Article
Engineering, Electrical & Electronic
Amit Kumar Singh, Saurabh Yadav, P. K. Kulriya, Y. S. Katharria
Summary: In this study, the annealing effects of sapphire substrate on beta-Ga2O3 thin films were investigated. The results showed that annealing improved the crystalline quality of the thin films and confirmed the presence of Ga-O bonds. The annealing temperature of the sapphire substrate influenced the film quality and the diffusion of aluminum atoms.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Kunpeng Ge, Dongdong Meng, Xu Chen, Xu Wang, Xueqiang Ji, Zhengwei Chen
Summary: A solar-blind UV photodetector (PD) with a traditional MSM structure was fabricated using an a-Ga2O3 film deposited on an m-plane sapphire substrate by RF magnetron sputtering method. The optimum deposition temperature for the pure-phase (300) a-Ga2O3 film was determined to be 775°C based on XRD, AFM, and deposition rate analyses. The bandgap of the prepared a-Ga2O3 film was found to be 5.3 eV through optical absorbance measurement. The (300) a-Ga2O3 film based PD exhibited a responsivity of 659.6 A/W and a photo-to-dark ratio of 1554 under 254 nm light illumination. The response time constants at a bias voltage of 5 V were estimated to be (0.28, 1.52 s) and (0.04, 0.62 s), respectively.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Sakal Pech, Sara Kim, Nam-Hoon Kim
Summary: This study investigates the crystalline quality of polycrystalline beta-Ga2O3 films through rapid thermal annealing. The results show that by annealing at 900°C under a N2 gas atmosphere for 45 minutes, optimized polycrystalline beta-Ga2O3 films with improved crystal structure can be obtained.
Article
Chemistry, Multidisciplinary
Xinke Liu, Shengqun Hu, Jiangliu Luo, Xiaohua Li, Jing Wu, Dongzhi Chi, Kah-Wee Ang, Wenjie Yu, Yongqing Cai
Summary: The study demonstrates an effective method for enhancing the optical properties of photodetectors, enabling simultaneous detection of broad-spectrum emissions.
Article
Chemistry, Physical
Yuan Yuan, Zhengyuan Li, Xiaohu Hou, Xiaolong Zhao, Mengfan Ding, Shunjie Yu, Zhiwei Wang, Jinyang Liu, Guangwei Xu, Zhitai Jia, Xutang Tao, Wenxiang Mu, Shibing Long
Summary: This study demonstrates the fabrication of an ultrahigh-performance /3-Ga2O3 solar-blind photodetector using unique bottom-up Zn diffusion doping engineering. The device exhibits low dark current, excellent crystal quality, high photo-to-dark-current ratio, high responsivity, and considerable rejection ratio. This work provides novel strategies for the future development of high-performance photodetectors.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Yi Lu, Xuecui Zou, Shibin Krishna, Xiao Tang, Zhiyuan Liu, Mingtao Nong, Che-Hao Liao, Saravanan Yuvaraja, Mohamed Ben Hassine, Hossein Fariborzi, Xiaohang Li
Summary: By employing thermal mismatch engineering, a freestanding Ga2O3 membrane can be exfoliated from a pre-deposited Ga2O3/AlN template in a high-temperature environment. This technique allows the fabrication of vertical deep ultraviolet (DUV) photonics devices, providing better thermal management and avoiding the use of costly Ga2O3 substrates.
