Superlattices and Microstructures最新文献_第8页

An ultraviolet-visible distinguishable broadband photodetector based on the positive and negative photoconductance effects of a graphene/ZnO quantum dot heterostructure 基于石墨烯/ZnO量子点异质结构正负光导效应的紫外-可见光可分辨宽带光电探测器

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2022-01-01 DOI: 10.20517/microstructures.2022.24

引用次数: 2

Effects of processing parameters on a β-solidifying TiAl alloy fabricated by laser-based additive manufacturing 工艺参数对激光增材制造β-凝固TiAl合金的影响

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2022-01-01 DOI: 10.20517/microstructures.2022.17

Danni Huang, Yangping Dong, Han-De Chen, Yinghao Zhou, M. Zhang, Ming Yan

{"title":"Effects of processing parameters on a β-solidifying TiAl alloy fabricated by laser-based additive manufacturing","authors":"Danni Huang, Yangping Dong, Han-De Chen, Yinghao Zhou, M. Zhang, Ming Yan","doi":"10.20517/microstructures.2022.17","DOIUrl":"https://doi.org/10.20517/microstructures.2022.17","url":null,"abstract":"β-solidifying TiAl alloys are considered as promising candidate materials for high-temperature structural applications. Laser-based additive manufacturing (LAM) enables the fabrication of components with geometrical complexity in near-net shape, leading to time and feedstock savings. In this study, a gas-atomized Ti-44Al-4Nb-1Mo-1Cr powder is used as a feedstock material for LAM. However, the LAM of TiAl alloys remains a challenge due to serious cracking during the printing process. To minimize the cracking, the optimization of the LAM processing parameters is essential. Hence, the effects of the LAM processing parameters on the cracking susceptibility and microstructure are studied here. Our experimental results show that the cracking susceptibility can be mitigated by increasing the laser power. Accordingly, the microstructure transforms from the dominating α2 grains to a near-lamellar microstructure with an increment in laser power, leading to a reduction in microhardness, even though it is still higher than that of its as-cast counterparts. It is concluded that changes in the laser power can directly tailor the microstructure, phase composition and microhardness of LAM-fabricated TiAl alloys.","PeriodicalId":22044,"journal":{"name":"Superlattices and Microstructures","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81886034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Metal-organic framework-tailored perovskite solar cells 金属有机框架定制钙钛矿太阳能电池

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2022-01-01 DOI: 10.20517/microstructures.2022.05

Peng Chen, Jingwei Hou, Lianzhou Wang

引用次数: 4

Applications of in situ electron microscopy in oxygen electrocatalysis 原位电子显微镜在氧电催化中的应用

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2022-01-01 DOI: 10.20517/microstructures.2021.12

Zhi‐Peng Wu, Hui Zhang, Cailing Chen, Guanxing Li, Yu Han

{"title":"Applications of in situ electron microscopy in oxygen electrocatalysis","authors":"Zhi‐Peng Wu, Hui Zhang, Cailing Chen, Guanxing Li, Yu Han","doi":"10.20517/microstructures.2021.12","DOIUrl":"https://doi.org/10.20517/microstructures.2021.12","url":null,"abstract":"Oxygen electrocatalysis involving the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) plays a vital role in cutting-edge energy conversion and storage technologies. In situ studies of the evolution of catalysts during oxygen electrocatalysis can provide important insights into their structure - activity relationships and stabilities under working conditions. Among the various in situ characterization tools available, in situ electron microscopy has the unique ability to perform structural and compositional analyzes with high spatial resolution. In this review, we present the latest developments in in situ and quasi-in situ electron microscopic techniques, including identical location electron microscopy, in situ liquid cell (scanning) transmission electron microscopy and in situ environmental transmission electron microscopy, and elaborate their applications in the ORR and OER. Our discussion centers on the degradation mechanism, structural evolution and structure - performance correlations of electrocatalysts. Finally, we summarize the earlier discussions and share our perspectives on the current challenges and future research directions of using in situ electron microscopy to explore oxygen electrocatalysis and related processes.","PeriodicalId":22044,"journal":{"name":"Superlattices and Microstructures","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73216792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Design and manufacture of high-performance microbatteries: lithium and beyond 高性能微电池的设计和制造:锂及其他

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2022-01-01 DOI: 10.20517/microstructures.2022.10

