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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Electron–phonon coupling-assisted universal red luminescence of o-phenylenediamine-based carbon dots
Boyang Wang,Zhihong Wei,Laizhi Sui,Jing Yu Yu,Baowei Zhang,Xiaohong Wang,S Feng,Haoqiang Song,Xue Yong,Yu-Peng Tian,Bai Yang,Siyu Lu +11 more
TL;DR: In this article , the photoluminescence (PL) mechanism of carbon dots (CDs) remains unclear due to the complex core-shell structure and variety of surface functional groups.
Journal Article
Wafer-scale Two-dimensional Ferromagnetic Fe 3 GeTe 2 Thin Films Grown by Molecular Beam Epitaxy
TL;DR: In this article, the authors reported the wafer-scale growth of 2D ferromagnetic thin films of Fe3GeTe2 via molecular beam epitaxy, and their exotic magnetic properties can be manipulated via the Fe composition and the interface coupling with antiferromagnetic MnTe.
Journal ArticleDOI
Snapshots into carbon dots formation through a combined spectroscopic approach
Francesco Rigodanza,Max Burian,Francesca Arcudi,Francesca Arcudi,Luka Đorđević,Luka Đorđević,Heinz Amenitsch,Maurizio Prato,Maurizio Prato +8 more
TL;DR: In this paper, the formation of carbon nanodots with ad hoc properties has been investigated by tracking structural, chemical and photophysical features during the hydrothermal synthesis process, and it has been shown that the formation process consists of four consecutive steps: aggregation of small organic molecules, formation of a dense core with an extended shell, collapse of the shell and aromatization of the core.
Journal ArticleDOI
First-principles study of intrinsic phononic thermal transport in monolayer C 3 N
TL;DR: In this article, the intrinsic lattice thermal conductivity of carbon nitride C3N is investigated and compared with graphene, and the underlying mechanisms governing the thermal transport were thoroughly discussed and compared to graphene, including group velocities, phonon relax time, the contribution from phonon branches and size effect.
Journal ArticleDOI
Distinctive organized molecular assemble of MoS2, MOF and Co3O4, for efficient dye-sensitized photocatalytic H2 evolution
TL;DR: In this article, MoS2 and a metal organic framework (MOF) were combined to form a new structure catalyst MoS 2-MOF, which provided a large specific surface area and sufficient active sites, and greatly improved the electron transport efficiency.
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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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.