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SmartMat 2022年第4期3卷 619-631页

作者： Xin Xia Haoyu Wang yunlong zi Department of Mechanical and Automation Engineering The Chinese University of Hong KongHong KongShatinN.T.China

Charge transfer mechanisms of contact electrification(CE)are essential for widening applications of the triboelectric nanogenerator,and thus are widely studied by scientists around the ***,the quantitative modeling of CE,especially that between polymers,is still ***,a model was proposed to describe the contributions from different mechanisms,including electron transfer and mass transfer in polymer/polymer CE through the fieldassisted thermionic emission,where three groups of charge transfer mechanisms were distinguished by the polarity of the charge transfer and the corresponding electric *** results indicated that the total generated charge in CE is actually much larger than the measured net surface charge,confirming the bidirectional material-dependent charge transfer mechanisms between two surfaces,which is meaningful for understanding the millennium puzzle in triboelectrification and provides a new perspective for promoting the applications to tailor surface charge generation.

关键词： charge-transfer mechanism contact electrification field-assisted thermionic emission quantitative modeling triboelectric effect

Recent progress on flexible nanogenerators toward self-powered systems

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InfoMat 2020年第2期2卷 318-340页

作者： Yiming Liu Lingyun Wang Ling Zhao Xinge Yu yunlong zi Department of Biomedical Engineering City University of Hong KongHong KongPeople's Republic of China Department of Mechanical and Automation Engineering Chinese University of Hong KongHong KongPeople's Republic of China

The advances in wearable/flexible electronics have triggered tremendous demands for flexible power sources,where flexible nanogenerators,capable of converting mechanical energy into electricity,demonstrate its great ***,recent progress on flexible nanogenerators for mechanical energy harvesting toward self-powered systems,including flexible piezoelectric and triboelectric nanogenerator,is *** emphasis is mainly on the basic working principle,the newly developed materials and structural design as well as associated typical applications for energy harvesting,sensing,and selfpowered *** addition,the progress of flexible hybrid nanogenerator in terms of its applications is also ***,the challenges and future perspectives toward flexible self-powered systems are reviewed.

关键词： flexible systems hybrid nanogenerator mechanical energy harvesting piezoelectric nanogenerator self-powered system triboelectric nanogenerator

Dynamics of triboelectric nanogenerators: A review

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International Journal of Mechanical System Dynamics 2022年第4期2卷 311-324页

作者： Guoqiang Xu Chuanyang Li Chaojie Chen Jingjing Fu Tingting Hou yunlong zi Department of Mechanical and Automation Engineering The Chinese University of Hong KongHong Kong SARChina Shenzhen Research Institute The Chinese University of Hong KongGuangdongShenzhenChina HKUST Shenzhen‐Hong Kong Collaborative Innovation Research Institute GuangdongShenzhenChina Thrust of Sustainable Energy and Environment The Hong Kong University of Science and Technology(Guangzhou)GuangdongGuangzhouChina Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and TechnologyHong Kong SARChina

Triboelectric nanogenerators(TENGs)represent a promising next‐generation renewable energy *** have become increasingly popular for harvesting vibration energy in the environment due to their advantages of lightweight,broad range of material choices,low cost,and no ***,issues such as input force irregularity,working bandwidth,efficiency calculation,and dynamic modeling hinder the use of TENGs in industrial or practical *** this paper,the modeling process of the dynamical system of a TENG is reviewed from the perspective of energy *** addition,this paper reviews the main contributions made in recent years to achieve optimized output based on springs,magnetic forces,and pendulums,and introduces different ways to increase the bandwidth of ***,the main problems of TENGs in the process of harvesting vibration energy are *** review may serve as a practical reference for methods to convert irregular mechanical input sources into optimized output performance toward the commercialization of TENGs.

