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Morphology and Crystallinity-controlled Synthesis of Manganese Cobalt Oxide/Manganese Dioxides Hierarchical nanostructures for High-Performance Supercapacitors

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功能材料信息 2015年第4期12卷 17-32页

作者： Fei Li Gang Li Hao Chen Jia Qi Jia Fan Dong Yao Bo Hu Zheng Guo Shang 张育新 College of Materials Science and Engineering Chongqing University State Key Laboratory of Porous Metal Materials Northwest Institute for Nonferrous Metal Research Chongqing Key Laboratory of Catalysis and Functional Organic Molecules College of Environmental and Biological Engineering Chongqing Technology and Business University National Key Laboratory of Fundamental Science of Micro Nano-Devices and System TechnologyChongqing University 重庆大学材料学院

We demonstrate a novel preparative strategy for the well-controlled MnCo_2O_(4.5)@MnO_2 hierarchical ***δ-MnO_2 nanosheets andα-MnO_2 nanorods can uniformly decorate the surface of MnCo_2O_(4.5)nanowires to form core-shell *** electrochemical characterization reveals that MnCo_2O_(4.5)@δ-MnO_2 pattern exhibits not only high specific capacitance of 357.5 F g^(-1)at a scan rate of 0.5 A g^(-1),but also good cycle stability(97%capacitance retention after 1000 cycles at a scan rate of 5 A g^(-1)),which make it have a promising application as a supercapacitor electrode material.

关键词： MnO2 Manganese cobalt oxide Chemical synthesis Core-shell nanostructures Supercapacitor

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LONGITUDINAL WAVE RESONANT FREQUENCY CALCULATION AND VERIFICATION OF THE BULK ACOUSTIC RESONATOR

LONGITUDINAL WAVE RESONANT FREQUENCY CALCULATION AND VERIFIC...

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2013 5th IEEE International Conference on Broadband Network & Multimedia technology

作者： Yi HE Yang GAO Bin ZHOU Junru LI School of Information Engineering Southwest University of Science and Technology Institute of Electronic Engineering China Academy of Engineering Physics National Key Laboratory of Fundamental Science of Micro/Nano-Device and System Technology Chongqing University

ISBN: (纸本)9781479900961

Thickness and material of electrode, piezoelectric and supporting layer film of the Film Bulk Acoustic Resonator (FBAR) are main influence factors of resonant frequency, desired resonance frequency can be achieved by confirming thickness and material. A formula about thickness, material, frequency parameter and angular frequency has been achieved by deriving stress-equation of motion in longitudinal wave of film bulk acoustic resonator;frequency parameter has been get from Newton iteration of determinant of stress and displacement boundary conditions, continuity equations simulated by MATLAB. The resonant frequency of a certain FBAR whose thickness, material and frequency parameter are determined has been calculated by the formula, and the calculation value is 1.441 GHz. Equivalent circuit of longitudinal vibration Mason model which has the same thickness, material with formula calculation has been simulated by ADS, and resonant frequency of simulation model is 1.473GHz. Verification simulation of equivalent circuit of longitudinal vibration Mason model shows: resonant frequency calculation value by formula and the simulation value of model are very close, and we can use the formula to calculate longitudinal wave resonance frequency of FBAR.

关键词： FBAR resonant frequency Newton iteration Mason model ADS simulation

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Efficient terahertz generation from van der Waalsα-In_(2)Se_(3)

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Chinese Optics Letters 2024年第1期22卷 141-146页

作者：段诗婕杨鸣周溯媛张隆辉韩锦森孙旭王广刘昌勤康冬冬王小伟陈家浩戴佳钰 Department of Physics College of ScienceNational University of Defense TechnologyChangsha 410073China Hunan Key Laboratory of Extreme Matter and Applications(XMAL) Changsha 410073China Hunan Key Laboratory for Micro-Nano Energy Materials and Devices School of Physics and OptoelectronicsXiangtan UniversityXiangtan 411105China Guangxi Key Laboratory of Automatic Detecting Technology and Instrument Guilin University of Electronic TechnologyGuilin 541004China

