Article
Chemistry, Multidisciplinary
Bo Tian, Junzhu Li, Mingguang Chen, Haocong Dong, Xixiang Zhang
Summary: This article presents an in-situ CVD growth strategy for synthesizing large-scale single-crystal graphene/hBN/graphene trilayer van der Waals heterostructures. The stacking modes of the 2D layers were investigated, providing a method for directly synthesizing large-scale single-crystal low-dimensional van der Waals heterostructures.
Article
Nanoscience & Nanotechnology
Jacopo Oswald, Davide Beretta, Michael Stiefel, Roman Furrer, Alessia Romio, Michel Daher Mansour, Dominique Vuillaume, Michel Calame
Summary: This work investigates the charge injection and transport across Au/OSC/Gr vertical heterostructures, where the PMMA-free graphene layer functions as the top electrode. The research shows that the charge transport is limited by thermionic emission at high bias and by space charge at low bias.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Review
Chemistry, Multidisciplinary
Xiangdong Guo, Wei Lyu, Tinghan Chen, Yang Luo, Chenchen Wu, Bei Yang, Zhipei Sun, F. Javier Garcia de Abajo, Xiaoxia Yang, Qing Dai
Summary: 2D monolayers can be vertically stacked in van der Waals heterostructures to support a wide range of confined polaritons. This offers advantages in terms of controlling the constituent layers, stacking sequence, and twist angles. These heterostructures have extended the performance and functions of polaritons, and potential applications include nanophotonic integrated circuits.
ADVANCED MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Xin He, Chenhui Zhang, Dongxing Zheng, Peng Li, John Q. Xiao, Xixiang Zhang
Summary: With the recent advancements in two-dimensional ferromagnets, it is now feasible to develop high-quality all-2D spintronic devices. In this study, nonlocal spin valves were successfully fabricated using Fe3GeTe2 as the spin source and detector and multilayer graphene as the spin transport channel. The spin transport signal strongly depended on temperature and vanished below the Curie temperature of the Fe3GeTe2 flakes. Our results suggest potential applications of van der Waals heterostructures in spintronic devices.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Zongqi Bai, Yang Xiao, Qing Luo, Miaomiao Li, Gang Peng, Zhihong Zhu, Fang Luo, Mengjian Zhu, Shiqiao Qin, Kostya Novoselov
Summary: The emergence of two-dimensional materials has led to important applications in electronic and optoelectronic devices. However, there are limitations such as low ON/OFF ratio and Schottky barrier formation. In this study, highly tunable field-effect tunneling transistors based on vertical graphene-WS2-graphene heterostructures were demonstrated, overcoming these limitations and achieving low off-state current, high ON/OFF ratio, and controllable carrier transport polarity.
Review
Chemistry, Multidisciplinary
Hui-Lei Hou, Cosimo Anichini, Paolo Samori, Alejandro Criado, Maurizio Prato
Summary: In the past 15 years, 2D materials have revolutionized materials science and become powerful components for high-performance chemical sensors. By forming van der Waals heterostructures (VDWHs), the individual drawbacks of 2D materials can be overcome, leading to superior sensitivities, selectivity, and stability. This review discusses the latest developments in chemical sensors based on VDWHs of 2D materials, including sensing mechanisms and future directions with potential impact in environmental sciences and biomedical applications.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Carla Boix-Constant, Samuel Manas-Valero, Rosa Cordoba, Jose J. Baldovi, Angel Rubio, Eugenio Coronado
Summary: Layered materials, such as 1T-TaS2, are excellent for studying the interplay between in-plane and out-of-plane entanglement in strongly correlated systems. Experimental findings supported by DFT+U calculations reveal dimensionality as a key factor in understanding quantum materials like 1T-TaS2. The presence of an energy gap in the few-layer limit highlights the possible experimental realization of low-dimensional quantum spin liquid states.
Review
Materials Science, Multidisciplinary
Lixin Liu, Tianyou Zhai
Summary: The article reviews the latest research activities on wafer-scale vdWHs and their applications, outlining preparation strategies and applications to showcase their potential in electronic, optoelectronic, and flexible devices fields.