MATERIALS TODAY PHYSICS
(2023)
Article
Chemistry, Physical
Haoran Li, Yuehui Wang, Jia Cao, Yaping Qi, Jie Yu, Zhengang Dong, Jiaying Shen, Shan Li, Yucheng Jiang, Weihua Tang, Zhenping Wu
Summary: The crystallinity and photoresponse properties of epitaxial fi-Ga2O3 films can be modified by selecting the substrate with different miscut angles. Fi-Ga2O3 thin films grown on sapphire substrate with 6 degrees miscut angle show enhanced responsivity and specific detectivity, demonstrating an effective strategy to develop high performance solar-blind photodetectors in the future.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Optics
Zhiguo Hu, Qian Cheng, Tao Zhang, Yuxuan Zhang, Xusheng Tian, Yachao Zhang, Qian Feng, Wang Xing, Jing Ning, Chunfu Zhang, Jincheng Zhang, Yue Hao
Summary: In this study, beta-Ga2O3 films were deposited on sapphire substrates by MOCVD, and solar-blind photodetectors with MSM structure were fabricated. The effects of growth temperature on the morphology, composition, crystalline quality and optical properties of the films were investigated. The photodetector fabricated at 850 degrees C showed a large photocurrent, high responsivity, high photo-to-dark current ratio, high detectivity, and fast response recovery time.
JOURNAL OF LUMINESCENCE
(2023)
Article
Materials Science, Coatings & Films
Jui-Che Chang, Jens Birch, Gueorgui Kostov Gueorguiev, Babak Bakhit, Grzegorz Greczynski, Fredrik Eriksson, Per Sandstrom, Lars Hultman, Ching-Lien Hsiao
Summary: We have successfully grown high-quality Ta3N5 films on sapphire substrates using magnetron sputter epitaxy. The addition of oxygen gas and a Ta2O5 seed layer promotes the formation of single-phase polycrystalline Ta3N5 films.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Xiao Tang, Kuang-Hui Li, Che-Hao Liao, Dongxing Zheng, Chen Liu, Rongyu Lin, Na Xiao, Shibin Krishna, Jose Tauboada, Xiaohang Li
Summary: This study demonstrates the epitaxial growth of beta-Ga2O3 (-201) thin films on a non-six-fold symmetric substrate, CeO2 (001). The results show that the epitaxial beta-Ga2O3 thin films on CeO2 have high crystallization quality and can potentially be used for various devices. Moreover, this work paves the way for constructing heterostructures between beta-Ga2O3 and other cubic-phase functional materials.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Chemistry, Physical
Junzhu Li, Mingguang Chen, Abdus Samad, Haocong Dong, Avijeet Ray, Junwei Zhang, Xiaochuan Jiang, Udo Schwingenschlogl, Jari Domke, Cailing Chen, Yu Han, Torsten Fritz, Rodney S. Ruoff, Bo Tian, Xixiang Zhang
Summary: This study demonstrates a method for achieving high-quality wafer-scale single-crystal graphene on sapphire substrates, which opens up new possibilities for electronic and optoelectronic applications by epitaxially growing graphene at the Cu(111)/sapphire interface and detaching the Cu film.
Article
Materials Science, Multidisciplinary
Zhengwei Chen, Kunpeng Ge, Dongdong Meng, Xu Chen
Summary: In this study, epitaxial Ga2O3 films were successfully grown on sapphire substrates using RF magnetron sputtering method. The films exhibited different polymorphs depending on the substrate plane, and had a bandgap of 4.88-5.30 eV.
Article
Engineering, Electrical & Electronic
Vera M. Kalygina, Alexander V. Tsymbalov, Aleksei Almaev, Bogdan O. Kushnarev, Vladimir L. Oleinik, Julianna V. Petrova, Pavel A. Yunin
Summary: In this study, the effect of radiation below the beta-Ga2O3 band-gap on the photoelectric characteristics of gallium oxide thin films based UV radiation detectors is investigated. The gallium oxide film is deposited using radio frequency magnetron sputtering, and interdigital electrodes are formed with an inter-electrode distance of 30 μm. The detectors show high photocurrent values under irradiation with a wavelength of 254 nm and intensity of 780 μW/cm^2. Persistent photoconductivity and increased stability of the detectors are attributed to the high concentration of traps in the Ga2O3 film and their recharging under UV irradiation.
