Superlattices and Microstructures最新文献_第4页

Triethanolamine assisted synthesis of bimetallic nickel cobalt nitride/nitrogen-doped carbon hollow nanoflowers for supercapacitor 三乙醇胺辅助合成双金属氮化镍钴/氮掺杂碳空心纳米花

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2023-01-01 DOI: 10.20517/microstructures.2022.41

引用次数: 1

180° head-to-head flat domain walls in single crystal BiFeO3 单晶BiFeO3中180°头对头平面畴壁

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2023-01-01 DOI: 10.20517/microstructures.2023.13

Wanbing Ge, R. Beanland, M. Alexe, Q. Ramasse, A. Sanchez

引用次数: 2

Crystallographic variant mapping using precession electron diffraction data 利用进动电子衍射数据的晶体变分图

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2023-01-01 DOI: 10.20517/microstructures.2023.17

Marcus H. Hansen

{"title":"Crystallographic variant mapping using precession electron diffraction data","authors":"Marcus H. Hansen","doi":"10.20517/microstructures.2023.17","DOIUrl":"https://doi.org/10.20517/microstructures.2023.17","url":null,"abstract":"In this work, we developed three methods to map crystallographic variants of samples at the nanoscale by analyzing precession electron diffraction data using a high-temperature shape memory alloy and a VO2 thin film on sapphire as the model systems. The three methods are (I) a user-selecting-reference pattern approach, (II) an algorithm-selecting-reference-pattern approach, and (III) a k-means approach. In the first two approaches, Euclidean distance, Cosine, and Structural Similarity (SSIM) algorithms were assessed for the diffraction pattern similarity quantification. We demonstrated that the Euclidean distance and SSIM methods outperform the Cosine algorithm. We further revealed that the random noise in the diffraction data can dramatically affect similarity quantification. Denoising processes could improve the crystallographic mapping quality. With the three methods mentioned above, we were able to map the crystallographic variants in different materials systems, thus enabling fast variant number quantification and clear variant distribution visualization. The advantages and disadvantages of each approach are also discussed. We expect these methods to benefit researchers who work on martensitic materials, in which the variant information is critical to understand their properties and functionalities.","PeriodicalId":22044,"journal":{"name":"Superlattices and Microstructures","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78740661","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

Emerging microporous materials as novel templates for quantum dots 新兴微孔材料作为量子点的新模板

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2023-01-01 DOI: 10.20517/microstructures.2023.08

Jaeho Lee, Lianzhou Wang, Jingwei Hou

{"title":"Emerging microporous materials as novel templates for quantum dots","authors":"Jaeho Lee, Lianzhou Wang, Jingwei Hou","doi":"10.20517/microstructures.2023.08","DOIUrl":"https://doi.org/10.20517/microstructures.2023.08","url":null,"abstract":"Microporous structures have attracted significant attention in recent years. In particular, metal-organic frameworks (MOFs) and covalent organic frameworks (COFs) have received considerable attention due to their tailorable structures that offer a wide range of choices in terms of molecular building blocks. Due to their high tunability, these materials are considered as ideal host matrices for templating and encapsulating guest materials, particularly quantum dots (QDs). QDs are investigated heavily for various applications such as light-emitting diodes (LED), biosensors, catalysts, and solar cells due to their unique properties from the quantum confinement effect. However, one of the drawbacks of QDs is their tendency to aggregate and exhibit low stability due to their small size and kinetic trapping in nanoparticle form. This perspective highlights promising approaches to enhance the performance and stability of QDs by using microporous materials as an encapsulation layer. Additionally, potential mitigating strategies are discussed to overcome current challenges and improve the practicality of QDs embedded in microporous nanocomposites.","PeriodicalId":22044,"journal":{"name":"Superlattices and Microstructures","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89984541","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

Structure, magnetism and low thermal expansion in Tb1-xErxCo2Mny intermetallic compounds t_1 - xerxco2mine金属间化合物的结构、磁性和低热膨胀

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2023-01-01 DOI: 10.20517/microstructures.2023.03

Yanming Sun, Yili Cao, Y. Ren, S. Lapidus, Qiang Li, J. Deng, Jun Miao, K. Lin, X. Xing

引用次数: 0

Microstructural constructing 2D tin allotropes on Al(111): from quasi-periodic lattice to square-like lattice Al(111)上二维锡同素异形体的微观结构:从拟周期晶格到方形晶格

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2023-01-01 DOI: 10.20517/microstructures.2023.01

