Article
Chemistry, Physical
Bo Feng, Haiyuan Lv, Jie Liu, Rongrong Chen, Hongyan Zhu, Xinyu Han, Caina Luan, Hongdi Xiao
Summary: In this study, high-quality p-type CuInO2 epitaxial thin films were successfully grown on GaN wafers using pulsed laser deposition technology. The films exhibited a bandgap of around 3.99 eV. The quality of the CuInO2 thin film improved with decreasing oxygen pressure, and the highest quality film demonstrated high photoresponsivity and fast response speed in a solar-blind wavelength.
APPLIED SURFACE SCIENCE
(2022)
Article
Computer Science, Information Systems
Xiaoyu Ding, Xu Yuan, Tao Ju, Guohao Yu, Bingliang Zhang, Zhongkai Du, Zhongming Zeng, Baoshun Zhang, Xinping Zhang
Summary: A technique called ion implantation was used to passivate p-GaN and create a normally off p-GaN/AlGaN/GaN HEMT. Through experiments, it was determined that an ion implantation energy of 20 keV and a dosage of 1.5 x 10(13) cm(-2) were required for passivation. Annealing at 400 degrees C was found to be ideal for obtaining a normally off p-GaN HEMT with desirable electrical properties.
Article
Engineering, Aerospace
M. Sznajder, P. Seefeldt, T. Sproewitz, T. Renger, J. H. Kang, R. Bryant, W. Wilkie
Summary: Metallized thin films are commonly used for solar sail membranes in interplanetary space, but can experience degradation due to blister formation caused by low energy protons. Testing exposed specimens at simulated environmental conditions showed color changes and reduced reflectivity, affecting propulsion characteristics of a sailcraft under similar conditions.
ADVANCES IN SPACE RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Zhouzhou Wang, Bowen Sheng, Yiqing Chen, Sharif Md. Sadaf, Jinglin Li, Jiajia Yang, Jun Song, Lin Yao, Ying Yu, Lei Zhu, Xinqiang Wang, Zhen Huang, Baowen Zhou
Summary: This work presents a novel photocatalytic architecture of AuIn NPs/GaN NWs/Si for the production of green syngas from bio-derived glycerol. The system shows remarkable activity and selectivity under mild conditions, without requiring additional energy input.
Article
Chemistry, Multidisciplinary
Yue Yin, Bingyao Liu, Qi Chen, Zhaolong Chen, Fang Ren, Shuo Zhang, Zhetong Liu, Rong Wang, Meng Liang, Jianchang Yan, Jingyu Sun, Xiaoyan Yi, Tongbo Wei, Junxi Wang, Jinmin Li, Zhongfan Liu, Peng Gao, Zhiqiang Liu
Summary: This study successfully achieved epitaxial growth of single-crystalline GaN film on a WS2-glass wafer, paving the way for heterogeneous integration of semiconductors and breaking through the design and performance limitations of devices induced by substrate restriction.
Article
Chemistry, Physical
Wanglong Wu, Chuankai Liu, Lixiang Han, Xiaozhou Wang, Jingbo Li
Summary: We have developed a novel high sensitive ultraviolet (UV) photodetector based on AlGaN/n-GaN/p-GaN heterostructure high electron mobility transistor (HEMT) on sapphire substrates. The photodetectors demonstrate ultra-low dark current and high light on/off ratio under UV LED irradiation. They also exhibit high photoresponse speed and overall high performance in terms of photoresponsivity, EQE, detectivity, and stability. The proposed photodetectors have the potential for applications in UV communication, Internet of Things, and medical treatment.