IEEE SENSORS JOURNAL
(2023)
Article
Materials Science, Ceramics
Chen Wang, Wei-Hang Fan, Yu-Chao Zhang, Pin-Chun Kang, Wan-Yu Wu, Dong-Sing Wuu, Shui-Yang Lien, Wen-Zhang Zhu
Summary: This study investigated the properties of Sn-doped Ga2O3 films deposited on sapphire substrates through RF magnetron sputtering at different oxygen flow ratios. In situ optical emission spectroscopy was used to monitor the plasma radicals generated during the deposition process. The films showed amorphous structures with nanoparticles and a decreased deposition rate with increasing oxygen flow ratio. The conductive mechanism of the films was attributed to the ratio of substitutional Sn atoms and the SnO2 phase. Metal-semiconductor-metal solar-blind photodetectors were developed and analyzed to demonstrate the effect of oxygen flow ratio.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Electrical & Electronic
Xu Cao, Yanhui Xing, Jun Han, Junshuai Li, Tao He, Xiaodong Zhang, Jiahao Zhao, Baoshun Zhang
Summary: Heterogeneous epitaxy of epsilon-Ga2O3 films on c-plane sapphire was conducted by metal-organic chemical vapor deposition method. The effects of thickness on crystal quality and morphology of epsilon-Ga2O3 films were analyzed. A high-quality epsilon-Ga2O3 film with good optical properties was obtained.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Materials Science, Coatings & Films
Hui-Ping Fan, Xin-Xian Yang, Fu-Hsing Lu
Summary: In this study, quaternary titanium-aluminum oxynitride films with various nitrogen and oxygen compositions were successfully produced by changing the reactive gas and gas flow ratio. The obtained films showed different structures and properties.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Xin-Xian Yang, Fu-Hsing Lu
Summary: This article discusses the use of titanium oxynitride (TiNxOy) thin films with tunable physical and chemical properties in various fields. By adjusting the air/argon flow ratio, the films can exhibit different crystalline or amorphous features, as well as varying carrier concentration, Hall mobility, resistivity, and optical bandgaps. These findings have implications for photoelectrochemical performance assessment.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Electrical & Electronic
Qi-Zhen Chen, Chun-Yan Shi, Ming-Jie Zhao, Peng Gao, Wan-Yu Wu, Dong-Sing Wuu, Ray-Hua Horng, Shui-Yang Lien, Wen-Zhang Zhu
Summary: This study investigates the transparent indium-gallium-zinc oxide thin film transistor (IGZO-TFT) prepared by all plasma enhanced atomic layer deposition (PEALD). The properties of the IGZO film and IGZO-TFT based on different In2O3 cycle ratios are examined due to the considerable impact of chemical composition on the performance of IGZO TFTs. The IGZO film prepared by PEALD exhibits amorphous state with excellent conformity and uniformity. By applying a-IGZO films with different In2O3 cycle ratios, a satisfactory electrical performance of the transistor is achieved, with a threshold voltage (V-th) of 1.7 V, a saturation mobility (mu(sat)) of 8.8 cm(2)/Vs, a subthreshold swing (SS) of 0.2 V/decade, and an I-ON/I-OFF of 2.2 x 10(8). This work provides a new approach for achieving transparent TFTs that are more suitable for practical commercial applications.