Article
Engineering, Mechanical
Guoliang Ru, Weihong Qi, Yaru Wei, Kewei Tang, Taowen Xue
Summary: The study reveals that the superlubricity properties in two-dimensional tellurene isomers and tellurene-graphene heterostructures vary significantly, with the friction coefficient of stacking G/13-Te being affected by different stacking structures, while superlubricity can be achieved in a wider range of interlayer angles in the G/?-Te system.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Duan Luo, Jian Tang, Xiaozhe Shen, Fuhao Ji, Jie Yang, Stephen Weathersby, Michael E. Kozina, Zhijiang Chen, Jun Xiao, Yusen Ye, Ting Cao, Guangyu Zhang, Xijie Wang, Aaron M. Lindenberg
Summary: The study utilized ultrafast electron diffraction to simultaneously visualize charge transfer and electron-phonon coupling in MoS2-graphene heterostructures. It was found that the timescale of charge transfer and relaxation varies significantly with twist angle, indicating that twist angle can serve as an additional tuning knob for interlayer charge transfer in heterobilayers. The research deepened the understanding of fundamental photophysical processes in heterostructures, which is important for future applications in optoelectronics and light harvesting.
Article
Chemistry, Multidisciplinary
Muhammad A. K. Purbayanto, Madhurya Chandel, Magdalena Birowska, Andreas Rosenkranz, Agnieszka M. Jastrzebska
Summary: This article discusses the fundamental basis and recent findings in vertical vdW heterostructures composed of MXenes as a primary component and other 2D materials as secondary components. MXenes, with their rich surface chemistry and intriguing optical properties, offer a unique platform for optoelectronics applications. Coupling MXenes with other 2D materials in vdW heterostructures can provide new opportunities for exploring novel physical phenomena in quantum-confined nanostructures and devices.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Andrey Yu Klokov, Nikolay Yu Frolov, Andrey Sharkov, Sergey N. Nikolaev, Maxim A. Chernopitssky, Semen Chentsov, Mikhail Pugachev, Aliaksandr Duleba, Alexey Shupletsov, Vladimir S. Krivobok, Aleksandr Yu Kuntsevich
Summary: This study explores the mechanical properties of layered crystals in the few layer limit using picosecond ultrasonic technique. By measuring the temporal variation of the reflection coefficient of an Al film covering heterostructures, the mechanical parameters and rigidity of the interfaces can be evaluated. The results demonstrate the potential of van der Waals heterostructures for nanoacoustical applications.
Article
Chemistry, Multidisciplinary
Maria G. Burdanova, Ming Liu, Michael Staniforth, Yongjia Zheng, Rong Xiang, Shohei Chiashi, Anton Anisimov, Esko Kauppinen, Shigeo Maruyama, James Lloyd-Hughes
Summary: Strong intertube excitonic coupling is demonstrated in 1D van der Waals heterostructures through the interaction of dipole-dipole Coulomb interactions and light-matter interactions. This leads to the creation of intertube biexcitons on short timescales and intertube excitons on longer timescales, which opens up new possibilities for multi-functional applications of these new nanoscale coaxial cables.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Xin Wu, Qiang Han
Summary: This study systematically investigated the phonon thermal transport across multilayer Gr/h-BN vdW heterostructures, revealing important findings on the structural configuration and external modulation at the Gr/h-BN interface. It uncovers the physical mechanisms underlying the changes in the interfacial thermal conductance (ITC) and suggests directions for its modulation.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Analytical
Do-Hyun Park, Hyo Chan Lee
Summary: The development of short-wave infrared photodetectors based on different 2D materials operating at room temperature has attracted attention. Van der Waals heterostructures of 2D materials with type-II band alignment have potential for use in photodetectors, but high photoresponsivity is essential. In this study, we investigated the photogating of graphene using a monolayer-MoS2/monolayer-MoTe2 van der Waals heterostructure. By stacking MoS2/MoTe2 on graphene, a broadband photodetector with high photoresponsivity (>100 mA/W) and low dark current (60 nA) across a wide wavelength range (488-1550 nm) was fabricated.
