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A novel three-dimensional spiral CoNi LDHs on Au@ErGO wire for high performance fiber supercapacitor electrodes Scopus
期刊论文 | 2019 , 236 , 728-731 | Materials Letters
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Abstract :

© 2018 Elsevier B.V. This work demonstrates a novel three-dimensional (3D) spiral fiber electrode, fabricated by electrochemically reducing of graphene oxide (GO) on Au wire followed with electrodeposition of CoNi layered double hydroxides (LDHs). The advanced electrode possesses combined features of micro size, good flexibility, high specific capacitance, excellent rate capability, and long cycling life, making it promises great potential as effective energy sources to integrate with other devices for wearable electronics.

Keyword :

CoNi LDHs Electrodeposition Fiber supercapacitor Microstructure Nanocomposites Wearable electronics

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GB/T 7714 Luo, Guoxi , Siong Teh, Kwok , Xia, Yong et al. A novel three-dimensional spiral CoNi LDHs on Au@ErGO wire for high performance fiber supercapacitor electrodes [J]. | Materials Letters , 2019 , 236 : 728-731 .
MLA Luo, Guoxi et al. "A novel three-dimensional spiral CoNi LDHs on Au@ErGO wire for high performance fiber supercapacitor electrodes" . | Materials Letters 236 (2019) : 728-731 .
APA Luo, Guoxi , Siong Teh, Kwok , Xia, Yong , Luo, Yunyun , Li, Zhikang , Wang, Shubei et al. A novel three-dimensional spiral CoNi LDHs on Au@ErGO wire for high performance fiber supercapacitor electrodes . | Materials Letters , 2019 , 236 , 728-731 .
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Evaluation of width and width uniformity of near-field electrospinning printed micro and sub-micrometer lines based on optical image processing EI SCIE Scopus
期刊论文 | 2018 , 28 (3) | JOURNAL OF MICROMECHANICS AND MICROENGINEERING
WoS CC Cited Count: 1
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Abstract :

This paper presents an experimental study using image processing to investigate width and width uniformity of sub-micrometer polyethylene oxide (PEO) lines fabricated by near-filed electrospinning (NFES) technique. An adaptive thresholding method was developed to determine the optimal gray values to accurately extract profiles of printed lines from original optical images. And it was proved with good feasibility. The mechanism of the proposed thresholding method was believed to take advantage of statistic property and get rid of halo induced errors. Triangular method and relative standard deviation (RSD) were introduced to calculate line width and width uniformity, respectively. Based on these image processing methods, the effects of process parameters including substrate speed (v), applied voltage (U), nozzle-to-collector distance (H), and syringe pump flow rate (Q) on width and width uniformity of printed lines were discussed. The research results are helpful to promote the NFES technique for fabricating high resolution micro and sub-micro lines and also helpful to optical image processing at sub-micro level.

Keyword :

optical image processing width and width uniformity near-field electrospinning (NFES) sub-micrometer process parameters

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GB/T 7714 Zhao, Libo , Xia, Yong , Hebibul, Rahman et al. Evaluation of width and width uniformity of near-field electrospinning printed micro and sub-micrometer lines based on optical image processing [J]. | JOURNAL OF MICROMECHANICS AND MICROENGINEERING , 2018 , 28 (3) .
MLA Zhao, Libo et al. "Evaluation of width and width uniformity of near-field electrospinning printed micro and sub-micrometer lines based on optical image processing" . | JOURNAL OF MICROMECHANICS AND MICROENGINEERING 28 . 3 (2018) .
APA Zhao, Libo , Xia, Yong , Hebibul, Rahman , Wang, Jiuhong , Zhou, Xiangyang , Hu, Yingjie et al. Evaluation of width and width uniformity of near-field electrospinning printed micro and sub-micrometer lines based on optical image processing . | JOURNAL OF MICROMECHANICS AND MICROENGINEERING , 2018 , 28 (3) .
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An Improved Fuzzy Neural Network Compound Control Scheme for Inertially Stabilized Platform for Aerial Remote Sensing Applications SCIE
期刊论文 | 2018 | INTERNATIONAL JOURNAL OF AEROSPACE ENGINEERING
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Abstract :

An improved fuzzy neural network (FNN)/proportion integration differentiation (PID) compound control scheme based on variable universe and back-propagation (BP) algorithms is proposed to improve the ability of disturbance rejection of a three-axis inertially stabilized platform (ISP) for aerial remote sensing applications. In the design of improved FNN/PID compound controller, the variable universe method is firstly used for the design of the fuzzy/PID compound controller; then, the BP algorithm is utilized to finely tune the controller parameters online. In this way, the desired performances with good ability of disturbance rejection and high stabilization accuracy are obtained for the aerial ISP. The simulations and experiments are, respectively, carried out to validate the improved FNN/PID compound control method. The results show that the improved FNN/PID compound control scheme has the excellent capability in disturbance rejection, by which the ISP's stabilization accuracy under dynamic disturbance is improved significantly.

