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
Jia-Wei Chen, Yun-Guan Wei, Hung-Yang Lo, Sicheng Lu, Yi-Che Chen, Chi-Fong Lei, Po-Liang Liu, Pu Yu, Nien-Ti Tsou, Akira Yasuhara, Wen-Wei Wu, Ying-Hao Chu
Summary: Quasi van der Waals epitaxy is a method to construct combinations of 2D and 3D materials. The interface structure and mechanical robustness of metal/muscovite systems have been studied. The anisotropic thermal expansion and thermal stress tolerance in the silver/muscovite heteroepitaxy have been discovered and demonstrated. The electrothermal and photothermal methods show fast response to thermal stress, proving the interface robustness.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Jason Lapano, Ondrej Dyck, Andrew R. Lupini, Wonhee Ko, Haoxiang Li, Hu Miao, Ho Nyung Lee, An-Ping Li, Matthew Brahlek, Stephen Jesse, Robert G. Moore
Summary: Research has shown that utilizing van der Waals epitaxial growth technique can achieve high-quality growth of layered topological insulators on freestanding monolayer graphene transferred to different mechanical supports, opening up new possibilities for creating device structures with traditional semiconductor nanofabrication techniques.
ACS APPLIED NANO MATERIALS
(2021)
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)
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
Chemistry, Multidisciplinary
Shuo Zhang, Bingyao Liu, Fang Ren, Yue Yin, Yunyu Wang, Zhaolong Chen, Bei Jiang, Bingzhi Liu, Zhetong Liu, Jingyu Sun, Meng Liang, Jianchang Yan, Tongbo Wei, Xiaoyan Yi, Junxi Wang, Jinmin Li, Peng Gao, Zhongfan Liu, Zhiqiang Liu
Summary: A new strain-modulated growth method is proposed to increase the indium composition in InGaN alloy, improving the efficiency of optoelectronic devices. The design of graphene interlayer and nanorod buffer layer effectively reduces stress, increases indium incorporation, and demonstrates the fabrication of small-sized cyan light-emitting diodes.
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
Hua Lv, Alessandra da Silva, Adriana I. Figueroa, Charles Guillemard, Ivan Fernandez Aguirre, Lorenzo Camosi, Lucia Aballe, Manuel Valvidares, Sergio O. Valenzuela, Juergen Schubert, Martin Schmidbauer, Jens Herfort, Michael Hanke, Achim Trampert, Roman Engel-Herbert, Manfred Ramsteiner, Joao Marcelo J. Lopes
Summary: Large-area growth of Fe5-xGeTe2/graphene heterostructures is achieved by vdW epitaxy of Fe5-xGeTe2 on epitaxial graphene. Magnetic and transport studies show that the ferromagnetic order remains above 300 K with perpendicular magnetic anisotropy. This represents an important advance in the practical implementation of ferromagnetic 2D materials.
Article
Nanoscience & Nanotechnology
Chung-Che Huang, He Wang, Yameng Cao, Ed Weatherby, Filipe Richheimer, Sebastian Wood, Shan Jiang, Daqing Wei, Yongkang Dong, Xiaosong Lu, Pengfei Wang, Tomas Polcar, Daniel W. Hewak
Summary: We have developed a fabrication process for uniform large-scale MoS2, WS2 monolayers, and their heterostructures using van der Waals epitaxy. The resulting materials have been successfully deposited on various substrates, and their band alignment and large-scale uniformity have been evaluated.
ACS APPLIED MATERIALS & INTERFACES
(2022)
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
Engineering, Electrical & Electronic
Yunfeng Chen, Yang Wang, Zhen Wang, Yue Gu, Yan Ye, Xuliang Chai, Jiafu Ye, Yan Chen, Runzhang Xie, Yi Zhou, Zhigao Hu, Qing Li, Lili Zhang, Fang Wang, Peng Wang, Jinshui Miao, Jianlu Wang, Xiaoshuang Chen, Wei Lu, Peng Zhou, Weida Hu
Summary: Band-engineered van der Waals heterostructures are able to construct high room-temperature detectivity detectors for visible light and blackbody infrared light by blocking dark current without suppressing photocurrent. Utilizing two-dimensional materials with self-passivated surfaces and tunable band structures, unipolar barriers can be designed to avoid lattice mismatch and interface defects, achieving low dark current and high detectivity in photodetectors.
NATURE ELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
Kenan Zhang, Changchun Ding, Baojun Pan, Zhen Wu, Austin Marga, Lijie Zhang, Hao Zeng, Shaoming Huang
Summary: This study investigates the growth mechanisms of 2D van der Waals heterostructures using a custom-built system and identifies a new growth mode with different rate and morphology. A model is proposed to explain the differences in morphologies and growth rates of the two modes. The findings from a range of material combinations may benefit the synthesis of other 2D heterostructures with controlled properties for future device applications.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Jie Yao, Han Wang, Bingkai Yuan, Zhenpeng Hu, Changzheng Wu, Aidi Zhao
Summary: In this study, the epitaxial growth of monolayer and bilayer CrTe3 on a graphite surface is demonstrated, and their structure, electronic, and magnetic properties are characterized and confirmed through various characterization techniques. The monolayer CrTe3 can be utilized to fabricate a lateral heterojunction consisting of ML CrTe2 and ML CrTe3, representing the first in-plane magnetic metal-semiconductor heterojunction made of two vdW materials. These findings are of great significance for the development of miniaturized antiferromagnetic spintronic devices based on vdW materials.
