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International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO)

作者： Chao Liu Kejun Wang Qian Wang School of Mechanical and Electric Engineering Soochow University Suzhou China Jiangsu Provincial Key Laboratory of Advanced Robotics Soochow University Suzhou China

Beetle hindwings have two specific features: the deployable hindwing and corrugation wing. In the low Reynolds numbers environment, the corrugated wing structure of insect wings proves to be essential for improving *** order to explore further whether flexible corrugated structure has a significant effect on aerodynamic effects. Two 3D corrugated wing models (3D-CW models) were designed with rigid and flexible properties, respectively. In this paper, based on ANSYS Fluent, the fluid-structure interaction method is used to solve the Navier-Stokes equations numerically. At a series of angles of attack, the flexible wing has better aerodynamics at angles of attack larger than 10°; the deformed leading edge can induce a stronger Leading edge vortex (LEV) than found at the rigid wing.

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The effect of NiO-Ni_(3)N interfaces in in-situ formed heterostructure ultrafine nanoparticles on enhanced polysulfide regulation in lithium-sulfur batteries

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Journal of Energy Chemistry 2022年第5期31卷 762-770页

作者： Jun Pu Zhenghua Wang Pan Xue Kaiping Zhu Jiachen Li Yagang Yao Key Laboratory of Functional Molecular Solids Ministry of EducationAnhui Provincial Engineering Laboratory for New-Energy Vehicle Battery Energy-Storage MaterialsCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002AnhuiChina National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional MaterialsCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093JiangsuChina School of Chemical Engineering Northwest UniversityXi’an 710069ShaanxiChina Division of Nanomaterials and Jiangxi Key Lab of Carbonene Materials Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesNanchang 330200JiangxiChina

Inhibiting the “shuttle effect” of soluble polysulfides and improving reaction kinetics are the key factors necessary for further exploration of high-performance Li-S batteries. Herein, an effective interface engineering strategy is reported, wherein nitriding of an Ni-based precursor is controlled to enhance Li-S cell regulation. The resulting in-situ formed NiO-Ni_(3)N heterostructure interface not only has a stronger polysulfide adsorption effect than that of monomeric NiO or Ni_(3)N but also has a faster Li ion diffusion ability than a simple physical mixture. More importantly, this approach couples the respective advantages of NiO and Ni_(3)N to reduce polarization and facilitate electron transfer during polysulfide reactions and synergistically catalyze polysulfide conversion. In addition, ultrafine nanoparticles are thought to effectively improve the use of additive materials. In summary, Li-S batteries based on this NiO-Ni_(3)N heterostructure have the features of long cycle stability, rapid charging-discharging, and good performance under high sulfur loading.

关键词： NiO-Ni_(3)N heterostructure Interface effect Ultrafine nanoparticles Li-S batteries Polysulfides

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Observation of Shubnikov-de Haas Oscillations in Large-Scale Weyl Semimetai WTe2 Films

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Chinese Physics Letters 2020年第1期37卷 64-68页

作者： Yequan Chen Yongda Chen Jiai Ning Liming Chen Wenzhuo Zhuang Liang He Rong Zhang Yongbing Xu Xuefeng Wang Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials School of Electronic Science and Engineeringand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093

Topological Weyl semimetal WTe2 with large-scale Him form has a promising prospect for new-generation spintronic ***,it remains a hard task to suppress the defect states in large-scale WTe2 films due to the chemical *** we significantly improve the crystalline quality and remove the Te vacancies in WTe2 films by post *** observe the distinct Shubnikov-de Haas quantum oscillations in WTe2 *** nontrivial Berry phase can be revealed by Landau fan diagram *** Hall mobility of WTe2 films can reach 1245cm^2V^-1s^-1 and 1423cm^2V^-1s^-1 for holes and electrons with the carrier density of 5× 10^19 cm^-3 and 2 × 10^19 cm^-3,*** work provides a feasible route to obtain high-quality Weyl semimetal films for the future topological quantum device applications.

