Article
Materials Science, Multidisciplinary
Rotem Zilberberg, Iryna Polishchuk, Lotan Portal, Silvia Milita, Giuseppe Falini, Alexander Katsman, Boaz Pokroy
Summary: The study introduces a self-driven approach for patterning metal and semiconductor surfaces by solidifying eutectic Au-Si thin films on Si(001) substrates. The study confirms the orientation relationship and lattice mismatch at the Au-Si interface using selected area electron diffraction and synchrotron radiation scattering techniques. The study highlights the potential application of substrate-oriented pattern formation in other systems.
Article
Materials Science, Ceramics
Wei Hao, Na Ni, Tianyu Liu, Lei Zhou, Yao Yao, Ling Li, Juan Jiang, Yinchun Shi, Xiaofeng Zhao, Ping Xiao
Summary: A dense HfC(Si, O)-HfB2(Si, O) composite with enhanced ablation resistance was fabricated via reactive spark plasma sintering, using HfC and SiB6 as starting reactants. The composite with 15% SiB6 addition exhibited the best performance, attributed to a unique double layered oxide formation and stable oxide structure formation due to the solid solution nature and appropriate phase composition of the composite. The negative ablation rates observed during oxyacetylene flame testing indicated slight mass gain/thickness increase, suggesting stable oxidation process and limited mechanical scouring.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
R. Fersi, A. P. Dalia
Summary: This paper presents the study on the crystal structure, morphology, and magnetic properties of nanocrystalline Zr6Fe23 thin films. The Zr6Fe23 films of various thicknesses were grown on Si(001) substrates using RF magnetron sputtering. The results showed a single-phase cubic structure with preferred orientation for films with certain thicknesses, while films with larger thicknesses exhibited a polycrystalline nature with multiple orientations. The magnetic properties were influenced by the thickness and were found to be correlated with the film morphology and intergrain exchange coupling. The study demonstrated the potential applications of nanocrystalline Zr6Fe23 films in magnetic recording and spintronic devices.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Energy & Fuels
Nicolas Barreau, Olivier Durand, Eugene Bertin, Antoine Letoublon, Charles Cornet, Polyxeni Tsoulka, Eric Gautron, Daniel Lincot
Summary: This study investigates the epitaxial growth of Cu(In,Ga)Se2 films (CIGSe) onto GaP/Si(001) pseudosubstrates using co-evaporation, with GaP thin layer epitaxially grown by Molecular Beam Epitaxy (MBE). Extensive structural characterization of epi-CIGSe is performed through X-ray diffraction and transmission electron microscopy, revealing strong evidence of epitaxial growth of CIGSe on (GaP/Si)(001) and the propagation of twins from the GaP/Si interface through the CIGSe/GaP interface. This research aims to pave the way for future CIGSe/GaP/Si structures for tandem solar cells with c-Si bottom cell and GaP interfacial buffer layer, facilitating high-quality CIGSe epitaxial growth as a thin film top cell absorber.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2021)
Article
Nanoscience & Nanotechnology
Chen Jiang, Hao Liu, Zhuoliang Liu, Xiaomin Ren, Bojie Ma, Jun Wang, Jian Li, Shuaicheng Liu, Jiacheng Lin, Kai Liu, Xin Wei, Qi Wang
Summary: The reliability of silicon-based III-V quantum well lasers, particularly those on an on-axis Si (001) substrate, is crucial for the development of Si-based photonic and optoelectronic integrated circuits. Experimental advancements have been made by inserting strained InAlAs layers into the AlGaAs cladding layers to prevent misfit-dislocation formation, resulting in longer lifetime and higher operating temperatures. Further improvements in device reliability will depend on reducing threading-dislocation density in the GaAs/Si virtual substrate.