关键词： triboelectric nanogenerator vibration energy harvesting electromechanical coupling model broad bandwidth

A metal-electrode-free, fully integrated, soft triboelectric sensor array for self-powered tactile sensing

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Microsystems & Nanoengineering 2020年第1期6卷 615-623页

作者： Lingyun Wang Yiming Liu Qing Liu Yuyan Zhu Haoyu Wang Zhaoqian Xie Xinge Yu yunlong zi Department of Mechanical and Automation Engineering The Chinese University of Hong KongShatinN.T.Hong Kong SARChina Department of Biomedical Engineering City University of Hong KongKowloonHong Kong SARChina Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHung HomHong Kong SARChina State Key Laboratory of Structural Analysis for Industrial Equipment International Research Center for Computational MechanicsDepartment of Engineering MechanicsDalian University of TechnologyDalian 116024China

The dramatic advances in flexible/wearable electronics have garnered great attention for touch sensors for practical applications in human health monitoring and human–machine ***-powered triboelectric tactile sensors with high sensitivity,reduced crosstalk,and simple processing routes are highly ***,we introduce a facile and low-cost fabrication approach for a metal-electrode free,fully integrated,flexible,and self-powered triboelectric tactile sensor array with 8-by-8 sensor *** the height difference between the sensor units and interconnect electrodes,the crosstalk derived from the electrodes has been successfully suppressed with no additional shielding *** tactile sensor array shows a remarkable sensitivity of 0.063VkPa^(–1) with a linear range from 5 to 50kPa,which covers a broad range of testing ***,due to the advanced mechanical design,the flexible sensor array exhibits great capability of pressure sensing even under a curved *** voltage responses from the pattern mapping by finger touching demonstrate the uniformity of the sensor ***,real-time tactile sensing associated with light-emitting diode(LED)array lighting demonstrates the potential application of the sensor array in position tracking,self-powered touch screens,human–machine interfaces and many others.

关键词： electrode sensor lighting

A fully self-powered, natural-light-enabled fiber-optic vibration sensing solution

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SusMat 2021年第4期1卷 593-602页

作者： Jiaqi Wang Ho-Yin Man Cuiling Meng Pengcheng Liu Shaoxin Li Hoi-Sing Kwok yunlong zi School of Marine Sciences Sun Yat-Sen UniversityZhuhaiGuangdongP.R.China Department of Mechanical and Automation Engineering The Chinese University of Hong KongShatinN.T.Hong KongP.R.China State Key Laboratory on Advanced Displays and Optoelectronics Technologies The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongP.R.China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijingP.R.China

Fiber-optic sensors have been developed to monitor the structural vibration with advantages of high sensitivity,immunity to electromagnetic interference(EMI),flexibility,and capability to achieve multiplexed or distributed ***,the current fiber-optic sensors require precisely polarized coherent lasers as the lighting sources,which are expensive in cost and suffer from the power supply issues while operating at outdoor *** work aims at solving these issues,through developing a fully self-powered,natural-light-enabled *** achieve that,a spring oscillator-based triboelectric nanogenerator(TENG),a polymer network liquid crystal(PNLC),and an optical fiber were *** external vibration drove the PNLC to switch its transparency,allowing the varia-tion of the incident natural light in the optical *** with the majority of conventional TENG-based active vibration sensors,the developed paradigm does not suffer from the EMI,without requirements of the signal preamplifica-tion which consumes additional *** vibration displacement monitoring was performed to validate the sensing effectiveness of the developed paradigm.

关键词： fiber-optics liquid crystal self-powered sensing triboelectric nanogenerators vibration sensing

Advanced insulating materials contributing to“carbon neutrality”:Opportunities,issues and challenges

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High Voltage 2022年第4期7卷 607-609页

作者： Chuanyang Li yunlong zi Yang Cao Giovanni Mazzanti Davide Fabiani Di Zhang Yunqi Xing Jinliang He State Key Laboratory of Power System Department of Electrical EngineeringTsinghua UniversityBeijing100084China Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and TechnologyClear Water BayHong Kong SARChina Electrical and Computer Engineering University of Connecticut371 Fairfield WayStorrsCT 06269USA Department Electrical Electronic and Information EngineeringUniversity of BolognaBologna 40136Italy Electrical and Computer Engineering Department Naval Postgraduate School1 University CircleMontereyCA 93943USA State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of TechnologyTianjin300131China

The vision of 2050 worldwide carbon-neutral ignites a revo-lution in all *** innovations in both electrical power equipment and electrified transportation assets are shaping our future energy *** materials,as the core element of energy infrastructure,are facing unprece-dented challenges that stand in the pathways to global carbon ***,researchers from both academic in-stitutions and industrial sections are working to turn the challenges into opportunities.