Feiyang Chen, Zheng-Long Xu

{"title":"Design and manufacture of high-performance microbatteries: lithium and beyond","authors":"Feiyang Chen, Zheng-Long Xu","doi":"10.20517/microstructures.2022.10","DOIUrl":"https://doi.org/10.20517/microstructures.2022.10","url":null,"abstract":"The accelerated development of miniaturized and customized electronics has stimulated the demand for high-energy microbatteries (MBs) as on-chip power sources for autonomous state operations. However, commercial MBs with thin-film configurations exhibit insufficient energy and power density due to their limited active materials and sluggish ion diffusion kinetics. In order to simultaneously enhance electrochemical performance and maintain low-cost production, efforts have been devoted to constructing three-dimensional battery architectures. This review summarizes the state-of-the-art progress in designing and fabricating microelectrodes for microbattery assembly, including the top-down etching and bottom-up printing techniques, with a particular focus on elucidating the correlations between electrode structures, battery performance, and cost-effectiveness. More importantly, advancements in post-lithium batteries based on sodium, zinc and aluminum are also surveyed to offer alternative options with potentially higher energy densities and/or lower battery manufacturing costs. The applications of advanced MBs in on-chip microsystems and wearable electronics are also highlighted. Finally, conclusions and perspectives for the future development of MBs are proposed.","PeriodicalId":22044,"journal":{"name":"Superlattices and Microstructures","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86054134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Polarization boosted catalysis: progress and outlook 极化助推催化:进展与展望

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2022-01-01 DOI: 10.20517/microstructures.2021.14

Lin Ju, Xiao Tang, Liangzhi Kou

引用次数: 7

Low neutron cross-section FeCrVTiNi based high-entropy alloys: design, additive manufacturing and characterization 低中子截面FeCrVTiNi基高熵合金:设计、增材制造和表征

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2022-01-01 DOI: 10.20517/microstructures.2021.09

B. Dong, Zhiyang Wang, Hanliang Zhu, O. Muránsky, Zhijun Qiu, Chen Shen, Z. Pan, Huijun Li

{"title":"Low neutron cross-section FeCrVTiNi based high-entropy alloys: design, additive manufacturing and characterization","authors":"B. Dong, Zhiyang Wang, Hanliang Zhu, O. Muránsky, Zhijun Qiu, Chen Shen, Z. Pan, Huijun Li","doi":"10.20517/microstructures.2021.09","DOIUrl":"https://doi.org/10.20517/microstructures.2021.09","url":null,"abstract":"The development of high-entropy alloys (HEAs) based on the novel alloying concept of multi-principal components presents opportunities for achieving new materials with desired properties for increasingly demanding applications. In this study, a low neutron cross-section FeCrVTiNi-based HEA was developed for potential nuclear applications. A face-centred cubic (FCC) HEA with the nominal composition of FeCr0.4V0.3Ti0.2Ni1.3 is proposed based on the empirical thermodynamic models and the CALculation of PHAse diagrams (CALPHAD) calculation. Verifications of the predictions were performed, including the additive manufacturing of the proposal material and a range of microstructural characterizations and mechanical property tests. Consistent with the prediction, the as-fabricated HEA consists of a dominant FCC phase and minor Ni3Ti precipitates. Moreover, significant chemical segregation in the alloy, as predicted by the CALPHAD modelling, was observed experimentally in the produced dendritic microstructure showing the enrichment of Ni and Ti elements in the interdendritic regions and the segregation of Cr and V elements in the dendritic cores. Heterogenous mechanical properties, including microhardness and tensile strengths, were observed along the building direction of the additively manufactured HEA. The various solid solution strengthening effects, due to the chemical segregation (in particular Cr and V elements) during solidification, are identified as significant contributing factors to the observed mechanical heterogeneity. Our study provides useful knowledge for the design and additive manufacturing of compositionally complex HEAs and their composition-microstructure-mechanical property correlation.","PeriodicalId":22044,"journal":{"name":"Superlattices and Microstructures","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74284441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Modeling of Schottky diode characteristic by machine learning techniques based on experimental data with wide temperature range 基于宽温度范围实验数据的肖特基二极管特性机器学习建模

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2021-12-01 DOI: 10.1016/j.spmi.2021.107062

