2D Materials最新文献_第10页

Enhancement of electron magnetic susceptibility due to many-body interactions in monolayer MoSe2 单层MoSe2中多体相互作用增强电子磁化率

IF 5.5 3区材料科学

2D Materials Pub Date : 2023-05-02 DOI: 10.1088/2053-1583/acefe3

K. Oreszczuk, A. Rodek, M. Goryca, T. Kazimierczuk, M. Raczynski, J. Howarth, T. Taniguchi, K. Watanabe, M. Potemski, P. Kossacki

引用次数: 0

Nano metal oxide-intercalated MXene in-situ prepared by irradiation as effective electromagnetic wave absorbents 辐照原位制备纳米金属氧化物插层MXene作为有效的电磁波吸收剂

IF 5.5 3区材料科学

2D Materials Pub Date : 2023-05-02 DOI: 10.1088/2053-1583/acd19e

Yu Chen, Feiyue Hu, Xianghao Cui, Peigen Zhang, Hai-qian Zhang, Shuquan Chang, Xiaodan Hu, Xiaohong Zhang

{"title":"Nano metal oxide-intercalated MXene in-situ prepared by irradiation as effective electromagnetic wave absorbents","authors":"Yu Chen, Feiyue Hu, Xianghao Cui, Peigen Zhang, Hai-qian Zhang, Shuquan Chang, Xiaodan Hu, Xiaohong Zhang","doi":"10.1088/2053-1583/acd19e","DOIUrl":"https://doi.org/10.1088/2053-1583/acd19e","url":null,"abstract":"With the rapid development of electronic communication technology, electromagnetic pollution has become increasingly severe, leading to a growing need for absorption materials with excellent absorption performance. Herein, nano-sized oxide-intercalated Ti3C2T x MXene composites were synthesized via γ-radiation in an aqueous system. The synthesis was conducted in a reducing environment at room temperature, which effectively prevented the oxidation of MXene. Nano-oxides (Fe2O3 and Cu2O) were formed in situ between the MXene layers, forming a homogeneous oxide-intercalated structure. Compared with the original MXene, the intercalated structure significantly enhanced the electromagnetic wave absorption (EMA) performance of the MXene/Fe2O3 composite in the frequency range of 2–18 GHz, with smaller reflection loss (RL) (−58.7 dB), thinner thickness (2.35 mm). The RLmin value of the MXene/Cu2O composite was −50.9 dB (2.55 mm) and the effective frequency width was 4.88 GHz at a thickness of 1.3 mm. Compared with ordinary chemical methods, the γ-radiation is a facile and ‘green’ method that is suitable for large-scale preparation. The absorption mechanism was attributed to conductive loss, polarization loss, and magnetic loss, which contributed to efficient EMA. This work demonstrates that γ-radiation is a promising method for preparing nano metal oxide-intercalated MXene with enhanced EMA performance.","PeriodicalId":6812,"journal":{"name":"2D Materials","volume":" ","pages":""},"PeriodicalIF":5.5,"publicationDate":"2023-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47858716","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

Understanding the chemistry of 2D rhodium trihalide solid solutions: tuning of optical properties and nanocrystal deposition 理解2D三卤化铑固溶体的化学：光学性质的调整和纳米晶体的沉积

IF 5.5 3区材料科学

2D Materials Pub Date : 2023-04-25 DOI: 10.1088/2053-1583/acd012

Samuel Froeschke, Karl-Georg Schroth, U. Steiner, A. Popov, S. Schiemenz, Daniel Wolf, L. Giebeler, N. Gräßler, B. Büchner, Peer Schmidt, S. Hampel

{"title":"Understanding the chemistry of 2D rhodium trihalide solid solutions: tuning of optical properties and nanocrystal deposition","authors":"Samuel Froeschke, Karl-Georg Schroth, U. Steiner, A. Popov, S. Schiemenz, Daniel Wolf, L. Giebeler, N. Gräßler, B. Büchner, Peer Schmidt, S. Hampel","doi":"10.1088/2053-1583/acd012","DOIUrl":"https://doi.org/10.1088/2053-1583/acd012","url":null,"abstract":"In the search for novel 2D materials with potentially valuable properties, such as a tunable band gap for optoelectronic or catalytic applications, solid solutions hold the potential to significantly expand the inventory of available 2D nanomaterials. In this study, we present for the first time the synthesis of such 2D rhodium trihalide solid solutions: RhBr x Cl3−x and RhBr x I3−x . We use thermodynamic simulations and simultaneous thermal analysis to predict conditions for their rational synthesis and to investigate suitable chemical vapor transport (CVT) parameters for these solid solutions. The evolution of the lattice parameters was investigated by powder x-ray diffraction, showing an isostructural relationship of the synthesized compounds and only minor deviation from Vegard’s law. The optical band gap of these materials can be tuned in an energy range from 1.5 eV (RhCl3) to 1.2 eV (RhI3) by choosing the composition of the solid solution, while the samples also exhibit photoluminescence in similar energy ranges. Ultimately, the successful deposition of bulk as well as ultrathin 2D nanocrystals of RhBr x Cl3−x by CVT from 925 °C to 850 °C is shown, where the composition of the deposited crystals is precisely controlled by the choice of the starting composition and the initial amount of material. The high quality of the obtained nanocrystals is confirmed by atomic force microscopy, high resolution transmission electron microscopy and selected area electron diffraction. For RhBr x I3−x , the CVT from 900 °C to 825 °C is more difficult and has only been practically demonstrated for an exemplary case. According to the observed properties, these novel solid solutions and nanocrystals show a great potential for an application in optoelectronic devices.","PeriodicalId":6812,"journal":{"name":"2D Materials","volume":" ","pages":""},"PeriodicalIF":5.5,"publicationDate":"2023-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43532040","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

