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Influence of external electric field on piezotronic effect in ZnO nanowires

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Nano Research 2015年第7期8卷 2390-2399页

作者： Fei Xue Limin Zhang Xiaolong Feng Guofeng Hu Feng Ru Fan Xiaonan Wen Li Zheng zhong lin wang Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing 100083 China School of Material Science and Engineering Georgia Institute of Technology Atlanta Georgia 30332 USA

In this work, the piezotronic effect is investigated for the first time in external electric fields ranging from 0 V·cm-I to 2,000 V·cm-1 by using n-type ZnO nanowires supported by a flexible substrate. In the presence of an external electric field, the Schottky barrier height （SBH） is lowered by the image force, allowing more free carriers to pass through the metal-semiconductor junction and enhancing the screening effect on positive piezoelectric polarization charges. As the strength of the external electric field increases, the piezotronic effect is significantly suppressed and the metal-semiconductor contact finally exhibits Ohmic behavior. The experimental results show that devices can be classified into three groups, corresponding to low, moderate, and high carrier densities of the nanowires used. This work not only helps us to explicate the basic physical mechanism of the piezotronic effect in a harsh environment in an electric field but also provides guidelines for future design and fabrication of piezotronic devices.

关键词： piezotronic effect,external electric field,ZnO nanowires

Cordyceps cicadae extracts ameliorate renal malfunction in a remnant kidney model

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第12期12卷 1024-1033页

作者： Rong ZHU Yi-ping CHEN Yue-yi DENG Rong ZHENG Yi-fei zhong lin wang Lan-ping DU Department of Nephrology Longhua Hospital Shanghai University of Traditional Chinese Medicine Shanghai 200032 China

Background and Objectives:Chronic kidney disease(CKD) is a growing public health problem with an urgent need for new pharmacological *** cicadae is widely used in traditional Chinese medicine(TCM) and has potential renoprotective *** current study aimed to determine any scientific evidence to support its clinical ***:We analyzed the potential of two kinds of *** extract,total extract(TE) and acetic ether extract(AE),in treating kidney disease simulated by a subtotal nephrectomy(SNx) ***-Dawley rats were divided randomly into seven groups:sham-operated group,vehicle-treated SNx,Cozaar,2 g/(kg·d) TE SNx,1 g/(kg·d) TE SNx,92 mg/(kg·d) AE SNx,and 46 mg/(kg·d) AE *** injury was monitored using urine and serum analyses,and hematoxylin and eosin(HE) and periodic acid-Schiff(PAS) stainings were used to analyze the level of *** expression of type IV collagen(Col IV),fibronectin(FN),transforming growth factor-β1(TGF-β1),and connective tissue growth factor(CTGF) was detected by ***:Renal injury,reflected in urine and serum analyses,and pathological changes induced by SNx were attenuated by TE and AE *** depositions of Col IV and FN were also decreased by the treatments and were accompanied by reduced expression of TGF-β1 and *** some respects,2 g/(kg·d) of TE produced better effects than ***:For the first time,we have shown that *** may inhibit renal fibrosis in vivo through the TGF-β1/CTGF ***,we conclude that the use of *** could provide a rational strategy for combating renal fibrosis.

关键词： Chronic kidney disease Cordyceps cicadae TGF-β Traditional Chinese medicine

Mechanoluminescent hybrids from a natural resource for energy-related applications

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InfoMat 2021年第11期3卷 1272-1284页

作者： Chunfeng wang Ronghua Ma Dengfeng Peng Xianhu Liu Jing Li Boru Jin Aixian Shan Yu Fu lin Dong Wenchao Gao zhong lin wang Caofeng Pan Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhenChina CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijingChina Key Laboratory of Materials Processing and Mold(Ministry of Education) Henan Key Laboratory of Diamond Optoelectronic Materials and DevicesKey Laboratory of Material PhysicsMinistry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhouChina Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface ScienceSchool of Mathematics and PhysicsUniversity of Science and Technology BeijingBeijingChina Department of Civil Engineering Monash UniversityClaytonAustralia

Mechanoluminescent(ML)materials that directly convert mechanical energy into photon emission have emerged as promising candidates for various *** the recent advances in the development of both novel and conventional ML materials,the limited access to ML materials that simultaneously have the attributes of high brightness,low cost,self-recovery,and stability,and the lack of appropriate designs for constructing ML devices represent significant challenges that remain to be addressed to boost the practical application of ML ***,ML hybrids derived from a natural source,waste eggshell,with the aforementioned attributes are *** introduction of the eggshell not only enables the preparation of the hybrid in a simple and cost-effective manner but also contributes to the homochromatism(red,green,or blue emission),high brightness,and robustness of the resultant ML *** significant properties of the ML hybrids,together with the proposed structural design,such as porosity or core–shell structure,could expedite a series of mechanic-optical applications,including the self-luminous shoes for the conversion of human motions into light and light generators that efficiently harvest water wave *** fascinating properties,versatile designs,and the efficient protocol of“turning waste into treasure”of the ML hybrids represent significant advances in ML materials,promising a leap to the practical applications of this flouring material family.

