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Ultralow-pressure mechanical-motion switching of ferroelectric polarization

Science Advances 2025年第18期11卷 eadr5337页

作者： Wang, Baoyu He, Xin Luo, Jianjun Chen, Yitong Zhang, Zhixiang Wang, ding Lan, Shangui Wang, Peijian Han, Xun Zhao, Yuda Li, Zheng Hu, Huan Xu, Yang Luo, Zhengdong Hu, Weijin Zhu, Bowen Sun, Jian Liu, Yan Han, Genquan Zhang, Xixiang Yu, Bin Chang, Kai Xue, Fei College of integrated circuits ZJU-hangzhou Global Scientific and technological innovation center Zhejiang University hangzhou311215 China Center for Quantum Matter School of Physics Zhejiang University hangzhou310027 China CAS center for excellence in nanoscience Beijing Key laboratory of Micro-nano energy and Sensor Beijing institute of nanoenergy and nanosystems chinese Academy of Sciences Beijing100083 China Key laboratory of 3d Micro/nano Fabrication and characterization of Zhejiang Province School of engineering Westlake University hangzhou310024 China ZJUi institute international campus Zhejiang University haining314400 China Hangzhou institute of technology Xidian University hangzhou311200 China State Key discipline laboratory of Wide BandGap Semiconductor technology School of Microelectronics Xidian University Xi’an710071 China Shenyang110016 China School of Physics central South University changsha410083 China Physical Science and engineering division King Abdullah University of Science and technology thuwal23955-6900 Saudi Arabia

Ferroelectric polarization switching, achieved by mechanical forces, enables the storage of stress information in ferroelectrics and holds promise for human interface applications. The prevailing mechanical approach is locally induced flexoelectricity with large strain gradients. However, this approach usually requires huge mechanical forces, which greatly impede device applications. Here, we report an approach of using triboelectric effect to mechanically, reversibly switch ferroelectric polarization across α-In2Se3 ferroelectric memristors. Through contact electrification and electrostatic induction effects, triboelectric units are used to sensitively detect mechanical forces and generate electrical voltage pulses to trigger α-In2Se3 resistance switching. We realize multilevel resistance states under different mechanical forces, by which a neuromorphic stress system is demonstrated. Notably, we achieve the reversal of α-In2Se3 ferroelectric polarization with a record-low mechanical force of ~10 kilopascals and even with tactile touches. Our work provides a fundamental but pragmatic strategy for creating mechanical tactile ferroelectric memory devices. copyright © 2025 the Authors, some rights reserved

关键词： Ferroelectric materials

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Quantum Geometric Origin of Strain-Tunable Giant Second-Harmonic Generation in Bi2O2X (X=S, Se, Te)

arXiv

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arXiv 2025年

作者： Lou, Zhefeng Gong, Zhihao Zhu, Ziye Li, Wenbin Lin, Xiao Wang, Hua Center for Quantum Matter School of Physics Zhejiang University Hangzhou310058 China Key Laboratory for Quantum Materials of Zhejiang Province Department of Physics School of Science Research Center for Industries of the Future Westlake University Hangzhou310030 China Institute of Natural Sciences Westlake Institute for Advanced Study Hangzhou310024 China Academy of Interdisciplinary Studies on Intelligent Molecules Tianjin Key Laboratory of Structure and Performance for Functional Molecules College of Chemistry Tianjin Normal University Tianjin300387 China Eastern Institute for Advanced Study Eastern Institute of Technology Zhejiang Ningbo315200 China Hefei National Laboratory University of Science and Technology of China Hefei230026 China Key Laboratory of 3D Micro/nano Fabrication and Characterization of Zhejiang Province School of Engineering Westlake University Zhejiang Province Hangzhou310024 China

Two-dimensional (2d) materials with giant nonlinear optical (NLO) responses are essential for the development of advanced on-chip NLO devices. Using first-principles calculations, we predict a remarkable strain-induced enhancement of second-harmonic generation (SHG) in the high-performance 2d semiconductors Bi2O2X (X = S, Se, Te). The SHG susceptibilities of Bi2O2X under strain are on the order of 1 nm/V, rivalling the highest values reported among 2d materials. This giant SHG response originates from gauge-invariant geometric quantities, including the quantum metric, shift vector, and triple phase product. The strain also induces a bandgap variation in Bi2O2X. Intriguingly, in Bi2O2Te, strain-induced bandgap tuning drives a transition from a semiconductor to a half-metal, and ultimately to a polar metal. Our findings present a unique platform that combines strain-tunable bandgap engineering with exceptional NLO properties, while also highlighting the crucial role of quantum geometry in enhancing SHG. Copyright © 2025, The Authors. All rights reserved.

