Editorial Cite This: Chem. Rev. 2018, 118, 6089−6090
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Introduction: 2D Materials Chemistry
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and defects. Then the CVD growth of wafer-scale continuous 2D material films on rigid and flexible substrates is overviewed. Besides, the CVD growth of 2D material-based heterostructures including vertical, lateral, and other dimension/2D heterostructures is elaborated. Finally, various applications and challenges related to the CVD-grown 2D materials and their heterostructures are discussed. Lain-Jong Li and co-workers (DOI: 10.1021/acs.chemrev.7b00212) provide a review over the preparation of 2D TMDs and their heterostructures by the CVD growth method, highlighting its capability to produce high-quality TMD layers with scalable size, controllable thickness, and excellent electronic properties. To emphasize, they thoroughly explain the growth mechanisms of TMDs, thus providing guidelines for precise control over their structures and properties by the CVD method. Jinwoo Cheon and co-workers (DOI: 10.1021/acs.chemrev.8b00264) review recent advances in the solution-based preparation of 2D layered TMDs. They highlight the advantages of the solution-based synthetic strategies, such as controllability over size and composition at the molecular level, scalability, competitive production cost, and solution processability. Xinliang Feng and co-workers (DOI: 10.1021/acs.chemrev.8b00056) focus on the utilization of an interface-assisted synthetic approach to prepare inorganic and organic 2D materials. They emphasize the advantages and uniqueness of the interfacial synthetic methods, especially highlighting their controllability over the structures, morphologies, and crystal phases via directing the arrangement of the molecules or precursors at a confined 2D space. Further, different interfacial synthetic strategies and the as-prepared inorganic and organic 2D materials are summarized, along with some recommended characterization techniques for better understanding their growth mechanisms. Lei Fu and co-workers (DOI: 10.1021/acs.chemrev.7b00633) review recent advances of 2D materials in terms of their monomer design and assembly control. They categorize different types of 2D materials and highlight various physical and chemical strategies to design their monomers with control over their dimensions, compositions, and structures. Furthermore, they highlight diverse assembly strategies of these 2D materials monomers into mass or ordered heterostructures. The applications of these 2D materials in next-generation electronics are overviewed as well. Young Hee Lee and co-workers (DOI: 10.1021/acs.chemrev.7b00618) present works related to van der Waals layered TMDs. They especially focus on different structural phases of layered TMDs, including metallic and semiconducting TMDs. Diverse phase transformation strategies and the dependence of electronic structures on different phases are discussed. Furthermore, various synthetic methods with capability of
he topic of this thematic issue is two-dimensional (2D) materials. The field has exploded since 2004, when graphene was successfully prepared from graphite by mechanical exfoliation with Scotch tape by Novoselov, Geim, and co-workers. In the subsequent decade-and-a-half the scientific community has shown great enthusiasm for studying graphene and graphene-analogous 2D materials, including the transition metal dichalcogenides (TMDs), graphitic carbon nitride (g-C3N4), hexagonal boron nitride (h-BN), black phosphorus (BP), MXenes, silicene, etc. Their fascinating physical, electronic, optical, and chemical properties as well as the promise of new applications arising from these properties have enchanted researchers from diverse fields such as condensed matter physics, materials science, chemistry, and nanotechnology. For example, the electron confinement in two dimensions confers 2D materials with intriguing electronic properties, which has stimulated the development of nextgeneration electronic devices. In addition, the large specific surface area of 2D materials motivates their use in surface-active applications, such as catalysis and sensing. Furthermore, their atomic thickness and high anisotropy endow 2D materials with excellent mechanical flexibility and optical transparency, which provide great opportunities for developing 2D material-based (opto-)electronic devices and wearable devices. In addition, disparate 2D materials can be assembled to form heterostructures without the constraints of lattice matching and processing compatibility, offering synergistic effects which benefit a wide spectrum of applications. Despite the exciting achievements in the field of 2D materials, challenges still exist. Large-scale production of 2D materials with high quality and controlled structure has yet to be realized for ultimate industrialization. Furthermore, obtaining precise control over their compositions, thicknesses, lateral sizes, crystal phases, doping, defects, strains, vacancies, and surface properties is of paramount importance to unveil the correlation between their structural features and properties. In