Article
Chemistry, Physical
Tatiana Latychevskaia, Colin Robert Woods, Yi Bo Wang, Matthew Holwill, Eric Prestat, Sara Mustafi, Sarah J. Haigh, Konstantin S. Novoselov
Summary: This study demonstrates the possibility of directly measuring scattering parameters through the intensity distribution of spots in CBED patterns. A method for recovering atomic scattering parameters from CBED patterns is proposed and validated through experiments and simulations.
Article
Chemistry, Multidisciplinary
Mary Burkitt-Gray, Marianna Casavola, Pip C. J. Clark, Simon M. Fairclough, Wendy R. Flavell, Roland A. Fleck, Sarah J. Haigh, Jack Chun-Ren Ke, Marina Leontiadou, Edward A. Lewis, Jacek Osiecki, Basma Qazi-Chaudhry, Gema Vizcay-Barrena, Wijittra Wichiansee, Mark Green
Summary: Fluorescent InP-based quantum dots, combined with zinc and ZnS or CdS shells, have been synthesized using zinc carboxylates and diethyldithiocarbamate precursors. The addition of zinc enhances the emissive and structural properties of the quantum dots, while reducing interfacial defects. Structural analysis reveals that the core/shell particles are homogeneous extended alloys with full-depth inclusion of zinc.
Article
Chemistry, Multidisciplinary
Amaresh Shukla, Shouqi Shao, Sadie Carter-Searjeant, Sarah Haigh, David Richards, Mark Green, Anatoly V. Zayats
Summary: Copper sulphide (covellite) nanoplatelets have emerged as a plasmonic platform in the near-infrared with ultrafast nonlinear optical properties. The free-carrier density in CuS can be further tuned by chemical doping, using ion exchange to replace Cu with increasing content of Zn in the nanoparticles. This approach provides new opportunities for tuning the plasmonic response of covellite nanocrystals and the carrier relaxation time.
Article
Physics, Multidisciplinary
Enze Zhang, Ying-Ming Xie, Yuqiang Fang, Jinglei Zhang, Xian Xu, Yi-Chao Zou, Pengliang Leng, Xue-Jian Gao, Yong Zhang, Linfeng Ai, Yuda Zhang, Zehao Jia, Shanshan Liu, Jingyi Yan, Wei Zhao, Sarah J. Haigh, Xufeng Kou, Jinshan Yang, Fuqiang Huang, K. T. Law, Faxian Xiu, Shaoming Dong
Summary: Researchers have discovered a new form of superconductivity in which strong spin-orbit coupling combines with topological band inversions to make the superconductor highly resistant to magnetic fields. This finding provides insights into the interplay between superconductivity, topology, and strong spin-orbit coupling.
Article
Chemistry, Multidisciplinary
James E. E. Nunn, Andrew McEllistrim, Astrid Weston, Aitor Garcia-Ruiz, Matthew D. D. Watson, Marcin Mucha-Kruczynski, Cephise Cacho, Roman V. V. Gorbachev, Vladimir I. I. Fal'ko, Neil R. R. Wilson
Summary: Researchers used angle-resolved photoemission spectroscopy to study the twist-dependent band structure of twisted-graphene layers, validating models and revealing field-induced gaps. However, a discrepancy was found in the gap between the flat band and the next valence band in tDBG, indicating lattice relaxation in this regime.
Article
Materials Science, Multidisciplinary
Kevin Synnatschke, Jonas van Dinter, Alina Mueller, David Tiede, Lena Spillecke, Shouqi Shao, Daniel Kelly, Jan Konecny, Bharathi Konkena, Mark McCrystall, Nihit Saigal, Ursula Wurstbauer, Wolfgang Bensch, Zdenek Sofer, Jonathan N. Coleman, Ruediger Klingeler, Sarah J. Haigh, Claudia Backes
Summary: The family of antiferromagnetic layered metal hexathiohypo diphosphates, M2P2S6, is a versatile class of materials with potential applications in various fields. In this study, three representatives of this family (M = Fe, Ni, and Mn) were exfoliated in liquid phase and their properties were characterized. The exfoliability and structural integrity of nanosheets were evaluated using atomic force microscopy and transmission electron microscopy. Optical and magnetic properties of these nanomaterials were also investigated using spectroscopic techniques. Additionally, the stability of these materials was studied by measuring their degradation under different conditions.