Formation mechanism of mirror twin grain boundaries in molecular beam epitaxy grown monolayer WSe2–MoSe2 lateral heterojunctions 分子束外延生长单层WSe2-MoSe2横向异质结中镜像孪晶界的形成机制

IF 5.5 3区材料科学

2D Materials Pub Date : 2023-04-14 DOI: 10.1088/2053-1583/accd06

Zhoubin Yu, Yawei Dai, H. Komsa, Xibiao Ren, Mengfei Yuan, M. Xie, C. Jin

{"title":"Formation mechanism of mirror twin grain boundaries in molecular beam epitaxy grown monolayer WSe2–MoSe2 lateral heterojunctions","authors":"Zhoubin Yu, Yawei Dai, H. Komsa, Xibiao Ren, Mengfei Yuan, M. Xie, C. Jin","doi":"10.1088/2053-1583/accd06","DOIUrl":"https://doi.org/10.1088/2053-1583/accd06","url":null,"abstract":"Mirror twin grain boundary (MTB) defects, being a special type of high-symmetry one-dimensional (1D) defects in two-dimensional atomically thin transition metal dichalcogenides (TMDCs), have received considerable interest due to their unique structures and intriguing 1D properties. However, formation and distribution of MTBs in hybrid TMDC materials such as heterojunction remain scarcely studied. Herein, we investigate the spatial distribution, lattice registry and formation mechanism of MTBs in molecular beam epitaxy grown monolayer WSe2–MoSe2 lateral heterojunctions using atomic-resolution annular dark-field scanning transmission electron microscopy (ADF-STEM). MTBs manifest a much higher density in MoSe2 than in WSe2 domains with a few of them spanning coherently across the domain interface. Compositionally, a Mo-dominant rather than W-dominant configuration was observed in those MTBs located in WSe2 domains and its origin can be attributed to the preferable Mo substitution to W along the MTBs occurring at the later MoSe2 growth period. This proposed mechanism is supported by ab-initio density functional theory calculations and substitution dynamics captured by in-situ ADF-STEM. The present study deepens our understanding of MTBs in heterostructured TMDCs, which may also serve as an excellent platform for the exploration of intriguing 1D physics.","PeriodicalId":6812,"journal":{"name":"2D Materials","volume":" ","pages":""},"PeriodicalIF":5.5,"publicationDate":"2023-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44930767","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: 1

Moiré modulation of lattice strains in PdTe2 quantum Films PdTe2量子膜晶格应变的莫尔调制

IF 5.5 3区材料科学

2D Materials Pub Date : 2023-04-13 DOI: 10.1088/2053-1583/accc9c

Jacob Cook, D. Halbertal, Qiangsheng Lu, Xiaoqian Zhang, C. Conner, Geoff Watson, M. Snyder, M. Pollard, Y. Hor, D. Basov, G. Bian

引用次数: 0

Growth and applications of two-dimensional single crystals 二维单晶的生长及其应用

IF 5.5 3区材料科学

2D Materials Pub Date : 2023-03-31 DOI: 10.1088/2053-1583/acc95a

Zhibin Zhang, S. Forti, Wanqing Meng, S. Pezzini, Zehua Hu, C. Coletti, Xinran Wang, Kaihui Liu

引用次数: 2

Tuning of the moiré bands in graphene on hexagonal boron nitride by the periodic electrostatic gating 六方氮化硼上石墨烯中莫尔条纹的周期性静电门控调谐