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Electrical & Electronic
Jongseok Kim, Won-Jin Choi, Keuk Kim, Donghwan Kim
Summary: We propose a nondestructive method to estimate the peak wavelength of the active QW region in a grown VCSEL epi-wafer, without the need for metal electrodes. The method utilizes room temperature electroluminescence measurements and analyzes the angle dependence of the EL properties to determine the detuned wavelength of the active QW region. The results demonstrate the potential of this method for optically analyzing the challenging active QW region in completed VCSEL epi-structures.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Crystallography
Heng Ma, Huiyun Tian, Zhongxue Wang, Kang He, Yuexiang Wang, Qingpu Zhang, Deyun Liu, Zhongyu Cui
Summary: The effect of charging conditions on hydrogen damage to Q690 steel is studied through electrochemical hydrogen charging, microstructure observation, and slow strain rate tensile tests. The charging current density and time have a significant impact on hydrogen-induced blistering, cracking behavior, and mechanical properties of the steel. The results show that the charging conditions affect the characteristics of hydrogen-induced blistering and the morphology, number, size, and location of internal cracks. Higher hydrogen concentrations lead to deeper cracks. High current density is responsible for the initiation of blisters. Excessive hydrogen pressure causes internal cracks, leading to the degradation of mechanical properties and the transition from ductile fracture to brittle fracture.
Article
Multidisciplinary Sciences
James C. Gallagher, Michael A. Mastro, Mona A. Ebrish, Alan G. Jacobs, Brendan P. Gunning, Robert J. Kaplar, Karl D. Hobart, Travis J. Anderson
Summary: In order to improve the manufacturing process of GaN wafers, inexpensive wafer screening techniques are needed to provide feedback and prevent fabrication on low quality or defective wafers. This research project successfully trained four different machine learning models using low resolution wafer scale optical profilometry data. The models can predict device pass and fail with 70-75% accuracy and predict the wafer yield within 15% error on the majority of wafers.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Physical
Lizeth Sanchez, Hongbo Cong
Summary: This study investigates the effects of AC and cathodic protection (CP) potentials on the evolution and absorption of hydrogen in carbon steel 1010. The results show that hydrogen evolution and absorption occur under CP and AC, with hydrogen permeation controlled by bulk diffusion. The hydrogen uptake increases significantly with more negative CP potentials and higher AC voltages. The synergy between CP potential and AC voltage is found to have the highest impact on hydrogen behavior in steel.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Electrical & Electronic
Yi Gu, Hongzhen Wang, Bo Yang, Dongdong Tian, Liyi Yang, Tao Li, Xiumei Shao, Dafu Liu, Xue Li, Haimei Gong, Jiaxiong Fang
Summary: The relationship between the photoluminescence properties of InGaAs detector epi-wafers and the performance of focal plane arrays has been established through measurements of various samples. The average signal, dark signal, and noise of the fabricated focal plane arrays were found to be correlated to the photoluminescence intensities and nonuniformities of the epi-wafers. The average response signal increases with increased photoluminescence, while the signal nonuniformity and dark signal are significantly related to the nonuniformity of photoluminescence intensity.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Physics, Applied
Toshihiro Nakamura, Tomoaki Nishimura, Kazuo Kuriyama, Tohru Nakamura, Atsushi Kinomura
Summary: The research investigates gamma-ray-induced photoemissions from GaN single crystal wafers at room temperature, showing different emission spectra with intensity proportional to wafer thickness, suggesting the potential use of GaN as a gamma-ray detector.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Tao Zhang, Qian Cheng, Zhiguo Hu, Yifan Li, Jinbang Ma, Yixin Yao, Yan Zuo, Qian Feng, Yachao Zhang, Hong Zhou, Jing Ning, Chunfu Zhang, Jincheng Zhang, Yue Hao
Summary: Ga2O3 films were deposited on non-polar sapphire and epi-GaN substrates at low temperature by MOCVD. The film quality was found to be the best on r-plane sapphire substrate, while the Ga2O3 film on GaN substrate had better crystalline quality compared to that on a-plane sapphire substrate.
Article
Chemistry, Multidisciplinary
Lulu Wang, Shenyuan Yang, Fan Zhou, Yaqi Gao, Yiwei Duo, Renfeng Chen, Jiankun Yang, Jianchang Yan, Junxi Wang, Jinmin Li, Yanfeng Zhang, Tongbo Wei
Summary: This study demonstrates the epitaxy growth and mechanical transfer of high-quality III-nitrides using 2D materials weakly bonded by van der Waals force. The research shows the achievement of wafer-scale transferrable GaN epilayer with low dislocation density through an AlN/h-BN composite buffer layer and its application in flexible InGaN-based LEDs. First-principles calculations reveal the stronger adsorption energy of Al atoms on O2-plasma-treated h-BN compared to Ga atoms, and propose a strain-relaxation model for nitrides on h-BN.