Article
Engineering, Mechanical
M. Lablali, H. Mes-adi, A. Eddiai, M. Mazroui
Summary: In this study, the growth processes of Cu thin film on stepped Si(001) substrate were investigated using molecular dynamics simulation. The results showed that the morphology of Cu film on different stepped substrates was not smooth, and the surface roughness increased with the augmentation of the step height. Furthermore, the penetration of Cu atoms in the stepped substrate was more important and deeper within the upper terrace compared to the lower terrace. The numerical calculations demonstrated that the step height had no significant effect on the penetration of Cu atoms on the Si(001) stepped substrate.
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2023)
Article
Materials Science, Multidisciplinary
Okan Koeksal, Rossitza Pentcheva
Summary: The topological and thermoelectric properties of (EuO)(n)/(MgO)(m)(001) superlattices are explored using density functional theory calculations. The results show that under specific lattice constants, a sizable band gap is opened due to spin-orbit coupling induced band inversion, leading to the formation of Chern insulators with promising thermoelectric properties.
Article
Materials Science, Multidisciplinary
P. Seredin, D. L. Goloshchapov, I. N. Arsentyev, ShSh Sharofidinov, I. A. Kasatkin, Tatiana Prutskij
Summary: The study focuses on the chloride vapour phase epitaxy growth of GaN film on pre-treated silicon substrates, resulting in the formation of a transition sub-layer and pillar-like GaN grains with low residual stresses and intense photoluminescence. The obtained data serves as important material for understanding the physics of GaN/AlN/Si nano-heterostructures.
Article
Materials Science, Multidisciplinary
Jiale Qu, Chao Ning, Xiang Feng, Bonan Yao, Bo Liu, Ziheng Lu, Tianshuai Wang, Zhi Wei Seh, Siqi Shi, Qianfan Zhang
Summary: SiO-based materials have potential applications as alloys and conversion-type anode materials for lithium-ion batteries, as well as excellent dendrite-proof layers for lithium-metal batteries. Through first-principle calculations, three new thermodynamically stable phases (Li2SiO5, Li4SiO6, and Li4SiO8) were discovered, and it was found that Li2SiO5 and Li4SiO8 phases possess metallic properties with high electronic conductivity. The mechanical strength of Li-Si-O phases was also found to be higher than lithium metal, and the dominant diffusion mechanism in the Li-Si-O ternary systems is interstitial Li hopping.
ENERGY & ENVIRONMENTAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Hassan Amini, Parvin Gholizadeh, Esmaeil Poursaeidi, Jamal Davoodi
Summary: This study investigated the PVD-deposited Ti-TiN multilayer coating on FeCrNi substrate using molecular dynamics simulation, indicating that the diffusion of N adatoms on the Ti surface hinders the epitaxial growth of TiN film. The results revealed better surface morphology and crystallinity for Ti compared to TiN, while changes in factors such as film thickness, substrate temperature, and layer number had varying effects on stress distribution. Additionally, incident energy played a role in influencing the biaxial stress of both substrate and film, as well as the surface roughness of the film.
Article
Materials Science, Ceramics
Mingde Tong, Chunjin Chen, Qiangang Fu, Tao Feng, Wanbo Hou, Jiaping Zhang, Jia Sun, Lei Zhou
Summary: A Hf-Ta-Si-C coating was fabricated by chemical vapor co-deposition to improve the ablation resistance of C/C composites. The ablation resistance, smoothness, and integrity of the coating were improved by introducing Ta. Hf and Ta atoms tend to gather together at high temperature. The precipitation reaction of Hf-Ta-O can accelerate the formation of a smooth and intact oxide layer, playing a positive role in protecting C/C composites.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Lu Lu, Kun Liu, Shao-Bo Mi
Summary: The interfacial properties of the spinel/perovskite heterostructure at the Li0.5Fe2.5O4/(La, Sr)MnO3 interface have been investigated using transmission and scanning transmission electron microscopy techniques. Atomic-scale interface structures of Fe/(La,Sr)O, Fe/MnO2, and (Li,Fe)2O4/MnO2 have been determined for the Li0.5Fe2.5O4 and (La,Sr)MnO3 films with a cube-on-cube orientation relationship. Stacking faults in the Li0.5Fe2.5O4 film, along with interfacial dislocations, contribute to the epitaxial strain relaxation in the heterosystems. These findings contribute to a better understanding of the interfacial structure and physical properties in spinel/perovskite heterostructures.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
D. V. Stryukov, Ya. Yu. Matyash, A. V. Pavlenko
Summary: A series of Ba2NdFeNb4O15 thin films were fabricated on Si(001) substrates with a thickness range of 75 nm to 1 μm using RF-cathode sputtering. The films exhibited a smooth and uniform surface and a polycrystalline structure with c-axis texture. Compared to bulk samples, the films showed a significant increase in lattice parameter c. External field action could induce polarized regions in both thin and thick films, but rapid relaxation of these regions occurred.
