: MoTe2 can access various electronic states due to small energy differences between its polymorphs, making it suitable for phase transformation studies and quantum phenomena. Large-area thin films with high crystallinity are crucial for careful applications of MoTe2.
Article
Materials Science, Multidisciplinary
Juan Jiang, Alex Taekyung Lee, Sangjae Lee, Claudia Lau, Min Li, Tor M. Pedersen, Chong Liu, Sergey Gorovikov, Sergey Zhdanovich, Andrea Damascelli, Ke Zou, Frederick J. Walker, Sohrab Ismail-Beigi, Charles H. Ahn
Summary: This study investigates the synthesis and electronic properties of epitaxial perovskite La1-xSrxRhO3 thin films, revealing the effect of Sr doping on the electronic phase diagram. Experimental data show an insulator-metal-insulator transition caused by Sr addition, which is explained by theoretical calculations.
Article
Chemistry, Multidisciplinary
O. Guselnikova, J. P. Fraser, N. Soldatova, E. Sviridova, A. Ivanov, R. Rodriguez, A. Y. Ganin, P. Postnikov
Summary: Covalent functionalization of 2D materials is crucial for tuning their properties, and this study demonstrates the effective functionalization of MoTe2 thin films using (3,5-bis(trifluoromethyl)phenyl)iodonium salt. The reaction produces stable and protected functionalized products, addressing the issue of aging in air.
MATERIALS TODAY CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Cheng -Yi Lai, Yung- Chen
Summary: (TiZrNbTa)N-x films were fabricated through reactive direct current magnetron sputtering, and their structural, mechanical, and anticorrosive properties were investigated. The N05 film exhibited the highest hardness, relatively lower elastic modulus, and the highest polarization resistance.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Quang Chieu Bui, Bassem Salem, Herve Roussel, Xavier Mescot, Youssouf Guerfi, Carmen Jimenez, Vincent Consonni, Gustavo Ardila
Summary: High temperature annealing under oxygen atmosphere has significant effects on the structure and properties of ZnO thin films, leading to improvements in grain boundary velocity and piezoelectric amplitude, ultimately enhancing the piezoelectric performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Geemin Kim, Sol An, Seok-Ki Hyeong, Seoung-Ki Lee, Myungwoong Kim, Naechul Shin
Summary: In this study, the combination of halide exchange process and patterning of metal halide perovskite thin films through vapor transport method was demonstrated, resulting in high-quality MAPbBr(3) pattern arrays with exceptional stability and detectivity in photodetectors. These results highlight the potential of chemical vapor deposition patterning of MHP materials in multicomponent optoelectronic device systems.
Article
Chemistry, Multidisciplinary
Federico Mazzola, Sandeep Kumar Chaluvadi, Vincent Polewczyk, Debashis Mondal, Jun Fujii, Piu Rajak, Mahabul Islam, Regina Ciancio, Luisa Barba, Michele Fabrizio, Giorgio Rossi, Pasquale Orgiani, Ivana Vobornik
Summary: This study demonstrates a genuine Mott transition without any symmetry breaking side effects in thin films of V2O3 using material synthesis and photoelectron spectroscopy. The spectral signal evolves slowly over a wide temperature range approaching the metal-insulator transition, with the Fermi wave-vector remaining unchanged and a lower critical temperature than that reported for the bulk.
Article
Chemistry, Physical
Sebastian M. J. Beer, Arbresha Muriqi, Patrick Lindner, Manuela Winter, Detlef Rogalla, Michael Nolan, Andreas Ney, Jorg Debus, Anjana Devi
Summary: Europium sulfide (EuS) thin films grown via chemical vapor deposition (CVD) exhibit high quality, stoichiometry, and tunability, with the advantage of avoiding the use of toxic hydrogen sulfide.
CHEMISTRY OF MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Manosi Roy, Kaushik Sarkar, Jacob Som, Mark A. Pfeifer, Valentin Craciun, J. David Schall, Shyam Aravamudhan, Frank W. Wise, Dhananjay Kumar
Summary: Epitaxial titanium nitride (TiN) and titanium oxynitride (TiON) thin films were grown on sapphire substrates using pulsed laser deposition (PLD) in high-vacuum conditions. The time-dependent surface oxidation of TiN to TiON films was controlled by adjusting the film deposition time through changing the number of laser pulses. XPS investigations showed higher oxygen content in TiON films prepared with a larger number of laser pulses. XRD analysis revealed an increase in lattice constant of TiON films with higher oxygen content. UV-visible spectroscopy measurements indicated an asymmetric V-shaped variation in the bandgap of TiN and TiON films as a function of the number of pulses.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Coatings & Films
Florian Lourens, Alfred Ludwig
Summary: This method presents a way to uniformly deposit thin films on microparticles by oscillating them, allowing for the coating of different types of particles and the deposition of films with composition gradients on uniform particles.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Crystallography
Feifei Lan, Rui Zhou, Ziyue Qian, Yuansha Chen, Liming Xie
Summary: In this study, Fe3O4 thin films with room-temperature ferrimagnetism were successfully grown using a simple chemical vapor deposition method. The films maintained good magnetic properties even at thicknesses as low as 4 nm. Various analysis techniques were used to study the structure and quality of the films, and it was found that the saturation magnetization was higher than that of bulk materials and the Verwey transition was observed. This work provides a new method for synthesizing ultrathin films with ferrimagnetic properties for applications in electronics, spintronics, and memory devices.