引用次数: 0

Strong metal-support interaction of Pt-based electrocatalysts with transition metal oxides/nitrides/carbides for oxygen reduction reaction pt基电催化剂与过渡金属氧化物/氮化物/碳化物在氧还原反应中的强金属支撑相互作用

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2023-01-01 DOI: 10.20517/microstructures.2023.12

Min Chen

{"title":"Strong metal-support interaction of Pt-based electrocatalysts with transition metal oxides/nitrides/carbides for oxygen reduction reaction","authors":"Min Chen","doi":"10.20517/microstructures.2023.12","DOIUrl":"https://doi.org/10.20517/microstructures.2023.12","url":null,"abstract":"The practical application of carbon-supported Pt-based catalysts for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs) still faces many limitations, including carbon corrosion and their weak interaction with Pt-based nanoparticles (NPs). Harnessing the strong metal-support interaction (SMSI) effects at the interface between Pt-based nanoparticles and alternative corrosion-resistant non-carbon support is an effective strategy to address these issues. The rational design of Pt-based catalysts with favorable SMSI and elucidation of the mechanisms underlying such interactions is indispensable for achieving desirable activity and stability. In this review, first, the basic principles of the ORR are briefly introduced. Next, the formation process of SMSI, construction strategies, and the advantages and drawbacks of representative supports, including transition metal oxides, nitrides, and carbides (TMOs, TMCs, and TMNs, respectively), are fully discussed. Finally, the challenges and prospects in promoting the practical applications of the SMSI effect for ORR are highlighted.","PeriodicalId":22044,"journal":{"name":"Superlattices and Microstructures","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80514872","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: 1

Grain engineering of high energy density BaTiO3 thick films integrated on Si Si上高能量密度BaTiO3厚膜的颗粒工程

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2023-01-01 DOI: 10.20517/microstructures.2023.22

J. Ouyang, Xiaoman Teng, Meiling Yuan, Kun Wang, Yuyao Zhao, Hongbo Cheng, Hanfei Zhu, Chao-Te Liu, Yongguang Xiao, M. Tang, Wei Zhang, W. Pan

{"title":"Grain engineering of high energy density BaTiO3 thick films integrated on Si","authors":"J. Ouyang, Xiaoman Teng, Meiling Yuan, Kun Wang, Yuyao Zhao, Hongbo Cheng, Hanfei Zhu, Chao-Te Liu, Yongguang Xiao, M. Tang, Wei Zhang, W. Pan","doi":"10.20517/microstructures.2023.22","DOIUrl":"https://doi.org/10.20517/microstructures.2023.22","url":null,"abstract":"Ferroelectric (FE) ceramics with a large relative dielectric permittivity and a high dielectric strength have the potential to store or supply electricity of very high energy and power densities, which is desirable in many modern electronic and electrical systems. For a given FE material, such as the commonly-used BaTiO3, a close interplay between defect chemistry, misfit strain, and grain characteristics must be carefully manipulated for engineering its film capacitors. In this work, the effects of grain orientation and morphology on the energy storage properties of BaTiO3 thick films were systematically investigated. These films were all deposited on Si at 500 °C in an oxygen-rich atmosphere, and their thicknesses varied between ~500 nm and ~2.6 μm. While a columnar nanograined BaTiO3 film with a (001) texture showed a higher recyclable energy density Wrec (81.0 J/cm3vs. 57.1 J/cm3 @3.2 MV/cm, ~40% increase) than that of a randomly-oriented BaTiO3 film of about the same thickness (~500 nm), the latter showed an improved energy density at a reduced electric field with an increasing film thickness. Specifically, for the 1.3 μm and 2.6 μm thick polycrystalline films, their energy storage densities Wrec reached 46.6 J/cm3 and 48.8 J/cm3 at an applied electric field of 2.31 MV/cm (300 V on 1.3 μm film) and 1.77 MV/cm (460 V on 2.6 μm film), respectively. This ramp-up in energy density can be attributed to increased polarizability with a growing grain size in thicker polycrystalline films and is desirable in high pulse power applications.","PeriodicalId":22044,"journal":{"name":"Superlattices and Microstructures","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90272232","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

What lies beneath? Investigations of atomic force microscopy-based nano-machining to reveal sub-surface ferroelectric domain configurations in ultrathin films 下面是什么?基于原子力显微镜的纳米加工研究揭示超薄膜的亚表面铁电畴结构

3区物理与天体物理

Superlattices and Microstructures Pub Date : 2023-01-01 DOI: 10.20517/microstructures.2023.41