Article
Materials Science, Multidisciplinary
Qianglong Fang, Yang Shen, Shuqin Zhang, Xiaodong Yang, Liang Chen, Shangzhong Jin
Summary: Investigated the effect of residual gas molecules on the surface properties of near-infrared low-light image intensifiers, and found that the attachment of gas molecules destroys the stability and electronic properties of the photocathode surface, forming a new dipole. Furthermore, compared the adsorption performances of residual gas molecules on different systems, aiming to reveal their influence on co-sensitized near-infrared low-light image intensifiers.
Article
Physics, Applied
I. Ahmed, S. De Gendt, C. Merckling
Summary: The BaBiO3 perovskite oxide is an interesting material system that exhibits superconductivity when p-doped and predicted topological insulation when n-doped. High-quality single crystalline BaBiO3 films are grown on Si(001) substrates using molecular beam epitaxy, with the growth window established by systematically varying growth parameters.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Biochemistry & Molecular Biology
Beatriz D. Cardoso, Ana Rita O. Rodrigues, Bernardo G. Almeida, Carlos O. Amorim, Vitor S. Amaral, Elisabete M. S. Castanheira, Paulo J. G. Coutinho
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2020)
Article
Nanoscience & Nanotechnology
Vahideh Bayzi Isfahani, Joao Filipe Horta Belo da Silva, Loukya Boddapati, Anabela Gomes Rolo, Rosa Maria Ferreira Baptista, Francis Leonard Deepak, Joao Pedro Esteves de Araujo, Etelvina de Matos Gomes, Bernardo Goncalves Almeida
Summary: This study synthesized highly oriented chromium triiodide (CrI3) magnetic inclusions inside nano/microfibres using the electrospinning technique. The samples exhibited a ferromagnetic-paramagnetic phase transition at 55-56 K and a field-driven metamagnetic transition below 45 K. The anisotropic behavior was attributed to field-induced changes from antiferromagnetic to ferromagnetic alignment along the CrI3 c-axis stacked layers.
Article
Chemistry, Multidisciplinary
Ali Baghizadeh, Pegah Mirzadeh Vaghefi, Xing Huang, Jerome Borme, Bernardo Almeida, Andrei N. Salak, Marc-Georg Willinger, Vitor B. Amaral, Joaquim M. Vieira
Summary: Multiferroic materials with coexistence of magnetic and ferroelectric orders are promising candidates for magnetoelectric devices. Understanding the underlying mechanisms and tailoring the properties to make them suitable for such devices is challenging. Research on epitaxial films of (Lu,Sc)FeO3 shows an increase in the Neel ordering temperature, highlighting the significant impact of lattice strain on thin film properties.
