Review
Chemistry, Multidisciplinary
Yanping Liu, Cheng Zeng, Juan Yu, Jiahong Zhong, Bo Li, Zhengwei Zhang, Zongwen Liu, Zhiming M. Wang, Anlian Pan, Xidong Duan
Summary: Recent advances in moire superlattices and moire excitons have attracted attention in optoelectronics and materials research. However, lagging theoretical development and inefficient processing technologies limit their potential applications. Continued research is likely to lead to breakthroughs and innovations in solid-state physics and materials science.
CHEMICAL SOCIETY REVIEWS
(2021)
Review
Chemistry, Multidisciplinary
Jia Li, Jingyi Liang, Xiangdong Yang, Xin Li, Bei Zhao, Bo Li, Xidong Duan
Summary: 2D van der Waals heterostructures (vdWHs) and superlattices (SLs) have attracted significant interest due to their exotic physical properties and potential applications in new devices. The dangling-bond-free surface of 2D layered materials allows for the integration of different materials to produce vdWHs without the need for lattice matching and processing compatibility. However, ensuring high-quality interfaces and scalability remains challenging. Bottom-up methods provide controllability and flexibility, with growth parameters such as temperature, precursors, substrate, and carrier gas being carefully controlled to produce high-quality interfaces and wafer-scale products of vdWHs/vdWSLs. This review focuses on three bottom-up methods: chemical/physical vapor deposition, metal-organic chemical vapor deposition, and ultrahigh vacuum growth, highlighting their flexibility and controllability for the preparation of vdWHs/vdWSLs. The review also summarizes the latest progress in vdWHs and vdWSLs, related physical phenomena, and (opto)electronic devices, and discusses current challenges and future perspectives in the synthesis and application of these structures.
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
Chemistry, Multidisciplinary
Wenxiang Wang, Jiyou Jin, Yanrong Wang, Zheng Wei, Yushi Xu, Zhisheng Peng, Hui Liu, Yu Wang, Jiawang You, Julienne Impundu, Qiang Zheng, Yong Jun Li, Lianfeng Sun
Summary: A floating-gate memory based on van der Waals heterostructure is utilized, demonstrating a large storage window ratio (>75.5%), an extremely high on/off ratio (10^7), and an ultrafast electrical writing/erasing speed (40 ns). These enhanced performance characteristics enable excellent multilevel data storage, robust retention, and endurance performance. Stable optical erasing operations can also be achieved by illuminating the device with a laser pulse, showcasing outstanding optoelectronic storage performance (optical erasing speed >2.3 ms). The nonvolatile and high-speed characteristics of these devices hold significant potential for the integration of high-performance nonvolatile memory.
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.
Review
Chemistry, Multidisciplinary
Sofie Cambre, Ming Liu, Dmitry Levshov, Keigo Otsuka, Shigeo Maruyama, Rong Xiang
Summary: 1D van der Waals heterostructures based on carbon nanotube templates offer exciting possibilities for creating new optical and electronic properties. By engineering the characteristics of these heterostructures through controlling their diameter and chiral structure, they can be integrated into a wide range of applications with custom-built properties.
Review
Chemistry, Physical
Jiaojiao Ma, Kaiwen Guan, Yu Jiang, Yang Cao, Sheng Hu
Summary: Research on two-dimensional materials has provided insights into the low-dimensional science and the investigation of physical and chemical processes under two-dimensional confinement. The discoveries in this field have expanded our understanding of nano-science and stimulated the development of potential applications.
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
Gaokuo Zhong, Qianxin Chen, Yuan Zhang, Ke Qu, Zhenzhong Yang, Jinbin Wang, Xiangli Zhong, Ming Ma, Chuanlai Ren, Jiangyu Li
Summary: A new strategy is developed to prepare oxide dielectric materials on ultrathin and flexible mica substrates using van der Waals epitaxy. The resulting ultrathin flexible capacitor has a record high energy density of 12.19 J cm(-3) and an efficiency of 90.98%. The superlattice structure can be easily rolled for large-scale manufacturing, and the energy storage performances are well maintained even under large bending deformation and extended bending cycling.