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GB/T 7714 Zhou, Xiangyang , Li, Yating , Jia, Yuan et al. An Improved Fuzzy Neural Network Compound Control Scheme for Inertially Stabilized Platform for Aerial Remote Sensing Applications [J]. | INTERNATIONAL JOURNAL OF AEROSPACE ENGINEERING , 2018 .
MLA Zhou, Xiangyang et al. "An Improved Fuzzy Neural Network Compound Control Scheme for Inertially Stabilized Platform for Aerial Remote Sensing Applications" . | INTERNATIONAL JOURNAL OF AEROSPACE ENGINEERING (2018) .
APA Zhou, Xiangyang , Li, Yating , Jia, Yuan , Zhao, Libo . An Improved Fuzzy Neural Network Compound Control Scheme for Inertially Stabilized Platform for Aerial Remote Sensing Applications . | INTERNATIONAL JOURNAL OF AEROSPACE ENGINEERING , 2018 .
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A closed-form approach for the resonant frequency analysis of clamped rectangular microplates under distributed electrostatic force EI SCIE Scopus
期刊论文 | 2018 , 280 , 447-458 | SENSORS AND ACTUATORS A-PHYSICAL
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This paper proposes a fast-converged reduced-order model for small vibrations of electrostatically actuated rectangular microplates around their deformed states. On this foundation, one-mode analysis method and thus closed-form analytical expressions are developed for the fundamental resonant frequency analysis. Numerical multi-mode analysis is conducted to investigate the convergence. It is concluded that the one-mode analysis method can give a converged solution, which demonstrates that the proposed model has a faster convergence than previous models where multi modes are needed. The directly calculated resonant frequencies by the closed-form expressions are in good agreement with the numerical results by FEM simulations with less than 5% variation before pull-in. Parametric study shows the closed-form expressions are applicable to the cases in which the thickness is less than 1/20 of the length and width under a nominal length to width ratio of 1 similar to 2.5, and the gap distance is less than or equal to the thickness of the microplate. Additionally, a kind of electrostatic configurations based on multilayer microplates, capacitive micromachined ultrasonic transducers (CMUTs), were used to experimentally validate the closed-form expressions and good agreement was observed. (C) 2018 Elsevier B.V. All rights reserved.

Keyword :

Multilayer microplates Electrostatic microplates One-mode analysis Reduced-order model Resonant frequency Closed-form expressions

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GB/T 7714 Li, Zhikang , Zhao, Libo , Jiang, Zhuangde et al. A closed-form approach for the resonant frequency analysis of clamped rectangular microplates under distributed electrostatic force [J]. | SENSORS AND ACTUATORS A-PHYSICAL , 2018 , 280 : 447-458 .
MLA Li, Zhikang et al. "A closed-form approach for the resonant frequency analysis of clamped rectangular microplates under distributed electrostatic force" . | SENSORS AND ACTUATORS A-PHYSICAL 280 (2018) : 447-458 .
APA Li, Zhikang , Zhao, Libo , Jiang, Zhuangde , Zhao, Yihe , Li, Jie , Zhang, Jiawang et al. A closed-form approach for the resonant frequency analysis of clamped rectangular microplates under distributed electrostatic force . | SENSORS AND ACTUATORS A-PHYSICAL , 2018 , 280 , 447-458 .
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Construction of NiCo2O4@NiFe LDHs core/shell nanowires array on carbon cloth for flexible, high-performance pseudocapacitor electrodes EI SCIE Scopus
期刊论文 | 2018 , 767 , 1126-1132 | JOURNAL OF ALLOYS AND COMPOUNDS
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Abstract :

