scholarly journals Effect of the relative permittivity of oxides on the performance of triboelectric nanogenerators

RSC Advances ◽  
2017 ◽  
Vol 7 (78) ◽  
pp. 49368-49373 ◽  
Author(s):  
Yeon Joo Kim ◽  
Jaejun Lee ◽  
Sangwon Park ◽  
Chanho Park ◽  
Cheolmin Park ◽  
...  
Keyword(s):  
Relative Permittivity ◽  
Dielectric Materials ◽  
Oxide Materials ◽  
Positive Plate ◽  
Triboelectric Nanogenerators

The influence of the relative permittivity of dielectric materials on the performance of TENGs, by controlling the positive plate with various oxide materials, has been demonstrated.

scholarly journals Novel MNZ-type microwave sensor for testing magnetodielectric materials

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Abhishek Kumar Jha ◽  
Nicolò Delmonte ◽  
Adam Lamecki ◽  
Michal Mrozowski ◽  
Maurizio Bozzi
Keyword(s):  
Magnetic Properties ◽  
Relative Permittivity ◽  
Microstrip Line ◽  
Dielectric Materials ◽  
Metal Strip ◽  
Network Analyzer ◽  
Microwave Frequencies ◽  
Microwave Sensor ◽  
Iron Garnet ◽  
Good Agreement

Abstract A novel microwave sensor with the mu-near-zero (MNZ) property is proposed for testing magnetodielectric material at 4.5 GHz. The sensor has a double-layer design consisting of a microstrip line and a metal strip with vias on layers 1 and 2, respectively. The proposed sensor can detect a unit change in relative permittivity and relative permeability with a difference in the operating frequency of 45 MHz and 78 MHz, respectively. The MNZ sensor is fabricated and assembled on two layers of Taconic RF-35 substrate, with thicknesses of 0.51 mm and 1.52 mm, respectively, for the measurement of the sample under test using a vector network analyzer. The dielectric and magnetic properties of two standard dielectric materials (Taconic CER-10 and Rogers TMM13i) and of yttrium–gadolinium iron garnet are measured at microwave frequencies. The results are found to be in good agreement with the values available in the literature, which shows the applicability of the prototype for sensing of magnetodielectric materials.

scholarly journals A New Planar Microwave Sensor for Building Materials Complex Permittivity Characterization

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6328
Author(s):  
João G. D. Oliveira ◽  
José G. Duarte Junior ◽  
Erica N. M. G. Pinto ◽  
Valdemir P. Silva Neto ◽  
Adaildo G. D’Assunção
Keyword(s):  
Relative Permittivity ◽  
Building Materials ◽  
Dielectric Materials ◽  
Line Of Sight ◽  
Scattering Parameters ◽  
Microwave Sensor ◽  
Sensor Structure ◽  
Measurement Results ◽  
Concrete Blocks ◽  
The Difference

A new microwave sensor is proposed to characterize the complex relative permittivity of building non-magnetic materials and used in the characterization of three concrete samples. The proposed sensor structure consists of a log-periodic planar antenna with microstrip elements tilted forward by an angle β and printed, alternately, on the top and bottom sides of a dielectric layer. The operation principle is based on the measurement of the scattering parameters S11 and S21 in a free space propagation transmitter-receiver setup, for both cases with the material under test (MUT) sample (non-line-of-sight, NLOS) and without it (line-of-sight, LOS). A prototype is fabricated and measured to determine the scattering parameters of concrete samples. After measurements, the obtained results are used in the efficient and accurate Nicolson–Ross–Weir (NRW) method, making it possible to estimate the values of the complex relative permittivity of the concrete blocks. The sensor design is demonstrated from initial simulations to measurements for validation of the developed prototype. The obtained results for the complex relative permittivity of concrete are in agreement with those available in the literature and the difference between the simulated and measurement results for the sensor antenna resonant frequency is 4.71%. The used measurement setup can be applied to characterize different types of solid or liquid dielectric materials.