Two-dimensional(2D)van der Waals materials have attracted tremendous attention due to their versatile physical properties and flexible manipulation *** the various types of van der Waals materials,α-In_(2)Se_(3)is remarkable for its intrinsic 2D ferroelectricity and high-performance opto-electronic ***,the study of theα-In_(2)Se_(3)system in terahertz(THz)radiation is scarce,although it is promising for electrically controlled THz field *** investigate theα-In_(2)Se_(3)in different thicknesses and report that the THz generation efficiency induced by femtosecond laser pulses can be largely improved by reducing the thickness from the ***,we reveal the surge current in thin film coupled with THz emission exhibits a different Auger recombination mode,which is helpful in understanding the mechanism and provides insights into the design of 2D highly efficient THz devices.

关键词： van der Waals terahertz carrier dynamics

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Diatoms silica: An emerging biomaterial for energy conversion and storage

Diatoms silica: An emerging biomaterial for energy conversio...

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第二届中国（国际）能源材料化学研讨会

作者： Tian Wang Qiujian Le Yuxin Zhang Dusan Losic College of Materials Science and Engineering Chongqing University National Key Laboratory of Fundamental Science of Micro/Nano-Devices and SystemTechnology Chongqing University School of Chemical Engineering The University of Adelaide

We would like to introduce diatom as a novel substrate of electrode material for supercapacitor,which is actually the amorphous silica exoskeletons(frustules)of the single-celled algae and known as a common building *... 详细信息

关键词： An emerging biomaterial for energy conversion and storage Diatoms silica

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Facile synthesis of ironenickelecobalt ternary oxide(FNCO)mesoporous nanowires as electrode material for supercapacitor application

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Journal of Materiomics 2022年第1期8卷 221-228页

作者： Muhammad Usman Muhammad Tayyab Ahsan Sofia Javed Zeeshan Ali Yiqiang Zhan Irfan Ahmed Sajid Butt Mohammad Islam Asif Mahmood M.Aftab Akram School of Chemical and Materials Engineering National University of Sciences and Technology(NUST)Sector H-12Islamabad44000Pakistan Department of Materials Science and Engineering College of EngineeringPeking University100871BeijingChina State Key Laboratory of ASIC and System Center of Micro-Nano SystemSISTFudan UniversityShanghai200433China Department of Materials Science and Engineering Institute of Space TechnologyIslamabad44000Pakistan New Mexcico Institute of Mining&Technology SocorroNM 87801USA School of Chemical and Biomolecular Engineering The University of Sydney2006SydneyAustralia

Transition Metal Oxides have drawn significant attention due to their reversible chemical redox reaction and long-life *** agglomeration and shrinkage/expansion of transition metal oxides in the nanosize regime have a noticeable effect on their electrochemical *** in this work,mesoporous nanowires(NWs)with a typical composition of iron-nickel-cobalt ternary oxide(FNCO)are synthesized using a simple,facile and cost-effective hydrothermal process followed by furnace *** NWs are then extensively investigated as an electrode material for supercapacitor *** compare the electrochemical properties,nanowires of nickel-cobalt oxide(NCO),iron-cobalt oxide(FCO)and cobalt oxide(CO)were also produced by following the same *** FNCO NWs are found to overcome the shortcomings in the electrochemical energy storage devices by exhibiting higher values of specific capacitance(2197 Fg^(-1))and energy density(109 Whkg^(-1))at 1 Ag^(-1) current ***,the FNCO NWs also showed a cyclic charge/discharge stability of 96%even up to 20,000 ***,a FNCO//graphene asymmetric device,fabricated with FNCO NWs and graphene as positive and negative electrodes,respectively,which exhibit high energy density(47 Whkg^(-1)),power density(375 Wkg^(-1))and excellent capacitance retention(86%)after 15,000 cycles.

