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
Sunchao Huang, Ruihuan Duan, Nikhil Pramanik, Chris Boothroyd, Zheng Liu, Liang Jie Wong
Summary: Van der Waals materials have unique electronic, mechanical, and thermal properties, making them attractive for various applications. This study demonstrates that the versatility of table-top vdW X-ray sources can be expanded by introducing a tilt angle, resulting in a doubled accessible photon energy range. Furthermore, simultaneous control of electron energy and vdW structure tilt maximizes the accessible photon energy range, paving the way for highly tunable, compact X-ray sources.
Article
Chemistry, Multidisciplinary
Wenjing Song, Lingan Kong, Quanyang Tao, Qing Liu, Xiangdong Yang, Jia Li, Huigao Duan, Xidong Duan, Lei Liao, Yuan Liu
Summary: The novel van der Waals (vdW) stencil lithography technique developed in this study allows for the fabrication of high performance transistors on 2D semiconductors without inducing damage, and provides a new high resolution lithography technique for 2D materials.
Article
Materials Science, Multidisciplinary
J. Marcelo J. Lopes, Dietmar Czubak, Eugenio Zallo, Adriana Figueroa, Charles Guillemard, Manuel Valvidares, Juan Rubio-Zuazo, Jesus Lopez-Sanchez, Sergio O. Valenzuela, Michael Hanke, Manfred Ramsteiner
Summary: The scalable fabrication of magnetic 2D materials and heterostructures using van der Waals epitaxy has been achieved with the successful growth of layered magnetic metal Fe3GeTe2 on graphene. The resulting FGT/graphene heterostructure films exhibit stable interfaces and good crystalline quality, with robust out-of-plane ferromagnetism comparable to exfoliated flakes from bulk crystals. These results are crucial for the advancement of wafer-scale growth of vdW heterostructures combining FGT with other layered crystals for multifunctional, atomically thin devices.
Article
Materials Science, Multidisciplinary
Yixuan Ren, Meng Wei, Sijie Wang, Xingzhao Liu
Summary: One of the major obstacles for the integration of PbSe with Si-based electronics is the lattice mismatch between PbSe and Si. In this work, the potential solution for relaxing the lattice mismatch between PbSe and Si by using van der Waals materials such as graphene and Bi2Se3 is explored.
Article
Nanoscience & Nanotechnology
Jakub Sitek, Karolina Czerniak-Losiewicz, Arkadiusz P. Gertych, Malgorzata Giza, Pawel Dabrowski, Maciej Rogala, Konrad Wilczynski, Anna Kaleta, Slawomir Kret, Ben R. Conran, Xiaochen Wang, Clifford McAleese, Michal Macha, Aleksandra Radenovic, Mariusz Zdrojek, Iwona Pasternak, Wlodek Strupinski
Summary: Researchers have achieved the selective fabrication of van der Waals heterostructures (vdWHSs) using chemical vapor deposition by electron-beam irradiation. They have identified two growth modes, positive (P) mode on graphene and tungsten disulfide (WS2) substrates, and negative (N) mode on the graphene substrate. The growth mode can be controlled by limiting the air exposure and the time between irradiation and growth. The selective growth mechanism is explained by the competition of three effects: EB-induced defects, adsorption of carbon species, and electrostatic interaction. This study is a critical step towards industry-scale fabrication of 2D-materials-based devices.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Bing Zhao, Roselle Ngaloy, Sukanya Ghosh, Soheil Ershadrad, Rahul Gupta, Khadiza Ali, Anamul Md. Hoque, Bogdan Karpiak, Dmitrii Khokhriakov, Craig Polley, Balasubramanian Thiagarajan, Alexei Kalaboukhov, Peter Svedlindh, Biplab Sanyal, Saroj P. Dash
Summary: This article demonstrates the robust room-temperature operation of lateral spin-valve devices using the vdW ferromagnet Fe5GeTe2 in heterostructures with graphene. Spin-dynamics measurements reveal multidirectional spin polarization at the Fe5GeTe2/graphene interface. Density functional theory calculations and Monte Carlo simulations reveal significantly canted Fe magnetic moments in Fe5GeTe2 along with the presence of negative spin polarization at the interface. These findings open opportunities for vdW interface design and applications of vdW-magnet-based spintronic devices at ambient temperatures.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
He Hao, Miao-Ling Lin, Bo Xu, Heng Wu, Yuechen Wang, Hailin Peng, Ping-Heng Tan, Lianming Tong, Jin Zhang
Summary: The characterization of interlayer coupling in two-dimensional van der Waals heterostructures (vdWHs) is crucial for understanding their quantum behaviors and structural functionalities. Twisted bilayer graphene (tBLG) provides a universal strategy to enhance layer-breathing (LB) phonons in vdWHs. By resonantly exciting electrons in tBLG, LB phonons extended over the entire layers in vdWHs can be strongly coupled, and this coupling can be tuned by the twist angle of tBLG. This method of enhancing LB phonons by tBLG is promising for investigating electron-phonon coupling and interlayer interaction in related vdWHs.
