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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Fluorescent Carbon Dots: Fantastic Electroluminescent Materials for Light‐Emitting Diodes
Biao Zhao,Zhan'ao Tan +1 more
TL;DR: In this article, the state-of-the-art advances of CD-based electroluminescent LEDs are summarized, in which CDs act as active emission layer and interface transport layer materials.
Journal ArticleDOI
Monolayer and bilayer polyaniline C3N: two-dimensional semiconductors with high thermal conductivity
TL;DR: In this work, the thermal transport properties of one of the newly synthesized 2D PANI structures, C3N, are systematically investigated using classical molecular dynamics simulations to provide theoretical guidance to future applications of C 3N-based low-dimensional materials in electronic devices.
Journal ArticleDOI
Prediction of two-dimensional nodal-line semimetals in a carbon nitride covalent network
Haiyuan Chen,Haiyuan Chen,Shunhong Zhang,Shunhong Zhang,Wei Jiang,Chunxiao Zhang,Heng Guo,Zheng Liu,Zhiming Wang,Feng Liu,Xiaobin Niu +10 more
TL;DR: In this article, a new type of carbon nitride network with a C9N4 stoichiometry was predicted from first principles calculations, and the nodal line formed a closed ring centered at the Γ point which originates from the pz orbitals of both C and N.
Journal ArticleDOI
Green, Rapid, and Universal Preparation Approach of Graphene Quantum Dots under Ultraviolet Irradiation
Jinli Zhu,Yanfeng Tang,Gang Wang,Gang Wang,Mao Jiarong,Zhiduo Liu,Tongming Sun,Miao Wang,Da Chen,Yucheng Yang,Jipeng Li,Yuan Deng,Siwei Yang +12 more
TL;DR: A new green, rapid, and universal preparation approach for graphene quantum dots via the free-radical polymerization of oxygen-containing aromatic compounds under ultraviolet irradiation is introduced, which had a high yield (86%), and the byproducts are only H2O and CO2.
Journal ArticleDOI
Band Engineering of Carbon Nitride Monolayers by N-Type, P-Type, and Isoelectronic Doping for Photocatalytic Applications
TL;DR: The potential for doping with isoelectronic elements to greatly improve the photocatalytic characteristics of carbon nitride nanostructures is presented.
References
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Kostya S. Novoselov,Andre K. Geim,Sergey V. Morozov,Da Jiang,Y. Zhang,S. V. Dubonos,Irina V. Grigorieva,A. A. Firsov +7 more
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TL;DR: Owing to its unusual electronic spectrum, graphene has led to the emergence of a new paradigm of 'relativistic' condensed-matter physics, where quantum relativistic phenomena can now be mimicked and tested in table-top experiments.
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TL;DR: In this paper, the basic theoretical aspects of graphene, a one-atom-thick allotrope of carbon, with unusual two-dimensional Dirac-like electronic excitations, are discussed.
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A metal-free polymeric photocatalyst for hydrogen production from water under visible light
Xinchen Wang,Kazuhiko Maeda,Arne Thomas,Kazuhiro Takanabe,Gang Xin,Johan M. Carlsson,Kazunari Domen,Markus Antonietti +7 more
TL;DR: It is shown that an abundant material, polymeric carbon nitride, can produce hydrogen from water under visible-light irradiation in the presence of a sacrificial donor.
Journal ArticleDOI
Metal-free efficient photocatalyst for stable visible water splitting via a two-electron pathway
Juan Liu,Yang Liu,Naiyun Liu,Yuzhi Han,Xing Zhang,Hui Huang,Yeshayahu Lifshitz,Yeshayahu Lifshitz,Shuit-Tong Lee,Jun Zhong,Zhenhui Kang +10 more
TL;DR: The design and fabrication of a metal-free carbon nanodot–carbon nitride (C3N4) nanocomposite is reported and its impressive performance for photocatalytic solar water splitting is demonstrated.