Article
Chemistry, Multidisciplinary
Ricardo J. C. Fernandes, Carlos A. B. Magalhaes, Ana Rita O. Rodrigues, Bernardo G. Almeida, Ana Pires, Andre Miguel Pereira, Joao Pedro Araujo, Elisabete M. S. Castanheira, Paulo J. G. Coutinho
Summary: In this study, zinc/calcium mixed ferrite nanoparticles coupled with photodeposited silver were successfully used for the efficient photodegradation of textile dyes. The composite material exhibited high photocatalytic efficiency and magnetic recovery and reutilization capabilities, as confirmed by experimental results.
Article
Pharmacology & Pharmacy
Beatriz D. Cardoso, Ana Rita O. Rodrigues, Manuel Banobre-Lopez, Bernardo G. Almeida, Carlos O. Amorim, Vitor S. Amaral, Paulo J. G. Coutinho, Elisabete M. S. Castanheira
Summary: The study introduces a novel lipid nanocarrier with superparamagnetic properties for precise drug release through magnetic guidance and control. Optimized manufacturing techniques result in the production of nano-systems with suitable sizes for biomedical applications and high encapsulation efficiency, exhibiting superior drug release kinetics under hyperthermia temperatures and acidic conditions.
Article
Materials Science, Multidisciplinary
A. A. Bassou, P. J. Machado, M. M. Gomes, B. Manjunath, R. Vilarinho, B. Silva, J. Oliveira, B. Almeida, A. Almeida, J. R. Fernandes, L. S. Fernandes, J. Agostinho Moreira, P. B. Tavares
Summary: This study focused on the co-precipitation synthesis, thermal stability, and decomposition process of NdNiO3 phase under 1 bar of oxygen pressure. It was found that using a 1% molar excess of Nd and annealing at around 900 degrees C at 1 bar of O-2 can yield an almost pure NdNiO3-delta phase with a certain oxygen deficiency. Further heating resulted in the decomposition of NdNiO3-delta phase into Nd4Ni3O10 and NiO compounds. Structural parameters and Raman spectra were provided for the compounds studied.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Pharmacology & Pharmacy
Irina S. R. Rio, Ana Rita O. Rodrigues, Juliana M. Rodrigues, Maria-Joao R. P. Queiroz, R. C. Calhelha, Isabel C. F. R. Ferreira, Bernardo G. Almeida, Ana Pires, Andre M. Pereira, Joao P. Araujo, Elisabete M. S. Castanheira, Paulo J. G. Coutinho
Summary: The liposome-like nanostructures containing manganese ferrite nanoparticles covered or decorated with gold were developed for dual cancer therapy combining chemotherapy and photothermia. The magnetic/plasmonic nanoparticles exhibited superparamagnetic behavior and were characterized using various techniques. The core/shell magnetic/plasmonic nanoparticles efficiently inhibited tumor cell growth when irradiated with red light and had high encapsulation efficiencies for potential antitumor drugs.
Article
Chemistry, Physical
Beatriz C. Ribeiro, Cristina A. R. Alvarez, Barbara C. Alves, Juliana M. Rodrigues, Maria Joao R. P. Queiroz, Bernardo G. Almeida, Ana Pires, Andre M. Pereira, Joao P. Araujo, Paulo J. G. Coutinho, Ana Rita O. Rodrigues, Elisabete M. S. Castanheira
Summary: The development of stimuli-sensitive drug delivery systems that can respond to pH and temperature is an attractive area of research in cancer therapy. This study successfully developed magnetic liposomes with pH and temperature sensitivity, and efficiently encapsulated anticancer drugs, demonstrating good drug delivery capabilities.
Article
Biochemistry & Molecular Biology
Fabio A. C. Lopes, Andre V. F. Fernandes, Juliana M. Rodrigues, Maria-Joao R. P. Queiroz, Bernardo G. Almeida, Ana Pires, Andre M. Pereira, Joao P. Araujo, Elisabete M. S. Castanheira, Ana Rita O. Rodrigues, Paulo J. G. Coutinho
Summary: The study involved the preparation of multicore magnetic nanoparticles and magnetoliposomes, showing potential for cancer treatment, especially in combined magnetic hyperthermia and chemotherapy.
