2D Materials最新文献_第3页

Two-dimensional iron oxide/graphene-based nanocomposites as high-performance solid lubricants 作为高性能固体润滑剂的二维氧化铁/石墨烯基纳米复合材料

IF 5.5 3区材料科学

2D Materials Pub Date : 2024-07-11 DOI: 10.1088/2053-1583/ad5f3f

Pratik S Kasbe, Muxuan Yang, Juan Bosch, Jinyu Bu, Christopher DellaCorte and Weinan Xu

{"title":"Two-dimensional iron oxide/graphene-based nanocomposites as high-performance solid lubricants","authors":"Pratik S Kasbe, Muxuan Yang, Juan Bosch, Jinyu Bu, Christopher DellaCorte and Weinan Xu","doi":"10.1088/2053-1583/ad5f3f","DOIUrl":"https://doi.org/10.1088/2053-1583/ad5f3f","url":null,"abstract":"Beyond conventional 2D layered materials such as graphene and transition metal dichalcogenides, 2D metal oxides have also received much interest in recent years. They have unique electronic (such as 2D TiO2 and MoO2), catalytic (such as 2D CeO2 and MnO2), and magnetic properties (such as 2D Fe2O3) compared with bulk metal oxides due to their atomically thin structures. Certain types of 2D metal oxides also have the potential to be a new type of high-performance solid lubricants due to the tunable interlayer interaction and possibility for 2D heterostructure formation, but this remains largely unexplored. In this work, we developed a scalable microwave-assisted solid-state synthesis of 2D Fe2O3 and their nanocomposites with reduced graphene oxide (rGO). The 2D Fe2O3/rGO nanocomposites were systematically characterized by electron microscopies and spectroscopies, and their utilization as solid lubricants was studied by pin-on-disk tribometer on both silicon and steel substrates. The results show that due to the easy sliding between 2D Fe2O3 and rGO nanosheets and their unique magnetic-induced assembled morphology, low coefficient of friction (COF) can be achieved for both steel-silicon and steel-steel interfaces. Superlubricity (COF ∼ 0.007) can be achieved for the 2D Fe2O3/rGO nanocomposite with a GO primer layer on a steel substrate. This work provides new insights into the development of functional 2D nanocomposites and expands their applications to solid lubrication and beyond.","PeriodicalId":6812,"journal":{"name":"2D Materials","volume":"24 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141611639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Towards revealing intrinsic vortex-core states in Fe-based superconductors through statistical discovery 通过统计发现揭示铁基超导体中的内在涡核状态

IF 5.5 3区材料科学

2D Materials Pub Date : 2024-07-10 DOI: 10.1088/2053-1583/ad5e92

Yueming Guo, Hu Miao, Qiang Zou, Mingming Fu, Athena S Sefat, Andrew R Lupini, Sergei V Kalinin and Zheng Gai

引用次数: 0

Development and optimization of large-scale integration of 2D material in memristors 开发和优化大规模集成二维材料的忆阻器

IF 5.5 3区材料科学

2D Materials Pub Date : 2024-07-04 DOI: 10.1088/2053-1583/ad5bd6

Clotilde Ligaud, Lucie Le Van-Jodin, Bruno Reig, Pierre Trousset, Paul Brunet, Michaël Bertucchi, Clémence Hellion, Nicolas Gauthier, Le Van-Hoan, Hanako Okuno, Djordje Dosenovic, Stéphane Cadot, Remy Gassilloud and Matthieu Jamet

{"title":"Development and optimization of large-scale integration of 2D material in memristors","authors":"Clotilde Ligaud, Lucie Le Van-Jodin, Bruno Reig, Pierre Trousset, Paul Brunet, Michaël Bertucchi, Clémence Hellion, Nicolas Gauthier, Le Van-Hoan, Hanako Okuno, Djordje Dosenovic, Stéphane Cadot, Remy Gassilloud and Matthieu Jamet","doi":"10.1088/2053-1583/ad5bd6","DOIUrl":"https://doi.org/10.1088/2053-1583/ad5bd6","url":null,"abstract":"Two-dimensional (2D) materials like transition metal dichalcogenides (TMD) have proved to be serious candidates to replace silicon in several technologies with enhanced performances. In this respect, the two remaining challenges are the wafer scale growth of TMDs and their integration into operational devices using clean room compatible processes. In this work, two different CMOS-compatible protocols are developed for the fabrication of MoS2-based memristors, and the resulting performances are compared. The quality of MoS2 at each stage of the process is characterized by Raman spectroscopy and x-ray photoemission spectroscopy. In the first protocol, the structure of MoS2 is preserved during transfer and patterning processes. However, a polymer layer with a minimum thickness of 3 nm remains at the surface of MoS2 limiting the electrical switching performances. In the second protocol, the contamination layer is completely removed resulting in improved electrical switching performances and reproducibility. Based on physico-chemical and electrical results, the switching mechanism is discussed in terms of conduction through grain boundaries.","PeriodicalId":6812,"journal":{"name":"2D Materials","volume":"9 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141553260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Versatile fitting approach for operando spectroscopic imaging ellipsometry of HfS2 oxidation 用于 HfS2 氧化操作光谱成像椭偏仪的多功能拟合方法