ADVANCED MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Yunah Lee, Yunyeong Chang, Huije Ryu, Jong Hun Kim, Kenji Watanabe, Takashi Taniguchi, Miyoung Kim, Gwan-Hyoung Lee
Summary: This study presents a new method for the epitaxial recrystallization of a gold thin film into single crystals through encapsulation annealing with hexagonal boron nitride (hBN). By using this method, a gold nanocrystal array with the same crystalline orientation and smooth top surface was also fabricated.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Stefan Kraus, Alexander Herman, Felix Huttmann, Marco Bianchi, Raluca-Maria Stan, Ann Julie Holt, Shigeru Tsukamoto, Nico Rothenbach, Katharina Ollefs, Jan Dreiser, Ken Bischof, Heiko Wende, Philip Hofmann, Nicolae Atodiresei, Thomas Michely
Summary: Sandwich-molecular wires consisting of europium and cyclooctatetraene were grown on a graphene template and their band structure and magnetic properties were investigated. The wires exhibit a unique band structure and an easy-axis magnetization along the wire direction.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Caio C. Silva, Daniela Dombrowski, Nicolae Atodiresei, Wouter Jolie, Ferdinand Farwick zum Hagen, Jiaqi Cai, Paul T. P. Ryan, Pardeep K. Thakur, Vasile Caciuc, Stefan Blugel, David A. Duncan, Thomas Michely, Tien-Lin Lee, Carsten Busse
Summary: The lattice mismatch between a monolayer of MoS2 and its Au(111) substrate induces a moire superstructure, leading to a spatial variation of electronic bands. Using a combination of experimental techniques and density functional theory, the geometric and electronic structure of the interface is determined with precision. The analysis identifies the fraction of interfacial atoms strongly interacting with the substrate and examines the variation of electronic structure in relation to the moire unit cell and band characteristics.
Article
Chemistry, Multidisciplinary
Wouter Jolie, Tzu-Chao Hung, Lorena Niggli, Benjamin Verlhac, Nadine Hauptmann, Daniel Wegner, Alexander Ako Khajetoorians
Summary: Artificial lattices created from assembled atoms on a surface using scanning tunneling microscopy can be used to create matter with customized electronic, magnetic, and topological properties. In this study, quantum corrals made from iron atoms on the Rashba surface alloy BiCu2 were created and characterized using low-temperature scanning tunneling microscopy and spectroscopy. Complex interference patterns were observed, resulting from the interplay of confinement potential size, multiband scattering, and underlying band structure hexagonal warping. These results provide insights into the creation of correlated artificial lattices with nontrivial topology by studying the coupling of quantum corrals and the effect of underlying warping.
Article
Chemistry, Physical
Tobias Hartl, Daniel Herrmann, Moritz Will, Yannic Falke, Alexander Grueneis, Thomas Michely, Pantelis Bampoulis
Summary: This article reports on the fabrication of stable silicon nanocluster arrays on a special surface. The cluster binding sites, electronic structure, and thermal stability were studied using scanning tunneling microscopy and spectroscopy. The findings show that the clusters have a size-dependent bandgap and are stable up to 577 K.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Elin Granaes, Ulrike A. Schroeder, Mohammad A. Arman, Mie Andersen, Timm Gerber, Karina Schulte, Jesper N. Andersen, Thomas Michely, Bjork Hammer, Jan Knudsen
Summary: This study investigates room temperature oxygen hydrogenation below graphene flakes supported by Ir(111). The research shows that the graphene cover and its doping level can be used to trap and characterize dense mixed O-OH-H2O phases. The response of these phases to oxygen or hydrogen exposure reveals that additional oxygen can be dissolved into them at room temperature, while additional hydrogen exposure converts the mixed O-OH-H2O phases back to pure OH-H2O.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Daniela Dombrowski, Abdus Samad, Kai Mehlich, Thais Chagas, Udo Schwingenschlogl, Carsten Busse
Summary: We prepare monolayers of tantalum sulfide on Au(111) through evaporating tantalum in the presence of H2S. Depending on the sulfur concentration, either 2H-TaS2 monolayers or TaS monolayers are formed. Using scanning tunneling microscopy and density functional theory calculations, we investigate the alignment of the layers with the substrate and the formation of heterostructures. We observe mirror twin boundaries within 2H-TaS2 along the S- and Ta-edge.
