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
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
Chemistry, Multidisciplinary
Jie Li, Ruqian Wu
Summary: In this study, a van der Waals (vdW) heterostructure of ultrathin MnBi2Se4 and Bi2Se3 layers is proposed as an excellent tunable platform for the quantum anomalous Hall (QAH) effect. The band gap of this heterostructure closes and reopens as the applied electric field increases, exhibiting a novel topological phase transition. It also has other advantageous properties such as a large topological band gap, perpendicular magnetization, and strong ferromagnetic ordering.
Article
Materials Science, Multidisciplinary
Wouter Mortelmans, Stefan De Gendt, Marc Heyns, Clement Merckling
Summary: The application of new materials in nanotechnology, particularly 2D chalcogenides, holds promise for groundbreaking innovations in the semiconductor industry. However, the integration of these materials poses challenges, limiting their usage to research laboratories. Achieving epitaxial growth of large-area, single-crystalline 2D chalcogenides is crucial for meeting industry demands.
APPLIED MATERIALS TODAY
(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
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.
Article
Chemistry, Multidisciplinary
Eli Sutter, Raymond R. Unocic, Juan-Carlos Idrobo, Peter Sutter
Summary: Research demonstrates multilayer heterostructures of van der Waals semiconductors with lateral interfaces, featuring sharp and laterally localized interfaces, as well as showing evidence of rapid transfer of electron-hole pairs across interfaces.
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
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
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
Eli Sutter, Kim Kisslinger, Raymond R. Unocic, Kory Burns, Jordan Hachtel, Peter Sutter
Summary: In this study, complex multimaterial lateral heterostructures of van der Waals semiconductors were fabricated by sequentially growing different multilayer group IV chalcogenide crystals. The judicious placement of interfaces in these designer materials allows for the selection of photonic modes with discrete energies.
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
Chemistry, Multidisciplinary
Bitnuri Kwon, Hyeonhu Bae, Hoonkyung Lee, Seunghyun Kim, Jinhyun Hwang, Hyungsub Lim, Jung Hun Lee, Kilwon Cho, Jongpil Ye, Seungae Lee, Wi Hyoung Lee
Summary: Sensitive and selective detection of target gases is achieved using ultrasensitive n-channel graphene gas sensors doped with ethylene amines. The gas sensors demonstrate excellent response to oxidizing gases such as NO2, with a detection limit of 0.83 ppq. The sensors are fabricated on plastic without vertical stacks of gate-electrode and gate-dielectric, making them highly flexible and suitable for commercial use.
Article
Materials Science, Multidisciplinary
Junbeom Park, Ramesh Ghosh, Minho S. Song, Yunjae Hwang, Youngbin Tchoe, Rajendra Kumar Saroj, Asad Ali, Puspendu Guha, Bosung Kim, Sang-Woo Kim, Miyoung Kim, Gyu-Chul Yi
Summary: This study reports the fabrication of individually addressable, high-density, vertical zinc oxide nanotube pressure sensor arrays, and investigates their pressure/force response and spatial mapping. The results show significant pressure/force responses from small devices composed of ZnO nanotube arrays on graphene, and the achieved spatial resolution reaches 1058 dpi for Schottky diode-based force/pressure sensors. The flexibility and electrical robustness of the fabricated sensor arrays for high-resolution tactile imaging are also confirmed. This work opens important opportunities for the applications of 1D piezoelectric pressure/force sensor arrays in human-electronics interfaces, smart skin, and micro- and nanoelectromechanical systems.
NPG ASIA MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Anuj Kumar Singh, Kwangseok Ahn, Dongha Yoo, Seokje Lee, Asad Ali, Gyu-Chul Yi, Kunook Chung
Summary: In this study, we achieved van der Waals integration of micropatterned GaN LEDs onto foreign graphene films. The transferred LEDs showed reliable device performances and adhesive properties, allowing for wearability and homogeneous light emission under various bending conditions.