NiFe layered double hydroxides (LDHs), a class of ionic layered compounds with high electrochemical activity, possess great potential in the field of pseudocapacitive energy storage. However, the practical applications of NiFe LDHs in supercapacitors are largely hindered by their inherently poor cycling life and low electrical conductivity. In this work, NiFe LDHs electrodeposited on mesoporous and conductive NiCo2O4 nanowire arrays that are grown on flexible carbon cloth, are investigated as active materials for pseudocapacitive application. This rational core/shell electrode design promises high specific surface area, shorten electron and ion transport distance for the enhancement of electrochemical kinetics. As such, a high specific capacitance (1.9 F cm(-2) at 1 A cm(-2), and 1160 F g(-1) at 1 A g(-1)), excellent rate capability (83% retention as the current density was increased from 1 A cm(-2) to 20 A cm(-2)), decent cycling stability (79% retention after 1000 charging/discharging cycles), and good flexibility have been obtained, implying their potential application as energy storage devices for flexible electronics. (C) 2018 Elsevier B.V. All rights reserved.

Keyword :

Nanowires array Hydrothermal method NiFe LDHs Flexible pseudocapacitor Electrodeposition

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GB/T 7714 Luo, Guoxi , Teh, Kwok Siong , Xia, Yong et al. Construction of NiCo2O4@NiFe LDHs core/shell nanowires array on carbon cloth for flexible, high-performance pseudocapacitor electrodes [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2018 , 767 : 1126-1132 .
MLA Luo, Guoxi et al. "Construction of NiCo2O4@NiFe LDHs core/shell nanowires array on carbon cloth for flexible, high-performance pseudocapacitor electrodes" . | JOURNAL OF ALLOYS AND COMPOUNDS 767 (2018) : 1126-1132 .
APA Luo, Guoxi , Teh, Kwok Siong , Xia, Yong , Li, Zhikang , Luo, Yunyun , Zhao, Libo et al. Construction of NiCo2O4@NiFe LDHs core/shell nanowires array on carbon cloth for flexible, high-performance pseudocapacitor electrodes . | JOURNAL OF ALLOYS AND COMPOUNDS , 2018 , 767 , 1126-1132 .
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CAPACITIVE MICROMACHINED ULTRASONIC TRANSDUCERS FOR BIOCHEMICAL DETECTION WITH FLEXIBLE HIGH SENSITIVITY EI CPCI-S Scopus
会议论文 | 2018 , 924-927 | 31st IEEE International Conference on Micro Electro Mechanical Systems (MEMS)
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Abstract :

In this paper, we have designed and fabricated the capacitive micromachined ultrasonic transducers (CMUTs) by low temperature bonding process under 350 degrees C. And the electrospinning technology is innovatively applied as a coating method for the functionalization of CMUTs' top membrane to achieve a uniform fiber structure, which is beneficial to absorbing and releasing the biochemical gas, that is to say, it can be applied to recycling use. It was further demonstrated that the mass effect on functionalized CMUTs' resonant frequency has been distinctly intensified with the increase of direct current (DC) bias voltage V-bias between the top and bottom electrodes from 10V to 30V, the resonant frequency changes from 1.787 MHz to 1.664 MHz. Simultaneously volume sensitivity was calculated from 200.000 ppb/Hz to 78.125 ppb/Hz with the concentration of sulfur dioxide (SO2) from 100 ppm to 333 ppm. By applying appropriate V-bias, not only the volume sensitivity can be flexibly guaranteed, but also the energy consumption will be reduced.

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GB/T 7714 Zhao, Yihe , Lu, Dejiang , Zhao, Libo et al. CAPACITIVE MICROMACHINED ULTRASONIC TRANSDUCERS FOR BIOCHEMICAL DETECTION WITH FLEXIBLE HIGH SENSITIVITY [C] . 2018 : 924-927 .
MLA Zhao, Yihe et al. "CAPACITIVE MICROMACHINED ULTRASONIC TRANSDUCERS FOR BIOCHEMICAL DETECTION WITH FLEXIBLE HIGH SENSITIVITY" . (2018) : 924-927 .
APA Zhao, Yihe , Lu, Dejiang , Zhao, Libo , Xia, Yong , Li, Zhikang , Li, Jie et al. CAPACITIVE MICROMACHINED ULTRASONIC TRANSDUCERS FOR BIOCHEMICAL DETECTION WITH FLEXIBLE HIGH SENSITIVITY . (2018) : 924-927 .
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A piezoelectric cantilever with novel large mass for harvesting energy from low frequency vibrations Scopus
期刊论文 | 2018 , 8 (11) | AIP Advances
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© 2018 Author(s). The piezoelectric cantilever with a large proof mass is a classic vibration energy harvesting structure. In this study, in order to harvest much more energy from low frequency vibration in the finite volume, a novel L type mass block is proposed and compared with a traditional rectangular mass block for the piezoelectric cantilever. A theoretical modeling of lumped parameter system is carried out considering the effect of mass block length on mass, stiffness and damping. A series of PZT bimorph cantilevers with brass proof mass prototypes are fabricated for the experimental verification. Their eigenfrequency and maximum piezoelectric power output are analyzed by the experiment and simulation. The piezoelectric cantilever with L type mass block avoids the weakness of decreasing the effective length of piezoelectric cantilever, and has lower eigenfrequency and larger piezoelectric power output than that with rectangular mass block. Its piezoelectric power output of 192 mW/(g2) can be obtained at the low resonant frequency of 18.1 Hz and the optimal load impedance of 5kΩ, and the unit volume power density is as high as 24.6 mW/(cm3×g2).