IF 5.5 3区材料科学

2D Materials Pub Date : 2024-07-01 DOI: 10.1088/2053-1583/ad58f1

Irina Chircă, AbdulAziz AlMutairi, Barat Achinuq, Rongsheng Cai, Sarah J Haigh and Stephan Hofmann

{"title":"Versatile fitting approach for operando spectroscopic imaging ellipsometry of HfS2 oxidation","authors":"Irina Chircă, AbdulAziz AlMutairi, Barat Achinuq, Rongsheng Cai, Sarah J Haigh and Stephan Hofmann","doi":"10.1088/2053-1583/ad58f1","DOIUrl":"https://doi.org/10.1088/2053-1583/ad58f1","url":null,"abstract":"Facile mapping of 2D heterostructures and resolving anisotropic formation kinetics down to the monolayer level are critical to developing scalable interfacing solutions and unlocking their application potential in emerging nano-optoelectronics. We adapt a Kramers–Kronig constrained variational fitting algorithm for spectroscopic imaging ellipsometry (SIE) to facilitate multi-scale heterostructure analysis comprising films with unknown complex dielectric functions and demonstrate how this enables non-destructive, scalable mapping and operando capability for the model system of HfS2 oxidation. This methodology proves highly accurate for assessing the thickness of buried HfS2 layers, oxide quality, and lateral and vertical uniformity. We capture dynamic stack evolution during thermal oxidation up to 400 ∘C, providing insights into the temperature and time-dependent nature of self-limiting oxide growth and reaction kinetics that involve the localised trapping and release of sulphur reaction products. Our methodology is versatile in material and device horizons, and advantageously agnostic to the underlying substrate. Combined with the various modes of SIE operation, it unlocks fast, high-throughput, large-area capability to accelerate process development at the atomic scale.","PeriodicalId":6812,"journal":{"name":"2D Materials","volume":"24 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141501426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Giant asymmetric proximity-induced spin–orbit coupling in twisted graphene/SnTe heterostructure 扭曲石墨烯/硒碲异质结构中巨大的非对称接近性诱导自旋轨道耦合

IF 5.5 3区材料科学

2D Materials Pub Date : 2024-06-27 DOI: 10.1088/2053-1583/ad59b4

Marko Milivojević, Martin Gmitra, Marcin Kurpas, Ivan Štich and Jaroslav Fabian

{"title":"Giant asymmetric proximity-induced spin–orbit coupling in twisted graphene/SnTe heterostructure","authors":"Marko Milivojević, Martin Gmitra, Marcin Kurpas, Ivan Štich and Jaroslav Fabian","doi":"10.1088/2053-1583/ad59b4","DOIUrl":"https://doi.org/10.1088/2053-1583/ad59b4","url":null,"abstract":"We analyze the spin–orbit coupling effects in a 3∘-degree twisted bilayer heterostructure made of graphene and an in-plane ferroelectric SnTe, with the goal of transferring the spin–orbit coupling from SnTe to graphene, via the proximity effect. Our results indicate that the point-symmetry breaking due to the incompatible mutual symmetry of the twisted monolayers and a strong hybridization has a massive impact on the spin splitting in graphene close to the Dirac point, with the spin splitting values greater than 20 meV. The band structure and spin expectation values of graphene close to the Dirac point can be described using a symmetry-free model, triggering different types of interaction with respect to the threefold symmetric graphene/transition-metal dichalcogenide heterostructure. We show that the strong hybridization of the Dirac cone’s right movers with the SnTe band gives rise to a large asymmetric spin splitting in the momentum space. Furthermore, we discover that the ferroelectricity-induced Rashba spin–orbit coupling in graphene is the dominant contribution to the overall Rashba field, with the effective in-plane electric field that is almost aligned with the (in-plane) ferroelectricity direction of the SnTe monolayer. We also predict an anisotropy of the in-plane spin relaxation rates. Our results demonstrate that the group-IV monochalcogenides MX (M = Sn, Ge; X = S, Se, Te) are a viable alternative to transition-metal dichalcogenides for inducing strong spin–orbit coupling in graphene.","PeriodicalId":6812,"journal":{"name":"2D Materials","volume":"3 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141517792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Antiferromagnetism in two-dimensional materials: progress and computational challenges 二维材料中的反铁磁性：进展与计算挑战