NPG ASIA MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Rajendra K. Saroj, Puspendu Guha, Sangmin Lee, Dongha Yoo, Eunsu Lee, Jamin Lee, Miyoung Kim, Gyu-Chul Yi
Summary: A study on the selective growth of hexagonal GaSe film on prepatterned graphene substrate and fabrication of photodetector array is presented. The growth behavior of GaSe and the performance of the fabricated GaSe-based photodetectors are investigated. The findings reveal the potential applications of GaSe in optoelectronic devices.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Physics, Applied
Shih-Po Chien, Yu-Chen Chang, Kristan Bryan Simbulan, Shantanu Saha, Yu-Fan Chiang, Rajendra K. Saroj, Gyu-Chul Yi, Shamsul Arafin, Ting-Hua Lu, Yann-Wen Lan
Summary: This study investigates the effects of polarized light on the optical properties of h-BN phonon modes using polarized Raman spectroscopy. The polarization-resolved Raman spectra reveal the symmetrical and broken symmetry nature of degenerate phonon modes induced by linearly and elliptically polarized light, respectively. Furthermore, a helicity exchange is observed between circularly polarized excitation and the resulting opposite circular polarization of scattered light from h-BN.
APPLIED PHYSICS LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Hyeong-Yong Hwang, Hyeonjun Baek, Gyu-Chul Yi, Young-Dahl Jho
Summary: Strain occurs spontaneously at the interfaces of crystalline materials and needs a suitable characterization scheme to analyze multiple interfaces. Through the experiment, we found that surface strain has a stronger influence on photoluminescence spectra than quantum confinement effect. Particularly in the strongly tapered region, increasing surface strain leads to a significant increase in photoluminescence shift, which matches the analysis based on surface to volume ratio. Additionally, surface strain dependence on temperature contrasts with the temperature-invariant characteristics of quantum confinement.
Article
Chemistry, Physical
Joohee Kim, Heeyoung Kim, Jongdeok Kim, Hyeonhu Bae, Amit Singh, Tanveer Hussain, Hoonkyung Lee
Summary: We used first-principles calculations to study the hydrogen storage properties of bare and calcium-decorated polygon-graphenes. Both biphenylene and psi-graphene bind H-2 weakly in their pristine forms, but upon Ca doping, they can adsorb multiple H-2 molecules. The H-2 binding energy is around 0.30 eV, enabling reversible room-temperature storage with a capacity of up to 6.8 and 4.2 wt% for Ca-decorated biphenylene and psi-graphene respectively. These findings highlight the potential of Ca-decorated 2D carbon sheets as promising H-2 storage materials.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Joohee Kim, Seunghan Lee, Amit Singh, Minwoo Park, Hyeonhu Bae, Li Yang, Hoonkyung Lee
Summary: This paragraph discusses the reason for the zero electric field inside a classical conductor in electrostatics, and introduces the role of metallic thin-layered molybdenum disulfide and functionalized molybdenum disulfide in dielectric screening, as well as the effect of functionalization on their dielectric constants.
ACS APPLIED NANO MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Hakkim Vovusha, Hyeonhu Bae, Seunghan Lee, Jusang Park, Ali Raza, Komsilp Kotmool, Tanveer Hussain, Hoonkyung Lee
Summary: In this study, density functional theory calculations were used to investigate the sensing properties of MXene monolayers towards volatile organic compounds (VOCs) associated with meat and fish spoilage. The researchers found that appropriate binding of these VOCs can induce measurable changes in the electronic properties of MXene monolayers, leading to a highly efficient sensing mechanism. Specifically, Nb2C(OH)(2) exhibited excellent sensing capabilities towards DMA and TMA, while Nb2CF2 selectively adsorbed MA.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Physical
S. Singsen, N. Thasami, P. Tangpakonsab, H. Bae, H. Lee, T. Hussain, T. Kaewmaraya
Summary: This study investigates the sensing capabilities of Graphdiyne (GDY) and transition metal-decorated GDY for detecting arsine and phosphide gases. Fe-doped GDY is found to be highly selective and sensitive in detecting AsH3 and PH3, with promising potential for applications.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Dayanand Kumar, Saransh Shrivastava, Aftab Saleem, Amit Singh, Hoonkyung Lee, Yeong-Her Wang, Tseung-Yuen Tseng
Summary: In this research, we successfully simulated the functions of the human brain for neuromorphic computing and image sensing applications by fabricating an invisible memristor based on ZTO. The device exhibits stable performance and can accurately identify images.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