Article
Engineering, Mechanical
Leilei Chen, Zhenyu Zhang, Ming Lou, Kai Xu, Lu Wang, Fanning Meng, Denis Music, Keke Chang
Summary: This study explores the wear performance of the MEN system TiNbWN at different temperatures and reveals the role of in situ formed nanocrystalline oxides in the wear mechanism transition. This research is of great significance for understanding the wear behavior of refractory nitride films at high temperatures.
Article
Materials Science, Multidisciplinary
Mostafa El Laithy, Ling Wang, Terry J. Harvey, Alexander Schwedt, Bernd Vierneusel, Joachim Mayer
Summary: Dark etching region (DER) formation is the initial stage of subsurface microstructural changes in bearing steels due to cyclic stresses, which is followed by the development of low angle bands (LAB) and high angle bands (HAB). This study analyzes the development of DER in two different steels, 100Cr6 and 50CrMo4, at different stages of bearing lifetime using SEM, EBSD, and nanoindentation. The findings show that early stages of DER are characterized by multiple dark etching bands oriented relative to the rolling direction. These bands contribute to the refinement of the parent microstructure and act as stress points that initiate LAB formation through recrystallization. This study establishes a connection between DER and LAB/HAB development in rolling bearings.
Article
Materials Science, Ceramics
Clio Azina, Tim Bartsch, Damian M. Holzapfel, Martin Dahlqvist, Johanna Rosen, Lukas Lofler, Alba San Jose Mendez, Marcus Hans, Daniel Primetzhofer, Jochen M. Schneider
Summary: In this study, a metastable (Cr,Y)2AlC MAX phase solid solution was successfully synthesized by co-sputtering from a composite of Cr-Al-C and elemental Y targets, followed by annealing at room temperature. The direct high-temperature synthesis resulted in multiphase films, while deposition at room temperature followed by annealing led to the formation of phase pure (Cr,Y)2AlC. Higher annealing temperatures caused the decomposition of the metastable phase into Cr2AlC, Y5Al3, and Cr-carbides. The experimental findings were found to be in excellent agreement with the calculations predicting the formation and decomposition of the metastable phase.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
Annika Grundmann, Yannick Beckmann, Amir Ghiami, Minh Bui, Beata Kardynal, Lena Patterer, Jochen Schneider, Tilmar Kuemmell, Gerd Bacher, Michael Heuken, Holger Kalisch, Andrei Vescan
Summary: The effect of growth temperature and precursor ratio during MOCVD of WSe2 on the crystal quality and defect density were investigated. It was found that growth temperature has a larger influence on crystal quality than the precursor ratio. Increasing growth temperature leads to an increase in defect density, while increasing the precursor ratio decreases defect-related photoluminescence at low temperatures.
Article
Materials Science, Multidisciplinary
Soheil Karimi Aghda, Damian M. Holzapfel, Denis Music, Yeliz Unutulmazsoy, Stanislav Mraz, Dimitri Bogdanovski, Gonenc Fidanboy, Marcus Hans, Daniel Primetzhofer, Alba San Jose Mendez, Andre Anders, Jochen M. Schneider
Summary: The effects of ion irradiation on the structure, elastic properties, and thermal stability of metastable c-(Ti,Al)N thin films synthesized by high-power pulsed magnetron sputtering (HPPMS) and cathodic arc deposition (CAD) are systematically investigated using experiments and density functional theory (DFT) simulations. The results show that the orientation of the films changes with the ion kinetic energy, with CAD films exhibiting a (111) orientation at higher energies. The presence of Frenkel defects and the ion energy flux play a significant role in determining the elastic modulus of the films. Additionally, the increase in Frenkel pair concentration caused by ion irradiation delays the formation of the wurtzite phase in c-(Ti,Al)N.