IF 5.5 3区材料科学

2D Materials Pub Date : 2024-06-13 DOI: 10.1088/2053-1583/ad4ef1

Thomas Olsen

{"title":"Antiferromagnetism in two-dimensional materials: progress and computational challenges","authors":"Thomas Olsen","doi":"10.1088/2053-1583/ad4ef1","DOIUrl":"https://doi.org/10.1088/2053-1583/ad4ef1","url":null,"abstract":"We present a perspective on the status of antiferromagnetism in two-dimensional (2D) materials. Various types of spin-compensated orders are discussed and include non-collinear order, spin spirals and altermagnetism. Spin–orbit effects ultimately determine, whether compounds exhibit long range order, Kosterlitz-Thouless physics, or multiferroic properties and we discuss the basic magnetic prototypes that may arise in 2D materials depending on the magnetic anisotropy and ordering vector. A summary of 2D antiferromagnets that have been characterized experimentally is provided—with particular emphasis on magnetic anisotropies and Neel temperatures. We then outline the ingredients needed to describe the magnetic properties using density functional theory. In particular, the systematic determination of magnetic ground states from the generalized Bloch theorem and the magnetic force theorem, which may be used to calculate magnetic excitations from the Heisenberg model with parameters determined from first principles. The methods are exemplified by application to the monolayer helimagnet NiBr2. Finally, we present a summary of predicted and prospective 2D antiferromagnets and discuss the challenges associated with the prediction of Néel temperatures from first principles.","PeriodicalId":6812,"journal":{"name":"2D Materials","volume":"78 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141501394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Temperature-dependent indirect gaps for two-dimensional bismuth oxychalcogenides probed by spectroscopic ellipsometry 通过光谱椭偏仪探测二维氧粲铋化合物随温度变化的间接间隙

IF 5.5 3区材料科学

2D Materials Pub Date : 2024-06-12 DOI: 10.1088/2053-1583/ad50ad

Hsiang-Lin Liu, Hsiao-Wen Chen, Nguyen Tuan Hung, Yi-Cheng Chen, Heng-Jui Liu, Chieh-Ting Chen, Yu-Lun Chueh, Ying-Hao Chu and Riichiro Saito

引用次数: 0

Photoexcited charge carrier dynamics and electronic properties of two-dimensional MXene, Nb2CT x 二维 MXene、Nb2CT x 的光激发电荷载流子动力学和电子特性

IF 5.5 3区材料科学

2D Materials Pub Date : 2024-06-11 DOI: 10.1088/2053-1583/ad518d

Andrew M Fitzgerald, Emily Sutherland, Tarek Ali El-Melegy, Mary Qin Hassig, Julia L Martin, Erika Colin-Ulloa, Ken Ngo, Ronald L Grimm, Joshua R Uzarski, Michel W Barsoum, N Aaron Deskins, Lyubov V Titova and Kateryna Kushnir Friedman

{"title":"Photoexcited charge carrier dynamics and electronic properties of two-dimensional MXene, Nb2CT x","authors":"Andrew M Fitzgerald, Emily Sutherland, Tarek Ali El-Melegy, Mary Qin Hassig, Julia L Martin, Erika Colin-Ulloa, Ken Ngo, Ronald L Grimm, Joshua R Uzarski, Michel W Barsoum, N Aaron Deskins, Lyubov V Titova and Kateryna Kushnir Friedman","doi":"10.1088/2053-1583/ad518d","DOIUrl":"https://doi.org/10.1088/2053-1583/ad518d","url":null,"abstract":"Two-dimensional, 2D, niobium carbide MXene, Nb2CTx, has attracted attention due to its extraordinarily high photothermal conversion efficiency that has applications ranging from medicine, for tumor ablation, to solar energy conversion. Here, we characterize its electronic properties and investigate the ultrafast dynamics of its photoexcitations with a goal of shedding light onto the origins of its unique properties. Through density functional theory, DFT, calculations, we find that Nb2CTx is metallic, with a small but finite DOS at the Fermi level for all experimentally relevant terminations that can be achieved using HF or molten salt etching of the parent MAX phase, including –OH, –O, –F, –Cl, –Br, –I. In agreement with this prediction, THz spectroscopy reveals an intrinsic long-range conductivity of ∼60 Ω−1 cm−1, with significant charge carrier localization and a charge carrier density (∼1020 cm−3) comparable to Mo-based MXenes. Excitation with 800 nm pulses results in a rapid enhancement in photoconductivity, which decays to less than 25% of its peak value within several picoseconds, underlying efficient photothermal conversion. At the same time, a small fraction of photoinjected excess carriers persists for hundreds of picoseconds, and can potentially be utilized in photocatalysis or other energy conversion applications.","PeriodicalId":6812,"journal":{"name":"2D Materials","volume":"57 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141501225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Interplay of altermagnetism and weak ferromagnetism in two-dimensional RuF4 二维 RuF4 中的变磁性和弱铁磁性的相互作用

IF 5.5 3区材料科学

2D Materials Pub Date : 2024-05-29 DOI: 10.1088/2053-1583/ad4c73

Marko Milivojević, Marko Orozović, Silvia Picozzi, Martin Gmitra and Srđan Stavrić

引用次数: 0

Role of chalcogen vacancies and hydrogen in the optical and electrical properties of bulk transition-metal dichalcogenides 铬空位和氢在块状过渡金属二卤化物的光学和电学特性中的作用

IF 5.5 3区材料科学

2D Materials Pub Date : 2024-05-23 DOI: 10.1088/2053-1583/ad4720

Shoaib Khalid, Anderson Janotti and Bharat Medasani

引用次数: 0