ADVANCED FUNCTIONAL 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
Huanhuan Shi, Mengmeng Li, Shuai Fu, Christof Neumann, Xiaodong Li, Wenhui Niu, Yunji Lee, Mischa Bonn, Hai I. I. Wang, Andrey Turchanin, Ali Shaygan Nia, Sheng Yang, Xinliang Feng
Summary: Two-dimensional van der Waals heterostructures (2D vdWHs) have attracted widespread attention for their abundant and exotic properties, offering new possibilities for next-generation nanoelectronics. However, the lack of high-throughput fabrication techniques poses challenges for practical applications. In this study, a general electrochemical strategy is demonstrated to prepare high-quality vdWHs with electrostatic forces driving the stacking of individual assemblies, resulting in strong interlayer interactions. Thin-film photodetectors based on graphene/In2Se3 vdWHs show great promise for near-infrared photodetection, with high responsivity, fast rise and decay times. This approach enables the exploration of emerging electronic, photonic, and quantum phenomena.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
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, Physical
Ruihan Yang, Shafqat Ullah, Xiao Chen, Junxiang Ma, Yuan Gao, Yujun Wang, Guangsheng Luo
Summary: This study investigates the selective adsorption behavior and interaction mechanism of liquid alpha-olefin/paraffin on Mg metal-organic framework (MOF)-74 through a combination of experimental and simulation methods. The results show that Mg-MOF-74 exhibits high adsorption capacities for C-6 and C-8 linear alpha-olefins and provides insights into the arrangement and preferential adsorption sites of the adsorbates. The differences in adsorption energy between alpha-olefin/paraffin and Mg-MOF-74 are further explored through charge transfer analysis and quantification of interaction contributions.
Article
Chemistry, Multidisciplinary
Bailing Li, Hongmei Zhang, Quanyang Tao, Xiaohua Shen, Ziwei Huang, Kun He, Chen Yi, Xu Li, Liqiang Zhang, Zucheng Zhang, Jialing Liu, Jingmei Tang, Yucheng Zhou, Di Wang, Xiangdong Yang, Bei Zhao, Ruixia Wu, Jia Li, Bo Li, Xidong Duan
Summary: By investigating the electromagnetic transport properties of 2D thickness-controlled and high-quality Cr5Si3 nanosheets, it is found that the noncollinear magnetic structure leads to a significant topological Hall effect. The Cr5Si3 nanosheets exhibit thickness-dependent perpendicular magnetic anisotropy, and the topological Hall effect only occurs in a specific thickness range with moderate perpendicular magnetic anisotropy. This study provides opportunities for exploring fundamental spin-related physical mechanisms of noncollinear antiferromagnet in the ultrathin limit.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Ruihan Yang, Fangyu Zhao, Shafqat Ullah, Xiao Chen, Junxiang Ma, Yuan Gao, Yujun Wang, Guangsheng Luo
Summary: This study proposes a quantitative description of the adsorption cavity structure for the separation of long-chain alpha-olefin/paraffin and reveals the general cavity structural characteristics of microporous materials with good separation performance. The selective adsorption of C-6 and C-8 linear alpha-olefins on CuBTC was studied in detail, and the influence of the cavity structure on the adsorption and interaction was revealed. The research provides a new understanding of the long-chain hydrocarbon adsorption behavior and guides the design of adsorbents for alpha-olefin/paraffin separation.
Article
Nanoscience & Nanotechnology
Qi Qian, Zhong Wan, Hiroyuki Takenaka, Jong K. Keum, Tyler J. Smart, Laiyuan Wang, Peiqi Wang, Jingyuan Zhou, Huaying Ren, Dong Xu, Yu Huang, Yuan Ping, Xiangfeng Duan
Summary: A van der Waals contact approach is used to observe photocarrier-induced persistent structural polarization in lead halide perovskites. The study reveals the presence of persistent photoconductance and local ferroelectricity in thin-film single-crystal CsPbBr3 at low temperatures. Theoretical investigations highlight the role of photocarrier-phonon coupling and large polaron formation in driving the local relaxor ferroelectric phase transition.
NATURE NANOTECHNOLOGY
(2023)
Article
Chemistry, Analytical
Zhaoyuan Lyu, Shichao Ding, Lingzhe Fang, Xin Li, Tao Li, Mingjie Xu, Xiaoqing Pan, Wenlei Zhu, Yang Zhou, Dan Du, Yuehe Lin
Summary: In this study, a two-dimensional Fe-N-C-based single-atomic-site catalyst (2D Fe-SASC) with excellent peroxidase-like activity was successfully synthesized and used to design ELISA for herbicide detection. The 2D structure of Fe-SASC exposes numerous single atomic active sites on the surface, enhancing the sensing performance. The assembled 2D Fe-SASC into a competitive ELISA kit achieved excellent detection performance for 2,4-dichlorophenoxyacetic acid (2,4-D). Fe-SASC shows great potential to replace expensive natural enzymes and work on various advanced sensing platforms for the detection of different target biomarkers.
ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Physical
Yucheng Zhou, Bo Li, Lei Wang, Jingyuan Zhou, Kun He, Wei Li, Jia Li, Xiaodong Hu, Yuan Liu, Lei Liao, Xidong Duan
Summary: In this study, we synthesized n- and p-type graphene superlattices, named Gr/TBA and Gr/Ac, through the electrochemical intercalation of organic tetrabutyl ammonium and acetate. The crystal structure characterization revealed that the interlayer spacing of Gr/TBA and Gr/Ac was larger than that of pristine graphene. Hall effect measurements showed n-type and p-type conductive behaviors for Gr/TBA and Gr/Ac, respectively. The intercalated organic molecules effectively tuned the carrier concentrations and mobility, indicating electron transfer as the regulating mechanism for the electronic properties of graphene.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Huaixun Huyan, Zhe Wang, Linze Li, Xingxu Yan, Yi Zhang, Colin Heikes, Darrell G. Schlom, Ruqian Wu, Xiaoqing Pan
Summary: Defect engineering in perovskite thin films has received extensive attention due to their atomic-level modification and the design of novel nanostructures. However, three-dimensional defect-assisted nanostructures in thin film matrices usually have large misfit strains and unstable structures. In contrast, one- or two-dimensional defect-assisted nanostructures embedded in thin films can sustain large misfit strains without relaxation, making them suitable for defect engineering in perovskite thin films.
