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Temperature-Insensitive 850-nm Dual-Mode-VCSEL with 25.1-GHz Bandwidth at 85 °c

Journal of Lightwave technology 2023年第17期41卷 5675-5687页

作者： Cheng, Hao-Tien Yang, Yun-Cheng Wu, Chao-Hsin National Taiwan University Graduate Institute of Electronics Engineering The Center for Quantum Science and Engineering Taipei106319 Taiwan National Taiwan University Graduate Institute of Photonics and Optoelectronics The Graduate School of Advanced Technology Taipei106319 Taiwan

The detuning between the spectral positions of gain peaks and cavity resonances greatly influences the elevated temperature performances of vertical-cavity surface-emitting lasers (VCSELs). Therefore, the design and optimization of gain-cavity detuning in VCSELs have long been piquing researchers' interest. This work presents an 850-nm dual-mode-VCSEL meticulously designed with qualified higher-temperature performances in mind. Bringing enhanced functionalities over extended operating temperatures, delivering 3-dB bandwidths of 27.5 GHz at 25 °C, 26.7 GHz at 65 °C, and reaching a believed to be record-breaking 85 °C bandwidth of 25.1 GHz. The 2.4-GHz bandwidth decline with the temperature rise (25 °C to 85 °C) is considerably less impaired than in prior studies. The junction temperatures and cavity lifetimes at different temperatures are extracted by fitting spectra and microwave measurements. Lastly, we summarize and discuss the critical design features and the possible future prospectives of modern high-performance uncooled datacom VCSELs with temperature-insensitive performances. © 1983-2012 IEEE.

关键词： Surface emitting lasers

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Highly soluble organic nitrate additives for practical lithium metal batteries

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Carbon Energy 2023年第1期5卷 16-24页

作者： Zhe Wang Li-Peng Hou Zheng Li Jia-Lin Liang Ming-Yue Zhou Chen-Zi Zhao Xiaoyuan Zeng Bo-Quan Li Aibing Chen Xue-Qiang Zhang Peng Dong Yingjie Zhang Jia-Qi Huang Qiang Zhang Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijingPR China College of Chemical and Pharmaceutical Engineering Hebei University of Science and TechnologyShijiazhuangPR China School of Materials Science and Engineering Beijing Institute of TechnologyBeijingPR China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijingPR China National and Local Joint Engineering Laboratory for Lithium-Ion Batteries and Materials Preparation Technology Key Laboratory of Advanced Battery Materials of Yunnan ProvinceFaculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunmingPR China

The stability of lithium metal anodes essentially dictates the lifespan of high-energy-density lithium metal *** nitrate(LiNO_(3))is widely recognized as an effective additive to stabilize lithium metal anodes by forming LiN_(x)O_(y)-containing solid electrolyte interphase(SEI).However,its poor solubility in electrolytes,especially ester electrolytes,hinders its applications in lithium metal ***,an organic nitrate,isosorbide nitrate(ISDN),is proposed to replace LiNO_(3).ISDNhas a high solubility of 3.3M in ester electrolytes due to the introduction of organic segments in the *** decomposition of ISDN generates LiN_(x)O_(y)-rich SEI,enabling uniform lithium *** lifespan of lithium metal batteries with ISDN significantly increases from 80 to 155 cycles under demanding ***,a lithium metal pouch cell of 439Whkg^(−1) delivers 50 *** work opens a new avenue to develop additives by molecular modifications for practical lithium metal batteries.

关键词： electrolyte additives lithium metal anodes organic nitrate pouch cells solid electrolyte interphase

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Two‑Dimensional Cr_(5)Te_(8)@Graphite Heterostructure for Efficient Electromagnetic Microwave Absorption

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Nano-Micro Letters 2024年第3期16卷 407-422页

作者： Liyuan Qin Ziyang Guo Shuai Zhao Denan Kong Wei Jiang Ruibin Liu Xijuan Lv Jiadong Zhou Qinghai Shu School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081People’s Republic of China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081People’s Republic of China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081People’s Republic of China Tangshan Research Institute Beijing Institute of TechnologyTangshan 063099People’s Republic of China

