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Electrically-driven ultrafast out-of-equilibrium light emission from hot electrons in suspended graphene/hBN heterostructures

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International Journal of Extreme Manufacturing 2024年第1期6卷 328-338页

作者： Qiang Liu Wei Xu Xiaoxi Li Tongyao Zhang Chengbing Qin Fang Luo Zhihong Zhu shiqiao Qin Mengjian Zhu kostya s novoselov College of Advanced Interdisciplinary studies&Hunan Provincial Key Laboratory of Novel Nano-optoelectronic Information Materials and Devices National University of Defense TechnologyChangshaHunan 410073People’s Republic of China Nanhu Laser Laboratory National University of Defense TechnologyChangshaHunan 410073People’s Republic of China state Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006People’s Republic of China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006People’s Republic of China state Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006People’s Republic of China Institute for Functional Intelligent Materials National University of SingaporeSingapore 117544Singapore Department of Materials science and Engineering National University of SingaporeSingapore 117575Singapore

Nanoscale light sources with high speed of electrical modulation and low energy consumption are key components for nanophotonics and *** record-high carrier mobility and ultrafast carrier dynamics of graphene make it promising as an atomically thin light emitter which can be further integrated into arbitrary platforms by van der Waals ***,due to the zero bandgap,graphene is difficult to emit light through the interband recombination of carriers like conventional ***,we demonstrate ultrafast thermal light emitters based on suspended graphene/hexagonal boron nitride(Gr/hBN)*** in biased graphene are significantly heated up to 2800 K at modest electric fields,emitting bright photons from the near-infrared to the visible spectral *** eliminating the heat dissipation channel of the substrate,the radiation efficiency of the suspended Gr/hBN device is about two orders of magnitude greater than that of graphene devices supported on siO2or *** demonstrate that hot electrons and low-energy acoustic phonons in graphene are weakly coupled to each other and are not in full thermal *** cooling ofhigh-temperature hot electrons to low-temperature acoustic phonons is enabled by the significant near-field heat transfer at the highly localized Gr/hBN interface,resulting in ultrafast thermal emission with up to 1 GHz bandwidth under electrical *** is found thatsuspending the Gr/hBN heterostructures on the siO2trenches significantly modifies the light emission due to the formation of the optical cavity and showed a~440%enhancement inintensity at the peak wavelength of 940 nm compared to the black-body thermal *** demonstration of electrically driven ultrafast light emission from suspended Gr/hBNheterostructures sheds the light on applications of graphene heterostructures in photonicintegrated circuits,such as broadband light sources and ultrafast thermo-optic phase modulat

关键词： suspended graphene ultrafast light emitter van der Waals heterostructures thermal radiation electron–phonon interaction

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Exploring van der Waals materials with high anisotropy:geometrical and optical approaches

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Light(science & Applications) 2024年第4期13卷 645-653页

作者： Aleksandr s.slavich Georgy A.Ermolaev Mikhail K.Tatmyshevskiy Adilet N.Toksumakov Olga G.Matveeva Dmitriy V.Grudinin Kirill V.Voronin Arslan Mazitov Konstantin V.Kravtsov Alexander V.syuy Dmitry M.Tsymbarenko Mikhail s.Mironov sergey M.Novikov Ivan Kruglov Davit A.Ghazaryan Andrey A.Vyshnevyy Aleksey V.Arsenin Valentyn s.Volkov kostya s.novoselov Moscow Center for Advanced studies Kulakova str.20Moscow 123592Russia. Emerging Technologies Research Center XPANCEOInternet CityEmmay TowerDubaiUnited Arab Emirates. Donostia International Physics Center(DIPC) Donostia/San-Sebastián 20018Spain. Institute of Materials Ecole Polytechnique Federale de Lausanne1015 LausanneSwitzerland. Department of Chemistry Lomonosov Moscow State UniversityMoscow 119991Russia. Laboratory of Advanced Functional Materials Yerevan State UniversityYerevan 0025Armenia. National Graphene Institute(NGI) University of ManchesterManchester M139PLUK. Department of Materials science and Engineering National University of SingaporeSingapore 03-09 EASingapore. Institute for Functional Intelligent Materials National University of Singapore117544 SingaporeSingapore

The emergence of van der Waals(vdW)materials resulted in the discovery of their high optical,mechanical,and electronic anisotropic properties,immediately enabling countless novel phenomena and *** success inspired an intensive search for the highest possible anisotropic properties among vdW ***,the identification of the most promising among the huge family of vdW materials is a challenging quest requiring innovative ***,we suggest an easy-to-use method for such a survey based on the crystallographic geometrical perspective of vdW materials followed by their optical *** our approach,we found As2s3 as a highly anisotropic vdW *** demonstrates high in-plane optical anisotropy that is~20%larger than for rutile and over two times as large as calcite,high refractive index,and transparency in the visible range,overcoming the century-long record set by *** these benefits,As2s3 opens a pathway towards nextgeneration nanophotonics as demonstrated by an ultrathin true zero-order quarter-wave plate that combines classical and the Fabry–Pérot optical phase ***,our approach provides an effective and easy-to-use method to find vdW materials with the utmost anisotropic properties.