关键词： quantum nontrivial remove

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Deciphering the contributions of spectral and structural data to wheat yield estimation from proximal sensing

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The Crop Journal 2022年第5期10卷 1334-1345页

作者： Qing Li Shichao Jin Jingrong Zang Xiao Wang Zhuangzhuang Sun Ziyu Li Shan Xu Qin Ma Yanjun Su Qinghua Guo Dong Jiang Plant Phenomics Research Centre Academy for Advanced Interdisciplinary StudiesRegional Technique Innovation Center for Wheat ProductionMinistry of AgricultureKey Laboratory of Crop Physiology and Ecology in Southern ChinaMinistry of AgricultureCollaborative Innovation Centre for Modern Crop Production co-sponsored by Province and MinistryJiangsu Key Laboratory for Information AgricultureNanjing Agricultural UniversityNanjing 210095JiangsuChina Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology International Institute for Earth System SciencesNanjing UniversityNanjing 210023JiangsuChina Department of Forestry Mississippi State UniversityMississippi StateMS 39759USA State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing 100093China Department of Ecology College of Environmental Sciencesand Key Laboratory of Earth Surface Processes of the Ministry of EducationPeking UniversityBeijing 100871China

Accurate, efficient, and timely yield estimation is critical for crop variety breeding and management optimization. However, the contributions of proximal sensing data characteristics(spectral, temporal, and spatial) to yield estimation have not been systematically evaluated. We collected long-term, hypertemporal, and large-volume light detection and ranging(Li DAR) and multispectral data to(i) identify the best machine learning method and prediction stage for wheat yield estimation,(ii) characterize the contribution of multisource data fusion and the dynamic importance of structural and spectral traits to yield estimation, and(iii) elucidate the contribution of time-series data fusion and 3 D spatial information to yield estimation. Wheat yield could be accurately(R^(2)= 0.891) and timely(approximately-two months before harvest) estimated from fused Li DAR and multispectral data. The artificial neural network model and the flowering stage were always the best method and prediction stage, respectively. Spectral traits(such as CIgreen) dominated yield estimation, especially in the early stage, whereas the contribution of structural traits(such as height) was more stable in the late stage. Fusing spectral and structural traits increased estimation accuracy at all growth stages. Better yield estimation was realized from traits derived from complete 3 D points than from canopy surface points and from integrated multi-stage(especially from jointing to heading and flowering stages) data than from single-stage data. We suggest that this study offers a novel perspective on deciphering the contributions of spectral, structural, and timeseries information to wheat yield estimation and can guide accurate, efficient, and timely estimation of wheat yield.

关键词： LiDAR Multispectral Yield Phenotype Hyper-temporal

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Picosecond Spin Current Generation from Vicinal Metal-Antiferromagnetic Insulator Interfaces

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Physical Review Letters 2024年第17期132卷 176703-176703页

作者： B. Yang Qing Ji F. Z. Huang Jiacong Li Y. Z. Tian B. Xue Ruxian Zhu Hui Wu Hanyue Yang Y. B. Yang Shaolong Tang H. B. Zhao Y. Cao J. Du B. G. Wang Chunfeng Zhang D. Wu National Laboratory of Solid State Microstructures Jiangsu Provincial Key Laboratory for Nanotechnology Collaborative Innovation Center of Advanced Microstructures and Department of Physics Nanjing University Nanjing 210093 People’s Republic of China Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education) Department of Optical Science and Engineering Fudan University Shanghai 200433 People’s Republic of China

We report the picosecond spin current generation from the interface between a heavy metal and a vicinal antiferromagnet insulator Cr2O3 by laser pulses at room temperature and zero magnetic field. It is converted into a detectable terahertz emission in the heavy metal via the inverse spin Hall effect. The vicinal interfaces are apparently the source of the picosecond spin current, as evidenced by the proportional terahertz signals to the vicinal angle. We attribute the origin of the spin current to the transient magnetic moment generated by an interfacial nonlinear magnetic-dipole difference-frequency generation. We propose a model based on the in-plane inversion symmetry breaking to quantitatively explain the terahertz intensity with respect to the angles of the laser polarization and the film azimuth. Our work opens new opportunities in antiferromagnetic and ultrafast spintronics by considering symmetry breaking.

关键词： Antiferromagnetism Spin current Surface & interfacial phenomena Ultrafast magnetic effects Antiferromagnets Terahertz techniques Ultrafast pump-probe spectroscopy

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Checkerboard ordered state in a superconducting FeSe/SrTiO3(001) monolayer

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Physical Review B 2023年第13期107卷 134516-134516页

作者： Cheng-Long Xue Qian-Qian Yuan Yong-Jie Xu Qi-Yuan Li Li-Guo Dou Zhen-Yu Jia Shao-Chun Li National Laboratory of Solid State Microstructures School of Physics Nanjing University Nanjing 210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China Jiangsu Provincial Key Laboratory for Nanotechnology Nanjing University Nanjing 210093 China

