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Defects‑Rich Heterostructures Trigger Strong Polarization Coupling in Sulfides/Carbon Composites with Robust Electromagnetic Wave Absorption

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nano-micro Letters 2025年第1期17卷 528-547页

作者： Jiaolong Liu Siyu Zhang Dan Qu Xuejiao Zhou Moxuan Yin Chenxuan Wang Xuelin Zhang Sichen Li Peijun Zhang Yuqi Zhou Kai Tao Mengyang Li Bing Wei Hongjing Wu Mengyang Li Bing Wei Hongjing Wu School of Physics Xidian UniversityXi’an 710071People’s Republic of China School of Advanced Materials and nanotechnology State Key Discipline Laboratory of Wide Band Gap Semiconductor TechnologyXidian UniversityXi’an 710071People’s Republic of China School of microelectronics Xidian UniversityXi’an 710071People’s Republic of China School of Telecommunication Engineering Xidian UniversityXi’an 710071People’s Republic of China MOE Key laboratory of Material Physics and Chemistry Under Extraordinary School of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China The Ministry of Education Key laboratory of micro and nano Systems forAerospace School of Mechanical EngineeringNorthwestern PolytechnicalUniversityXi’an 710072People’s Republic of China

Defects-rich heterointerfaces integrated with adjustable crystalline phases and atom vacancies,as well as veiled dielectric-responsive character,are instrumental in electromagnetic *** methods,however,constrain their delicate ***,an innovative alternative is proposed:carrageenan-assistant cations-regulated(CACR)strategy,which induces a series of sulfides nanoparticles rooted in situ on the surface of carbon *** unique configuration originates from strategic vacancy formation energy of sulfides and strong sulfides-carbon support interaction,benefiting the delicate construction of defects-rich heterostructures in M_(x)S_(y)/carbon composites(M-CAs).Impressively,these generated sulfur vacancies are firstly found to strengthen electron accumulation/consumption ability at heterointerfaces and,simultaneously,induct local asymmetry of electronic structure to evoke large dipole moment,ultimately leading to polarization coupling,i.e.,defect-type interfacial ***“Janus effect”(Janus effect means versatility,as in the Greek two-headed Janus)of interfacial sulfur vacancies is intuitively confirmed by both theoretical and experimental investigations for the first ***,the sulfur vacancies-rich heterostructured Co/Ni-CAs displays broad absorption bandwidth of 6.76 GHz at only 1.8 mm,compared to sulfur vacancies-free CAs without any dielectric *** defects-rich heterostructures,this one-pot CACR strategy may steer the design and development of advanced nanomaterials,boosting functionality across diverse application domains beyond electromagnetic response.

关键词： Defects-rich heterointerfaces Sulfides Polarization coupling Electromagnetic wave absorption

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Determination of Elastoplastic Properties of 2024 Aluminum Alloy Using Deep Learning and Instrumented nanoindentation Experiment

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Acta Mechanica Solida Sinica 2023年第2期36卷 327-339页

作者： Mingzhi Wang Guitao Zhang Tingguang Liu Weidong Wang School of Mechano-Electronic Engineering Xidian UniversityXi’an 710071China cityu-xidian joint laboratory of micro/nano manufacturing Shenzhen 518057China National Center for Materials Service Safety University of Science and Technology BeijingBeijing 100083China

The instrumented nanoindentation technique has been widely used to measure the tensile properties of various materials,for its simple specimen preparation and nearly nondestructive testing *** this paper,a novel inverse method is established for measuring the elastoplastic properties of Al 2024 *** grid indentation experiments are performed on Al 2024 *** obtained experimental load–displacement(P–h)data exhibit obvious scatter *** artificial neural network(ANN)model with tunable hyper-parameters is adopted to establish the forward relationship between elastoplastic parameters and indentation load–displacement *** objective function for quantifying the error norm between predicted and experimental P–h snapshots is *** parameter identification problem is solved using the“interior-point”constraint optimization algorithm..The identified material properties show good agreement with the tensile data,and the error values are−8.66%for elastic modulus,1.08%for yield stress,and 6.90%for hardening *** sensitivity of numerical results to experimental uncertainty is analyzed,and the error bound of experimental data is *** results of sensitivity analysis indicate that the proposed inverse method in the work is very effective and reliable.

