Article
Chemistry, Applied
Dongik Lee, Kideuk Nam, Jong-Seong Bae, Jihun Park, Mijeong Kang, Sung Heum Park, Ju Hyun Oh, Seunghun Lee
Summary: In this study, on-demand removable passivation was achieved using nanoscale paraffin layers created through a spin-coating technique. By optimizing the solution concentration and spin speed, complete surface coverage of nanoscale paraffin layers was achieved, confirming the applicability of paraffin coating as an on-demand removable passivation technique.
PROGRESS IN ORGANIC COATINGS
(2023)
Article
Materials Science, Multidisciplinary
Tiankun Wang, Sha Shiong Ng, Way Foong Lim, Hock Jin Quah, Muhammad Fadhirul Izwan Bin Abdul Malik, Wei Sea Chang
Summary: High-contrast green luminescence was achieved in molybdenum (Mo)-doped beta-phase gallium oxide (/3-Ga2O3) through sol-gel spin coating. The doping did not significantly alter the crystal structure, surface morphology, and energy bandgap of the films. The Mo-doped films exhibited a beta phase structure with smooth surface morphology, and the luminescence changed from blue to green, with improved contrast.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Gizem Birant, Jessica de Wild, Marc Meuris, Jef Poortmans, Bart Vermang
Summary: This study discusses the use of the spin-coating process as a sodium pre-deposition technique for Cu(In,Ga)Se-2 ultrathin film solar cells. The challenges of unevenly deposited salt layers and unplanned clusters of sodium salts are detected and addressed. The performance of solar cells with different amounts of sodium is assessed, and the importance of homogeneity of the sodium layer is emphasized through hyperspectral photoluminescence mapping and reflection measurements.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2022)
Article
Materials Science, Coatings & Films
B. Bhushan, A. Banerjee, Subodh Nath Patel, Debdipta Banik, Kirtiratan Godbole, K. Vishwanath, Saikat Mandal, K. Mondal
Summary: This study investigates the passivation tendency and corrosion resistance of a novel Fe66.59C11.70P7.58Mn0.37Si2.86Cr1.72Mo0.92B8.26 amorphous coating prepared from pig-iron deposited on mild steel using a high-velocity oxy-fuel (HVOF) thermal spray process. The micro-morphological features of the coatings were quantitatively evaluated. Various tests were conducted to understand the corrosion behavior, including polarization response, current-transient, gravimetric evaluations, and spectroscopic examination of the corrosion product. The results showed that the coatings had strong passivation due to the protective iron-chromate and phosphate phases.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Environmental Sciences
Manilal A. Madhavan, Soloman P. Antony
Summary: A novel electrocoagulation system with polarity shift ability was designed for the treatment of produced water, aiming to reduce electrode passivation issues. Experimental results showed that polarity changeover in the switching mode operation significantly improved oil removal efficiency compared to the conventional mode.
Article
Materials Science, Ceramics
B. Bhushan, A. Banerjee, Pavan Kumar Bijalwan, Subodh Nath Patel, A. N. Bhagat, Debdipta Banik, Nisheeth Kr. Prasad, Harikrishna Kancharla, K. Mondal
Summary: The amorphous coatings prepared from a newly developed composition showed excellent corrosion resistance and strong passivation tendency on mild steel. The coatings were produced using atmospheric plasma spray technique. Current-transient response and corrosion monitoring experiments were conducted to evaluate the passivation ability and corrosion immunity of the coatings. Extensive impedance measurements were performed to analyze the nature of the passive film on the coated samples. The presence of Fe substituted chromate, borate, and phosphate phases contributed to the outstanding passivation of the coatings.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Materials Science, Ceramics
Yuxia Zhu, Xiangqian Xiu, Fei Cheng, Yuewen Li, Zili Xie, Tao Tao, Peng Chen, Bin Liu, Rong Zhang, You-Dou Zheng
Summary: Beta-Ga2O3 thin films have been successfully prepared on (0001) sapphire substrate using a simple and effective sol-gel spin-coating method with post-annealing process. The films exhibit good crystallinity and smooth surface morphology, comparable or even better than other epitaxial methods. The single-domain-growth mode of beta-Ga2O3 thin film prepared on slightly off-angled (0001) sapphire substrate has been confirmed, showing potential applications in high-quality free-standing GaN substrates.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2021)
Article
Ecology
Amanda C. Northrop, Vanessa Avalone, Aaron M. Ellison, Bryan A. Ballif, Nicholas J. Gotelli
Summary: Incremental increases in driver variables, such as nutrients or detritus, can lead to abrupt shifts in aquatic ecosystems that exhibit diverse hysteretic responses, which require different management strategies to address the effects of high versus low rates of detrital enrichment.