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)
Article
Materials Science, Multidisciplinary
Wen Zhang, Ping Kwan Johnny Wong, Sheng Jiang, Qian Chen, Wei Huang, Andrew Thye Shen Wee
Summary: This review critically evaluates the state-of-the-art of van der Waals interfaces and their potential technological applications in spintronics. It highlights major challenges, proposes a viable solution, and identifies emerging spin-based technologies that could benefit from the versatile van der Waals interfaces enabled by the strategy.
Article
Nanoscience & Nanotechnology
Che-Yi Lin, Mu-Pai Lee, Yuan-Ming Chang, Yi-Tang Tseng, Feng-Shou Yang, Mengjiao Li, Jiann-Yeu Chen, Ciao-Fen Chen, Meng-Yu Tsai, Yi-Chun Lin, Keiji Ueno, Mahito Yamamoto, Shun-Tsung Lo, Chen-Hsin Lien, Po-Wen Chiu, Kazuhito Tsukagoshi, Wen-Wei Wu, Yen-Fu Lin
Summary: This research demonstrates that diffused electron beam energy (DEBE) treatment can lower the Schottky barrier height and enable direct writing of electrical circuitry on van der Waals semiconductors. DEBE allows for selective-area doping, enabling the formation of both n-type and p-type doped channels within the same atomic plane, resulting in nonvolatile and homogeneous devices.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Xiangshun Geng, Peigen Zhang, Jun Ren, Guan-Hua Dun, Yuanyuan Li, Jialun Jin, Chaolun Wang, Xing Wu, Dan Xie, He Tian, Yi Yang, Tian-Ling Ren
Summary: In this study, a monolithic integrated graphene/perovskite heterojunction device was fabricated by directly growing a single-crystal hybrid perovskite on monolayer graphene. The device exhibited self-powering behavior and prominent photoresponse properties.
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.
Article
Materials Science, Multidisciplinary
Ziqi Li, Xujiang Chao, Andrew Balilonda, Wei Chen
Summary: Graphene shows great advantages in mid-infrared (MIR) regulation due to active control, precise regulation, and large modulation depth. However, current methods for preparing graphene films have limitations in large-scale production and application. This study proposes a simple mechanical adhesion method to prepare large-area van der Waals (vdW) graphene films without any additives. The obtained films possess desired thickness and comparable electrical conductivity, and exhibit excellent electrochemical activity and electro-optical regulation capability.
Article
Chemistry, Multidisciplinary
Dmitry A. Mylnikov, Elena I. Titova, Mikhail A. Kashchenko, Ilya V. Safonov, Sergey S. Zhukov, Valentin A. Semkin, Kostya S. Novoselov, Denis A. Bandurin, Dmitry A. Svintsov
Summary: This study investigates the sub-terahertz photoconductivity of gapped bilayer graphene with electrically induced p-n junctions. The results show that these junctions have a strong positive contribution to resistance, temperature resistance coefficient, and photoresistivity at cryogenic temperatures.
