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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Ultralow lattice thermal conductivity in monolayer C3N as compared to graphene
TL;DR: Using density functional theory and the Boltzmann transport equation for phonons, the authors demonstrate that the thermal conductivity is massively reduced in monolayer C3N as compared to isostructural graphene.
Journal ArticleDOI
Photoluminescence mechanisms of red-emissive carbon dots derived from non-conjugated molecules.
Xin Yang,Lin Ai,Jing Yu Yu,Geoffrey I. N. Waterhouse,Laizhi Sui,Jie Ding,Baowei Zhang,Xue Yong,Siyu Lu +8 more
TL;DR: In this paper , the authors investigated the emission mechanism of red-emissive carbon dots (R-CDs) from non-aromatic precursors and determined the origin of red emission in CA-based CDs.
Journal ArticleDOI
First-Principles Study of Electrocatalytically Reversible CO2 Capture on Graphene-like C3N
TL;DR: It is demonstrated that the CO2 capture, regeneration and separation on C3 N monolayer can be controllable with the method of switching on/off the charge state or electric field during the adsorption.
Journal ArticleDOI
Progress and challenges in understanding of photoluminescence properties of carbon dots based on theoretical computations
Michal Langer,Markéta Paloncýová,Miroslav Medveď,Martin Pykal,Dana Nachtigallová,Baimei Shi,Adelia J. A. Aquino,Adelia J. A. Aquino,Hans Lischka,Hans Lischka,Michal Otyepka +10 more
TL;DR: In this paper, a review of state-of-the-art theoretical methods for the description of absorption and photoluminescence (PL) of CDs and their limitations, along with providing an overview of theoretical studies addressing structural models and the electronic structure of various types of CDs in the context of their overall optical properties.
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Graphene-like BC6N nanosheets are potential candidates for detection of volatile organic compounds (VOCs) in human breath: A DFT study
TL;DR: In this paper, the potential application of graphene-like borocarbonitride (BC6N) for high-performance volatile organic compound (VOC) sensors used for human breath analysis was investigated.
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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Journal ArticleDOI
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.