关键词： nanocrystals

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Achieve equilibrium outside the contact angle hysteresis

arXiv

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arXiv 2025年

作者： Liu, Lei Guo, Guanlong Wang, Kaiyu Chen, Linke Fan, Yangyang Torres, Sergio Andres Galindo Lv, Jiu-An Huppert, Herbert E. Wei, Changfu Lei, Liang College of Environmental and Resources Science Zhejiang University Zhejiang Hangzhou310058 China Research Center for Industries of the Future Westlake University Zhejiang Hangzhou310030 China Key Laboratory of Coastal Environment and Resources of Zhejiang Province School of Engineering Westlake University Zhejiang310030 Hangzhou China Institute of Advanced Technology Westlake Institute for Advanced Study Zhejiang Hangzhou310024 China Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of Engineering Westlake University Hangzhou310024Zhejiang China Institute of Theoretical Geophysics King's College University of Cambridge King's Parade CambridgeCB2 1ST United Kingdom State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Hubei Wuhan43001 China

It is common belief that the equilibrium contact angle, corresponding to the minimum system energy state, lies between advancing and receding contact angles. Here, we derive advancing and receding contact angles considering the micro contacting processes on ideal rough 2d surfaces. Equilibrium contact angles obtained via energy minimization can be smaller than the receding contact angle and reach 0 degrees, at which hysteresis diminishes on the super-hydrophilic surface. Gibbs free energy analyses, numerical simulations and physical experiments all confirm these new findings. Copyright © 2025, The Authors. All rights reserved.

关键词： Contact angle

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Ultralow-pressure mechanical-motion switching of ferroelectric polarization

arXiv

引用

arXiv 2025年

作者： Wang, Baoyu He, Xin Luo, Jianjun Chen, Yitong Zhang, Zhixiang Wang, ding Lan, Shangui Wang, Peijian Han, Xun Zhao, Yuda Li, Zheng Hu, Huan Xu, Yang Luo, Zhengdong Hu, Weijin Zhu, Bowen Sun, Jian Liu, Yan Han, Genquan Zhang, Xixiang Yu, Bin Chang, Kai Xue, Fei College of Integrated Circuits ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Hangzhou311215 China Center for Quantum Matter School of Physics Zhejiang University Hangzhou310027 China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and Sensor Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing100083 China Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of Engineering Westlake University Hangzhou310024 China ZJUI Institute Zhejiang University International Campus Haining314400 China Hangzhou Institute of Technology Xidian University Hangzhou311200 China State Key Discipline Laboratory of Wide BandGap Semiconductor Technology School of Microelectronics Xidian University Xi’an710071 China Shenyang110016 China School of Physics Central South University Changsha410083 China Physical Science and Engineering Division King Abdullah University of Science and Technology Thuwal23955-6900 Saudi Arabia

Ferroelectric polarization switching, achieved by mechanical forces, enables the storage of stress information in ferroelectrics, and holds promise for human-interfacing applications. The prevailing mechanical approach is locally induced flexoelectricity with large strain gradients. However, this approach usually requires huge mechanical pressures, which greatly impedes device applications. Here, we report an approach of using triboelectric effect to mechanically, reversibly switch ferroelectric polarization across α-In2Se3 ferroelectric memristors. Through contact electrification and electrostatic induction effects, triboelectric units are used to sensitively detect mechanical forces and generate electrical voltage pulses to trigger α-In2Se3 resistance switching. We realize multilevel resistance states under different mechanical forces, by which a neuromorphic stress system is demonstrated. Strikingly, we achieve the reversal of α-In2Se3 ferroelectric polarization with a record-low mechanical pressure of ~ 10 kPa, and even with tactile touches. Our work provides a fundamental but pragmatic strategy for creating mechanical-tactile ferroelectric memory devices. Copyright © 2025, The Authors. All rights reserved.