关键词： Electrochemistry Hydrothermal synthesis nanowires Supercapacitor Transition metal oxides

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Design of power management chip for piezoelectric energy harvesting

Design of power management chip for piezoelectric energy har...

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IEEE Conference on Electron devices and Solid-State Circuits

作者： Hua Yu Shibo Yang Wei Wang College of Optoelectronic Engineering Chongqing University Chongqing China Ministry of Education of China The Key Laboratory for Optoelectronic Technology & Systems Chongqing China National Key Laboratory of Fundamental Science of Micro/Nano-Device and System Technology Chongqing China

ISBN: (纸本)9781479923366

The paper proposes a complete energy harvesting solution integrated with a low-loss AC/DC rectifier and a high efficiency low dropout regulator (LDO) optimized for micro piezoelectric energy harvester. The AC/DC module converts AC into DC and then supplies power for the following LDO circuit module, through which the whole chip can obtain a stable 3.3V output voltage. A dynamic compensation mechanism is presented to improve the loop stability of LDO, which is easier to achieve high phase margin than traditional compensation strategy. The simulation results of LDO indicate that the typical dropout is 0.4mV with 1mA load current and 61mV with 150mA load current respectively, and the typical voltage line regulation error is 0.025%/V. In addition, the typical load regulation error was 0.00018%. The results demonstrate that the proposed chip meets the requirements of power supply for wireless sensor node (WSN).

关键词： Photonic band gap

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Design and simulation of corrugated diaphragm applied to the MEMS fiber optic pressure sensor

Design and simulation of corrugated diaphragm applied to the...

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IEEE International Conference on nano/micro Engineered and Molecular systems (NEMS)

作者： Yiming Gui Yangxi Zhang Guandong Liu Yilong Hao Chengchen Gao Institute of Microelectronics Peking University China National Key Laboratory of Science and Technology on Micro/Nano Fabrication China Innovation Center for Micro-Nano-electronics and Integrated System China Device and System Collaborative Innovation Center for Micro/Nano Fabrication Beijing China

ISBN: (纸本)9781509019489

In this paper, we propose a corrugated diaphragm applied to the fiber optic pressure sensor which needs a wide sensing range and a large deflection. The corrugated diaphragm can effectively improve the sensitivity of the sensor has been proved by ANSYS simulation. The stress concentration is weakened after the silicon is chamfered into corrugated diaphragm by isotropic etching process. The sensitivity of the corrugated diaphragm can reach to 0.44μ m/MPa which is two times larger than that of the same size planar diaphragm. The maximum sensing stress is up to 14MPa.

关键词： Stress Pressure sensors Sensitivity Optical fibers micromechanical devices Silicon

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Characteristic Analysis and the Experiment of Passive Matrix Addressing for Grating Light Modulator

Characteristic Analysis and the Experiment of Passive Matrix...

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中国微米纳米技术学会第十届学术年会暨第一届国际会议(1st International Conference of the Chinese Society of micro/nano technology)

作者： Jin Zhu Huang Shanglian Zhang Zhihai Wang Ning Zhang Jie Wei Wei The Key Laboratory of Fundamental Science of Micro/Nano Device & System Technology Chongqing400044China Optoelectronic Engineering Department Chongqing UniversityChongqing400044China

Grating Light Modulator (GLM) based on micro-Electro-Mechanical systems (MEMS) is applied in projection *** principle of GLM is introduced in the *** factors influencing the performance of passive matrix addressing for GLM are analyzed in *** the response frequency and the driving voltage are relative to the elastic coefficient of *** the elastic coefficient is larger,both response frequency and driving voltage are *** is indicated by analysis that in a m×n array when an all-selected pixel is actuated by a voltage V0,the voltages of half-selected pixel in row and column are respectively V0(m-1)/(m+n-1) and V0(n-1)/(m+n-1),and non-selected pixel's voltage is V0/(m+n-1).Finally,the operating voltage and the pull-in voltage are respectively 7.8V and 8.5V measured by the experiment,and these experimental values are very approximate to the theoretical *** GLM is actuated by a 7.8V square-wave voltage with lkHz frequency,the rising-edge time and the falling-edge time are respectively about 46.59μs and 44.77μ*** experiments indicate that the response frequency of GLM is about ***,the other experiment validates the correctness of crosstalk in a 16×16 GLM *** experiments provide a theoretical basis for improving the driver of GLM.