addition, inspired by the significant progress in layered 2D materials, other types of nanomaterials with two dimensionality are believed to exhibit fascinating properties, such as 2D metal nanomaterials and 2D perovskites, which deserve more research focus. With the current achievements and the nonstop efforts from various research fields, it seems inevitable that we will reach the major milestone when the commercialization of 2D materials in our daily life is finally realized. Targeting at these goals, this themed issue attempts to present recent progress in studies related to 2D materials, covering a wide array of topics. The following reviews are published in this themed issue. Hui-Ming Cheng and co-workers (DOI: 10.1021/acs.chemrev.7b00536) present recent achievements and challenges related to the chemical vapor deposition (CVD) growth method. Specifically, they review three categories of materials prepared by the CVD method. They first summarize the CVD growth of single-crystal 2D materials with control over their grain sizes, layer, orientation, morphologies, phases, doping, © 2018 American Chemical Society
Special Issue: 2D Materials Chemistry Published: July 11, 2018 6089
DOI: 10.1021/acs.chemrev.8b00278 Chem. Rev. 2018, 118, 6089−6090
Chemical Reviews
Editorial
producing high-quality wafer-scale materials are overviewed. To emphasize, several fascinating features of metallic 2D TMDs are elaborated in detail, including periodic lattice distortions, magnetoresistance, superconductivity, magnetism, and Weyl semimetals. Shi-Zhang Qiao and co-workers (DOI: 10.1021/acs.chemrev.7b00689) comprehensively review the applications of 2D nanomaterials in electrocatalysis. They categorize abundant 2D electrocatalysts based on their compositions and functions and highlight their uniqueness as electrocatalysts. They also provide a thorough summary of various 2D electrocatalysts employed for different electrocatalytic processes including water cycle, carbon cycle, and nitrogen cycle. Importantly, they emphasize several catalyst design strategies (e.g., heteroatom doping, stain, and phase engineering), and the influence imposed by these strategies on the intrinsic material performance (e.g., electronic properties, absorption energies). Furthermore, they also describe the fundamental relationships between electronic structure, adsorption energy, and apparent activity of 2D electrocatalysts, offering an excellent guideline for designing 2D material-based electrocatalysts with high activity, selectivity, and stability. Hua Zhang and co-workers (DOI: 10.1021/acs.chemrev.7b00727) provide a comprehensive review of 2D metal nanomaterials. Different from 2D layered materials, 2D metals normally are constructed by nondirectional metallic bonds and exhibit nonlayered structures. Nevertheless, 2D metal nanomaterials are believed to possess intriguing properties compared to their counterparts in other dimensionalities due to the 2D quantum confinement effect. Various synthetic strategies including bottom-up and top-down methods are summarized. To highlight, the unique physical and chemical properties of 2D metal nanomaterials are discussed. Furthermore, the applications of these 2D metal nanomaterials in diverse fields are reviewed, such as catalysis, surface enhanced Raman scattering and photothermal therapy. In summary, this themed issue aims to provide the recent state-of-the-art progress in the field of 2D materials. I strongly believe that the compilation of these excellent review articles covering broad topics related to 2D materials could benefit researchers in diverse fields. Toward this end, I would like to express my sincere gratitude toward the authors for their great contributions to this themed issue and the editorial staff members of Chemical Reviews for their strong support.
Leuven (Belgium) in 1999 and then moved to Prof. Chad A. Mirkin’s group at Northwestern University in 2001. After he worked at NanoInk Inc. (USA) and Institute of Bioengineering and Nanotechnology (Singapore), he joined Nanyang Technological University in July 2006. His current research interests focus on the phase engineering of nanomaterials and controlled epitaxial growth of heterostructures, including the synthesis of ultrathin 2D nanomaterials (e.g., metal nanosheets, graphene, metal dichalcogenides, metal− organic frameworks, covalent organic frameworks, etc.), novel metallic and semiconducting nanomaterials, and their hybrid composites, for applications in catalysis, clean energy, (opto-)electronic devices, nanoand biosensors, water remediation, etc.
Hua Zhang*
Nanyang Technological University
AUTHOR INFORMATION Corresponding Author
*E-mail:
[email protected]. ORCID
Hua Zhang: 0000-0001-9518-740X Notes
Views expressed in this editorial are those of the author and not necessarily the views of the ACS. Biography Hua Zhang obtained his B.S. and M.S. degrees at Nanjing University in 1992 and 1995, respectively, and completed his Ph.D. with Prof. Zhongfan Liu at Peking University in 1998. As a Postdoctoral Fellow, he joined Prof. Frans C. De Schryver’s group at Katholieke Universiteit 6090
DOI: 10.1021/acs.chemrev.8b00278 Chem. Rev. 2018, 118, 6089−6090