IF 5.5 3区材料科学

2D Materials Pub Date : 2023-03-30 DOI: 10.1088/2053-1583/acc8e8

Xianqing Lin, Kelu Su, Jun Ni

{"title":"Tuning of the moiré bands in graphene on hexagonal boron nitride by the periodic electrostatic gating","authors":"Xianqing Lin, Kelu Su, Jun Ni","doi":"10.1088/2053-1583/acc8e8","DOIUrl":"https://doi.org/10.1088/2053-1583/acc8e8","url":null,"abstract":"Moiré bands separated by the primary and secondary gaps emerge in the superlattices of monolayer (MLG) and bilayer graphene (BLG) aligned with the hexagonal boron nitride (BN). We study the tuning of the electronic and transport properties of such moiré superlattices through the periodic electrostatic potentials produced by the one-dimensional (1D) or two-dimensional (2D) patterned gating structure in the devices. The electrostatic potentials in graphene are produced by the spatially varying particle and hole doping due to the local quantum capacitance effect and can be modulated by the voltage ( VTG ) of the top patterned gating structure and that ( VBG ) of the uniform bottom gate. For the 1D devices of MLG/BN and BLG/BN, different sets of Fabry–Pérot interference like resistance patterns as a function of VTG and VBG can be observed when the Fermi level is shifted from the charge neutrality point (CNP) to the secondary gaps in MLG/BN and BLG/BN, and the overlapping regions of the patterns exhibit the highest resistance. The electronic states in these various regions of the resistance map show different moiré-band hybridization and spatial distribution. The secondary resistance patterns around the secondary gaps move away from the primary one with increasing twist angle (θ) between graphene and BN and their detailed patterns also depend on the orientation of the 1D potential with respect to that of the superlattice. The 2D periodic potentials can further split the subbands between CNP and the secondary gaps, depending on the commensurability of the moiré superlattice and the 2D potentials, and additional resistance peaks appear as a function of the gate voltages. The calculated resistance map for BLG/BN at θ∼1∘ is roughly consistent with recent experimental observations.","PeriodicalId":6812,"journal":{"name":"2D Materials","volume":"39 5","pages":""},"PeriodicalIF":5.5,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41260095","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

Graphene-black phosphorus printed photodetectors 石墨烯-黑磷印刷光电探测器

IF 5.5 3区材料科学

2D Materials Pub Date : 2023-03-24 DOI: 10.1088/2053-1583/acc74c

S. Akhavan, A. Ruocco, G. Soavi, A. Taheri, S. Mignuzzi, S. Doukas, Allison Cadore, Y. Samad, L. Lombardi, K. Dimos, I. Paradisanos, J. Muench, H. Watson, S. Hodge, L. Occhipinti, E. Lidorikis, I. Goykhman, A. Ferrari

{"title":"Graphene-black phosphorus printed photodetectors","authors":"S. Akhavan, A. Ruocco, G. Soavi, A. Taheri, S. Mignuzzi, S. Doukas, Allison Cadore, Y. Samad, L. Lombardi, K. Dimos, I. Paradisanos, J. Muench, H. Watson, S. Hodge, L. Occhipinti, E. Lidorikis, I. Goykhman, A. Ferrari","doi":"10.1088/2053-1583/acc74c","DOIUrl":"https://doi.org/10.1088/2053-1583/acc74c","url":null,"abstract":"Layered materials (LMs) produced by liquid phase exfoliation (LPE) can be used as building blocks for optoelectronic applications. However, when compared with mechanically exfoliated flakes, or films prepared by chemical vapor deposition (CVD), LPE-based printed optoelectronic devices are limited by mobility, defects and trap states. Here, we present a scalable fabrication technique combining CVD with LPE LMs to overcome such limitations. We use black phosphorus inks, inkjet-printed on graphene on Si/SiO2, patterned by inkjet printing based lithography, and source and drain electrodes printed with an Ag ink, to prepare photodetectors (PDs). These have an external responsivity (R ext)∼337 A W−1 at 488 nm, and operate from visible (∼488 nm) to short-wave infrared (∼2.7 µm, R ext∼ 48 mA W−1). We also use this approach to fabricate flexible PDs on polyester fabric, one of the most common used in textiles, achieving R ext∼ 6 mA W−1 at 488 nm for an operating voltage of 1 V. Thus, our combination of scalable CVD and LPE techniques via inkjet printing is promising for wearable and flexible applications.","PeriodicalId":6812,"journal":{"name":"2D Materials","volume":" ","pages":""},"PeriodicalIF":5.5,"publicationDate":"2023-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45136944","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: 2

Sulfur isotope engineering of exciton and lattice dynamics in MoS2 monolayers MoS2单层中激子的硫同位素工程和晶格动力学

IF 5.5 3区材料科学

2D Materials Pub Date : 2023-03-16 DOI: 10.1088/2053-1583/acc4d8

Vaibhav Varade, G. Haider, L. Pirker, Jaganandha Panda, J. Sýkora, O. Frank, M. Kalbáč, J. Vejpravová