Article
Engineering, Mechanical
Jisheng Pan, Yusen Wu, Zhijia Zhuo, Hao Wang, Qiongbin Zheng, Qiusheng Yan
Summary: A magnetorheological electro-Fenton composite polishing technique is proposed for high-efficiency polishing of GaN. The tribological behavior of GaN under different conditions (ambient medium, H2O2, and catalyst) is investigated using a magnetorheological micropolishing nose as a frictional substrate. The results show that hydroxyl radicals (·OH) effectively corrode GaN and increase its coefficient of friction. The electro-Fenton reaction, frictional heat, and shear stress all play a role in material removal and determine wear behavior and morphology. Addition of H2O2 at a rate of 0.30 g/min with Fe-C as the catalyst achieves the best material removal effect. The findings support the use of GaN magnetorheological electro-Fenton composite polishing.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Materials Science, Coatings & Films
Yanchun Xie, Xiaodong Wang, Shenshen Cui, Jiali Hu, Yongcun Wei, Yi Lian, Anwu Xuan, Bin Yu, Erlin Zhang
Summary: In this study, Ti-xFe (x = 3,5,9 wt%) alloys were surface modified by micro-arc oxidation (MAO) to improve their antimicrobial properties and biocompatibility. The results showed that increasing the oxidation voltage greatly enhanced the roughness and hydrophilicity of Ti-xFe-MAO alloys. The Ti-xFe alloys micro-arc oxidized at 250 V and 300 V exhibited improved corrosion resistance and excellent antimicrobial and cytocompatibility properties, making them suitable for orthopedic implant materials.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Yuting Hao, Zuoyan Ye, Lili Wang, Minheng Ye, Hui Dong, Chao Wang, Yunchen Du
Summary: This study focuses on the modification of PEO coatings on Ta-12W alloy using NH4F additive. The results show that ultra-low porosity coatings can be prepared by optimizing the NH4F content. The formation process of specific structures on the coating surface is discussed, and the effects of NH4F concentration and treatment duration on coating characteristics are investigated.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Yuanzhuo Liu, Linjiang Chai, Tao Yang, Chaodan Hu, Chuanmei Wang, Guoqiang Xi
Summary: By employing a pulsed laser, laser cladding was performed on IN718 alloy pre-coated with CrCoNi-TiC/SiC powders and three defect-free coatings were successfully prepared. The addition of TiC and SiC powders generated fine carbides dispersed in the coatings and led to changes in grain and substructure morphologies, resulting in increased hardness and wear resistance.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
M. Ghaemi, A. Lopez-Cazalilla, K. Sarakinos, G. J. Rosaz, C. P. A. Carlos, S. Leith, S. Calatroni, M. Himmerlich, F. Djurabekova
Summary: The use of high-power impulse magnetron sputtering can result in dense and uniform niobium films on all surfaces of superconducting rf cavities, as simulated and investigated in this study.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Jiaheng Du, Xinli Fan, Dongqin Xiao, Wuxiang Wang, Yiran Yin, Zhong Li, Kui He, Yanfei Tan, Jiyuan Yan, Gangli Liu, Ke Duan
Summary: This study investigated the electrophoretic deposition (EPD) of magnesium oxide (MgO) coatings on micro-arc oxidized titanium (MAO-Ti) and evaluated their in vitro antibacterial properties and biocompatibility. The results showed that MgO coatings significantly reduced bacterial numbers and biofilm formation, while also demonstrating good cytocompatibility and induction of osteoblast mineralization.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Samiksha Moharana, Yuichi Otsuka, R. Gnanamoorthy
Summary: The addition of titania to HAp coatings improves their wear resistance and reduces damage to titanium implants caused by debris generation. This study evaluates the fretting wear resistance of titania-added HAp suspension plasma spray coating and finds that it exhibits reduced friction coefficient and increased wear resistance.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Li-Ping Wu
Summary: The functional hazenite coating deposited on AZ31 Mg alloy showed improved roughness and hydrophilicity, enhanced biocompatibility, reduced degradation rate, and decreased susceptibility to stress corrosion cracking.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Ning Tian, Delei Xu, Jinfei Wei, Bucheng Li, Junping Zhang
