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Commentary on the special topic: nanoenergy and nanosystem

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Science Bulletin 2015年第18期60卷 1626-1627页

作者： lijie li College of Engineering Swansea University

In the internationally renowned journal—Science China Technological Sciences—a good selection of articles dedicated to the field of micro-/nanotechnologies have reported several advanced technologies in nanoenergy and *** papers written with great care by international experts are targeting to address technical challenges in self-powered chaotic signal generators

关键词：纳米材料能源混沌信号发生器技术科学评论专题纳米技术研究人员

Piezotronic effect on the luminescence of quantum dots for micro/nano-newton force measurement

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Nano Research 2018年第4期11卷 1977-1986页

作者： Yan Zhang Jiaheng Nie lijie li School of Physical Electronics University of Electronic Science and Technology of China Chengdu 610054 China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences National Center for Nanoscience and Technology (NCNST) Beijing 100083 China Multidisciplinary Nanotechnology Centre College of Engineering Swansea University Swansea SA 1 8EN UK

The luminescence of semiconductor quantum dots （QDs） can be adjusted using the piezotronic effect. An external mechanical force applied on the QD generates a piezoelectric potential, which alters the luminescence of the QD. A small mechanical force may induce a significant change on the emission spectrum. In the case of InN QDs, it is demonstrated that the unforced emission wavelength is more than doubled by a force of 1 μN. The strategy of using the piezotronic effect to tune the color of the emission leads to promising noncontact force- measurement applications in biological and medical sensors and force-sensitive displays. Several piezoelectric semiconductor materials have been investigated in terms of the tunability of the emission wavelength in the presence of an external applied force. It is found that CdS and CdSe demonstrate much higher tunability δλ/δF, which makes them suitable for micro/nano-newton force measurement applications.

关键词： piezotronic effect quantum dot (QD) luminescence force measurement

Modeling the open circuit output voltage of piezoelectric nanogenerator

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Science China(Technological Sciences) 2013年第11期56卷 2622-2629页

作者： HUANG Xin li lijie ZHANG Yan Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Multidisciplinary Nanotechnology Centre College of Engineering Swansea University Institute of Theoretical Physics Lanzhou University

Piezoelectric nanogenerators(NGs)have been developed for converting mechanical energy into electric energy using ZnO,GaN,ZnSnO3,and PZT *** to the unique polarity and non-central symmetry of the wurtzite structure,a composite made of using the conical shaped nanowires are used as a simple,cost-effective,and scalable *** on the finite element methods,the output voltage of the nanogenerator is modeled *** key factors:the spatial location of nanowires,length and dip angle of nanowires,thickness of NG devices,and the physical properties of the polymer inside NGs,which affect the output voltage are *** results provide guidance for optimization the output of piezoelectric nanogenerators.

关键词： piezoelectric nanogenerator model conical nanowire open circuit output voltage

IoT-Based Cost Saving Offloading System for Cellular Networks

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Tsinghua Science and Technology 2017年第4期22卷 379-388页

作者： Zhuojun Duan Mingyuan Yan Qilong Han lijie li Yingshu li Department of Computer Science Georgia State University Department of Computer Science and Information Systems University of North Georgia the College of Computer Science and Technology Harbin Engineering University

Nowadays, with the new techniques available in hardware and software, data requests generated by applications of mobile devices have grown explosively. The large amount of data requests and their responses lead to heavy traffic in cellular networks. To alleviate the transmission workload, offloading techniques have been proposed, where a cellular network distributes some popular data items to other wireless networks, so that users can directly download these data items from the wireless network around them instead of the cellular *** this paper, we design a Cost Saving Offloading System（CoSOS）, where the Internet of Things（IoT） is used to undertake partial data traffic and save more bandwidth for the cellular network. Two types of algorithms are proposed to handle the popular data items distribution among users. The experimental results show that CoSOS is useful in saving bandwidth and decreasing the cost for cellular networks.