Article
Materials Science, Multidisciplinary
B. M. Silva, J. Oliveira, T. Rebelo, V. B. Isfahani, P. Rocha-Rodrigues, N. Lekshmi, J. H. Belo, F. L. Deepak, A. M. L. Lopes, J. P. Araujo, B. G. Almeida
Summary: Multiferroic Ruddlesden-Popper Ca3Mn2O7 thin films were prepared on SrTiO3 substrates by laser ablation. The films exhibited a ferroelectric phase and an orthorhombic phase, with substrate-induced strain enhancing the multiferroicity. The presence of magnetoelectric interactions and magnetically induced enhancement of dipolar correlations were observed.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Chemistry, Physical
Rosa M. F. Baptista, Bruna Silva, Joao Oliveira, Vahideh B. Isfahani, Bernardo Almeida, Mario R. Pereira, Nuno Cerca, Cidalia Castro, Pedro Rodrigues, Ana Machado, Michael Belsley, Etelvina de Matos Gomes
Summary: N,N-dimethyl-4-nitroaniline is an organic superplastic and superelastic crystal with piezoelectric and optical properties. By embedding it into poly-l-lactic acid polymer microfibers, composite fibers with high piezoelectric response and mechanical strength can be fabricated. Additionally, these fibers exhibit solid-state blue fluorescence.
Article
Chemistry, Physical
Vahideh Bayzi Isfahani, Ali Arab, Joao Horta Belo, Joao Pedro Araujo, Maria Manuela Silva, Bernardo Goncalves Almeida
Summary: Prussian Blue (PB) thin films were prepared using different electrodeposition techniques, and the physical/chemical properties of the films were found to vary. The films prepared using symmetric and non-symmetric pulse methods showed better electrochemical stability and lower degradation rates.
Article
Chemistry, Physical
Rosa M. F. Baptista, Goncalo Moreira, Bruna Silva, Joao Oliveira, Bernardo Almeida, Cidalia Castro, Pedro V. Rodrigues, Ana Machado, Michael Belsley, Etelvina de Matos Gomes
Summary: In this work, lead-free organic ferroelectric perovskite nanocrystals were embedded into different polymer fibers using electrospinning technique, creating mechanical energy harvesters. The study found that these organic ferroelectric materials possess the advantages of structural diversity, easy fabrication, and mechanical flexibility, making them ideal for energy harvesting. The embedded nanocrystals exhibited excellent piezoelectric and pyroelectric performance, and the nanofibers remained stable, indicating their potential as flexible energy harvesters.
Article
Chemistry, Physical
Daniela Santos, Rosa M. F. Baptista, Adelino Handa, Bernardo Almeida, Pedro V. Rodrigues, Ana R. Torres, Ana Machado, Michael Belsley, Etelvina de Matos Gomes
Summary: This work presents the fabrication of hybrid systems based on chiral cyclic dipeptide L-Tryptophan-L-Tryptophan incorporated into biopolymer electrospun fibers. The micro/nanofibers contain self-assembled nano-spheres embedded into the polymer matrix, exhibiting wide-band gap semiconductors with a 4.0 eV band gap energy, blue photoluminescence, and significant piezoelectric and pyroelectric properties. These hybrid mats have potential applications in thermal sensing and energy harvesting.
Article
Chemistry, Physical
Daniela Santos, Rosa M. F. Baptista, Adelino Handa, Bernardo Almeida, Pedro V. Rodrigues, Cidalia Castro, Ana Machado, Manuel J. L. F. Rodrigues, Michael Belsley, Etelvina de Matos Gomes
Summary: In this study, a hybrid system comprising biopolymer electrospun fibers incorporated with the chiral cyclo-dipeptide L-Tryptophan-L-Tyrosine was developed. The resulting nanofibers are wide-bandgap semiconductors consisting of self-assembled nanotubes embedded within a polymer matrix, exhibiting intense blue photoluminescence. Moreover, the cyclodipeptide L-Tryptophan-L-Tyrosine incorporated into polycaprolactone nanofibers displays strong second harmonic generation and notable piezoelectric properties. These hybrid systems hold great promise for applications in the field of nanoenergy harvesting and nanophotonics.