{"title":"Sulfur isotope engineering of exciton and lattice dynamics in MoS2 monolayers","authors":"Vaibhav Varade, G. Haider, L. Pirker, Jaganandha Panda, J. Sýkora, O. Frank, M. Kalbáč, J. Vejpravová","doi":"10.1088/2053-1583/acc4d8","DOIUrl":"https://doi.org/10.1088/2053-1583/acc4d8","url":null,"abstract":"The optoelectronic properties of two-dimensional (2D) atomically thin transition metal dichalcogenides (TMDCs) are predominantly governed by excitons and their interaction with lattice and various physical fields. Therefore, it is essential to understand the role played by excitons in the light–matter interaction processes. We introduce sulfur isotope engineering for the first time in the TMDC family, which enables us to disentangle the crucial role played by phonons in the optoelectronic properties of TMDCs. With the gradual introduction of heavier isotopes in chemical vapor deposition growth MoS2 , we discovered a systematic variation of lattice phonon energy. Consequently, the transient and steady-state spontaneous photoluminescence spectra were dramatically altered. Accordingly, the isotopically pure monolayers (MLs) show more intrinsic properties with enhanced emission efficiencies than isotopically mixed MoS2 MLs. The variation of the free exciton energies with temperature for the isotopically modified MoS2 MLs can be well described by Varshini’s equation. Along with the enormous significance for practical applications, our study provides a unique platform to understand the fundamentals of optical processes in 2D systems, where the lattice-related quasi-particles play a dominant role.","PeriodicalId":6812,"journal":{"name":"2D Materials","volume":" ","pages":""},"PeriodicalIF":5.5,"publicationDate":"2023-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49591250","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

Comparative radiosensitization efficiency assessment of graphene oxide and Ti3C2 MXene as 2D carbon-based nanoparticles against breast cancer cells: characterization, toxicity and mechanisms 氧化石墨烯和Ti3C2 MXene作为2D碳基纳米颗粒对乳腺癌症细胞的放射增敏效率比较评估：表征、毒性和机制

IF 5.5 3区材料科学

2D Materials Pub Date : 2023-03-14 DOI: 10.1088/2053-1583/acc413

Hoomaan Joze-Majidi, Erfan Zabihi, Z. Arab‐Bafrani, Seyed Mostafa Mir, R. Reiter

{"title":"Comparative radiosensitization efficiency assessment of graphene oxide and Ti3C2 MXene as 2D carbon-based nanoparticles against breast cancer cells: characterization, toxicity and mechanisms","authors":"Hoomaan Joze-Majidi, Erfan Zabihi, Z. Arab‐Bafrani, Seyed Mostafa Mir, R. Reiter","doi":"10.1088/2053-1583/acc413","DOIUrl":"https://doi.org/10.1088/2053-1583/acc413","url":null,"abstract":"The efficacy of two carbon-based nanomaterials, graphene oxide (GO) and Ti3C2 MXene (MX), on the radiosensitivity of the breast cancer cells (BCCs) was investigated using clinical x-ray irradiation. The prepared GO and MX nanoparticles (NPs) were firstly characterized utilizing Fourier transform infrared, ultraviolet–visible, atomic force microscopy and transmission electron microscopy techniques and subsequently assessed in terms of their radiobiological properties. The results of the cell toxicity assay indicated that neither NPs exhibited significant cytotoxicity after 48 h incubation with BCC up to 50 µg ml−1 concentration without irradiation. The cell internalization results showed an approximately equivalent cellular uptake for both NPs after 6 h incubation with BCC. Our comparative studies with radiotherapy demonstrated that both NPs substantially increased cell proliferation inhibition and cell apoptosis of BCC under x-ray irradiation when compared to BCC treated with irradiation alone. Additionally, the 2ʹ,7ʹ-dichlorofluorescin diacetate flow cytometry results and fluorescent microscopy images revealed that both NPs remarkably increased the level of intracellular reactive oxygen species (ROS) generation in BCC under x-ray irradiation. The MX nanosheets exhibited superior radiosensitization efficiency than GO under x-ray irradiation due to its higher level of intracellular ROS generation (MX = 75.2% and GO = 65.2%). Clonogenic cell survival assay and extracted radiobiological parameters revealed that both NPs in combination with x-ray irradiation induced more lethal damage and less sublethal damage to BCC. Generally, the obtained results demonstrate that the MX NPs, as a stronger radiosensitizer than GO, could be a promising candidate for enhancing the effectiveness of radiotherapy in breast cancer treatment.","PeriodicalId":6812,"journal":{"name":"2D Materials","volume":" ","pages":""},"PeriodicalIF":5.5,"publicationDate":"2023-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48963159","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: 3