关键词： Ferroelectricity

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In-situ construction of high-mechanical-strength and fast-ion-conductivity interphase for anode-free Li battery

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Journal of Energy Chemistry 2023年第5期80卷 207-214,I0006页

作者： Yangfan Lin Juner Chen Han Zhang Jianhui Wang Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake UniversityHangzhou 310024ZhejiangChina Institute of Advanced Technology Westlake Institute for Advanced StudyHangzhou 310024ZhejiangChina Department of Chemistry Zhejiang UniversityHangzhou 310027ZhejiangChina

The solid electrolyte interphase(SEI)with strong mechanical strength and high ion conductivity is highly desired for Li metal batteries,especially for harsh anode-free ***,we report a pragmatic approach to the in-situ construction of high-quality SEI by applying synergistic additives of Li NO_(3)and ethylene sulfite(ES)in the *** obtained SEI exhibits a high average Young’s modulus(9.02GPa)and exchanging current density(4.59 mA cm^(-2)),which are 3.0 and 1.2 times as large as those using the sole additive of LiNO_(3),*** this improved SEI,Li-dendrite growth and side reactions are effectively suppressed,leading to an ultra-high Coulombic efficiency(CE)of 99.7%for Li plating and *** applying this improved electrolyte in full cells,it achieves a high capacity retention of 89.7%for over 150 cycles in a LiFePO_(4)||Li battery(~12 mg cm^(-2)cathode,50μm Li)and of 44.5%over 100 cycles in a LiFePO_(4)||Cu anode-free battery.

关键词： Anode-free Li battery Solid electrolyte interphase Additive Lithiu mnitrate Ethylene sulfite

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Surface plasmons interference nanogratings:wafer-scale laser direct structuring in seconds

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Light(Science & Applications) 2022年第7期11卷 1607-1614页

作者： liao Geng Wei Yan Liping Shi Min Qiu Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake University18 Shilongshan RoadHangzhou 310024 Zhejiang ProvinceChina Institute of Advanced Technology Westlake Institute for Advanced Study18 Shilongshan RoadHangzhou 310024 Zhejiang ProvinceChina

It is always a great challenge to bridge the nano-and macro-worlds in nanoscience,for instance,manufacturing uniform nanogratings on a whole wafer in seconds instead of hours even ***,we demonstrate a single-step while extremely high-throughput femtosecond laser scanning technique to obtain wafer-scale,highly regular nanogratings on semiconductor-on-metal thin *** technique takes advantage of long-range surface plasmons-laser interference,which is regulated by a self-initiated *** controlling the scanning speed,two types of nanogratings are readily manufactured,which are produced by either oxidation or *** achieve a record manufacturing speed(>1 cm^(2)s^(-1)),with tunable periodicity of∧<1μ*** fractional variation of their periodicity is evaluated to be as low as△∧/∧≈0.5%.Furthermore,by utilizing the semiconductor-on-metal film-endowed interference effects,an extremely high energy efficiency is achieved via suppressing light reflection during femtosecond laser *** the fabricated nanogratings exhibit multi-functionality,we exemplify their practical applications in highly sensitive refractive index sensing,vivid structural colors,and durable superhydrophilicity.

关键词： utilizing wafer refractive

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Curvature-controlled band alignment transition in 1d van der Waals heterostructures

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npj Computational Materials 2023年第1期9卷 1411-1419页

作者： Shu Zhao Chunxia Yang Ziye Zhu Xiaoping Yao Wenbin Li School of Materials Science and Engineering Zhejiang University310027 HangzhouChina Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake University310030 HangzhouChina Institute of Advanced Technology Westlake Institute for Advanced Study310024 HangzhouChina

The effect of curvature on the band alignment of one-dimensional (1d) van der Waals (vdW) transition metal dichalcogenide(TMdC) heterostructures is studied by comprehensive first-principles calculations. We find that, as the diameter of a TMdCnanotube decreases, the combined effect of curvature-induced flexoelectricity and circumferential tensile strain causes a rapidlowering of the conduction band minimum, whereas the valence band maximum exhibits an initial lowering before rising. Asindividual TMdC nanotubes form coaxial heterostructures, the concerted effect of diameter-dependent band-edge levels andintertube coupling via flexovoltage can result in a transition of intertube band alignment from Type II to Type I in multipleheterostructural systems, including large-diameter MoSe_(2)@WS_(2), MoTe_(2)@MoSe_(2), and MoTe_(2)@WS_(2) heterostructures. These results laydown a foundation for the rational design of 1d vdW heterostructures.