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Oxygen-promoted synthesis of armchair graphene nanoribbons on Cu(111)

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science China Chemistry 2021年第4期64卷 636-641页

作者： Penghui Ji Oliver MacLean Gianluca Galeotti Dominik Dettmann Giulia Berti Kewei Sun Haiming Zhang Federico Rosei Lifeng Chi Jiangsu Key Laboratory for Carbon-Based Functional Materials&Devices Institute of Functional Nano&Soft MaterialsSoochow UniversitySuzhou 215123China Centre Energie Matériaux et TélécommunicationsInstitut National de la Recherche Scientifique1650 Boulevard Lionel-BouletVarennesQCCanada Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China Deutsches Museum Museumsinsel 180538 MunichGermany Research Center for Advanced Measurement and Characterization National Institute for Materials ScienceTsukubaIbaraki 305-0047Japan

We report the systematic investigation of the effects of oxygen on the synthesis of 3 p sub-family armchair graphene nanoribbons(3 p-AGNRs),which revealed a strong catalytic effect with a reduction in the reaction temperature by approximately 180 K without degradation of the ***(para-phenylene)(3-AGNR)was generated through Ullmann-type coupling of4,4’’-dibromo-p-terphenyl on Cu(111),which was then converted into wider 3 p-AGNRs via lateral *** tunneling microscopy(STM)and X-ray photoelectron spectroscopy demonstrated the formation of different ribbons up to 12-AGNR,which contained regions exhibiting increased STM contrast that we attribute to the intercalation of Br atoms during lateral fusion.

关键词： on-surface synthesis graphene nanoribbons C–H activation scanning tunneling microscopy X-ray photoelectron spectroscopy

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A reflective display based on the electro-microfluidic assembly of particles within suppressed water-in-oil droplet array

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Light(science & Applications) 2023年第12期12卷 2742-2754页

作者： Shitao Shen Haoqiang Feng Yueming Deng Shuting Xie Zichuan Yi Mingliang Jin Guofu Zhou Paul Mulvaney Lingling Shui Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and DevicesSchool of Information and Optoelectronic Science and EngineeringSouth China Normal University510006 GuangzhouChina International Joint Laboratory of Optofluidic Technology and System(LOTS) National Center for International Research on Green OptoelectronicsSouth China Academy of Advanced OptoelectronicsSouth China Normal University510006 GuangzhouPeople’s Republic of China School of Electronic Information University of Electronic Science and Technology of ChinaZhongshan Institute528402 ZhongshanChina ARC Centre of Excellence in Exciton Science School of ChemistryUniversity of MelbourneParkvilleVIC 3010Australia

Reflective displays have stimulated considerable interest because of their friendly readability and low energy ***,we develop a reflective display technique via an electro-microfluidic assembly of particles(eMAP)strategy whereby colored particles assemble into annular and planar structures inside a dyed water droplet to create"open"and"closed"states of a display ***-in-oil droplets are compressed within microwells to form a pixel *** particles dispersed in droplets are driven by deformation-strengthened dielectrophoretic force to achieve fast and reversible motion and assemble into multiple *** eMAP based device can display designed information in three primary colors with≥170°viewing angle,~0.14 s switching time,and bistability with an optimized material *** proposed technique demonstrates the basis of a high-performance and energy-saving reflective display,and the display speed and color quality could be further improved by structure and material optimization;exhibiting a potential reflective display technology.

关键词： deformation reflective fluid

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