Two-dimensional(2D)transition metal chalcogenides(TMCs)hold great promise as novel microwave absorption materials owing to their interlayer interactions and unique magnetoelectric ***,overcoming the impedance mismatch at the low loading is still a challenge for TMCs due to the restricted loss pathways caused by their high-density ***,an interface engineering based on the heterostructure of 2D Cr_(5)Te_(8) and graphite is in situ constructed via a one-step chemical vapor deposit to modulate impedance matching and introduce multiple attenuation ***,the Cr_(5)Te_(8)@EG(ECT)heterostructure exhibits a minimum reflection loss of up to−57.6 dB at 15.4 GHz with a thin thickness of only 1.4 mm under a low filling rate of 10%.The density functional theory calculations confirm that the splendid performance of ECT heterostructure primarily derives from charge redistribution at the abundant intimate interfaces,thereby reinforcing interfacial polarization ***,the ECT coating displays a remarkable radar cross section reduction of 31.9 dB m^(2),demonstrating a great radar microwave scattering *** work sheds light on the interfacial coupled stimulus response mechanism of TMC-based heterogeneous structures and provides a feasible strategy to manipulate high-quality TMCs for excellent microwave absorbers.

关键词： Chemical vapor deposition Interface polarization engineering Cr_(5)Te_(8)-graphite heterojunctions Microwave absorption

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Modeling and Simulation of a Wheel-less Omnidirectional Robot Moving in Isotropic Environment 4

Modeling and Simulation of a Wheel-less Omnidirectional Robo...

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4th International Symposium on Intelligent Robotics and Systems, ISoIRS 2024

作者： Gao, Yuxi Zhao, Chaoyue Kang, Shuai Li, Longchuan Asano, Fumihiko Beijing University of Chemical Technology College of Information Science and Technology Beijing China Beijing University of Chemical Technology College of Mechanical and Electrical Engineering Beijing China Japan Advanced Institute of Science and Technology Graduate School of Advanced Science and Technology Ishikawa Japan

ISBN: (纸本)9798350364798

To achieve effective locomotion in various isotropic environments, we develop an underactuated, omnidirectional, wheel-less robot powered by 2DoF wobbling mass. In contrast to traditional wheeled robots, which are efficient only in specific structured environments, this omnidirectional, wheel-less robot can freely move in a multitude of isotropic environments through the indirect control of an actively wobbling mass. In this study, we first derived the motion equations for the robot's sliding movements. Then, we implemented indirect control to drive the wobbling mass to follow an asymmetric elliptical trajectory, which demonstrates an innovative method for allowing the robot to achieve sliding motions without traditional driving wheels. Finally, we conducted numerical simulations to demonstrate the robot's sliding movements in different environments. The results show that this robot can handle various isotropic environments and possesses effective mobility. © 2024 IEEE.

关键词： Biped locomotion

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Magnetically accelerated thermal energy storage within Fe_(3)O_(4)-anchored MXene-based phase change materials

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Aggregate 2023年第1期4卷 199-209页

作者： Yan Gao Zhaodi Tang Xiao Chen Jiamin Yan Yu Jiang Jianhang Xu Zhang Tao Lei Wang Zhimeng Liu Ge Wang Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory of Function Materials for Molecule and Structure ConstructionSchool of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijingChina Institute of Advanced Materials Beijing Normal UniversityBeijingChina Shunde Graduate School University of Science and Technology BeijingShundeChina

Inherent weak photon-capturing ability is a long-standing bottleneck for pristine phase change materials(PCMs)in photothermal conversion *** conquer this difficulty,herein,magnetic Fe_(3)O_(4) nanoparticles were in situ anchored between the layers and the surface of two-dimensional MXene for the infiltration of myristic acid(MA)by an in situ chemical anchoring *** from the synergistic localized surface plasmon resonance effect of MXene and Fe_(3)O_(4) nanoparticles,our designed MXene@Fe_(3)O_(4)-MA composite PCMs harvested an ultrahigh photothermal conversion efficiency of 97.7%.During the photothermal conversion process,MXene can capture photons and convert solar energy into heat energy efficiently,and the in situ anchored Fe_(3)O_(4) nanoparticles further enhanced the photothermal conversion ***,the introduction of Fe_(3)O_(4) nanoparticles improved the thermal energy storage density(144.17 J/g)of MXene-MA composite PCMs since Fe_(3)O_(4) nanoparticles provided more heterogeneous nucleation sites for ***,MXene@Fe_(3)O_(4)-MA composite PCMs were endowed with excellent paramagnetism,and realized efficient magnetic-thermal ***,MXene@Fe_(3)O_(4)-MA composite PCMs exhibited excellent energy conversion stability,thermal stability,and reliability after undergoing multiple thermal ***,high-performance MXene@Fe_(3)O_(4)-based energy conversion composite PCMs are promising candidates to accelerate efficient utilization of the practical solar energy and magnetic energy.