关键词： nanoindentation Material properties Al 2024 alloy Deep learning Parameter identification

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A flat-based plasmonic fiber probe for nanoimaging

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nano Research 2023年第5期16卷 7545-7549页

作者： Fei Wang Shaobo Li Shuhao Zhao Ze Zhang Peirui Ji Chengsheng Xia Biyao Cheng Guofeng Zhang Shuming Yang State Key laboratory for manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesXi’an Jiaotong UniversityXi’an 710049China

The difficulty of obtaining high-intensity localized light spots for optical probes leads to their lack of good applications in *** we demonstrate a Fabry–Pérot resonance flat-based plasmonic fiber probe(FPFP).The simulation results show that the probe can obtain a nanofocusing spot at the tip with the radially polarized *** Fabry–Pérot interference structure is used to control the plasmon propagation on the surface of the probe,it effectively improves the local spot intensity at the ***,the experimental results verify that the FPFP(tip curvature radius is 20 nm)prepared by chemical etching method can obtain a nanofocusing spot at the *** nanoimaging of the gold slit structure demonstrates the nanoimaging capability of the FPFP,the 36.9 nm slit width is clearly identified by the FPFP.

关键词： optical probe nanoimaging controlling plasmon propagation nanofocusing local electric field enhancement

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Flexible Waterproof Piezoresistive Pressure Sensors with Wide Linear Working Range Based on Conductive Fabrics

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nano-micro Letters 2020年第11期12卷 229-241页

作者： Hongcheng Xu Libo Gao Yuejiao Wang Ke Cao Xinkang Hu Liang Wang Meng Mu Min Liu Haiyan Zhang Weidong Wang Yang Lu School of Mechano‑Electronic Engineering Xidian UniversityXi’an 710071People’s Republic of China cityu-xidian joint laboratory of micro/nano-manufacturing Xi’an 710071People’s Republic of China Department of Mechanical Engineering City University of Hong KongKowloon 999077Hong Kong SARPeople’s Republic of China nano‑manufacturing laboratory(NML) Shenzhen Research Institute of City University of Hong KongShenzhen 518057People’s Republic of China micro‑/nano‑technology Research Center State Key Laboratory for Manufacturing Systems EngineeringXi’an Jiaotong UniversityXi’an 710049People’s Republic of China

Developing flexible sensors with high working performance holds intense interest for diverse applications in leveraging the Internet-of-things(IoT)*** flexible piezoresistive sensors,traditionally most efforts are focused on tailoring the sensing materials to enhance the contact resistance variation for improving the sensitivity and working range,and it,however,remains challenging to simultaneously achieve flexible sensor with a linear working range over a high-pressure region(>100 kPa)and keep a reliable ***,we devised a laserengraved silver-coated fabric as"soft"sensor electrode material to markedly advance the flexible sensor's linear working range to a level of 800 kPa with a high sensitivity of 6.4 kPa^-1 yet a fast response time of only 4 ms as well as long-time durability,which was rarely reported *** integrated sensor successfully routed the wireless signal of pulse rate to the portable smartphone,further demonstrating its potential as a reliable *** with the rationally building the electrode instead of merely focusing on sensing materials capable of significantly improving the sensor's performance,we expect that this design concept and sensor system could potentially pave the way for developing more advanced wearable electronics in the future.

关键词： Flexible sensor Piezoresistive Graphite flakes Laser engraving Silver fabrics

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Plate-based cylinder metamaterial with negative Poisson's ratio and outstanding mechanical performance

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Science China(Technological Sciences) 2023年第3期66卷 793-806页

作者： LI Xiang XIAO Ran CHEN JuZheng LI JingQi FAN Rong SONG Jian LU Yang School of Sciences Nanjing University of Science and TechnologyNanjing 210094China nano-manufacturing laboratory(NML) Shenzhen Research Institute City University of Hong KongShenzhen 518057China Department of Mechanical Engineering City University of Hong KongHong Kong 999077China College of Civil and Transportation Engineering Shenzhen UniversityShenzhen 518060China cityu-xidian joint laboratory of micro/nano-manufacturing Shenzhen 518057China

Plate-based cellular materials exhibit greater stiffness and strength than conventional cellular materials formed by *** this study,we designed and fabricated a plate-based auxetic cylinder metamaterial using high-resolution projection micro-stereolithography three-dimensional printing *** and modeling results validated the auxetic behavior of the plate-based *** normalized Young’s modulus and yield strength of a four-layer auxetic cylinder are increased by 141%and 32%,respectively,compared with the conventional auxetic *** study presents a universal strategy for fabricating plate-based auxetic metamaterials with appropriate mechanical performance for various structural applications.