Article
Optics
Jingxuan Wei, Yang Chen, Ying Li, Wei Li, Junsheng Xie, Chengkuo Lee, Kostya S. Novoselov, Cheng-Wei Qiu
Summary: This study presents a novel approach for circularly polarized light detection in the mid-infrared region, using geometric photodetectors and graphene ribbons. It offers a high-quality, filterless solution for on-chip CPL detection.
Article
Chemistry, Multidisciplinary
Elena Titova, Dmitry Mylnikov, Mikhail Kashchenko, Ilya Safonov, Sergey Zhukov, Kirill Dzhikirba, Kostya S. Novoselov, Denis A. Bandurin, Georgy Alymov, Dmitry Svintsov
Summary: Graphene's high carrier mobility, compatibility with on-chip waveguides and transistors, and small heat capacitance make it a promising material for the detection of terahertz (THz) radiation. However, the weak reaction of graphene's physical properties to the detected radiation is due to the absence of a band gap. This study investigates the effect of electrically induced band gap on THz detection in graphene bilayer with split-gate p-n junction, and demonstrates that the induction of a band gap leads to increased current and voltage responsivities.
Article
Chemistry, Multidisciplinary
Dali Ji, Yunah Lee, Yuta Nishina, Kazuhide Kamiya, Rahman Daiyan, Dewei Chu, Xinyue Wen, Masamichi Yoshimura, Priyank Kumar, Daria V. Andreeva, Kostya S. Novoselov, Gwan-Hyoung Lee, Rakesh Joshi, Tobias Foller
Summary: This study introduces a simple electrochemical method utilizing the angstrom confinement of laminar rGO nanochannels to achieve atomically thin transition metal oxides. The method allows for sub-unit-cell growth of 2D-TMO and demonstrates a balance between high activity and stability.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
M. Grzeszczyk, S. Acharya, D. Pashov, Z. Chen, K. Vaklinova, M. van Schilfgaarde, K. Watanabe, T. Taniguchi, K. S. Novoselov, M. I. Katsnelson, M. Koperski
Summary: It is discovered that despite similar structural and magnetic configurations, the coupling between excitons and magnetization is qualitatively different in CrBr3 and CrI3 films. Through a combination of optical spin pumping experiments and state-of-the-art theory, it is concluded that the hole-magnetization coupling has the opposite sign in CrBr3 and CrI3, as well as between the ground and excited exciton state. Efficient spin pumping capabilities are demonstrated in CrBr3 driven by magnetization via spin-dependent absorption, and the different origins of the magnetic hysteresis in CrBr3 and CrI3 are unraveled.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Mariana C. F. Costa, Pei Rou Ng, Sergey Grebenchuck, Jun You Tan, Gavin K. W. Koon, Hui Li Tan, Colin R. Woods, Ricardo K. Donato, Kostya S. Novoselov, Antonio H. Castro Neto
Summary: One of the important characteristics of 2D electrolytes is their ability to transform into 1D structures like nanoscrolls. However, these 1D structures are soft, unstable, and have poor electrical conductivity. Through the use of atomic force microscopy and electrical transport measurements, researchers have found that one-step, catalyst-free graphitization of graphene nanoscrolls enhances their structural stability and reduces their structural disorder. These changes in physical properties open up possibilities for the study of exotic materials and various industrial applications.
Article
Multidisciplinary Sciences
Ye-Chuang Han, Jun Yi, Beibei Pang, Ning Wang, Xu-Cheng Li, Tao Yao, Kostya S. Novoselov, Zhong-Qun Tian
Summary: A novel graphene-confined ultrafast radiant heating (GCURH) method is developed to synthesize high-loading metal cluster catalysts in microseconds, overcoming the trade-off between ultrasmall size and high loading. The graphene acts as a diffusion-constrained nanoreactor, providing kinetics-dominant and diffusion-constrained conditions for the synthesis of subnanometer metal clusters.