关键词： in situ chemical anchoring magnetic-thermal conversion phase change materials photothermal conversion two-dimensional MXene

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Distributed Predefined-Time Control for Cooperative Tracking of Multiple Quadrotor UAVs

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IEEE/CAA Journal of Automatica Sinica 2024年第10期11卷 2179-2181页

作者： Kewei Xia Xinyi Li Kaidan Li Yao Zou Advanced Research Institute of Multidisciplinary Sciences Beijing Institute of TechnologyBeijing 100081China School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China the School of Automation Beijing Institute of TechnologyBeijing 100081China the School of Intelligence Science and Technology University of Science and Technology BeijingBeijing 100083China the Key Laboratory of Intelligent Bionic Unmanned Systems Ministry of EducationUniversity of Science and Technology BeijingBeijing 100083China

Dear Editor,This letter addresses the predefined-time control for cooperative tracking of multiple quadrotor unmanned aerial vehicles(UAVs)under a directed communication network.A predefined-time distributed estimator... 详细信息

关键词： acceleration letter estimator

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An on-Si directional second harmonic generation amplifier for MoS2/WS2 heterostructure

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Nano Research 2023年第3期16卷 4061-4066页

作者： Jiaxing Du Jianwei Shi Chun Li Qiuyu Shang Xinfeng Liu Yuan Huang Qing Zhang School of Materials Science and Engineering Peking UniversityBeijing 100871China CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China

Transition metal dichalcogenides(TMD)heterostructure is widely applied for second harmonic generation(SHG)and holds great promises for laser source,nonlinear switch,and optical logic ***,for atomically thin TMD heterostructures,low SHG conversion efficiency would occur due to reduction of light-matter interaction length and lack of phase ***,we demonstrated a facile directional SHG amplifier formed by MoS2/WS2 monolayer heterostructures suspended on a holey SiO_(2)/Si *** SHG enhancement factor reaches more than two orders of magnitude in a wide spectral range from 355 to 470 nm,and the radiation angle is reduced from 38°to 19°indicating higher coherence and better emission *** giant SHG enhancement and directional emission are attributed to the great excitation and emission field concentration induced by a self-formed vertical Fabry-Pérot *** discovery gives helpful insights for the development of two-dimensional(2D)nonlinear optical devices.

关键词： two-dimensional(2D)materials transition metal dichalcogenides heterostructure second harmonic generation field enhancement optical microcavity

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Achieving highest Young’s modulus in Al-Li by tracing the size and bonding evolution of Li-rich precipitates

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Journal of Materials science & technology 2023年第14期145卷 125-135页

作者： Chengpeng Xue Yuxuan Zhang Shuo Wang Guangyuan Tian Xinghai Yang Yubin Ke Zhenhua Xie Junsheng Wang School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China China Spallation Neutron Source Dongguan BranchInstitute of High Energy PhysicsChinese Academy of SciencesDongguan 523803China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China

For decades,it has been well accepted that every 1 wt.%Li addition to Al will reduce Al alloy’s density by 3%and increase its Young’s modulus by 6%.However,the fundamental mechanism of modulus improve-ments stays controversial though all studies agreed that the contribution of such a substantial boosting comes from Li-rich clusters either in solid solution or *** this study,we experimentally produce nano-sized Li-rich clusters by non-equilibrium solidification using centrifugal casting and trace their evolutions as a function of subsequent heat ***-resolution transmission electron mi-croscopy(HRTEM)reveals a further decrease in the lattice constants of Li-rich regions from the as-cast(0.406 nm),solid solution(0.405 nm)to the aged state(0.401 nm),while Young’s modulus of the Al-Li al-loy reaches 89.16 ***-angle neutron scattering(SANS)experiments and first-principle calculations based on density functional theory have shown both the bond strength around precipitates and the size of those Li-rich region dominate Young’s *** the beginning,it is volumetric compression due to Li addition that increases modulus,tightening the Al-Al potential *** the end,it is the Al-Al and Al-Li valence bonds in Al 3 Li at large size and high-volume fraction which increase its second derivative of internal energy and thus Young’s modulus.

