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Science China(Physics,Mechanics & Astronomy) 2015年第3期58卷 76-81页

作者： ding jianning CHEN MengJiao QIU JianHua YUAN NingYi Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou University Center for Low-Dimensional Materials Micro-Nano Devices and Systems Changzhou University Jiangsu Key Laboratory for Solar Cell Materials and Technology Changzhou University

To study the ferroelectric photovoltaic effect based on polycrystalline films, preparation of high-quality polycrystalline films with low leakage and high remnant polarization is essential. Polycrystalline BiFeO3 （BFO） thin films with extremely large remnant polarization （2Pr = 180 ~aC/cm2） were successfully deposited on glass substrates coated with indium tin oxide using a modified radio frequency magnetron sputtering method. Symmetric and asymmetric cells were constructed to investigate the ferroelectric photovoltaic effect in order to understand the relationship between polarization and photovoltaic response. All examined cells showed polarization-induced photovoltaic effect. Our findings also showed that the ferroelectric photovoltaic effect is highly dependent on the material used for the top electrode and the thickness of the polycrystalline film.

关键词： polycrystalline BiFeO3 photovoltaic effect ferroelectric solar cells Indium tin oxide substrate

Seed-assisted growth for high-performance perovskite solar cells:A review

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Journal of Energy Chemistry 2024年第9期96卷 588-610页

作者： Zhimin Fang Ting Nie jianning ding Shengzhong(Frank)Liu Institute of Technology for Carbon Neutralization Yangzhou UniversityYangzhou 225127JiangsuChina Dalian National Laboratory for Clean Energy iChEMDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710119ShaanxiChina

The rapid increase in the power conversion efficiency(PCE)of perovskite solar cells(PSCs)is closely related to the development of deposition techinique for perovskite *** high-quality perovskite film enables efficient charge transportation and less trap states,which are eventually translated into enhanced device ***-assisted growth(SAG)is a potential technique for depositing highly-crystallized perovskite films with preferential crystal orientation among the numerous approaches related to crystallization *** this review,we summarize the recent advances in the SAG technique for both one-step and two-step processed perovskite ***,seeding at the buried interface and on the top surface are also *** present different seeds and their corresponding seeding mechanism in detail,such as inorganic nanomaterials,organic ammoniums,alkali metal halides,and perovskite ***,challenges and perspectives are proposed to investigate the potential expansion of seeding engineering in high-performance PSCs,particularly large-area devices.

关键词： Perovskite solar cell Seed Crystallization Efficiency

Deformation and Locomotion of Untethered Small-Scale Magnetic Soft Robotic Turtle with Programmable Magnetization

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Journal of Bionic Engineering 2024年第2期21卷 754-763页

作者： Lin Xu Liu Yang Tao Li Xingbang Zhang jianning ding School of Mechanical Engineering Jiangsu UniversityZhenjiang212013China The Key Laboratory of Bionic Engineering(Ministry of Education) Jilin UniversityChangchun130012China Shanghai Tianchun Technology Co. LtdShanghai201802China School of Mechanical Engineering Yangzhou UniversityYangzhou225009China

Inspired by the way sea turtles rely on the Earth’s magnetic field for navigation and locomotion,a novel magnetic soft robotic turtle with programmable magnetization has been developed and investigated to achieve biomimetic locomotion patterns such as straight-line swimming and turning *** soft robotic turtle(12.50 mm in length and 0.24 g in weight)is integrated with an Ecoflex-based torso and four magnetically programmed acrylic elastomer VHB-based limbs containing samarium-iron–nitrogen particles,and was able to carry a load more than twice its own *** to the limb locomotion characteristics of sea turtles,the magnetic torque causes the four limbs to mimic sinusoidal bending deformation under the influence of an external magnetic field,so that the turtle swims continuously ***,when the bending deformation magnitudes of its left and right limbs differ,the soft robotic turtle switches from straight-line to turning swimming at 6.334 rad/***,the tracking swimming activities of the soft robotic turtle along specific planned paths,such as square-shaped,S-shaped,and double U-shaped maze,is anticipated to be utilized for special detection and targeted drug delivery,among other applications owing to its superior remote directional control ability.

关键词： Magnetic soft robotic turtle Programmable magnetization Untethered soft robotics Bending deformation

Thermocapillary migration mechanism of molten silicon droplets on horizontal solid surfaces

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Friction 2018年第1期6卷 62-74页

作者： Tao SUN Cunhua JIANG jianning ding Ningyi YUAN School of Mechanical Engineering Changzhou University Collaborative Innovation Center of Photovoltaic Science and Engineering the Breeding Construction Point of State Key Laboratory of Photovoltaic Engineering Science