Article
Nanoscience & Nanotechnology
Xiangdong Yang, Jia Li, Rong Song, Bei Zhao, Jingmei Tang, Lingan Kong, Hao Huang, Zhengwei Zhang, Lei Liao, Yuan Liu, Xiangfeng Duan, Xidong Duan
Summary: This article presents a highly efficient van der Waals integration method for wafer-scale integration of high-performance 2D semiconductors. The method utilizes a quartz/polydimethylsiloxane semirigid stamp and a standard photolithography mask-aligner to ensure a uniform force and a bubble-free wrinkle-free interface during the pickup/release process, enabling reliable van der Waals integration. This scalable integration approach allows for damage-free integration of high-quality contacts and the fabrication of high-performance 2D transistors.
NATURE NANOTECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Huiqiu Wang, Xiao Chen, Hao Xiong, Chaojie Cui, Weizhong Qian, Fei Wei
Summary: This study atomically resolved the interaction between single thiophene probes and acid T-sites, revealing their bonding behaviors. Through direct atomic observations, the single Al T-sites in zeolites were precisely located, and it was found that different sites have different bonding probabilities. This study reveals the significance of the interaction between single guest molecules and active sites.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Likuan Ma, Quanyang Tao, Yang Chen, Zheyi Lu, Liting Liu, Zhiwei Li, Donglin Lu, Yiliu Wang, Lei Liao, Yuan Liu
Summary: This study reports an approach to suppress the off-state tunneling current in vertical transistors by designing the barrier height through van der Waals metal contact. By laminating a Pt electrode on a MoS2 vertical transistor, a high Schottky barrier is observed, effectively suppressing direct tunneling currents. The study not only achieves high on/off ratios in vertical transistors but also provides a general rule for reducing short-channel effects in ultrascaled devices.
Article
Chemistry, Multidisciplinary
Jaeha Lee, Peter Tieu, Jordan Finzel, Wenjie Zang, Xingxu Yan, George Graham, Xiaoqing Pan, Phillip Christopher
Summary: The addition of platinum-group metals (PGMs, e.g., Pt) to CeO2 promotes the rate of redox surface reactions in heterogeneous catalysis. However, the mechanistic picture of PGM-promoted H-2 reactions on CeO2 surfaces in powder catalysts remains unclear. This study investigates the influence of Pt nanoclusters and single atoms on H-2 reactions on Pt/CeO2 powder catalysts using controlled catalyst synthesis and various experimental techniques. The results show that Pt can promote H-2 consumption rates even when existing on a small fraction of CeO2 particles, and Pt changes the activation mechanism and rate limiting step for H-2 on CeO2 surfaces.
Article
Chemistry, Multidisciplinary
Xiaoliang Yan, Min Cao, Sha Li, Paul N. Duchesne, Wei Sun, Chenliang Mao, Rui Song, Zhe Lu, Xiao Chen, Weizhong Qian, Ruifeng Li, Lu Wang, Geoffrey A. Ozin
Summary: Researchers have synthesized a novel bimetallic heterogeneous catalyst and discovered its excellent catalytic performance and selectivity for carbon dioxide methanation through in situ analysis.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Le Gao, Lin Qin, Bo Wang, Mingdong Bao, Yingwen Cao, Xidong Duan, Weiyou Yang, Xiangdong Yang, Qing Shi
Summary: By fabricating submicron-thick zincophilic CrN coatings, long lifespan and high Coulombic efficiency have been achieved in Zn-ion batteries (ZIBs), with effective suppression of dendrite formation and parasitic reactions, as well as uniform zinc deposition.
Article
Engineering, Electrical & Electronic
Wanying Li, Quanyang Tao, Zhiwei Li, Guanhua Yang, Zheyi Lu, Yang Chen, Yao Wen, Yiliu Wang, Lei Liao, Yuan Liu, Jun He
Summary: Two-dimensional (2D) semiconductors, such as black phosphorus and germanium arsenide, can be fabricated into monolayer transistors with three-dimensional raised contacts using van der Waals peeling technique. The channel region of a multilayer black phosphorus transistor can be reduced to a monolayer thickness without degrading its lattice structure. However, the carrier mobility of black phosphorus drops sharply when reducing body thickness, behaving more like a conventional bulk semiconductor.
NATURE ELECTRONICS
(2023)