Journal ArticleDOI
C3N—A 2D Crystalline, Hole-Free, Tunable-Narrow-Bandgap Semiconductor with Ferromagnetic Properties
Siwei Yang,Wei Li,Wei Li,Cai-Chao Ye,Gang Wang,He Tian,Chong Zhu,Peng He,Guqiao Ding,Xiaoming Xie,Xiaoming Xie,Yang Liu,Yeshayahu Lifshitz,Yeshayahu Lifshitz,Shuit-Tong Lee,Zhenhui Kang,Mianheng Jiang,Mianheng Jiang +17 more
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TLDR
Surprisingly, C3 N exhibits a ferromagnetic order at low temperatures (<96 K) when doped with hydrogen, which opens the door for both fundamental basic research and possible future applications.Abstract:
Graphene has initiated intensive research efforts on 2D crystalline materials due to its extraordinary set of properties and the resulting host of possible applications. Here the authors report on the controllable large-scale synthesis of C3 N, a 2D crystalline, hole-free extension of graphene, its structural characterization, and some of its unique properties. C3 N is fabricated by polymerization of 2,3-diaminophenazine. It consists of a 2D honeycomb lattice with a homogeneous distribution of nitrogen atoms, where both N and C atoms show a D6h -symmetry. C3 N is a semiconductor with an indirect bandgap of 0.39 eV that can be tuned to cover the entire visible range by fabrication of quantum dots with different diameters. Back-gated field-effect transistors made of single-layer C3 N display an on-off current ratio reaching 5.5 × 1010 . Surprisingly, C3 N exhibits a ferromagnetic order at low temperatures (<96 K) when doped with hydrogen. This new member of the graphene family opens the door for both fundamental basic research and possible future applications.read more
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Evolution and Synthesis of Carbon Dots: From Carbon Dots to Carbonized Polymer Dots
TL;DR: CPDs are revealed as an emerging class of CDs with distinctive polymer/carbon hybrid structures and properties, and critical insights into facilitating their potential in various application fields are proposed.
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Molecular engineering of polymeric carbon nitride: advancing applications from photocatalysis to biosensing and more
TL;DR: This review summarizes and highlights a panorama of the latest advancements related to the design and construction of the molecular structure of CN, such as by doping and copolymerization, engineering of the polymerization degree, coordination interaction, covalent and noncovalent functionalization, and modulation of intralayer hydrogen bonding.
Journal ArticleDOI
Interface-Assisted Synthesis of 2D Materials: Trend and Challenges
TL;DR: The state-of-the-art progress on interfacial synthesis strategies and address their advancements in the structural, morphological, and crystalline control by the direction of the arrangement of the molecules or precursors at a confined 2D space are summarized.
Journal ArticleDOI
The Computational 2D Materials Database: high-throughput modeling and discovery of atomically thin crystals
Sten Haastrup,Mikkel Strange,Mohnish Pandey,Thorsten Deilmann,Per Simmendefeldt Schmidt,N. F. Hinsche,Morten Niklas Gjerding,Daniele Torelli,Peter Mahler Larsen,Anders C. Riis-Jensen,Jakob Gath,Karsten Wedel Jacobsen,Jens Jørgen Mortensen,Thomas Olsen,Kristian Sommer Thygesen +14 more
TL;DR: The Computational 2D Materials Database (C2DB) as discussed by the authors is a large-scale database of 2D materials and van der Waals heterostructures, including tens of thousands of materials.
Journal ArticleDOI
Full-color fluorescent carbon quantum dots
Liang Wang,Liang Wang,Weitao Li,Luqiao Yin,Yijian Liu,Huazhang Guo,Jiawei Lai,Yu Han,Gao Li,Ming Li,Jianhua Zhang,Robert Vajtai,Pulickel M. Ajayan,Minghong Wu +13 more
TL;DR: The universal electron-donating/withdrawing group engineering approach for synthesizing tunable emissive CQDs will facilitate the progress of carbon-based luminescent materials for manufacturing forward-looking films and devices.
References
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A solid state NMR characterization of cross-linked polyaniline powder
TL;DR: In this article, a detailed structural characterization of annealed polyaniline (PANI) powder samples has been carried out by using solid state NMR (SSNMR) and FT-IR.
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Chemically Modulated Band Gap in Bilayer Graphene Memory Transistors with High On/Off Ratio
TL;DR: By utilizing the band-gap-opened bilayer graphene, excellent nonvolatile memory switching behavior was demonstrated with a clear program/erase state by applying pulse gate bias.
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A single-source route to bulk samples of C3N and the co-evolution of graphitic carbon microspheres
Timothy C. King,Peter D. Matthews,Juan P. Holgado,David A. Jefferson,Richard M. Lambert,Ali Alavi,Dominic S. Wright +6 more
TL;DR: In this paper, the thermolysis of commercially available m-phenylenediamine (1,3-(NH2)2C6H4) at 800 °C under a static vacuum in a sealed quartz tube provides the first bulk synthesis of C3N, whose properties have only been predicted theoretically previously Hollow carbon microspheres (CMSs) which do not contain significant nitrogen doping (1 − 3μm diameter) are co-produced in the reaction and readily separated from the C 3N flakes.
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The atomic structures of carbon nitride sheets for cathode oxygen reduction catalysis.
TL;DR: Using first principles calculations with a global optimization method, the results show that the larger the ratio, the more energetically favorable the obtained structures, and the more preferably for the C, N atoms to assume sp(2) configurations.