Effective lubrication under extreme conditions such as high temperature is of considerable importance to ensure the reliability of a mechanical system. New lubricants that can endure high temperatures should be studied and employed as alternatives to traditional oil-based lubricant. In this paper, a thermocapillary model of a silicone-oil droplet is developed by solving the Navier–Stokes and energy equations to obtain the flow, pressure, and temperature fields. This is accomplished using a conservative microfluidic two-phase flow level set method designed to track the interface between two immiscible fluids. The numerical simulation accuracy is examined by comparing the numerical results with experimental results obtained for a silicone-oil droplet. Hence, the movement and deformation of molten silicon droplets on graphite and corundum are numerically simulated. The results show that a temperature gradient causes a tension gradient on the droplet surface, which in turn creates a thermocapillary vortex. As the vortex develops, the droplet migrates to the low-temperature zone. In the initial stage, the molten silicon droplet on the corundum substrate forms two opposite vortex cells, whereas two pairs of opposite vortices are formed in the silicone fluid on the graphite substrate. Multiple vortex cells gradually develop into a single vortex cell, and the migration velocity tends to be stable. The greater the basal temperature gradient, the stronger the internal thermocapillary convection of the molten silicon droplet has, which yields higher speeds.

关键词： molten silicon droplet temperature gradient thermocapillary migration

Energy storage for black start services:A review

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International Journal of Minerals,Metallurgy and Materials 2022年第4期29卷 691-704页

作者： Yanqi Zhao Tongtong Zhang Li Sun Xiaowei Zhao Lige Tong Li Wang jianning ding Yulong ding School of Mechanical Engineering Jiangsu UniversityZhenjiang 212013China Jiangsu Collaborative Innovation Centre of Photovoltaic Science and Engineering Changzhou UniversityChangzhou 213164China Birmingham Centre for Energy Storage&School of Chemical Engineering University of BirminghamBirmingham B152TTUnited Kingdom School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen 518055China Intelligent Control&Smart Energy(ICSE)Research Group&School of Engineering University of WarwickCoventry CV47ALUnited Kingdom School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China

With the increasing deployment of renewable energy-based power generation plants,the power system is becoming increasingly vulnerable due to the intermittent nature of renewable energy,and a blackout can be the worst *** current auxiliary generators must be upgraded to energy sources with substantially high power and storage capacity,a short response time,good profitability,and minimal environmental *** in the power restoration of renewable energy generators should also be *** different energy storage methods can store and release electrical/thermal/mechanical energy and provide flexibility and stability to the power ***,a review of the use of energy storage methods for black start services is provided,for which little has been discussed in the ***,the challenges that impede a stable,environmentally friendly,and cost-effective energy storage-based black start are *** energy storagebased black start service may lack supply ***,the typical energy storage-based black start service,including explanations on its steps and configurations,is *** start services with different energy storage technologies,including electrochemical,thermal,and electromechanical resources,are *** suggest that hybridization of energy storage technologies should be developed,which mitigates the disadvantages of individual energy storage methods,considering the deployment of energy storage-based black start services.

关键词： black start renewable energy electrochemical energy storage thermal energy storage electromechanical energy storage hybrid energy storage

Effect of Nd2O3 doping on the electrical properties of Ba0.96Ca0.04Ti0.90Sn0.10O3 ceramics

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Journal of Rare Earths 2018年第7期36卷 745-749页

作者： Zhihui Chen Zhiwei Li Minggang Ma Tianxiang Zhao Jianhua Qiu jianning ding School of Materials Science and Engineering Jiangsu Collaborative Innovation Center of Photovoltaic Science and EngineeringJiangsu Province Cultivation Base for State Key Laboratory of Photovoltaic Science and TechnologyChangzhou UniversityChangzhou 213164China Benxi Iron and Steel Company Limited Benxi 117100China

The Ba（0.96）Ca（0.04）Ti（0.90）Sn（0.10）O3-xNd2 O3（x = 0-0.08%） ceramics were prepared via traditional solid-state sintering method. The influences of Nd3＋ substitution on the phase structure, dielectric properties,piezoelectric and ferroelectric properties of the ceramics were investigated. All the samples possess pure BaTiO3-type perovskite structure. MPB with orthorhombic and tetragonal phase coexist at around x = 0.03-0.04. Nd^（3＋） doping decreases both Tc and T（O-T） to lower temperature. All the samples exhibit an intermediate state with the coexistence of ferroelectric and diffuse relaxor ferroelectric behavior with the addition of Nd^（3＋）. The electric properties of the ceramics were optimized at x = 0.03 with d33, Kp, εr and Pr values of 545 pC/N, 51.9%, 24,412 and 10.74 μC/cm^2.

关键词： Nd doped BCTS ceramics Piezoelectric properties Dielectric properties Ferroelectric properties Rare earths

MECHANICAL DEFLECTION OF POLYSILICON MICROCANTILEVER BEAMS USING NANOINDENTATION

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Chinese Journal of Mechanical Engineering 2000年第4期13卷 251-257页

作者： ding jianning Meng Yonggang Wen Shizhu (The National Tribology laboratory, Qinghua University) 清华大学摩擦学国家重点实验室北京

The validity of a novel, direct and convenient method for micromechanical property measurements by beam bending using a nanoindenter is demonstrated. This method combines a very high load resolution with a nanometric precision in the determination of the microcantilever beam deflection. The method is described clearly. In the deflection of microbeams, the influence of the indenter tip pushing into the top of the microbeams and the curvature across its width must be considered. The measurements were made on single-layer, micro-thick, several kinds of width and length polysilicon beams that were fabricated using conventional integrated circuit (IC) fabrication techniques. The elastic of a polysilicon microcantilever beam will vary linearly with the force and the deformation is thought to be elastic. Furthermore, it suggests that Young modulus of the beam can be determined from the slope of this linear relation. From the load deflection data acquired during bending the mechanical properties of the thin films were determined. Measured Young modulus is 137 GPa with approximately a ±2.9%～±6.3% difference in Young modulus.