Summary: This study reports the preparation of a superhydrophobic and anti-bacterial fabric for face masks. The fabric exhibits high superhydrophobicity and excellent moisture resistance, enabling functionality effectiveness in cold weather conditions. The fabric also demonstrates remarkable anti-bacterial activity against E. coli, attributed to the synergistic effect of superhydrophobicity and embedded ZnO nanoparticles. This superhydrophobic anti-bacterial fabric holds great potential for various practical applications in personal protective equipment, healthcare, and disease prevention.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Katharina Beck, Anke S. Ulrich, Andreas K. Czerny, Emma M. H. White, Martin Heilmaier, Mathias C. Galetz
Summary: Refractory metal based alloys have great potential as structural materials for high-temperature applications due to their high melting points. However, they are prone to catastrophic oxidation at around 700 degrees C. This study investigated the effect of aluminium diffusion coatings on the oxidation resistance of pure molybdenum, niobium, tantalum, and tungsten. The results showed that the aluminization improved the oxidation behavior and decreased the oxide growth rate for molybdenum and tantalum.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Wenwen Shuai, Haijun Dou, Zhichen Guan, Wei Qian, Zhibao Li, Yinqun Hua, Jie Cai
Summary: This study synthesized (Y1-xLax)3Al5O12 (x = 0, 0.1, 0.2, 0.3) materials by doping lanthanum ions, and found that the doped materials exhibited improved mechanical properties and thermal expansion coefficient, as well as enhanced resistance to CMAS corrosion. These materials have potential applications.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Xianglei Liu, Jiahui Ding, Wanbo Hou, Xinhao Shi, Tao Feng, Xiangyuan Meng, Shifeng Wen, Mingde Tong, Zhufeng Yue
Summary: A composite coating was developed to improve the adhesion, wear resistance, and corrosion resistance, which exhibited significant enhancements in these properties.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Hongxuan Xing, Jidong Li, Xianwei Hu, Liang Tian, Renyun Zhang, Yiyong Wang
Summary: By depositing a Cu/Co-Mo corrosion-resistant plating layer on the surface of 6061 Al alloy, the bonding strength between the alloy and the plating layer can be improved and the corrosion resistance can be enhanced. The composite coating forms an obvious three-layer structure with Co-Mo coating exhibiting amorphous characteristics and Co3Mo phase composition. The composite coating improves the corrosion resistance and hardness of the substrate, effectively protecting the 6061 Al alloy.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Fan Yang, Debin Wang, Tianrun Li, Baijun Yang, Suode Zhang, Jianqiang Wang
Summary: The impact-corrosion behavior of monolayer and hierarchical Fe-based amorphous coatings fabricated by HVAF was investigated in 3.5 wt% NaCl solution. The monolayer coating exhibits corrosion failure with increased impact energy, while the hierarchical coating shows improved resistance. However, at high impact energies, both coatings experience corrosion degradation.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Shoaib Ahmad, Muddasir Nawaz, Solaiman Mohammad, R. A. Shakoor, Ramazan Kahraman, Talal Mohammed Al Tahtamouni
Summary: This research presents a novel self-healing anti-corrosion composite coating that demonstrates higher inhibition efficiency and self-healing effect, providing protection for metallic structures against corrosive environments.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Hui-Wen Peng, Chun-Hway Hsueh
Summary: A series of (CoCrNi)100-x-ySixNdy medium entropy alloy films with manipulated metalloid element, Si, and rare earth element, Nd, were synthesized using magnetron three-target co-sputtering. The films showed different structures and mechanical properties with varying Si and Nd contents. The optimized mechanical properties were observed in the film with Si0.61Nd5.14, attributed to precipitation strengthening and grain refinement.
SURFACE & COATINGS TECHNOLOGY
(2024)