Article
Materials Science, Multidisciplinary
D. Ivekovic, P. Dubcek, A. Gajovic, T. Cizmar, B. Radatovic, A. L. Brkic, M. Kralj, M. Karlusic
Summary: In this study, we used atomic force microscopy, scanning tunnelling microscopy, and Raman spectroscopy to investigate the response of graphite to high-energy heavy ions irradiation. Ion tracks were observed on the surface after grazing incidence ion irradiation by 23 MeV I, indicating the susceptibility of the graphite surface to this type of irradiation. No tracks were found within the bulk after normal incidence irradiation. However, we demonstrate that electronic energy loss contributes to defect recovery, thus enhancing the stability of graphite below the surface to high-energy heavy ion irradiation.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Chemistry, Physical
Kai Mehlich, Abdus Samad, Catherine Grover, Daniela Dombrowski, Jiaqi Cai, Udo Schwingenschloegl, Carsten Busse, Thais Chagas
Summary: We studied the nucleation stage of epitaxial growth of monolayer TaS2 by using ultrahigh-vacuum conditions and Au(111) as the substrate. The atomic-scale protrusions with a well-defined triangular shape were identified as TaS3 using density functional theory. These protrusions act as nuclei for the growth of extended TaS2 monolayers with a unique orientation.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Polymer Science
Laura Nuic, Barbara Panic, Lovorka-Kristina Perekovic, Iva Srut Rakic, Marko Kralj, Ana Mihanovic, Hrvoj Vancik, Ivana Biljan
Summary: The possibility of on-surface intermolecular interactions and the formation of azodioxy polymer thin films were studied using ellipsometry, atomic force microscopy (AFM), and nanoscale Fourier transform infrared (nano-FTIR) spectroscopy. The results showed that the nitroso terminal groups can initiate the formation of azodioxy linkages with aromatic dinitroso derivatives, leading to the formation of azodioxy oligomer films. The thickness and topography analysis confirmed the presence of islands representing azodioxy oligomers on the surface.
Article
Anthropology
Sasa Kovacevic, Marina Van Bos, Marko Kralj, Marin Petrovic, Ozren Gamulin, Marko Skrabic, Sinisa Radovic, Ina Vanden Berghe
Summary: This study analyzes decorative artifacts made from bone or antlers from the Jalzabet region in Croatia. It reveals the deliberate use of black and red pigments in the decoration, with black pigment likely being carbon black and red pigment being hematite. These artifacts may have been used as inlays for furniture or other luxury items, as well as in clothing and jewelry.
INTERDISCIPLINARIA ARCHAEOLOGICA-NATURAL SCIENCES IN ARCHAEOLOGY
(2023)
Article
Chemistry, Physical
Thais Chagas, Kai Mehlich, Abdus Samad, Catherine Grover, Daniela Dombrowski, Jiaqi Cai, Udo Schwingenschlogl, Carsten Busse
Summary: We investigate the nucleation stage of monolayer TaS2 in epitaxial growth of monolayer transition-metal sulfides. By using scanning tunneling microscopy, we discover atomic-scale protrusions with a triangular shape that serve as nuclei for the further growth of extended TaS2 monolayers. These protrusions are identified as TaS3 using density functional theory. The unique orientation of these protrusions is proposed to cause the well-defined orientation of complete TaS2 layers under optimal growth conditions.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Review
Chemistry, Physical
Sk Md Obaidulla, Antonio Supina, Sherif Kamal, Yahya Khan, Marko Kralj
Summary: This review provides an overview of the current understanding and mechanisms of interlayer exciton emission and modulation in two-dimensional transition metal dichalcogenides (2D-TMDs) and organic hybrid heterostructures. It covers various device demonstrations, synthesis techniques, and challenges encountered in TMDO heterostructures. The review also discusses the recent advancements in optoelectronic synaptic devices based on 2D-TMDOs and organic materials.
NANOSCALE HORIZONS
(2023)
Article
Materials Science, Multidisciplinary
Philipp Valerius, Carsten Speckmann, Boris Senkovskiy, Alexander Gruneis, Nicolae Atodiresei, Thomas Michely
Summary: Patterns formed in monolayer graphene and hexagonal boron nitride under ion irradiation were investigated using scanning tunneling microscopy. Subnanometer pores with periodic distribution were created, and excess vacancies were expelled from the array. Successful delamination of a perforated graphene monolayer was achieved, providing a new material for membrane research.
Article
Chemistry, Multidisciplinary
Alexander Herman, Stefan Kraus, Shigeru Tsukamoto, Lea Spieker, Vasile Caciuc, Tobias Lojewski, Damian Guenzing, Jan Dreiser, Bernard Delley, Katharina Ollefs, Thomas Michely, Nicolae Atodiresei, Heiko Wende
Summary: From macroscopic heavy-duty permanent magnets to nanodevices, precise control of magnetic properties in rare-earth metals is crucial for various daily life applications. In this study, a proof-of-concept approach using a dysprosium-iridium surface alloy and graphene adsorption is presented, enabling the tailored manipulation of magnetic properties. By selectively lifting magnetic 4f-metal atoms from the surface alloy through the adsorption of graphene, a giant magnetic anisotropy in dysprosium atoms is introduced. The successful introduction and demonstration of this concept provide a clear understanding of its underlying mechanism and pave the way for an alternative approach to modify the crystal field around 4f-atoms and their magnetic anisotropies.