关键词： Mechanical properties Micromechanical devices Thin films Polysilicon Nanoindentation

MECHANICAL PROPERTIES AND ANTI-WEARABILITY STUDIES OF MULTILAYER THIN COATINGS ON CUTTING TOOLS

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Chinese Journal of Mechanical Engineering 2000年第2期13卷 102-107页

作者： ding jianning Meng Yonggang win Shizhu (The National Tribology Laboratory, Qinghua University) 清华大学摩擦学国家重点实验室北京

The naniondentation fracture of multilayer hard coatings, such as TiN, TiN/Ti(C, N)/TiC, TiN/Ti (C,N)/TiC/Ti (C, N)/TiC and TiN/Ti (C, N)/TiC/Ti (C,N)/TiC/Ti(C,N)/TiC coating, deposited on cemented carbide using a CVD technique are studied. It is found that these coatings have high hardness. Based on the analysis of the energy release in cracking, the fracture toughness of these coatings are calculated. The observations clearly establish a step occurs in the force-displacement curves at the onset of coating fracture and a straight line segment in the load-penetration depth squared curves to idenntify the interfacial failure of coatings. The hardness, fracture toughness and anti-wearability of these coatings are clearly compared. The results show that with the layers increasing, the fracture toughness and anti-wearbility are getting larger.

关键词： Mechanical properties CVD Multilayer coatings Nanoindentation

Multi-functional stretchable and flexible sensor array to determine the location, shape, and pressure: Application in a smart robot

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Science China(Technological Sciences) 2018年第8期61卷 1137-1143页

作者： HAN LiBiao ding jianning WANG Shuai XU Jiang YUAN NingYi CHENG GuangGui LIU ZunFeng Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou University Micro/Nano Science and Technology Center Jiangsu University State Key Laboratory of Medicinal Chemical Biology Key Laboratory of Functional Polymer

The rapid increase in the aging population prompts the development of wearable devices and sophisticated robots. With their ability to collect complex information about their surroundings via e-skins, robots could perform more dynamic and variable tasks such as rescue missions or caring for the elderly. In this paper, we present a new concept of utilizing a very simple, highly flexible and stretchable capacitor sensor array, that can be attached on the surface of a retractable robot hand to realize three functions: determining the location, shape, and pressure of an object. This adaptive sensing system is accomplished using capacitors connected by aligned carbon nanotube(CNT) films constructed on an elastomer dielectric material, which can reduce the requirement on the accuracy of the machine vision system. This study has a very broad application in the manufacture of intelligent software robots.

关键词： sensor array stretchable location shape pressure

Photovoltaic molecules based on vinylene-bridged oligothiophene applied for bulk-heterojunction organic solar cells

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Journal of Energy Chemistry 2018年第2期27卷 426-431页

作者： Jing Zhang Pan Yin Linjun Xu Ping Shen Mingfu Ye Ningyi Yuan jianning ding School of Material Science & Engineering Jiangsu Collaborative Innovation Center of Photovoltaic Science & Engineering Changzhou University Changzhou 213164 Jiangsu China College of Chemistry and Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education Xiongtan University Xiangtan 411105 Hunan China School of Chemistry and Chemical Engineering Anhui University of Technology Maanshan 243002 Anhui China

We have synthesized two photovoltaic molecules（HEX-3TVT-ID and EH-3TVT-ID） based on vinylenebridged oligothiophene applied as donor for the solution-processable bulk-heterojunction organic solar cells（OSCs）. Vinylene unit was introduced as π-bridge in the oligothiophenes with 1,3-indenedione as end group and 4,4’-dihexyl-2,2’：5’,2’-terthiophene or 3’,4’-di（octan-3-yl）-2,2’：5’,2’-terthiophene as core,respectively. Due to the different substituent positions of the alkyl group relative to the vinylene unit in the terthiophene, HEX-3TVT-ID and EH-3TVT-ID show different optical and electrochemical properties, corresponding to the photovoltaic performance of the OSCs devices. The power conversion efficiency（PCE） of the OSCs based on a blend of HEX-3TVT-ID and PC71BM（1：0.8, weight ratio, 0.5% CN） reached 2.3%. In comparison, the OSCs based on the blend of EH-3TVT-ID and PC71BM in the weight ratio of 1：1 without the additive show a higher PCE of 2.7%, with a typically high VOC of 0.93 V, under the illumination of AM 1.5, 100 mW cm-2.

关键词： Organic solar cells Photovoltaic organic molecules Vinylene-bridged oligothiophene