IEEE ELECTRON DEVICE LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Chien-Yie Tsay, Yun-Chi Chen, Hsuan-Meng Tsai, Fu-Hsing Lu
Summary: In this study, n-type zinc-tin oxide (ZTO) and p-type nickel oxide (NiO) semiconductor thin films were prepared by the sol-gel spin coating process. The effects of 4 at% Mg and Cu doping on the microstructural, optical, and electrical characteristics of NiO thin films, as well as the physical properties of ZTO thin films, were investigated. Furthermore, a bi-layered ZTO/NiO thin film was developed on Corning glasses to create a visible light transparent p-n heterojunction ultraviolet (UV) photodetector. Mg doping improved visible transparency and increased optical bandgap energy, while Cu doping decreased visible transparency and narrowed the optical bandgap energy. The electrical properties of NiO sol-gel thin films were enhanced through Mg and Cu doping. The n-ZTO/p-NiO:Mg photodetector exhibited the highest rectification ratio and on-to-off current ratio. Under UV illumination, all three types of devices displayed self-powered behavior, with the Mg and Cu-doped NiO devices showing better photoresponse characteristics than the undoped NiO device. Mg-doped NiO devices demonstrated the highest photoconductivity gain and sensitivity, as well as acceptable response speed and responsivity, with an applied reverse bias of 1 V.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Ceramics
Zengjie Zhou, Guannan Li, Xin Gong, Yuming Lu, Jianfeng Tang, Sam Zhang
Summary: A novel Te-doped 0.7BiFe1_xTexO3-0.3BaTiO3 ceramics with enhanced ferroelectric properties were designed and synthesized. The introduction of Te reduced the Fe2+ concentration and improved the insulating performance. The Te-induced structure distortion resulted in a large remnant polarization and relaxed ferroelectric behavior.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Wenling Xie, Yiman Zhao, Shunian Chen, Bin Liao, Sam Zhang, Qingsong Hua, Guangyu He
Summary: The AlN monolayer and (Al/AlN)5 multilayer coatings were deposited on AZ31 magnesium alloys using filtered cathodic vacuum arc technology. The AlN monolayer had a dense structure with some holes at the coating/substrate interface. The (Al/AlN)5 multilayer exhibited a compact layered structure with interrupted holes by the Al/AlN interface. Both AlN monolayer and (Al/AlN)5 multilayer showed excellent corrosion resistance, with low corrosion current densities of 1.91 x 10-6 and 1.11 x 10-6 A/cm2 respectively. The improved corrosion resistance of the (Al/AlN)5 multilayer can be attributed to its denser layered structure, better adhesion strength, crack propagation resistance, and deformation coordination between coating and substrate during corrosion.
Article
Crystallography
Chao-Chun Yen, Anoop Kumar Singh, Yi-Min Chung, Hsin-Yu Chou, Dong-Sing Wuu
Summary: This paper highlights the effects of furnace pressure, crucible rotation, and pulling rate on interstitial oxygen (O-i) concentrations and micro-defects during growth in a Czochralski single-crystal silicon (CZ-Si) growth furnace. Different set-points of furnace pressure and crucible rotation were controlled to achieve different degrees of O-i, which was found to have a positive correlation with furnace pressure and crucible rotation. The influence of different pulling rates on the formation of micro-defects was also investigated, with the transformation from liquid to solid being responsible for their generation. The study concludes that growth using a CZ-Si growth furnace should be carried out with low furnace pressure, low crucible rotation, and low pulling rate to reduce micro-defects.
Article
Chemistry, Physical
Xinghong Cai, Qiang Yang, Yao Tong, Sam Zhang, Min Wang
Summary: A novel method for the detection and inactivation of aflatoxin B1 (AFB1) based on first-principles method is presented. The adsorption and inactivation of AFB1 on g-C3N5 nanotubes with the OH group was achieved. The introduction of the OH group destroys the C=C bond of AFB1 and forms a new substance AFB1-9-hydroxy (AFB1-OH), resulting in the inactivation of AFB1 toxicity.
SURFACES AND INTERFACES
(2023)
Article
Chemistry, Physical
Hsin-Yu Chou, Chih-Wei Lo, Kai-Ping Chang, Wei-Yi Shi, Chao-Chun Yen, Dong-Sing Wuu
Summary: Cadmium-free perovskite quantum dots (QDs) with a new structure of CsPbBr3/Cs4PbBr6 were synthesized using a chemical solution method. The perovskite QDs were passivated with a SiO2 layer and dispersed in a polar solvent to maintain their luminous properties. A photolithography process was used to fabricate pixelated perovskite QDs on a glass substrate, and a black matrix was employed to reduce crosstalk between pixels. Applying these pixelated perovskite QDs as a color conversion layer in blue light micro-LED display, excess blue light was reflected back to the QDs using a 23-layer distributed Bragg reflector (DBR), resulting in increased luminous intensity of green light and decreased transmittance of blue light. Ultimately, the attachment of graph pixelated perovskite QDs to the blue light display enabled monochrome/area color and full-color micro-LED display.