关键词： auxetic plate-based cylinder mechanical metamaterial 3D printing

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Multi-model ensemble learning for battery state-of-health estimation:Recent advances and perspectives

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Journal of Energy Chemistry 2025年第1期100卷 739-759页

作者： Chuanping Lin Jun Xu Delong Jiang Jiayang Hou Ying Liang Zhongyue Zou Xuesong Mei State Key laboratory for manufacturing Systems Engineering Xi'an Jiaotong University Shaanxi Key laboratory of Intelligent Robots School of Mechanical Engineering Xi'an Jiaotong University Department of Electrical Engineering and Automation Luoyang Institute of Science and Technology School of Mechanical Engineering Hangzhou Dianzi University

The burgeoning market for lithium-ion batteries has stimulated a growing need for more reliable battery performance monitoring. Accurate state-of-health(SOH) estimation is critical for ensuring battery operational performance. Despite numerous data-driven methods reported in existing research for battery SOH estimation, these methods often exhibit inconsistent performance across different application scenarios. To address this issue and overcome the performance limitations of individual data-driven models,integrating multiple models for SOH estimation has received considerable attention. Ensemble learning(EL) typically leverages the strengths of multiple base models to achieve more robust and accurate outputs. However, the lack of a clear review of current research hinders the further development of ensemble methods in SOH estimation. Therefore, this paper comprehensively reviews multi-model ensemble learning methods for battery SOH estimation. First, existing ensemble methods are systematically categorized into 6 classes based on their combination strategies. Different realizations and underlying connections are meticulously analyzed for each category of EL methods, highlighting distinctions, innovations, and typical applications. Subsequently, these ensemble methods are comprehensively compared in terms of base models, combination strategies, and publication trends. Evaluations across 6 dimensions underscore the outstanding performance of stacking-based ensemble methods. Following this, these ensemble methods are further inspected from the perspectives of weighted ensemble and diversity, aiming to inspire potential approaches for enhancing ensemble performance. Moreover, addressing challenges such as base model selection, measuring model robustness and uncertainty, and interpretability of ensemble models in practical applications is emphasized. Finally, future research prospects are outlined, specifically noting that deep learning ensemble is poised to advance ens

关键词： Lithium-ion battery State-of-health estimation Data-driven Machine learning Ensemble learning Ensemble diversity

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Stereolithographic 3D Printing-Based Hierarchically Cellular Lattices for High-Performance Quasi-Solid Supercapacitor

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nano-micro Letters 2019年第3期11卷 165-177页

作者： Jianzhe Xue Libo Gao Xinkang Hu Ke Cao Wenzhao Zhou Weidong Wang Yang Lu School of Telecommunications Engineering Xidian UniversityXian710071People’s Republic of China School of Mechano.Electronic Engineering Xidian UniversityXian710071People’s Republic of China cityu-xidian joint laboratory of micro/nano-manufacturing Shenzhen518057People’s Republic of China Department of Mechanical Engineering City University of Hong KongKowloon999077Hong KongSARPeople’s Republic of China nano-manufacturing laboratory(NML) Shenzhen Research Institute of City University of Hong KongShenzhen518057People’s Republic of China

3D printing-based supercapacitors have been extensively explored,yet the rigid rheological requirement for corresponding ink preparation significantly limits the manufacturing of true 3D architecture in achieving superior energy *** proposed the stereolithographic technique to fabricate the metallic composite lattices with octet-truss arrangement by using electroless plating and engineering the 3D hierarchically porous graphene onto the scaffolds to build the hierarchically cellular lattices in quasi-solid supercapacitor *** supercapacitor device that is composed of composite lattices span several pore size orders from nm to mm holds promising behavior on the areal capacitance(57.75 mF cm-2),rate capability(70% retention,2-40 mA cm-2),and long lifespan(96% after 5000 cycles),as well as superior energy density of 0.008 mWh cm-2,which are comparable to the state-of-the-art carbon-based *** synergistically combining this facile stereolithographic 3D printing technology with the hierarchically porous graphene architecture,we provide a novel route of manufacturing energy storage device as well as new insight into building other high-performance functional electronics.

关键词： 3D printing Lattices Graphene Supercapacitor Porous structure Stereolithography

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Flexible pressure sensors with ultrahigh stress tolerance enabled by periodic microslits

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microsystems & nanoengineering 2024年第1期10卷 301-311页

作者： Song Wang Chenying Wang Yifan Zhao Yujing Zhang Yaxin Zhang Xiangyue Xu Qijing Lin Kai Yao Yuheng Wang Feng Han Yu Sun Zhuangde Jiang State Key laboratory for manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesSchool of Mechanical EngineeringXi’an Jiaotong UniversityXi’anChina State Key laboratory for manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesSchool of Instrument Science and TechnologyXi’an Jiaotong UniversityXi’anChina The Faculty of Electrical Engineering and Computer Science Ningbo UniversityNingboChina Department of Mechanical and Industrial Engineering University of TorontoTorontoCanada