Article
Chemistry, Multidisciplinary
Jie Qu, Amr Elgendy, Rongsheng Cai, Mark A. Buckingham, Athanasios A. Papaderakis, Hugo de Latour, Kerry Hazeldine, George F. S. Whitehead, Firoz Alam, Charles T. Smith, David J. Binks, Alex Walton, Jonathan M. Skelton, Robert A. W. Dryfe, Sarah J. Haigh, David J. Lewis
Summary: In this study, a low-temperature and rapid approach was used to synthesize a high-entropy metal disulfide (MoWReMnCr)S-2. The resulting nanosheets showed a homogeneous distribution of metals and exhibited excellent hydrogen evolution electrocatalytic activity.
Article
Chemistry, Multidisciplinary
Yi-Chi Wang, Thomas J. A. Slater, Gerard M. Leteba, Candace I. Lang, Zhong Lin Wang, Sarah J. Haigh
Summary: Tailoring the composition and morphology of nanoparticles is crucial for improving their catalytic performance. This study presents an in situ 3D imaging methodology using single particle reconstruction (SPR) that allows for the investigation of structural transformations and elemental redistribution in nanoparticles. The methodology is applied to study the restructuring of PtNi nanoparticles at elevated temperatures and reveals a transition from a disordered to an ordered phase. The changes in structure and elemental distribution are correlated with a decrease in catalytic activity. This in situ SPR methodology can be extended to study nanoparticle evolution in various environments.
Article
Chemistry, Multidisciplinary
Meshal Aljohani, Helen Daly, Lan Lan, Aristarchos Mavridis, Matthew Lindley, Sarah J. Haigh, Carmine D'Agostino, Xiaolei Fan, Christopher Hardacre
Summary: H-2 production from photoreforming of organosolv lignin is lower compared to that from cellulose, but can be enhanced by cycling the catalyst.
Article
Chemistry, Physical
James Paterson, David Brown, Sarah J. Haigh, Philip Landon, Qizhen Li, Matthew Lindley, Mark Peacock, Hendrik van Rensburg, Zhuoran Xu
Summary: Fischer-Tropsch (FT) synthesis is being reconsidered due to its potential in producing sustainable fuels from renewable sources. In this study, a new catalyst support material called manganese titanate showed a switch in selectivity from oxygenated products to high quality linear paraffins. The performance of the MnTiO3 support material was substantially different from conventional Mn impregnated TiO2 support, and only required a modest thermal treatment for activation. The cobalt supported on MnTiO3 also exhibited higher selectivity and conversion compared to the conventional Co/Mn/TiO2 catalyst.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
T. Johnsen, C. Schattauer, S. Samaddar, A. Weston, M. J. Hamer, K. Watanabe, T. Taniguchi, R. Gorbachev, F. Libisch, M. Morgenstern
Summary: Researchers used scanning tunneling microscopy to investigate the quantum Hall edge states of monolayer graphene and compared the results with theoretical calculations. They found that a proper choice of gate voltage allowed for accurate mapping of the edge state pattern, and observed extended compressible regions, the antinodal structure of edge states, and their meandering along the lateral interface.
Article
Engineering, Electrical & Electronic
Wendong Wang, Nicholas Clark, Matthew Hamer, Amy Carl, Endre Tovari, Sam Sullivan-Allsop, Evan Tillotson, Yunze Gao, Hugo de Latour, Francisco Selles, James Howarth, Eli G. Castanon, Mingwei Zhou, Haoyu Bai, Xiao Li, Astrid Weston, Kenji Watanabe, Takashi Taniguchi, Cecilia Mattevi, Thomas H. Bointon, Paul V. Wiper, Andrew J. Strudwick, Leonid A. Ponomarenko, Andrey V. Kretinin, Sarah J. Haigh, Alex Summerfield, Roman Gorbachev
Summary: We report a polymer-free technique for assembling van der Waals heterostructures using flexible silicon nitride membranes. This technique allows the fabrication of high-quality heterostructures in harsher environmental conditions, resulting in improved electronic and optoelectronic behavior. Specifically, we demonstrate the improved homogeneity of moire superlattices in twisted-graphene heterostructures assembled using this technique.
NATURE ELECTRONICS
(2023)