SURFACES AND INTERFACES
(2023)
Article
Engineering, Electrical & Electronic
Kai-Ping Chang, Yu-Wun Chien, Po-Hsiang Wang, Chao-Chun Yen, Ying-Xiang Lin, Ying-Jie Gao, Wan-Yu Wu, Dong-Sing Wuu
Summary: In this study, a blue transparent micro-LED display with a chip size of 20 μm × 20 μm, a pixel density of 152 PPI, a pixel spacing of 150 μm, and a resolution of 64 × 32 has been successfully fabricated. ITO/Ag/ITO transparent layers were deposited by high-power impulse magnetron sputtering. The electrical properties of the indium tin oxide (ITO) layers were analyzed using sheet resistance, while surface morphology was examined using scanning electron microscopy, transmission electron microscopy, and atomic force microscopy. The results show that the ITO/Ag/ITO structure with 20 nm thick Ag has a lower sheet resistance (3.36 Cl/sq) and sufficient visible light transmittance (80.45%). The visible light transmittance of the ITO/Ag/ITO layers increased to 86% after rapid thermal annealing. Furthermore, surface roughness was minimized and sheet resistance was further reduced, resulting in ohmic contact on n-GaN for transparent micro-LED display applications.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Anoop Kumar Singh, Chao-Chun Yen, Chun-Fan Wen, Ray-Hua Horng, Dong-Sing Wuu
Summary: Researchers have developed a NO gas sensor with high sensing response for measuring NO gas levels. The sensor is made of ZnO:ZnGa2O4 dual-phase films and exhibits high selectivity and quick response time.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Ting -Yu Chang, Anoop Kumar Singh, Jhih-Hong Shao, Chiung-Yi Huang, Jia-Min Shieh, Dong-Sing Wuu, Po-Liang Liu, Ray-Hua Horng
Summary: Gas sensors play a crucial role in various industrial and environmental monitoring applications. This study investigates the impact of plasma surface treatment on the performance of ZnGa2O4-based NO gas sensors, and the results show that Ar plasma treatment significantly improves the sensor's response. These findings provide valuable insights into enhancing the performance of gas sensors through surface modification techniques.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Zhi-Xuan Zhang, Shi-Cong Jiang, Wan-Yu Wu, Peng Gao, Linqin Jiang, Yu Qiu, Dong-Sing Wuu, Feng-Min Lai, Wen-Zhang Zhu, Lien SY
Summary: In this paper, Si derived from the SiNx sub-cycle in plasma-enhanced atomic layer deposition (PEALD) was used as a dopant to improve the ohmic contact resistance of GaN. The highest carrier concentration and lowest resistivity were achieved in a Si-doped GaN film deposited at a SiNx sub-cycle ratio of 20%.
SURFACES AND INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Chun-Yan Shi, Qi-Zhen Chen, Zhi-Xuan Zhang, Chia-Hsun Hsu, Ming-Jie Zhao, Xiao-Ying Zhang, Peng Gao, Wan-Yu Wu, Dong-Sing Wuu, Chien-Jung Huang, Shui-Yang Lien, Wen-Zhang Zhu
Summary: In this study, indium-free GZO thin films were successfully deposited using plasma-enhanced atomic layer deposition (PEALD) and used as the channel layer in thin film transistors (TFTs). Modifying the cycle ratio of Ga2O3 to ZnO can affect the film properties, with the 7.5% cycle ratio GZO film showing low carrier concentration and high Hall mobility.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Chia-Hsun Hsu, Zhi-Xuan Zhang, Chun-Yan Shi, Pao-Hsun Huang, Wan-Yu Wu, Dong-Sing Wuu, Peng Gao, Chien-Jung Huang, Shui-Yang Lien, Wen-Zhang Zhu
Summary: In this study, high-performance ITO thin films were prepared using PEALD method. The film thickness and tin content can be controlled by adjusting the cycle ratio, leading to low resistivity, high mobility, and high doping efficiency.
JOURNAL OF MATERIALS CHEMISTRY C
(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)