关键词： anisotropy anisotropic high

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Graphene for gold extraction

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National science Review 2022年第10期9卷 55-56页

作者： kostya s.novoselov Institute for Functional Intelligent Materials National University of Singapore

Gold is a unique element,characterized not only by limited,though still reasonable,availability (useful for monetary applications) but also for its rather unique properties useful for many industries [1]:chemical inertness,high electrical conductivity,plasticity,*** gold reserves in Earth’s crust diminish with traditional minings’urban mining’that recycles gold from gold-containing wastes (such as electronic waste,e-waste) has emerged as an important supply method for gold sustainability [2].One critical step in such a recycling process is the use of an adsorbent to extract gold from e-waste leachate that contains complex metal ***,the gold adsorbent should have a high extraction capacity,selectivity and,importantly,economic *** many porous materials have been developed for gold extraction from e-waste [3-6],materials that show high gold extraction capacity with precise gold selectivity to ppm or even lower concentrations are highly required.

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Recent advances in graphene and other 2D materials

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Nano Materials science 2022年第1期4卷 3-9页

作者： Pablo Ares kostya s.novoselov Department of Physics&Astronomy and National Graphene Institute University of ManchesterManchesterM139PLUK Centre for Advanced 2D Materials National University of Singapore117546Singapore Chongqing 2D Materials Institute Lingjiang New Area Chongqing 400714China

The isolation of the first two-dimensional material, graphene-a monolayer of carbon atoms arranged in a hexagonal lattice-opened new exciting opportunities in the field of condensed matter physics and materials. Its isolation and subsequent studies demonstrated that it was possible to obtain sheets of atomically thin crystals and that these were stable, and they also began to show its outstanding properties, thus opening the door to a whole new family of materials, known as two-dimensional materials or 2D materials. The great interest in different 2D materials is motivated by the variety of properties they show, being candidates for numerous ***, the combination of 2D crystals allows the assembly of composite, on-demand materials, known as van der Waals heterostructures, which take advantage of the properties of those materials to create functionalities that otherwise would not be accessible. For example, the combination of 2D materials, which can be done with high precision, is opening up opportunities for the study of new challenges in fundamental physics and novel applications. Here we review the latest fundamental discoveries in the area of 2D materials and offer a perspective on the future of the field.

关键词： 2D materials Graphene Molybdenum disulphide Tarition mebl dichalogenides Hexagonal boron nitride van der waals heterostructus Ulrathin nanomaterials

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Multifunctional 2D materials for antiviral protection and detection

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National science Review 2022年第5期9卷 8-9页

作者： Daria V.Andreeva kostya s.novoselov Department of Materials science and Engineering National University of Singapore Chongqing 2D Materials Institute National Graphene Institute University of Manchester

Two-dimensional (2D) materials [1]with their high surface to volume ratio,flexibility,tunable electronic properties,and most importantly—the large variety of the properties covered by the members of the 2D family—have already found their way to many applications in very different areas of technology[2].One of the most promising areas of applications for 2D crystals remains healthcare [3],where such materials have been considered for drug delivery,

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Relativistic domain-wall dynamics in van der Waals antiferromagnet MnPs_(3)

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npj Computational Materials 2022年第1期8卷 27-35页

作者： Ignacio M.Alliati Richard F.L.Evans kostya s.novoselov Elton J.G.santos school of Mathematics and Physics Queen’s University BelfastBelfastBT71NNUK Department of Physics The University of YorkYorkYO105DDUK Institute for Functional Intelligent Materials National University of SingaporeSingapore117544Singapore Institute for Condensed Matter Physics and Complex systems School of Physics and AstronomyThe University of EdinburghEdinburghEH93FDUK Higgs Centre for Theoretical Physics The University of EdinburghEdinburghEH93FDUK

The discovery of two-dimensional(2D)magnetic van der Waals(vdW)materials has flourished an endeavor for fundamental problems as well as potential applications in computing,sensing and storage *** particular interest are antiferromagnets,which due to their intrinsic exchange coupling show several advantages in relation to ferromagnets such as robustness against external magnetic *** we show that,despite of this cornerstone,the magnetic domains of recently discovered 2D vdW MnPs_(3)antiferromagnet can be controlled via magnetic fields and electric *** achieve ultrafast domain-wall dynamics with velocities up to~3000 m s^(−1)within a relativistic *** contraction and emission of spin-waves in the terahertz gap are observed with dependence on the edge termination of the *** results indicate that the implementation of 2D antiferromagnets in real applications can be further controlled through edge engineering which sets functional characteristics for ultrathin device platforms with relativistic features.