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GB/T 7714 Wang, Lu , Lu, Dejiang , Jiang, Zhuangde et al. A piezoelectric cantilever with novel large mass for harvesting energy from low frequency vibrations [J]. | AIP Advances , 2018 , 8 (11) .
MLA Wang, Lu et al. "A piezoelectric cantilever with novel large mass for harvesting energy from low frequency vibrations" . | AIP Advances 8 . 11 (2018) .
APA Wang, Lu , Lu, Dejiang , Jiang, Zhuangde , Jia, Chen , Wu, Yumeng , Zhou, Xiangyang et al. A piezoelectric cantilever with novel large mass for harvesting energy from low frequency vibrations . | AIP Advances , 2018 , 8 (11) .
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Fabrication of capacitive micromachined ultrasonic transducers with low-temperature direct wafer-Bonding technology EI SCIE Scopus
期刊论文 | 2017 , 264 , 63-75 | SENSORS AND ACTUATORS A-PHYSICAL | IF: 2.311
WoS CC Cited Count: 3
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Abstract :

In this paper, the low temperature direct wafer-bonding technique under 350 C is used to fabricate the capacitive micromachined ultrasonic transducers (CMUTs) and the first illustration of CMUTs with a 15 x 15 array is obtained. In comparison with other wafer-bonding technology under high temperature beyond 400 degrees C, the thermal stress and thermal deformation of CMUTs produced in the wafer-bonding process can be decreased largely because of low bonding temperature. What's more, the low temperature direct wafer-bonding technique is beneficial to combine the CMUTs chip with integrated circuits (ICs) as well as reduce the parasitic capacitance. Based on the low temperature direct wafer-bonding process, a silicon-on-insulator (SOI) wafer with the silicon device layer used for transducer membrane and a low-resistivity silicon substrate with the structured SiO2 layer are bonded to fabricate the main structure of CMUTs. Therefore, the parasitic capacitance of CMUTs can be further reduced since there is no metal auxiliary layer existing during the bonding process. The structure morphology and electrical characterization of fabricated CMUTs are tested in this paper. Then, the impedance-frequency curve and the corresponding phase-frequency curve of the CMUTs are obtained perfectly, which demonstrate that the fabricated CMUTs based on the low-temperature direct wafer-bonding technique present the fine mechanical and electrical characteristics. (C) 2017 Elsevier B.V. All rights reserved.

Keyword :

Thermal deflection Parasitic capacitance Low temperature direct wafer-bonding CMUTs Thermal stress

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GB/T 7714 Zhao, Libo , Li, Jie , Li, Zhikang et al. Fabrication of capacitive micromachined ultrasonic transducers with low-temperature direct wafer-Bonding technology [J]. | SENSORS AND ACTUATORS A-PHYSICAL , 2017 , 264 : 63-75 .
MLA Zhao, Libo et al. "Fabrication of capacitive micromachined ultrasonic transducers with low-temperature direct wafer-Bonding technology" . | SENSORS AND ACTUATORS A-PHYSICAL 264 (2017) : 63-75 .
APA Zhao, Libo , Li, Jie , Li, Zhikang , Zhang, Jiawang , Zhao, Yihe , Wang, Jiuhong et al. Fabrication of capacitive micromachined ultrasonic transducers with low-temperature direct wafer-Bonding technology . | SENSORS AND ACTUATORS A-PHYSICAL , 2017 , 264 , 63-75 .
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Application and Optimization of Stiffness Abruption Structures for Pressure Sensors with High Sensitivity and Anti-Overload Ability EI SCIE PubMed Scopus
期刊论文 | 2017 , 17 (9) | SENSORS | IF: 2.475
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Abstract :