Article
Energy & Fuels
Elena J. Cassella, Timothy Thornber, Robert D. J. Oliver, Mary E. O'Kane, Emma L. K. Spooner, Rachel C. Kilbride, Thomas E. Catley, Onkar S. Game, Alexandra J. Ramadan, David G. Lidzey
Summary: Defect management in perovskite solar cells through surface passivation is crucial for improving stability and efficiency. This study demonstrates the use of spray-coating technology to deposit iso-butylammonium bromide, resulting in the formation of a quasi-2D perovskite layer and significant improvement in device performance.
Article
Biology
Hinako Kidokoro, Yukio Saijoh, Gary C. Schoenwolf
Summary: Using high-resolution live imaging of zebrafish embryos, this study investigates the cellular dynamics underlying early heart morphogenesis and identifies two key cell behaviors, cell rearrangement and cell shape change, in shaping the heart tube. Left cells exhibit higher activity in these behaviors, driving more rapid convergence of the left primordium and rotation of the heart tube. Loss of Nodal signaling abolishes these asymmetric cell behaviors and convergence of the left and right heart primordia.
COMMUNICATIONS BIOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Guo-Liang Ma, Ang Gao, Zeng Liu, Wei-Ming Sun, Shan Li, Zu-Yong Yan, Wei-Yu Jiang, Bing-Yang Sun, Xiao-Hui Qi, Pei-Gang Li, Wei-Hua Tang
Summary: In this study, a self-powered deep ultraviolet photodetector based on Ga2O3/BFO heterojunction was fabricated, showing excellent deep UV signal detection ability and potential for self-powered deep UV photodetection applications.
IEEE SENSORS JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Matthias Wurdack, Tinghe Yun, Eliezer Estrecho, Nitu Syed, Semonti Bhattacharyya, Maciej Pieczarka, Ali Zavabeti, Shao-Yu Chen, Benedikt Haas, Johannes Mueller, Mark N. Lockrey, Qiaoliang Bao, Christian Schneider, Yuerui Lu, Michael S. Fuhrer, Andrew G. Truscott, Torben Daeneke, Elena A. Ostrovskaya
Summary: Atomically thin transition metal dichalcogenide crystals have exceptional optical properties. Encapsulation of these crystals in ultrathin Ga2O3 glass can enhance their optical performance and protect them from further material deposition. Ga2O3 is highly suitable for large-scale passivation and protection of monolayer TMDCs in functional heterostructures.
ADVANCED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Wenrui Zhang, Wei Wang, Jingxuan Wei, Shihong Xia, Jianguo Zhang, Li Chen, Dongyang Han, Keming Jiang, Zhenhai Yang, Shen Hu, Li Ji, Jichun Ye
Summary: In this study, we integrate an ultrathin Al2O3 capping layer to improve the performance of ε-Ga2O3 MSM photodetectors. The Al2O3 layer effectively reduces the dark current, increases the photocurrent and response speed. The surface passivation mechanism involves the reduction of surface defects and the reconstruction of a faster surface transport channel. The Al2O3/ε-Ga2O3 MSM photodetector achieves high responsivity, detectivity, photo-to-dark ratio, and UV-vis rejection ratio.
MATERIALS TODAY PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Ching-Chuan Hsu, Yan-Ren Hou, Jing-Shiuan Niu, Wen-Chau Liu
Summary: The new device structure incorporating Ga2O3 current blocking and surface passivation layers significantly improves the performance of GaN-based LEDs. The appropriate thicknesses of Ga2O3 CBL and SPL lead to substantial enhancements in light output power and efficiency compared to conventional LEDs.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Energy & Fuels
Yameen Ahmed, Deepak Thrithamarassery Gangadharan, Mohammad Reza Kokaba, Vishal Yeddu, Muhammad Awais, Dongyang Zhang, Vahid Kamraninejad, Makhsud I. Saidaminov
Summary: In this study, perovskite solar cells (PSCs) were fabricated using scalable methods in ambient air, achieving high efficiency and excellent tolerance to oxygen and moisture. The use of a resurfacing strategy improved charge carrier recombination and the devices showed stable performance without encapsulation.
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)