Article
Materials Science, Multidisciplinary
Ping Zhang, Xiujie Yue, Yeran Gao, Zhenyong Lin, Shunxiang Wang, Songting Zhang
Summary: This paper investigates the strengthening mechanism of highspeed cutting and solid particle-entrained waterjet peening (HSC-WJP) composite reinforcement on 7075-T6 aluminum alloy. The research results show that composite reinforcement can improve surface quality, reduce surface pits and roughness, and decrease the size of precipitation-free zone (PFZ) at grain boundaries.
Article
Materials Science, Multidisciplinary
Sangyoon Lee, Hwi Yoon, Sanghun Lee, Seung-min Chung, Hyungjun Kim
Summary: The wettability of metal oxides, particularly HfO2 thin films deposited via atomic layer deposition, and its correlation with surface free energy have been studied. It was found that surface oxygen species significantly affect the intrinsic hydrophilicity of HfO2 thin films, and the crystalline orientations also evolve with film thickness.
Article
Materials Science, Multidisciplinary
Changdong Yin, Yiwen Wu, Zhou Xu, Dongdong Ye, Jun Yao, Jianjun Chen, Qiang Liu, Xin Ge, Meiling Ding
Summary: This study proposed a new strategy to indirectly estimate the hydrogen diffusivity of metallic materials under tensile stress by combining the electrochemical hydrogen permeation test (EHPT), the hydrogen diffusion descriptive equation based on Fick's law, and hydrogen pre-charged tensile test. The results showed that the hydrogen permeation curve obtained was highly approximate to the theoretical trend. The hydrogen embrittlement (HE) susceptibility of the specimens increased with increasing stress.
Article
Materials Science, Multidisciplinary
Huan Luo, Wei-yi Wang, Xin Yu, Xian-jun Lei, Lang Liu, Guo-zheng Zha, Wen-long Jiang, Bin Yang, Bao-qiang Xu
Summary: Separating selenium and tellurium is a general challenge in material and non-ferrous metallurgical industries. This paper proposes a novel method that achieved efficient separation of selenium and tellurium using gas-liquid equilibrium phase diagram and valence regulation-vacuum gasification technique.
Article
Materials Science, Multidisciplinary
Fan Zhang, Rong Xin Wang, Aiqin Tian, Fangzhi Li, Jianping Liu, Hui Yang
Summary: Deposition of Pd/Pt/Au three-layer films on p-GaN under high and ultra-high vacuum conditions was studied to investigate the electrical contact properties. Linear I-V curves were observed in samples deposited under ultra-high vacuum conditions, while nonlinear I-V characteristics were obtained in samples deposited under high vacuum conditions. The study also found that the samples deposited under high vacuum conditions had higher amounts of oxygen and Pd oxide. The oxide layer had an additional influence on the electrical characteristics of the Pd/Pt/Au/p-GaN contact.
Article
Materials Science, Multidisciplinary
Hongli Liu, Chengzhe Liu, Ying Sui, Zhongxian Liu, Tiangang Zhang, Zhiqiang Zhang, Shuang Sun, Jianwei Jia
Summary: This study utilized polysiloxane and hafnium carbide to produce Si-N-C-O-Hf hybridized ceramic fibers, and obtained ceramic fibers with hemispherical particles on the surface through electrostatic spinning and pyrolysis. The ceramic fibers exhibited excellent thermal stability, oxidation resistance, and high temperature insulation.