Article
Chemistry, Multidisciplinary
Lukas Voelkel, Dennis Braun, Melkamu Belete, Satender Kataria, Thorsten Wahlbrink, Ke Ran, Kevin Kistermann, Joachim Mayer, Stephan Menzel, Alwin Daus, Max C. Lemme
Summary: The switching mechanism of multilayer hexagonal boron nitride (h-BN) threshold memristors with nickel (Ni) electrodes is investigated through temperature-dependent current-voltage measurements. The formation and retraction of nickel filaments along boron defects in the h-BN film are proposed as the resistive switching mechanism. The electrical data are corroborated with TEM analyses, confirming the viability of using temperature-dependent current-voltage measurements as a valuable tool for analyzing resistive switching phenomena in memristors made of 2D materials. The memristors exhibit wide current operation range, low standby currents, low cycle-to-cycle variability, and a large On/Off ratio.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Joachim Pasel, Johannes Haeusler, Dirk Schmitt, Helen Valencia, Joachim Mayer, Ralf Peters
Summary: The catalytic upgrading of CO2-based ethanol into valuable products, such as higher alcohols, is an increasingly popular research topic. Among these products, carbon-neutral n-butanol has the potential to replace a significant portion of conventional gasoline in the transportation sector. The Guerbet reaction, particularly the homo aldol condensation of acetaldehyde, has been studied as a promising synthesis route for n-butanol. In this study, the Temporal Analysis of Products methodology was used to investigate the reaction, with lanthanide oxides supported on activated carbon as catalysts. The research revealed the formation of butanol through the aldol condensation of acetaldehyde, as well as its decomposition into CO, CH4, and H2. Carbonaceous deposits were formed when acetaldehyde was pulsed onto the catalyst surface, but catalyst regeneration was successfully achieved through O2 pulsing. Other reaction routes leading to acidic acid, ethyl acetate, or diethyl ether were excluded through experimental tests.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Environmental Sciences
Aida M. Diez, Marta Pazos, M. Angeles Sanroman, Helen Valencia Naranjo, Joachim Mayer, Yury Kolen'ko
Summary: This study successfully synthesized and characterized fluoride-doped-TiO2 and demonstrated its applicability in solid-phase photodegradation of polyethylene films for the first time. After three weeks of UV A radiation using a low consumption LED lamp, the polyethylene films containing only 2% of the photocatalyst experienced nearly 50% weight loss, surpassing previously reported data. The results suggest the potential for future production of self-photodegradable plastics for environmental and wastewater treatment applications.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Materials Science, Coatings & Films
Grzegorz Sadowski, Rui Shu, Arnaud le Febvrier, Zhijia Han, Denis Music, Weishu Liu, Per Eklund
Summary: Mg3Bi2-based compounds have attracted great interest for thermoelectric applications near room temperature. Undoped p-type Mg3SbxBi2-x thin films were successfully synthesized using magnetron sputtering at a growth temperature of 200 ? on different substrates. The synthesized thin films exhibited a La2O3-type crystal structure and showed a semiconductive behavior. Increasing the Bi content was found to improve the electrical resistivity and power factor near room temperature. Thin films synthesized at low temperatures can open up novel possibilities for flexible devices on heat-sensitive substrates.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2023)
Article
Chemistry, Multidisciplinary
Inga K. Goetz, Janis A. Saelker, Marcus Hans, Bjorgvin Hjorvarsson, Jochen M. Schneider
Summary: Composition analysis at the nm-scale is crucial for understanding and optimizing additive manufacturing processes in bulk metallic glasses. However, differentiating nm-scale segregations from random fluctuations using atom probe tomography poses challenges due to limited spatial resolution and detection efficiency. The study shows that the elemental distribution in amorphous samples exhibits a random distribution, but heat-treated samples exhibit elemental segregation that increases in size with annealing time.
Article
Materials Science, Multidisciplinary
Soheil Karimi Aghda, Dimitri Bogdanovski, Lukas Lo, Heng Han Sua, Lena Patterer, Damian M. Holzapfel, Arnaud le Febvrier, Marcus Hans, Daniel Primetzhofer, Jochen M. Schneider
Summary: The effect of N-vacancy concentration on the elastic properties of cubic transition metal nitride thin films is systematically studied by density functional theory calculations. Experimentally validated results show that the elastic behavior of the transition metal nitrides depends on both the N-vacancy concentration and the valence electron concentration of the transition metal.
Article
Chemistry, Physical
Chongchong Tang, Michael Duerrschnabel, Ute Jaentsch, Michael Klimenkov, Martin Steinbrueck, Sven Ulrich, Marcus Hans, Jochen M. Schneider, Michael Stueber
Summary: Periodically stacked nanoscale V/C/Al multilayered thin film precursors were deposited and annealed in argon, leading to the formation of V2AlC MAX phase with undulation growth of nanolayers and preferential incorporation of Ar atoms into amorphous carbon nanolayers. Single-phase and basal-plane-oriented V2AlC films were formed at annealing temperatures above 560 degrees C. The annealed films exhibited high-density nanoscale Ar clusters/bubbles at grain boundaries, showing pronounced layered distribution characteristics, especially near the substrate/film interface. The heterogeneous incorporation of argon atoms or clusters in heterostructured films likely represents a common phenomenon during thin film nucleation and growth, with its impact on macroscopic properties still to be explored.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Philipp M. Wolf, Deborah Neuss, Tuan T. Tran, Eduardo Pitthan, Marcus Hans, Jochen M. Schneider, Daniel Primetzhofer
Summary: The composition and morphology changes of different Ti-based coatings under oxygen exposure and high temperatures were studied using a non-destructive and depth-resolved approach. It was found that different coatings exhibited different oxidic surface layers under various conditions, and the effects of oxygen and temperature varied among the coatings.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Denis Music, Sana Khayyamifar, Johan Hektor
Summary: The thermomechanical properties of thermoelectric material ZrNiSn in both amorphous and crystalline states were studied. It was found that the amorphous state has a lower thermal conductivity, which is beneficial for thermoelectric performance, but also lower resistance to thermal shock. On the other hand, the crystalline state has higher resistance to thermal shock, but also higher thermal conductivity.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
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)