关键词： relativistic dynamics antiferromagnet

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Graphene-confined ultrafast radiant heating for high-loading subnanometer metal cluster catalysts

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National science Review 2023年第6期10卷 191-199页

作者： Ye-Chuang Han Jun Yi Beibei Pang Ning Wang Xu-Cheng Li Tao Yao kostya s.novoselov Zhong-Qun Tian state Key Laboratory of Physical Chemistry of solid surfaces College of Chemistry and Chemical Engineering Graphene Industry and Engineering Research Institute School of Electronic Science and Engineering Xiamen University Innovation Laboratory for sciences and Technologies of Energy Materials of Fujian Province (IKKEM) National synchrotron Radiation Laboratory University of Science and Technology of China Faculty of Environment and Life Beijing University of Technology Institute for Functional Intelligent Materials National University of Singapore

Thermally activated ultrafast diffusion,collision and combination of metal atoms comprise the fundamental processes of synthesizing burgeoning subnanometer metal clusters for diverse ***,so far,no method has allowed the kinetically controllable synthesis of subnanometer metal clusters without compromising metal ***,we have developed,for the first time,a graphene-confined ultrafast radiant heating(GCURH) method for the synthesis of high-loading metal cluster catalysts in microseconds,where the impermeable and flexible graphene acts as a diffusion-constrained nanoreactor for high-temperature *** from graphene-mediated ultrafast and efficient laser-to-thermal conversion,the GCURH method is capable of providing a record-high heating and cooling rate of～109℃/s and a peak temperature above 2000 ℃,and the diffusion of thermally activated atoms is spatially limited within the confinement of the graphene *** a result,due to the kinetics-dominant and diffusion-constrained condition provided by GCURH,subnanometer Co cluster catalysts with high metal loading up to 27.1 wt% have been synthesized by pyrolyzing a Co-based metal-organic framework(MOF)in microseconds,representing one of the highest size-loading combinations and the quickest rate for MOF pyrolysis in the reported *** obtained Co cluster catalyst not only exhibits an extraordinary activity similar to that of most modern multicomponent noble metal counterparts in the electro catalytic oxygen evolution reaction,but is also highly convenient for catalyst recycling and refining due to its single metal *** a novel GCURH technique paves the way for the kinetically regulated,limited diffusion distance of thermally activated atoms,which in turn provides enormous opportunities for the development of sophisticated and environmentally sustainable metal cluster catalysts.

关键词： photothermal conversion ultrafast radiant heating graphene-confined high-loading metal clusters solid catalysts

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Discovery of 2D van der Waals layered Mosi2N4 family

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National science Review 2020年第12期7卷 1842-1844页

作者： kostya s.novoselov Department of Materials science and Engineering National University of Singapore Chongqing 2D Materials Institute National Graphene Institute University of Manchester

Two-dimensional (2D) materials have attracted increasing interest since the first isolation of graphene from graphite in2004 [1] and subsequent exfoliation of other 2D crystals from a variety of layered,van der Waals (vdW),materials [2].For such crystals,atoms within each layer are connected by strong chemical bonds,

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sparse representation for machine learning the properties of defects in 2D materials

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npj Computational Materials 2023年第1期9卷 1186-1195页

作者： Nikita Kazeev Abdalaziz Rashid Al-Maeeni Ignat Romanov Maxim Faleev Ruslan Lukin Alexander Tormasov A.H.Castro Neto kostya s.novoselov Pengru Huang Andrey Ustyuzhanin Institute for Functional Intelligent Materials National University of Singapore4 Science Drive 2117544 SingaporeSingapore Constructor University Bremen gGmbH Campus Ring 1Bremen 28759Germany HsE University Myasnitskaya Ulitsa20101000 MoscowRussia Innopolis University Universitetskaya St1InnopolisRepublic of Tatarstan 420500Russia Centre for Advanced 2D Materials National University of Singapore6 Science Drive 2117546 SingaporeSingapore

Two-dimensional materials offer a promising platform for the next generation of(opto-)electronic devices and other high technology *** of the most exciting characteristics of 2D crystals is the ability to tune their properties via controllable introduction of ***,the search space for such structures is enormous,and ab-initio computations prohibitively *** propose a machine learning approach for rapid estimation of the properties of 2D material given the lattice structure and defect *** method suggests a way to represent configuration of 2D materials with defects that allows a neural network to train quickly and *** compare our methodology with the state-of-the-art approaches and demonstrate at least 3.7 times energy prediction error ***,our approach is an order of magnitude more resource-efficient than its contenders both for the training and inference part.

关键词： properties defects prediction

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Grinding exfoliation for scalable production of 2D materials

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National science Review 2020年第3期7卷 559-560页

作者： kostya s.novoselov Qi Ge Daria V.ANDreeva Department of Materials science and Engineering National University of Singapore National Graphene Institute University of Manchester

Over the past few years the utilisation of graphene in various areas of industry has strongly intensified [1]. Applications in thermal management, composite materials and energy consume an increasing amount of this tw... 详细信息

关键词： Grinding exfoliation for scalable production of 2D materials Graphene

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