Ordered electronic states have been extensively explored in cuprates and iron-based unconventional superconductors, but seldom observed in the epitaxial FeSe/SrTiO3(001) monolayer (FeSe/STO) with an enhanced superconducting transition temperature (Tc). Here, by using scanning tunneling microscopy/scanning tunneling spectroscopy (STM/STS), we reveal a checkerboard charge order in the epitaxial FeSe/STO monolayer, with a period of four times the inter-iron-atom distance along two perpendicular directions of the iron lattice. This ordered state is uniquely present in the superconducting FeSe/STO monolayer, even at liquid nitrogen temperature, but is absent in the nonsuperconducting FeSe monolayer or bilayer. Quasi-particle interference measurements further confirm it as a static order without an energy-dependent dispersion and is gapped out within the superconductivity gap. The intensity of the charge order shows an enhancement near the superconducting transition temperature, thus implying a correlation with the high-Tc superconductivity in the FeSe/STO monolayer. This study provides a new basis for exploring the ordered electronic states and their interplay with high-Tc superconductivity in the FeSe monolayer.

关键词： Charge order Iron-based superconductors Monolayer films Molecular beam epitaxy Scanning tunneling microscopy

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advanced Porous Materials as Designer Platforms for Sequestering Radionuclide Pertechnetate

Chem and Bio Engineering

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Chem and Bio Engineering 2024年第3期1卷 199-222页

作者： Xing, Zhiwei Lai, Zhuozhi Sun, Qi Xiao, Chengliang Wang, Shuao Wang, Xiangke Aguila-Ames, Briana Thallapally, Praveen K. Martin, Kyle Ma, Shengqian Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology College of Chemical and Biological Engineering Zhejiang University Hangzhou310027 China Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions Soochow University Suzhou215123 China MOE Key Laboratory of Resources and Environmental System Optimization College of Environmental Science and Engineering North China Electric Power University Beijing102206 China New College of Florida 5800 Bay Shore Road SarasotaFL34343 United States Physical and Computational Science Directorate Pacific Northwest National Laboratory Richland RichlandWA99352 United States Department of Chemistry University of North Texas 1508 West Mulberry Street DentonTX76201 United States

Technetium-99 (99Tc), predominantly present as pertechnetate (99TcO4-), is a challenging contaminant in nuclear waste from artificial nuclear fission. The selective removal of 99TcO4- from nuclear waste and contaminated groundwater is complex due to (i) the acidic and intricate nature of high-level liquid wastes;(ii) the highly alkaline environment in low-activity level tank wastes, such as those at Hanford, and in high-level wastes at locations like Savannah River;and (iii) the potential for 99TcO4- to leak into groundwater, risking severe water pollution due to its high mobility. This Review focuses on recent developments in advanced porous materials, including metal-organic frameworks (MOFs), covalent organic frameworks (COFs), and their amorphous counterparts, porous organic polymers (POPs). These materials have demonstrated exceptional effectiveness in adsorbing 99TcO4- and similar oxyanions. We comprehensively review the adsorption mechanisms of these anions with the adsorbents, employing macroscopic batch/column experiments, microscopic spectroscopic analyses, and theoretical calculations. In conclusion, we present our perspectives on potential future research directions, aiming to overcome current challenges and explore new opportunities in this area. Our goal is to encourage further research into the development of advanced porous materials for efficient 99TcO4- management. © 2024 The Authors. Co-published by Zhejiang University and American Chemical Society.

关键词： Groundwater pollution

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Impact-Induced Frequency Up-Conversion Vibration Energy Harvester Based On Metal-Substrate Piezoelectric Thick Film

Impact-Induced Frequency Up-Conversion Vibration Energy Harv...

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Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)

作者： Kaijun Lin Manjuan Huang Xiaowei Feng Zhenming Li Wei Liu Huicong Liu School of Mechanical and Electrical Engineering Jiangsu Provincial Key Laboratory of Advanced Robotics Soochow University Suzhou CHINA Energy Storage and Electrotechnics Department China Electric Power Research Institute Limited Company Beijing CHINA

ISBN: (数字)9798350380200

ISBN: (纸本)9798350380217

This paper presents an impact-induced frequency up-conversion piezoelectric energy harvester (FUC-PEH) to improve low-frequency output performance. The FUC-PEH includes a high-frequency piezoelectric cantilever (HFPC) with resonant frequency of 210 Hz and a low-frequency S-shaped stainless-steel cantilever (LFSC) with resonant frequency of 30 Hz. The HFPC is manufactured using MEMS metal-substrate lead zirconate titanate (PZT) thick film technology. The peak open-circuit voltage of FUC-PEH reaches 54.6 V over a drive frequency range of 10 to 60 Hz, which is $80 \%$ higher than that of a single HFPC in resonant state. It is expected to replace primary batteries and used as the power source for wireless sensor nodes. In addition, the low-frequency I-shaped stainless-steel cantilever (LFC-I), II-shaped cantilever (LFC-II) and III-shaped cantilever (LFC-III) are fabricated to explore the influence of the stiffness of low-frequency cantilever, the size of proof mass and the gap distance on the output performance of FUC-PEH.