关键词： Internet of Things(IoT) cellular networks cost minimization

A Cu/ZnO Nanowire/Cu Resistive Switching Device

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Nano-Micro Letters 2013年第3期5卷 159-162页

作者： lijie li Yan Zhang Zhengjun Chew Multidisciplinary Nanotechnology Centre College of Engineering Swansea University Wuhan University of Technology Institute of Theoretical Physics Lanzhou University Beijing Institute of Nanoengergy and Nanosystem Chinese Academy of Science

A new device has been realized using flip-chip joining two printed circuit boards(PCBs) on which zinc oxide(ZnO) nanowires were synthesized. Energy dispersive X-ray measurement has been conducted for the ZnO nanowires, confirming that Cu elements have been diffused into the nanowires during the chemical growth process. From I-V measurements, this Cu/ZnO nanowire/Cu structure exhibits a resistive tuning behaviour, which varies greatly with the frequency of the applied sinusoidal source.

关键词： Cu/ZnO Nanowires Flip-chip Resistive switching Device

Morphology prediction of dihydroxylammonium 5,5'-bistetrazole-1,1'-diolate (TKX-50) crystal in different solvent systems using modified attachment energy model

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Chinese Journal of Chemical Engineering 2023年第1期53卷 181-193页

作者： Fang Chen Tao Zhou lijie li Chongwei An Jun li Duanlin Cao Jianlong Wang School of Chemical Engineering and Technology North University of ChinaTaiyuan 030051China School of Material Science and Engineering Beijing Institute of TechnologyBeijing 100081China School of Environmental and Safety Engineering North University of ChinaTaiyuan 030051China

In order to theoretically study the growth morphology of dihydroxylammonium 5,5’-bistetrazole-1,1’-dio late(TKX-50)crystal in different solvent systems,crystal–solvent models were established,and then molecular dynamics(MD)methods were adopted as a means to simulate particle *** attachment energy(MAE)model was employed to calculate the growth morphology of *** simulation results demonstrate that COMPASS force field and RESP charge are suitable for molecular dynamics simulation of *** morphologically dominant growth surfaces of TKX-50 in vacuum are(020),(011),(11–1),(100)and(120),*** water(H_(2)O)and N,N-dimethylformamide(DMF)solvents,the(11–1)face is the largest in the habit face,the growth rate of(020)face becomes *** the increase of temperature,the aspect ratios of TKX-50 crystal in DMF solvent increase,and the areas of the(120)faces *** ethylene glycol/H_(2)O mixed solvent system with volume ratio of 1/1,aspect ratio of TKX-50 is relatively *** formic acid/H_(2)O mixed solvents with different volume ratios(1/4,1/3,1/2,1/1 and 2/1),aspect ratio of TKX-50 is relatively small when volume ratio is 1/2.

关键词： TKX-50 Crystal morphology Solvents Modified attachment energy model Molecular dynamics simulation

A GENERAliZED PENALTY METHOD FOR DIFFERENTIAL VARIATIONAL-HEMIVARIATIONAL INEQUAliTIES

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Acta Mathematica Scientia 2022年第1期42卷 247-264页

作者： liang LU lijie li Mircea SOFONEA Guangxi Key Laboratory of Cross-border E-commerce Intelligent Information Processing Guangxi University of Finance and EconomicsNanning 530003China Guangxi Colleges and Universities Key Laboratory of Complex System Optimization and Big Data Processing Yulin Normal UniversityYulin 537000China Laboratoire de Mathématiques et Physique Universitéde Perpignan Via Domitia52 Avenue Paul Alduy66860 PerpignanFrance

We consider a differential variational-hemivariational inequality with constraints,in the framework of reflexive Banach *** existence of a unique mild solution of the inequality,together with its stability,was proved in[1].Here,we complete these results with existence,uniqueness and convergence results for an associated penalty-type *** this end,we construct a sequence of perturbed differential variational-hemivariational inequalities governed by perturbed sets of constraints and penalty *** prove the unique solvability of each perturbed inequality as well as the convergence of its solution to the solution of the original ***,we consider a mathematical model which describes the equilibrium of a viscoelastic rod in unilateral *** weak formulation of the model is in a form of a differential variational-hemivariational inequality in which the unknowns are the displacement field and the history of the *** apply our abstract penalty method in the study of this inequality and provide the corresponding mechanical interpretations.