关键词： blue energy harvesting eggshell waste mechanoluminescent hybrids smart sensing

Self-powered electrochromic devices with tunable infrared intensity

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Science Bulletin 2018年第12期63卷 795-801页

作者： Jiangman sun xiong pu Chunyan Jiang Chunhua Du Mengmeng Liu Yang Zhang Zhitian Liu Junyi Zhai Weiguo Hu zhong lin wang 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.Beijing 100083.China School of Nanoscience and Technology.University of Chinese Academy of Sciences.Beijing 100049.China School of Materials Science and Engineering.Georgia Institute of Technology Atlanta.GA 30332-0245.USA Wuhan Institute of Technology Materials Science and Engineering.Wuhang 430205 China

Triboelectric nanogenerator （TENG） is an efficient way to convert ambient mechanical energy into electricity to power up portable electronics. In this work, a flexible inflared electrochromical device （IR-ECD） with stable performances was assembled with a TENG for building self-powered infrared detector with tunable intensity. As driven by TENG, the electrochromic device could be operated in the mid-lR region due to the reversible electrochromic reactions. An average infrared reflectance contrast of 46% was achieved in 8-14 μm regions and as well a clear thermal image change can be observed. This work indicates that the TENG-driven infrared electrochromical device has potential for use in self-powered camouflage and tbermal control.

关键词： Infrared electrochromical device Triboelectric nanogenerator Self-powered Flexible Thermal control

High-Voltage and Fast-Charging Lithium Cobalt Oxide Cathodes: From Key Challenges and Strategies to Future Perspectives

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Engineering 2024年第6期37卷 105-127页

作者： Gongrui wang Zhihong Bi Anping Zhang Pratteek Das Hu lin zhong-Shuai Wu State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Dalian National Laboratory for Clean Energy Chinese Academy of SciencesDalian 116023China

Lithium-ion batteries(LIBs)with the“double-high”characteristics of high energy density and high power density are in urgent demand for facilitating the development of advanced portable ***,the lithium ion(Li+)-storage performance of the most commercialized lithium cobalt oxide(LiCoO_(2),LCO)cathodes is still far from satisfactory in terms of high-voltage and fast-charging capabilities for reaching the double-high ***,we systematically summarize and discuss high-voltage and fast-charging LCO cathodes,covering in depth the key fundamental challenges,latest advancements in modification strategies,and future perspectives in this *** and elaborated discussions are first presented on key fundamental challenges related to structural degradation,interfacial instability,the inhomogeneity reactions,and sluggish interfacial *** provide an instructive summary of deep insights into promising modification strategies and underlying mechanisms,categorized into element doping(Li-site,cobalt-/oxygen-site,and multi-site doping)for improved Li+diffusivity and bulkstructure stability;surface coating(dielectrics,ionic/electronic conductors,and their combination)for surface stability and conductivity;nanosizing;combinations of these strategies;and other strategies(i.e.,optimization of the electrolyte,binder,tortuosity of electrodes,charging protocols,and prelithiation methods).Finally,forward-looking perspectives and promising directions are sketched out and insightfully elucidated,providing constructive suggestions and instructions for designing and realizing high-voltage and fast-charging LCO cathodes for next-generation double-high LIBs.

关键词： Lithium cobalt oxide High energy/power density Fast-charging High-voltage Lithium-ion battery

Self-powered nanofiber-based screen-print triboelectric sensors for respiratory monitoring

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Nano Research 2018年第7期11卷 3771-3779页

作者： Ran Cao diaona wang Shuyu Zhao Wei Yang Zuqing Yuan Yingying Yin Xinyu Du Nian-Wu Li Xiuling Zhang Xiuyan Li zhong lin wang Congju Li Beijing Institute of Nanoenergy and Nonosystems Chinese Academy of Sciences National Center for Nanoscience and Technology (NCNST) Beijing 100083 China School of Materials Science & Engineering Beijing Institute of Fashion Technology Beijing 100029 China School of Material Science and Engineering Georgia Institute of Technology Atlanta Georgia 30332-0245 USA

Scientific and commercial advances have set high requirements for wearable electronics. However, the power supply, breathability, and mass production of wearable electronics still have many challenges that need to be overcome. In this study, a self-powered nanofiber-based triboelectric sensor （SNTS） was fabricated by batch-scale fabrication technologies using electrospinning and screen-printing for health monitoring via respiratory monitoring. Typically, an arch structural SNTS is assembled by a nanofiber membrane and a Ag nanoparticle electrode. The pile of nanofibers and the conductive network of Ag nanoparticles ensure a gas channel across the whole device. The gas permeability of the SNTS was as high as 6.16 mm/s, which has overwhelming advantages when compared with commonly used wearable devices composed of air-tight cast films. Due to the softness of the nanofiber membrane, the SNTS showed excellent electronic output performance irrespective of whether it was bent, twisted, or folded. The superior properties, such as breathability, skin-friendliness, self-power, and batch fabrication of SNTS offer huge potential for their application in healthcare monitoring and multifunctional intelligent systems.