Stress tolerance plays a vital role in ensuring the effectiveness of piezoresistive sensing films used in flexible pressure ***,existing methods for enhancing stress tolerance employ dome-shaped,wrinkle-shaped,and pyramidal-shaped microstructures in intricate molding and demolding processes,which introduce significant fabrication challenges and limit the sensing *** address these shortcomings,this paper presents periodic microslits in a sensing film made of multiwalled carbon nanotubes and polydimethylsiloxane to realize ultrahigh stress tolerance with a theoretical maximum of 2.477 MPa and a sensitivity of 18.092 kPa−*** periodic microslits permit extensive deformation under high pressure(e.g.,400 kPa)to widen the detection ***,the periodic microslits also enhance the sensitivity based on simultaneously exhibiting multiple synapses within the sensing interface and between the periodic sensing *** proposed solution is verified by experiments using sensors based on the microslit strategy for wind direction detection,robot movement sensing,and human health *** these experiments,vehicle load detection is achieved for ultrahigh pressure sensing under an ultrahigh pressure of over 400 kPa and a ratio of the contact area to the total area of 32.74%.The results indicate that the proposed microslit strategy can achieve ultrahigh stress tolerance while simplifying the fabrication complexity of preparing microstructure sensing films.

关键词： robot shaped stress

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High resolution and high signal-to-noise ratio imaging with nearfield high-order optical signals

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nano Research 2022年第9期15卷 8345-8350页

作者： Fei Wang Shuming Yang Shaobo Li Shuhao Zhao Biyao Cheng Chengsheng Xia State Key laboratory for manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesXi’an Jiaotong UniversityXi’an 710049China School of Mechanical Engineering Xi’an Jiaotong UniversityXi’an 710049China

The properties of near-field optics have always been the focus of nano-measurement *** 11th order effective nearfield optical signal with an incident laser wavelength of 1,550 nm is obtained using a platinum-coated optical probe(Pt–Si probe).The experimental results show that the local electric field intensity of the Pt–Si probe is nearly 30 times higher than that of silicon probe(Si probe).Therefore,the highest 7th order near-field optical imaging results are obtained with the Pt–Si ***,near-field optical imaging is performed on samples such as gold grids and carbon nanotubes using the Pt–Si *** measurement results show that the high-order signal has the characteristics of less background,higher signal-to-noise ratio,and resolution up to 5.7 nm.

关键词： high-order optical signal local electric field enhancement high resolution optical probe

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nanometric Cutting Mechanism of Cerium-Lanthanum Alloy

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Chinese Journal of Mechanical Engineering 2023年第4期36卷 155-166页

作者： Chenyu Zhao Min Lai Fengzhou Fang State Key laboratory of Precision Measuring Technology&Instruments Laboratory of Micro/Nano Manufacturing Technology(MNMT)Tianjin UniversityTianjin 300072China Centre of micro/nano manufacturing Technology(MNMT-Dublin) University College DublinDublin 4Ireland

Cerium-lanthanum alloy is widely used in the green energy industry,and the nanoscale smooth surface of this material is in *** cutting is an effective approach to achieving the ultra-precision machining *** dynamics(MD)simulation is usually used to reveal the atomic-scale details of the material removal mechanism in nanometric *** this study,the effects of cutting speed and undeformed chip thickness(UCT)on cutting force and subsurface deformation of the cerium-lanthanum alloy during nanometric cutting are analyzed through MD *** results illustrate that the dislocations,stacking faults,and phase transitions occur in the subsurface during *** dislocations are mainly Shockley partial dislocation,and the increase of temperature and pressure during the cutting process leads to the phase transformation ofγ-Ce(FCC)intoβ-Ce(HCP)andδ-Ce(BCC).β-Ce is mainly distributed in the stacking fault area,whileδ-Ce is distributed in the boundary area between the dislocation atoms andγ-Ce *** cutting speed and UCT affect the distribution of subsurface damage.A thicker deformed layer including dislocations,stacking faults and phase-transformation atoms on the machined surface is generated with the increase in the cutting speed and ***,the cutting speed and UCT significantly affect the cutting force,material removal rate,and generated subsurface *** fluctuations in the cutting force are related to the generation and disappearance of *** research first studied the nanometric cutting mechanism of the cerium-lanthanum ally,providing a theoretical basis for the development of ultra-precision machining techniques of these materials.

关键词： Cerium-lanthanum alloy Molecular dynamics simulation nanometric cutting Subsurface damage

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