Yunis Torun , Hülya Doğan

{"title":"Modeling of Schottky diode characteristic by machine learning techniques based on experimental data with wide temperature range","authors":"Yunis Torun , Hülya Doğan","doi":"10.1016/j.spmi.2021.107062","DOIUrl":"10.1016/j.spmi.2021.107062","url":null,"abstract":"<div><p><span>In this study, 4 common machine learning methods have been used to model the I–V characteristic of the Au/Ni/n-GaN/undoped GaN Schottky diode. The current values of previously produced Au/Ni/n-GaN/undoped GaN Schottky diode against the voltages applied to the diode terminal starting from the temperature of 40K up to 400K with 20K steps were measured. Models were created using Adaptive Neuro Fuzzy System, </span>Artificial Neural Network, Support Vector Regression, and Gaussian Process Regression techniques using experimental data containing 5192 samples in total. After determining the combinations and specifications for each one that provide the lowest model error of each model, the performances of the obtained models were compared with each other concerning the various performance indices. The performance of the ANFIS model was found to be much better than the others in both the learning and test phases with RMSE model errors as 6.231e-06 and 6.806e-06, respectively. Therefore, it was proposed as a powerful tool for modeling I–V characteristics at all temperature values between 40K and 400K.</p></div>","PeriodicalId":22044,"journal":{"name":"Superlattices and Microstructures","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45120691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Properties of optical bipolaron in symmetric quantum dot 对称量子点中光学双极化子的性质

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2021-12-01 DOI: 10.1016/j.spmi.2021.107082

J.-R.D. Djomou, A.J. Fotue, S.C. Kenfack, L.C. Fai

{"title":"Properties of optical bipolaron in symmetric quantum dot","authors":"J.-R.D. Djomou, A.J. Fotue, S.C. Kenfack, L.C. Fai","doi":"10.1016/j.spmi.2021.107082","DOIUrl":"10.1016/j.spmi.2021.107082","url":null,"abstract":"<div><p>Optical bipolaron properties in the symmetric quantum dot<span><span> were investigated using the Lee-Low-Pines-Huybrechts method and the Tokuda linear combination operator method. Algebraic expressions are derived for the energies of the fundamental and first excited states, the effective mass, mobility, binding energy and oscillation period of the optical bipolaron. Results prove that the energies of fundamental and first excited states increase with the coupling constant. Another point is that the strong coupling method dominates the weak coupling and the intermediate one when the electron-phonon coupling enhances. We also observe that the binding energy becomes always positive when confinement strength is above 5. In other points, the binding energy of optical bipolaron is well studied in all coupling, especially in weak coupling. It is also noticed that energies are increasing the function of the </span>dielectric ratio and the oscillation period is reducing with the dielectric ratio. This proves that the electron-electron interaction is strengthened in a quantum dot. The stronger the coupling, the higher mobility in the case of low temperature.</span></p></div>","PeriodicalId":22044,"journal":{"name":"Superlattices and Microstructures","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49479594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pulse electrodeposited zinc sulfide as an eco-friendly buffer layer for the cadmium-free thin-film solar cells 脉冲电沉积硫化锌作为无镉薄膜太阳能电池的环保缓冲层

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2021-12-01 DOI: 10.1016/j.spmi.2021.107060

Divya Boosagulla , Sreekanth Mandati , Prashant Misra , Ramachandraiah Allikayala , Bulusu V. Sarada

{"title":"Pulse electrodeposited zinc sulfide as an eco-friendly buffer layer for the cadmium-free thin-film solar cells","authors":"Divya Boosagulla , Sreekanth Mandati , Prashant Misra , Ramachandraiah Allikayala , Bulusu V. Sarada","doi":"10.1016/j.spmi.2021.107060","DOIUrl":"10.1016/j.spmi.2021.107060","url":null,"abstract":"<div><p>Zinc sulfide<span><span><span> (ZnS) is an emerging alternate n-type buffer layer for the cadmium-free thin-film solar cells. The present research adopts a unique mixture of glycerol and tartaric acid for the emergence of phase-pure ZnS during pulse </span>electrodeposition<span><span>. Besides, proper optimization of pulse parameters aid in producing crystalline ZnS films with no post-deposition heat treatment. The as-deposited films exhibit cubic ZnS as confirmed from X-Ray Diffraction (XRD) and micro-Raman analyses. The optical study reveals an average transmittance of 71% in the wavelength spread of 300–900 nm with a band gap of 3.8 eV. The n-type semiconducting behavior of ZnS is affirmed from the Mott-Schottky analysis and the flat band potential is inferred to be −1.0 V vs SCE. The crystalline ZnS films produced from the economic pulse electrodeposition method devoid of heat treatment step, with their demonstration as </span>photoanode in </span></span>photoelectrochemical cells are suitable for the relevant applications.</span></p></div>","PeriodicalId":22044,"journal":{"name":"Superlattices and Microstructures","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44533966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6