关键词： structure. neutral carbon

A nonlinear triboelectric nanogenerator with a broadened band-width for effective harvesting of vibration energy

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iEnergy 2022年第2期1卷 236-242页

作者： Guoqiang Xu Jingjing Fu Chuanyang Li Juntong Xing Chaojie Chen Wei-Hsin Liao Zhonglin Wang yunlong zi Department of Mechanical and Automation Engineering The Chinese University of Hong KongShatinN.T.Hong KongChina Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 100083China Shenzhen Research Institute The Chinese University of Hong KongGuangdong 518057China HKUST Shenzhen-Hong Kong Collaborative Innovation Research Institute Guangdong 518048China Thrust of Sustainable Energy and Environment The Hong Kong University of Science and Technology(Guangzhou)Guangdong 511400China Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and TechnologyClear Water BayHong KongChina

A narrow resonance bandwidth of an energy harvesters limits its response to the wide frequency spectrum in ambient *** work proposes an addition of a nonlinear restoring force applied to a triboelectric nanogenerator(TENG)to tune and broaden the resonance *** restoring force is applied by permanent magnets at both sides of the slider and two external *** noncontact strategy is adopted between the slider and the grating electrodes to avoid the wear of electrodes and energy loss caused by *** results show that compared with the linear system,the nonlinear noncontact TENG(NN-TENG)can increase the peak current from 6.3μA to 7.89μA,with an increment of about 25%,increase the peak power from 650μW to 977μW,increasing by about 50%,and increase the bandwidth from 0.5 Hz to 7.75 Hz,increasing by about1400%.This work may enable a new strategy to boost the bandwidth and output power of TENG through nonlinear oscillators.

关键词： Nonlinear oscillator triboelectric nanogenerator electromechanical coupling model energy harvester dynamic perfor-mance mechanical vibration

High-performance triboelectric nanogenerator based on theoretical analysis and ferroelectric nanocomposites and its high-voltage applications

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Nano Research Energy 2023年第3期2卷 25-37页

作者： Xuhua Guo Jianwei He Yang Zheng Junpeng Wu Caofeng Pan yunlong zi Hongzhi Cui Xiaoyi Li College of Materials Science and Engineering Ocean University of ChinaQingdao 266100China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China Sustainable Energy and Environment Thrust Hong Kong University of Science and TechnologyGuangzhou 510000China Key Lab for Special Functional Materials of Ministry of Education School of Materials Science and EngineeringHenan UniversityKaifeng 475004China

With the growing economy and technology,disease prevention and individual health are becoming more and more *** is highly urgent to develop a non-toxic,self-powered,and safe high-voltage power source to prevent diseases spread by mosquitoes,especially in isolated or remote ***,we reported a high-performance rotary triboelectric nanogenerator(R-TENG)based on customized theoretical simulations and a ferroelectric nanocomposite intermediate *** customized theoretical simulations based on gradient electrode gaps were established to optimize gap angles and segment numbers of the electrodes,which could prevent air breakdown and enhance the R-TENG output energy by at least 1.5 ***,the electrical output performance of the TENG was further enhanced with a highly oriented BaTiO3(BTO)nanoparticles intermediate layer by about 2.5 *** open-circuit voltage of R-TENG reached more than 6 kV and could continuously light 3420 light-emitting devices(LEDs)or 4 serially connected 36 W household fluorescent ***,a self-powered high-voltage disease prevention system is developed based on the high-performance R-TENG to reduce the risk of disease *** work provides a prospective strategy for the further development of TENGs and expands practical applications of self-powered and high-voltage systems.