The influence of diaphragm bending stiffness distribution on the stress concentration characteristics of a pressure sensing chip had been analyzed and discussed systematically. According to the analysis, a novel peninsula-island-based diaphragm structure was presented and applied to two differenet diaphragm shapes as sensing chips for pressure sensors. By well-designed bending stiffness distribution of the diaphragm, the elastic potential energy induced by diaphragm deformation was concentrated above the gap position, which remarkably increased the sensitivity of the sensing chip. An optimization method and the distribution pattern of the peninsula-island based diaphragm structure were also discussed. Two kinds of sensing chips combined with the peninsula-island structures distributing along the side edge and diagonal directions of rectangular diaphragm were fabricated and analyzed. By bonding the sensing chips with anti-overload glass bases, these two sensing chips were demonstrated by testing to achieve not only high sensitivity, but also good anti-overload ability. The experimental results showed that the proposed structures had the potential to measure ultra-low absolute pressures with high sensitivity and good anti-overload ability in an atmospheric environment.

Keyword :

stress concentration region high anti-overload ability bending stiffness distribution high sensitivity peninsula-island structured diaphragm

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GB/T 7714 Xu, Tingzhong , Lu, Dejiang , Zhao, Libo et al. Application and Optimization of Stiffness Abruption Structures for Pressure Sensors with High Sensitivity and Anti-Overload Ability [J]. | SENSORS , 2017 , 17 (9) .
MLA Xu, Tingzhong et al. "Application and Optimization of Stiffness Abruption Structures for Pressure Sensors with High Sensitivity and Anti-Overload Ability" . | SENSORS 17 . 9 (2017) .
APA Xu, Tingzhong , Lu, Dejiang , Zhao, Libo , Jiang, Zhuangde , Wang, Hongyan , Guo, Xin et al. Application and Optimization of Stiffness Abruption Structures for Pressure Sensors with High Sensitivity and Anti-Overload Ability . | SENSORS , 2017 , 17 (9) .
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Density measurement sensitivity of micro-cantilevers influenced by shape dimensions and operation modes EI SCIE Scopus
期刊论文 | 2017 , 245 , 574-582 | SENSORS AND ACTUATORS B-CHEMICAL | IF: 5.667
WoS CC Cited Count: 2
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Abstract :

The coupled fluid-solid simulations have been developed to analyze the density measurement sensitivity (DMS) of resonant micro-cantilevers with different shapes, dimensions and operation modes. The analytical formulas have been established to illustrate the relationship of resonant frequency shifts and densities of working fluids. The coupled fluid-solid simulation analyses and experimental results have been used to study the effects of micro-cantilevers with different dimensions on the DMS under bending and torsion modes. The influences of micro-cantilevers with different shapes on the DMS have been also discussed and analyzed. It is concluded that the length and free end width of micro-cantilever as well as operation mode are the key factors affecting the DMS. In addition, the proposed coupled fluid-solid simulation method is an important instruction in the aspect of micro-cantilever design. At the last, the resonant frequency stability and resolution of sensor were analyzed to better understand the sensor's performance. (C) 2017 Elsevier B.V. All rights reserved.

Keyword :

Sensitivity Operation mode Micro-cantilever Coupled fluid-solid simulation Density

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GB/T 7714 Zhao, Libo , Hu, Yingjie , Hebibul, Rahman et al. Density measurement sensitivity of micro-cantilevers influenced by shape dimensions and operation modes [J]. | SENSORS AND ACTUATORS B-CHEMICAL , 2017 , 245 : 574-582 .
MLA Zhao, Libo et al. "Density measurement sensitivity of micro-cantilevers influenced by shape dimensions and operation modes" . | SENSORS AND ACTUATORS B-CHEMICAL 245 (2017) : 574-582 .
APA Zhao, Libo , Hu, Yingjie , Hebibul, Rahman , Xia, Yong , Huang, Linya , Zhao, Yulong et al. Density measurement sensitivity of micro-cantilevers influenced by shape dimensions and operation modes . | SENSORS AND ACTUATORS B-CHEMICAL , 2017 , 245 , 574-582 .
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