关键词： Wireless communication Vibrations Wireless sensor networks Resonant frequency Voltage Bandwidth Thick films Resonance Lead zirconate titanate Testing

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Iron Vacancy Tunable Superconductor-Insulator Transition in FeSe/SrTiO3 Monolayer

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Physical Review Letters 2023年第25期131卷 256002-256002页

作者： Cheng-Long Xue Li-Guo Dou Yong-Jie Xu Qian-Qian Yuan Qi-Yuan Li Zhen-Yu Jia Zishuang Li Ronghua Liu Shao-Chun Li National Laboratory of Solid State Microstructures School of Physics Nanjing University Nanjing 210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China Jiangsu Provincial Key Laboratory for Nanotechnology Nanjing University Nanjing 210093 China Hefei National Laboratory Hefei 230088 China

The Fe4Se5 with a 5×5 Fe vacancy order is suggested to be a Mott insulator and the parent state of bulk FeSe superconductor. The iron vacancy ordered state has been considered as a Mott insulator and the parent compound of bulk FeSe-based superconductors. However, for the superconducting FeSe/SrTiO3 monolayer (FeSe/STO) with an interface-enhanced high transition temperature (Tc), the electronic evolution from its Fe vacancy ordered parent phase to the superconducting state, has not been explored due to the challenge to realize an Fe vacancy order in the FeSe/STO monolayer, even though important to the understanding of superconductivity mechanism. In this study, we developed a new method to generate Fe vacancies within the FeSe/STO monolayer in a tunable fashion, with the assistance of atomic hydrogen. As a consequence, an insulating 5×5 Fe vacancy ordered monolayer is realized as the parent state. By using scanning tunneling microscopy and scanning tunneling spectroscopy, the spectral evolution from superconductivity to insulator is fully characterized. Surprisingly, a prominent spectral weight transfer occurs, thus implying a strong electron correlation effect. Moreover, the Fe vacancy induced insulating gap exhibits no Mott gap-like features. This work provides new insights in understanding the high-Tc superconductivity in FeSe/STO monolayer.

关键词： Superconductor-insulator transition Iron-based superconductors Monolayer films Molecular beam epitaxy Scanning tunneling microscopy

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Highly efficient electroluminescence from Si quantum dot/SiO2 multilayer light-emitting devices via phosphorus/boron co-doping and surface nano-structuring

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Optics Letters 2025年第12期50卷 3927-3930页

作者： Junnan Han Yuhao Wang Jiaming Chen Teng Sun Dongke Li Wei Li Ling Xu Jun Xu Kunji Chen National Laboratory of Solid State Microstructures School of Electronic Science and Engineering Collaborative Innovation Center of Advanced Microstructures Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials Nanjing University Nanjing 210093 China State Key Laboratory of Silicon and Advanced Semiconductor Materials ZJU-Hangzhou Global Scientific and Technological Innovation Center School of Materials Science and Engineering Zhejiang University Hangzhou 311200 China ldkest@*** School of Microelectronics and School of Integrated Circuits and Jiangsu Key Laboratory of Semi. Dev. & IC Design Package and Test Nantong University Nantong 226019 China

Enhancing emission efficiency presents a challenge for Si-based light emission devices in all-silicon monolithic optoelectronic integration. This study introduces phosphorus (P)/boron (B) co-doping to significantly increase the electroluminescence intensity of Si quantum dots (QDs)—nearly tenfold compared to undoped devices. The turn-on voltage drops from 15 V for undoped to 6 V for co-doped devices and further reduces to 3 V with a nanostructured Si substrate to improve light extraction efficiency. The redshift of electroluminescence peak after co-doping is also observed, and the possible mechanism is briefly discussed. Stability tests show power efficiency up to 1.02% and maximum external quantum efficiency of 4.9%. These findings demonstrate the superior optoelectronic quality and stability of silicon nanomaterial-based devices, highlighting their potential in integrated silicon photonics.

关键词： Integrated photonics Light extraction Quantum dots Quantum efficiency Scanning electron microscopy Silicon photonics

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