关键词： Al-Li alloy Young’s modulus SANS HRTEM DFT Precipitate kinetics

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Regeneration of single-atom catalysts deactivated under acid oxygen reduction reaction conditions

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Journal of Energy Chemistry 2022年第10期31卷 478-484,I0012页

作者： Chang-Xin Zhao Ding Ren Juan Wang Jia-Ning Liu Cheng Tang Xiao Chen Bo-Quan Li Qiang Zhang Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China School of Chemical Engineering and Advanced Materials The University of AdelaideAdelaideSA 5005Australia

Single-atom catalysts serve as a promising candidate to realize noble-metal-free electrocatalytic oxygen reduction in acid ***,their poor stability under working conditions strictly restrains their practical ***,regeneration of their electrocatalytic activity is of great ***,the regeneration of a Fe-N-C single-atom catalyst is demonstrated to be feasible by a facile annealing regeneration *** activity after regeneration recovers to that of the pristine electrocatalyst and surpasses the deactivated *** regeneration mechanism is identified to be selfetching of the surface carbon layer and consequent exposure of the previously buried single-atom ***,the regeneration strategy is applicable to other single-atom *** work demonstrates the feasibility of regenerating oxygen reduction electrocatalysts and affords a pioneering approach to deal with rapid deactivation under working conditions.

关键词： Oxygen reduction reaction Single-atom catalysts Energy electrocatalysis Noble metal free Catalyst regeneration

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Regulating the inner Helmholtz plane structure at the electrolyte-electrode interface for highly reversible aqueous Zn batteries

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Journal of Energy Chemistry 2024年第8期95卷 57-67,I0002页

作者： Jianghe Liu Sanlue Hu Hexin Guo Guobin Zhang Wen Liu Jianwei Zhao Shenhua Song Cuiping Han Baohua Li Shenzhen Key Laboratory on Power Battery Safety and Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055GuangdongChina Shenzhen Key Laboratory of Advanced Materials School of Materials Science and EngineeringHarbin Institute of TechnologyShenzhen 518055GuangdongChina Faculty of Materials Science and Energy Engineering/Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055GuangdongChina Shenzhen HUASUAN Technology Co. Ltd.Shenzhen 518055GuangdongChina

The development of aqueous Zn batteries is limited by parasitic water reactions,corrosion,and dendrite *** address these challenges,an inner Helmholtz plane(IHP)regulation method is proposed by employing low-cost,non-toxic maltitol as the electrolyte *** preferential adsorption behavior of maltitol can expel the water from the inner Helmholtz plane,and thus hinder the immediate contact between Zn metal and H_(2)***,strong interaction between maltitol and H_(2)O molecules can restrain the activity of H_(2)***,the"IHP adsorption effect"along with the low LUMO energy level of maltitol-CF_(3)SO_(3)^(-)can promote the in-situ formation of an organic-inorganic complex solid electrolyte interface(SEI)*** a result,the hydrogen/oxygen evolution side reaction,corrosion,and dendrites issues are effectively suppressed,thereby leading to highly reversible and dendrite-free Zn plating/*** Zn‖I_(2)battery with hybrid electrolytes also demonstrates high electrochemical performance and ultralong cycling stability,showing a capacity retention of 75%over 20000 charge-discharge cycles at a large current density of 5 A g^(-1).In addition,the capacity of the device has almost no obvious decay over20000 cycles even at-30℃.This work offers a successful electrolyte regulation strategy via the IHP adsorption effect to design electrolytes for high-performance rechargeable Zn-ion batteries.

关键词： Inner Helmholtz plane Adsorption effect Dendrite suppression SEI layer Zn||I_(2)battery

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