NATIONAL SCIENCE REVIEW
(2023)
Correction
Nanoscience & Nanotechnology
Pengru Huang, Ruslan Lukin, Maxim Faleev, Nikita Kazeev, Abdalaziz Rashid Al-Maeeni, Daria V. Andreeva, Andrey Ustyuzhanin, Alexander Tormasov, A. H. Castro Neto, Kostya S. Novoselov
NPJ 2D MATERIALS AND APPLICATIONS
(2023)
Article
Engineering, Manufacturing
Yihe Huang, Yize Li, Kewen Pan, Yixian Fang, Kai Chio Chan, Xiaoyu Xiao, Chao Wei, Kostya S. Novoselov, John Gallop, Ling Hao, Zhu Liu, Zhirun Hu, Lin Li
Summary: We report a new laser-based method for producing ultrawideband metamaterial-based microwave absorbers with uniform sheet resistance and negative magnetic permeability, resulting in a wide bandwidth. The absorbers show high microwave absorption coefficient within a certain frequency range, and can be used in aviation, EMI suppression, and 5G applications.
INTERNATIONAL JOURNAL OF EXTREME MANUFACTURING
(2023)
Article
Chemistry, Multidisciplinary
Wenyuan Huang, Qingqing Mei, Shaojun Xu, Bing An, Meng He, Jiangnan Li, Yinlin Chen, Xue Han, Tian Luo, Lixia Guo, Joseph Hurd, Daniel Lee, Evan Tillotson, Sarah Haigh, Alex Walton, Sarah Day, Louise Natrajan, Martin Schroeder, Sihai Yang
Summary: This study reports the direct synthesis of N-formamides by coupling reductive amination of carbonyl compounds and CO2 fixation. A ruthenium catalyst supported by a metal-organic framework was used to achieve highly selective production of N-formamides. The presence of host-guest binding interactions between the catalyst and adsorbed substrates facilitated the activation of substrates and promoted selectivity.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Physical
Kendon Shirley, Hsinhan Tsai, Nicholas Cucciniello, Jonathan Bird, Quanxi Jia, Elias Torres, Phil Butler, Anthony Butler, Jerome Crocco, Eslam Taha, Abdulsalam Alhawsawi, Jessica Germino, Maoz Dor, Chaochao Dun, Omer Firat, Jared Parker, Matt Graham, Kostya S. Novoselov, Wanyi Nie
Summary: We have developed a recyclable perovskite-graphene heterostructure for high-performance X-ray detection in medical imaging. The graphene pixel maintains high mobility even after perovskite deposition, enabling efficient conversion for ultrahigh sensitivity. By increasing the operational bias of the graphene channel, the signal-to-noise ratio of X-ray detection can be significantly improved. The perovskite layer can be easily washed off without damaging the graphene, making our heterostructure X-ray detector recyclable.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Physical
Nikita Kazeev, Abdalaziz Rashid Al-Maeeni, Ignat Romanov, Maxim Faleev, Ruslan Lukin, Alexander Tormasov, A. H. Castro Neto, Kostya S. Novoselov, Pengru Huang, Andrey Ustyuzhanin
Summary: Two-dimensional materials offer a promising platform for next-generation electronic devices and high-tech applications. We propose a machine learning approach to estimate the properties of 2D materials based on their lattice structure and defect configuration, allowing for rapid tuning of material properties. Our methodology outperforms state-of-the-art approaches in terms of energy prediction accuracy and resource efficiency.
NPJ COMPUTATIONAL MATERIALS
(2023)
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
Chemistry, Multidisciplinary
D. V. Grudinin, G. A. Ermolaev, D. G. Baranov, A. N. Toksumakov, K. V. Voronin, A. S. Slavich, A. A. Vyshnevyy, A. B. Mazitov, I. A. Kruglov, D. A. Ghazaryan, A. V. Arsenin, K. S. Novoselov, V. S. Volkov
Summary: There is a global trend towards miniaturization and multiwavelength performance of nanophotonic devices. Hexagonal boron nitride (hBN) is a promising material for future nanophotonics due to its inherent anisotropy and prospects of high-quality monocrystal growth with an atomically flat surface.
MATERIALS HORIZONS
(2023)
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)