关键词： self-powered nanofiber membrane air-permissive triboelectric sensor screen-print health monitoring

Intrinsically Stretchable Organic-Tribotronic-Transistor for Tactile Sensing

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Research 2020年第1期2020卷 60-69页

作者： Junqing Zhao Tianzhao Bu Xiaohan Zhang Yaokun Pang Wenjian Li Zhi Zhang Guoxu Liu zhong lin wang Chi Zhang CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-Nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 100083China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China School of Material Science and Engineering Georgia Institute of Technology AtlantaGA 30332USA Center on Nanoenergy Research School of Physical Science and TechnologyGuangxi UniversityNanning 530004China

Stretchable electronics are of great significance for the development of the next-generation smart interactive ***,we propose an intrinsically stretchable organic tribotronic transistor(SOTT)without a top gate electrode,which is composed of a stretchable substrate,silver nanowire electrodes,semiconductor blends,and a nonpolar elastomer *** drain-source current of the SOTT can be modulated by external contact electrification with the dielectric *** 0-50%stretching both parallel and perpendicular to the channel directions,the SOTT retains great output *** being stretched to 50%for thousands of cycles,the SOTT can survive with excellent ***,the SOTT can be conformably attached to the human hand,which can be used for tactile signal perception in human-machine interaction and for controlling smart home devices and *** work has realized a stretchable tribotronic transistor as the tactile sensor for smart interaction,which has extended the application of tribotronics in the human-machine interface,wearable electronics,and robotics.

关键词： drain smart dielectric

SCALE EFFECT OF I MPINGING PRESSURE CAUSED BY SUBMERGED JET

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Journal of Hydrodynamics 2005年第4期17卷 478-482页

作者： TIAN zhong XU Wei-lin wang Wei LIU Shan-jun DONG Jian-wei State Key Hydraulics Laboratory of High Speed Flows Sichuan University Chengdu 610065 China Military Oil Supply Engineering Department Logistical Engineering University Chongqing 400016China

The characteristics of the impinging pressure at the jet equipment where the maximum jet velocity can reach 50m/s were studied. By comparing the impinging pressure with the one measured at the low velocity conditions, two conclusions of the scale effect are drawn： firstly, the velocity attenuation degree is smaller than that of low velocity jet, and secondly, the relative impinging width is narrower than that of low-velocity jet. The reasons of the scale effect of the impinging pressure were elucidated through numerical simulation.

关键词： scale effect impinging pressure high-velocity jet numerical simulation

Integrative square-grid triboelectric nanogenerator as a vibrational energy harvester and impulsive force sensor

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Nano Research 2018年第2期11卷 1157-1164页

作者： Chuan He Weijun Zhu Guang Qin Gu Tao Jiang Liang Xu Bao Dong Chen Chang Bao Han Dichen Li zhong lin wang Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing China CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology (NCNST) Beijing China State Key Laboratory of Manufacturing Systems Engineering Xi’an Jiaotong University Xi’an China Collaborative Innovation Center of High-End Manufacturing Equipment Xi’an Jiaotong University Xi’an China University of Chinese Academy of Sciences Beijing China School of Materials Science and Engineering Georgia Institute of Technology Atlanta USA

A square-grid triboelectric nanogenerator （SG-TENG） is demonstrated for harvesting vibrational energy and sensing impulsive forces. Each square of the three-dimensional （3D）-printed square grid is filled with an aluminum （A1） ball. The grid structure allows the SG-TENG to harvest vibrational energy over a broad bandwidth and operate at different vibrational angles. The most striking feature of the SG-TENG is its ability of being scaled and integrated. After connecting two SG-TENGs in parallel, the open-circuit voltage and short-circuit current are significantly increased over the full vibrational frequency range. Being integrated with a table tennis racket, the SG-TENG can harvest the vibrational energy from hitting a ping pong ball using the racket, where a direct hit by the racket generates an average output voltage of 10,9 ~ 0.6 V and an average output current of 0.09 ± 0.02 boA. Moreover, the SG-TENG integrated into a focus mitt can be used in various combat sports, such as boxing and taekwondo, to monitor the frequency and magnitude of the punches or kicks from boxers and other practitioners. The collected data allow athletes to monitor their status and improve their performance skills. This work demonstrates the enormous potential of the SG-TENG in energy harvesting and sensing applications.

关键词： square grid triboelectric nanogenerator vibration sensor