Article
Materials Science, Multidisciplinary
M. Abaker, Nazar Elamin Ahmed, A. Saad, H. F. Khalil, E. M. M. Ibrahim, A. M. Adam
Summary: This paper systematically studied the internal structure and thermoelectric properties of In1-xGaxSb alloys prepared by melting synthesis at 1123 K. The results showed that doping with Ga in the In sites led to a significant increase in the Seebeck coefficient and power factor, while reducing the thermal conductivity. The maximum dimensionless figure of merit was observed at 403 K.
Article
Materials Science, Multidisciplinary
Fucheng Yu, Jinlong Ren, Jielin Zhang, Haiyang Chen, Xin Tian, Chenchen Feng, Cuixia Li, Jianbin Zhang, Xianxi Tang, Xiaogang Hou
Summary: An environmentally friendly ZnO@BiVO4 composite photocatalyst was prepared using in-situ self-assembly and solvothermal methods, demonstrating good photocatalytic performance. The mass ratio of BiVO4 and NCZ was found to influence the photocatalytic performance of the composite.
Article
Materials Science, Multidisciplinary
Yaoming Shao, Pingping Zheng, Tianhao Dong, Lianghuan Wei, Haifei Wu, Jianxiao Si
Summary: In this paper, Mg3Bi2 films were prepared on glass substrate using magnetron sputtering, and the phase composition and thermoelectric properties of the films were investigated with different atomic ratios. The films displayed a metastable cubic phase and high conductivity when the atomic ratio exceeded stoichiometry.
Article
Materials Science, Multidisciplinary
I. V. Uimanov, D. L. Shmelev, S. A. Barengolts
Summary: A two-dimensional axisymmetric model has been developed to study the prebreakdown processes in a cathode microprotrusion under an external electric field. The simulation results show that electrohydrodynamic instability leads to the formation of a nanometer-sized conical protrusion on the microprotrusion tip, significantly accelerating the heating process.
Article
Materials Science, Multidisciplinary
Weilun Zhang, Di Yang, Feng Gong, Yongjun Chen, Tian Chen, Zhiwen Xie, Sirui Yang
Summary: A novel Pt doping method was designed to improve the thermal stability of CrWN coating. The doping of Pt atoms effectively blocks the coherent growth of the grains and creates a significant mixing effect, resulting in a smooth surface with uniform element distribution.
Article
Materials Science, Multidisciplinary
Xiaoye Wang, Xiaoguang Yang, Wenna Du, Tao Yang
Summary: In this study, the effects of multiple growth parameters on self-catalyzed growth of InAs/GaSb axial heterostructured nanowires on Si substrate by MOCVD were investigated. It was found that the growth temperature and switching time have significant influences on the nanowire growth.
Article
Materials Science, Multidisciplinary
Weizhong Cui, Yan Zhao, Can Cui, Xing Liu, Beili Pang, Jianguang Feng, Hongzhou Dong, Liyan Yu, Lifeng Dong
Summary: This study introduces Co2+ cations into Cs2AgBiBr6 film to improve its quality, grain size, and conductivity, resulting in enhanced solar cell efficiency.
Article
Materials Science, Multidisciplinary
Jian Wang, Ke Yang, Xianming Cheng, Yalin Lu, Ganghui Wu, Yang Zhang, Yun Kan
Summary: The corrosion behavior and microstructural evolution of Sc microalloyed Al-3.2Cu-1.5Li alloys were investigated in detail. The microstructural results showed higher levels of dislocations density in the Sc microalloyed sample, which resulted in significantly refined grains and T1 precipitates. Microalloying with Sc changed the corrosion mode of the alloy and localized corrosion was found to occur preferentially at the subgrain within unrecrystallized grains with high grain stored energy.
Article
Materials Science, Multidisciplinary
Weifeng Liu, Na Liu, Kaiqiang Song, Meiqin Zeng, Zhongchen Lu
Summary: Monoclinic WO3 prepared through plasma milling exhibits higher photocatalytic activity due to its higher surface area, increased oxygen vacancies, and defects.