关键词： triboelectric nanogenerator air-breakdown theoretical analysis ferroelectric nanocomposite high-voltage applications

Preface to the Special Issue on Flexible Energy Devices

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Journal of Semiconductors 2021年第10期42卷 1-2页

作者： Zhiyong Fan Yonghua Chen Yuanjing Lin yunlong zi Hyunhyub Ko Qianpeng Zhang Department of Electronic&Computer Engineering The Hong Kong University of Science and TechnologyHong Kong 999077China Institute of Advanced Materials Nanjing Tech UniversityNanjing 211816China School of Microelectronics Southern University of Science and TechnologyShenzhen 518055China Engineering Research Center of Integrated Circuits for Next-Generation Communications Ministry of EducationSouthern University of Science and TechnologyShenzhen 518055China Department of Mechanical and Automation Engineering The Chinese University of Hong KongHong Kong 999077China Energy and Chemical Engineering Ulsan National Institute of Science and TechnologyUlsan 44919Republic of Korea

Flexible energy devices are the building blocks for next-generation wearable *** energy devices are expected to have multiple functions,such as energy conversion from light to electricity and vice versa,energy generation from triboelectric,energy storage and so *** functions can be efficiently realized by solar cells,light-emitting diodes(LEDs),triboelectric nanogenerators(TENG),batteries and supercapacitors,*** flexible energy devices can be integrated into flexible,wearable,and/or portable platforms to enable wide application prospects in the fields of information,energy,medical care,national defense,***,flexible energy devices face more challenges when compared to their rigid counterparts,which requires more breakthroughs and research efforts on fabrication techniques,materials innovation,novel structure designs,and deep physical understandings.

关键词： breakthrough enable portable

An ultra thin,bright,and sensitive interactive tactile display based on organic mechanoluminescence for dual-mode handwriting identification

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InfoMat 2024年第6期6卷 76-87页

作者： Tingting Hou Wenlang Li Haoyu Wang Yuantian Zheng Chaojie Chen Haoran Zhang Kai Chen Huilin Xie Xin Li Shaoshuai He Siwei Zhang Dengfeng Peng Cheng Yang Jacky W.Y.Lam Ben Zhong Tang yunlong zi Department of Mechanical and Automation Engineering The Chinese University of Hong KongHong Kongthe People's Republic of China Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction and Institute for Advanced StudyThe Hong Kong University of Science and TechnologyHong Kongthe People's Republic of China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhenthe People's Republic of China Thrust of Sustainable Energy and Environment The Hong Kong University of Science and Technology(Guangzhou)Guangzhouthe People's Republic of China The Hong Kong University of Science and Technology Interdisciplinary Program Office Hong Kong SARthe People's Republic of China Institute of Materials Research Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhenthe People's Republic of China School of Science and Engineering Shenzhen Institute of Aggregate Science and TechnologyThe Chinese University of Hong KongShenzhenthe People's Republic of China HKUST Shenzhen-Hong Kong Collaborative Innovation Research Institute Shenzhenthe People's Republic of China Guangzhou HKUST Fok Ying Tung Research Institute Guangzhouthe People's Republic of China

Visible light-based human–machine interactive media is capable of transmitting electrical readouts to machines and providing intuitive feedback to users ***,many inorganic mechanoluminescent(ML)materials-based interactive media,typically ZnS-loaded phosphors(ZLPs),have been successfully ***,organic ML materials-based solutions were rarely exploited despite their huge merits of strong structural modification,abundant luminescence property,low cost,easy preparation,and so ***,we propose a novel interactive tactile display(ITD)based on organic ML materials(Cz-A6-dye)and triboelectric nanogenerator,with ultra-brightness(130%enhancement)and ultra-low threshold pressure(57%reduction)as compared to *** proposed ITD achieves the conversion of weak mechanical stimuli into visible light and electrical signals simultaneously,without extra power ***,the relationship between the luminous performance of organic ML materials and mechanical force is quantified,benefiting from the uniform ML layer *** by convolutional neural networks,the high-accuracy recognition(97.1%)for handwriting and identity of users is realized at the same ***,the ITD has great potential for intelligent wearable electronics and classified military applications.

关键词： interactive media organic mechanoluminescence triboelectric nanogenerators