关键词： alignment curvature band

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Night-time radiative warming using the atmosphere

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Light(Science & Applications) 2023年第12期12卷 2589-2596页

作者： Yining Zhu Yiwei Zhou Bing Qin Rui Qin Min Qiu Qiang Li State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake UniversityHangzhou 310024China Institute of Advanced Technology Westlake Institute for Advanced StudyHangzhou 310024China

Night-time warming is vital for human production and daily *** methods like active heaters are energy-intensive,while passive insulating films possess restrictions regarding space consumption and the lack of heat *** this work,a nanophotonic-based night-time warming strategy that passively inhibits thermal radiation of objects while actively harnessing that of atmosphere is *** using a photonic-engineered thin film that exhibits high reflectivity(~0.91)in the atmospheric transparent band(8-14μm)and high absorptivity(~0.7)in the atmospheric radiative band(5-8 and 14-16μm),temperature rise of 2.1℃/4.4℃compared to typical low-e film and broadband absorber is ***,net heat loss as low as 9Wm-2 is experimentally observed,compared to 16 and 39Wm-2 for low-e film and broadband absorber,*** strategy suggests an innovative way for sustainable warming,thus contributes to addressing the challenges of climate change and promoting global carbon neutrality.

关键词： passive radiative absorber

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Ice lithography for 3d nanofabrication

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Science Bulletin 2019年第12期64卷 865-871页

作者： ding Zhao Anpan Han Min Qiu National Centre for Nano Fabrication and Characterization Technical University of DenmarkKongens Lyngby2800Denmark Department of Mechanical Engineering Technical University of DenmarkKongens Lyngby2800Denmark Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake UniversityHangzhou 310024China Institute of Advanced Technology Westlake Institute for Advanced StudyHangzhou 310024China

nanotechnology and nanoscience are enabled by nanofabrication. Electron-beam lithography, which makes 2 d patterns down to a few nanometers, is one of the fundamental pillars of ***, significant progress in 3 d electron-beam-based nanofabrication has been made, such as the emerging ice lithography technology, in which ice thin-films are patterned by a focused electronbeam. Here, we review the history and progress of ice lithography, and focus on its applications in efficient 3 d nanofabrication and additive manufacturing or nanoscale 3 d printing. The finest linewidth made using frozen octane is below 5 nm, and nanostructures can be fabricated in selected areas on non-planar surfaces such as freely suspended nanotubes or nanowires. As developing custom instruments is required to advance this emerging technology, we discuss the evolution of ice lithography instruments and highlight major instrumentation advances. Finally, we present the perspectives of 3 d printing of functional materials using organic ices. We believe that we barely scratched the surface of this new and exciting research area, and we hope that this review will stimulate cutting-edge and interdisciplinary research that exploits the undiscovered potentials of ice lithography for 3 d photonics, electronics and 3 d nanodevices for biology and medicine.

关键词： nanotechnology nanofabrication Electron-beam lithography Ice lithography 3d nanofabrication Additive manufacturing Organic ice

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Multimaterial Embedded 3d Printing of Composite Reinforced Soft Actuators

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Research 2023年第4期2023卷 727-737页

作者： Zhenhua Wang Boyu Zhang Qu He Hao Chen Jizhe Wang Yuan Yao Nanjia Zhou Weicheng Cui Key Laboratory of Coastal Environment and Resources of Zhejiang Province School of EngineeringWestlake UniversityHangzhouZhejiang ProvinceChina Institute of Advanced Technology Westlake Institute for Advanced StudyHangzhouZhejiang ProvinceChina Research Center for Industries of the Future and Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang ProvinceSchool of EngineeringWestlake UniversityHangzhouZhejiang ProvinceChina

Soft pneumatic actuators(SPAs)have attracted enormous attention in the growing field of *** different SPAs,composite reinforced actuators(CRAs)are widely used because of their simple structure and high ***,multistep molding,a time-consuming method,is still the predominant fabrication ***,we propose a multimaterial embedded printing method(ME3P)to fabricate *** comparison with other 3-dimensional printing methods,our method improves fabrication flexibility *** the design and fabrication of the reinforced composites’patterns and different geometries of the soft body,we demonstrate actuators with programmable responses(elongation,contraction,twisting,bending,and helical and omnidirectional bending).Finite element analysis is employed for the prediction of pneumatic responses and the inverse design of actuators based on specific actuation ***,we use tube-crawling robots as a model system to demonstrate our ability to fabricate complex soft robots for practical *** work demonstrates the versatility of ME3P for the future manufacturing of CRA-based soft robots.

关键词： composites composite printing

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