关键词： differential variational-hemivariational inequality generalized penalty method Mosco convergence viscoelastic rod unilateral constraint

A combined multiscale modeling and experimental study on surface modification of high-volume micro-nanoparticles with atomic accuracy

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International Journal of Extreme Manufacturing 2022年第2期4卷 129-144页

作者： Zoushuang li Junren Xiang Xiao liu Xiaobo li lijie li Bin Shan Rong Chen State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and Technology1037 Luoyu RoadWuhanHubei 430074People’s Republic of China School of Energy and Power Engineering Huazhong University of Science and TechnologyWuhanHubei 430074People’s Republic of China College of Engineering Swansea UniversitySA18EN SwanseaUnited Kingdom State Key Laboratory of Material Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanHubei 430074People’s Republic of China Wuhan University of Technology WuhanHubei 430063People’s Republic of China

Surface modification for micro-nanoparticles at the atomic and close-to-atomic scales is of great importance to enhance their performance in various applications,including high-volume battery,persistent luminescence,*** bed atomic layer deposition(FB-ALD)is a promising atomic-scale manufacturing technology that offers ultrathin films on large amounts of particulate ***,nanoparticles tend to agglomerate due to the strong cohesive forces,which is much unfavorable to the film conformality and also hinders their real *** this paper,the particle fluidization process in an ultrasonic vibration-assisted FB-ALD reactor is numerically investigated from micro-scale to macro-scale through the multiscale computational fluid dynamics and discrete element method(CFD-DEM)modeling with experimental *** vibration amplitudes and frequencies are investigated in terms of their effects on the fluid dynamics,distribution of particle velocity and solid volume fraction,as well as the size of *** show that the fluid turbulent kinetic energy,which is the key power source for the particles to obtain the kinetic energy for overcoming the interparticle agglomeration forces,can be strengthened obviously by the ultrasonic ***,the application of ultrasonic vibration is found to reduce the mean agglomerate size in the *** is bound to facilitate the heat transfer and precursor diffusion in the entire FB-ALD reactor and the agglomerates,which can largely shorten the coating time and improve the film conformality as well as precursor *** simulation results also agree well with our battery experimental results,verifying the validity of the multiscale CFD-DEM *** work has provided momentous guidance to the mass manufacturing of atomic-scale particle coating from lab-scale to industrial applications.

关键词： atomic scale manufacturing fluidized bed atomic layer deposition(FB-ALD) computational fluid dynamics and discrete element method(CFD-DEM) nanoparticle agglomerates ultrasonic vibration

Fast charge transport motivated by tunable Mo2C/Mo2N high-quality heterointerface for superior pseudocapacitive storage

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Journal of Energy Chemistry 2023年第8期83卷 465-477,I0012页

作者： Yanjun Gao Shaohua Zhang lingrui Xu Xiangyang li lijie li lixia Bao Jiong Peng Xin li School of Chemistry and Chemical Engineering Beijing Institute of TechnologyBeijing 100081China School of Material Science and Engineering Beijing Institute of TechnologyBeijing 100081China Analysis&Testing Center Beijing Institute of TechnologyBeijing 100081China

The development of potential transition-metal carbide/nitride heterojunctions is hindered by overall understanding and precise modulation for heterointerface ***,we demonstrate that Mo_(2)C/Mo_(2)N heterojunction with the precisely regulated high-quality interface can achieve marvelous rate performance and energy output via enlarging the interface-effect range and maximizing "accelerated charge" amount The heterointerface mechanism improving properties is synergistically revealed from kinetics and thermodynamics *** analysis confirms that the self-built electric field affords a robust force to drive rapid interface electrons/ions *** small adsorption energy,high density of states and quite low diffusion barrier thermodynamically enhance the electrochemical reaction dynamics on ***,the almost optimal performance of ultrahigh capacitance retention(85.6% even at 10 A g^(-1)) and pronounced energy output(96.4 Wh kg^(-1))in hybridsupercapacitors than other Mo_(2)C/Mo_(2)N-based materials is *** work gives new insight into the energy storage mechanism of heterojunction and guides the design of advanced electrodes.

关键词： Energy storage Hybrid supercapacitors Pseudocapacitance Heterojunction High-quality interface