Lynette Keeney, Louise Colfer, Debismita Dutta, Michael Schmidt, Guannan Wei

{"title":"What lies beneath? Investigations of atomic force microscopy-based nano-machining to reveal sub-surface ferroelectric domain configurations in ultrathin films","authors":"Lynette Keeney, Louise Colfer, Debismita Dutta, Michael Schmidt, Guannan Wei","doi":"10.20517/microstructures.2023.41","DOIUrl":"https://doi.org/10.20517/microstructures.2023.41","url":null,"abstract":"Multiferroic materials, encompassing simultaneous ferroelectric and ferromagnetic polarization states, are enticing multi-state materials for memory scaling beyond existing technologies. Aurivillius phase B6TFMO (Bi6TixFeyMnzO18) is a unique room temperature multiferroic material that could ideally be suited to future production of revolutionary memory devices. As miniaturization of electronic devices continues, it is crucial to characterize ferroelectric domain configurations at very small (sub-10 nm) thickness. Direct liquid injection chemical vapor deposition allows for frontier development of ultrathin films at fundamental (close to unit cell) dimensions. However, layer-by-layer growth of ultrathin complex oxides is subject to the formation of surface contaminants and 2D islands and pits, which can obscure visualization of domain patterns using piezoresponse force microscopy (PFM). Herein, we apply force from a sufficiently stiff diamond cantilever while scanning over ultrathin films to perform atomic force microscopy (AFM)-based nano-machining of the surface layers. Subsequent lateral PFM imaging of sub-surface layers uncovers 45° orientated striped twin domains, entirely distinct from the randomly configured piezoresponse observed for the pristine film surface. Furthermore, our investigations indicate that these sub-surface domain structures persist along the in-plane directions throughout the film depth down to thicknesses of less than half of an Aurivillius phase unit cell (˂ 2.5 nm). Thus, AFM-based nano-machining in conjunction with PFM allows demonstration of stable in-plane ferroelectric domains at thicknesses lower than previously determined for multiferroic B6TFMO. These findings demonstrate the technological potential of Aurivillius phase B6TFMO for future miniaturized memory storage devices. Next-generation devices based on ultrathin multiferroic tunnel junctions are projected.","PeriodicalId":22044,"journal":{"name":"Superlattices and Microstructures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136367561","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

First-principles calculations to investigate electronic structure and optical properties of 2D MgCl2 monolayer 用第一性原理计算研究二维MgCl2单层的电子结构和光学性质

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2022-02-01 DOI: 10.1016/j.spmi.2021.107132

H.R. Mahida , Abhishek Patel , Deobrat Singh , Yogesh Sonvane , P.B. Thakor , Rajeev Ahuja

{"title":"First-principles calculations to investigate electronic structure and optical properties of 2D MgCl2 monolayer","authors":"H.R. Mahida , Abhishek Patel , Deobrat Singh , Yogesh Sonvane , P.B. Thakor , Rajeev Ahuja","doi":"10.1016/j.spmi.2021.107132","DOIUrl":"10.1016/j.spmi.2021.107132","url":null,"abstract":"<div>In the present work, we have concentrated on the structural, electronic, and optical properties of single-layer phase MgCl2. When bulk MgCl2 reduces to monolayer form, then it exhibited indirect to direct bandgap transformation. The result indicates that the monolayer MgCl2 exhibits insulating characteristics with a direct bandgap of 7.377 eV whereas its bulk form has an indirect bandgap of 7.02 eV. It means that when reducing the dimensionally of the MgCl2 materials than its bandgap significantly increased. The optical properties of the monolayer MgCl2 have been investigated using DFT within the random phase approximation. The calculated refractive index values are very near to water, which means that monolayer MgCl2 material will be a transparent material. Also, the optical absorption coefficient is found to be very high in the ultraviolet (UV) region. From optical properties, the out-of-plane (E⊥Z) direction of polarizations is shifted towards the higher photon energy as compared to the in-plane (E||X) direction. From the optical properties profile, the polarizations along in-plane and out-of-plane are different therefore it shows anisotropic behavior. These investigated results show the monolayer MgCl2 could be a promising material for optoelectronic nanodevices such as deep UV emitters and detectors, electrical insulators, atomically thin coating materials.</div>","PeriodicalId":22044,"journal":{"name":"Superlattices and Microstructures","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0749603621003335/pdfft?md5=ebed078e2f63e256054f92c98b77c4a0&pid=1-s2.0-S0749603621003335-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47711375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7