A New Technique to Determine the Complex Permittivity of Each Layer for a Bi-Layer Dielectric Material at Microwave Frequency

2017 ◽  
pp. 115-145
Author(s):  
Hassan Elmajid ◽  
Jaouad Terhzaz ◽  
Hassan Ammor
Keyword(s):  
Complex Permittivity ◽  
Relative Permittivity ◽  
Dielectric Material ◽  
Dielectric Materials ◽  
New Technique ◽  
S Parameters ◽  
A New Technique ◽  
Relative Errors ◽  
The Individual ◽  
Ku Band

A new technique is presented to determine the complex relative permittivity of each layer of a bi-layer dielectric material. The bi-layer material sample is loaded in a Ku-band rectangular waveguide and its two port S-parameters are measured as a function of frequency using a Network Analyzer. Also, by applying the mode matching technique, expressions for the S-parameters of the bi-layer dielectric material as a function of complex relative permittivity of each layer are developed. To estimate the complex permittivity of each layer for a bi-layer dielectric material, the square sums of errors between the measured and calculated S-parameters are minimized using a nonlinear optimization algorithm. The complex permittivity of each layer for a bi-layer dielectric material such as FR4-Teflon, FR4-Delrin and Delrin-Teflon are determined at the Ku-band frequencies, the average relative errors between the individual dielectric materials and those of each layer of bi-layer dielectric materials are calculated.

scholarly journals Water-Dielectric Single Electrode Mode Triboelectric Nanogenerators for Ocean Wave Impact Energy Harvesting

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 714 ◽  
Author(s):  
Ulises Tronco Jurado ◽  
Suan Hui Pu ◽  
Neil M. White
Keyword(s):  
Energy Harvesting ◽  
Alternative Energy ◽  
Dielectric Material ◽  
Load Resistance ◽  
Dielectric Materials ◽  
Wave Impact ◽  
Average Output ◽  
Output Performance ◽  
Triboelectric Nanogenerators ◽  
Triboelectric Effect

The effect of water wave impacts and breakdown on the output performance of Water-Dielectric Single Electrode Mode Triboelectric Nanogenerators (WDSE-TENG) has been evaluated. When water contacts a TENG consisting of a hydrophobic dielectric layer, the triboelectric effect is generated with a net negative charge on the dielectric material and net positive charge on the water surface. The hydrophobic dielectric materials, which show the highest electrical output performance in contact with water, were FEP, silicone rubber and polyimide. The average output power of each sample for a load resistance of 10 MΩ was found to be in the range 14.69 to 19.12 µW. The results demonstrate that WDSE-TENG devices can work as an alternative energy harvesting mechanism by using water as a triboelectric material.

scholarly journals CSRR-Based Microwave Sensor for Dielectric Materials Characterization Applied to Soil Water Content Determination

Sensors ◽  
2020 ◽  
Vol 20 (1) ◽  
pp. 255 ◽  
Author(s):  
João G. D. Oliveira ◽  
Erica N. M. G. Pinto ◽  
Valdemir P. Silva Neto ◽  
Adaildo G. D’Assunção
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Relative Permittivity ◽  
Water Concentration ◽  
Acrylonitrile Butadiene Styrene ◽  
Dielectric Materials ◽  
Split Ring Resonator ◽  
Red Clay ◽  
Complementary Split Ring Resonator

A new and compact sensor based on the complementary split-ring resonator (CSRR) structure is proposed to characterize the relative permittivity of various dielectric materials, enabling the determination of soil water content (SWC). The proposed sensor consists of a circular microstrip patch antenna supporting a 3D-printed small cylindrical container made out of Acrylonitrile-Butadiene-Styrene (ABS) filament. The principle of operation is based on the shifting of two of the antenna resonant frequencies caused by changing the relative permittivity of the material under test (MUT). Simulations are performed enabling the development of an empirical model of analysis. The sensitivity of the sensor is investigated and its effectiveness is analyzed by characterizing typical dielectric materials. The proposed sensor, which can be applied to characterize different types of dielectric materials, is used to determine the percentage of water contained in different soil types. Prototypes are fabricated and measured and the obtained results are compared with results from other research works, to validate the proposed sensor effectiveness. Moreover, the sensor was used to determine the percentage of water concentration in quartz sand and red clay samples.

scholarly journals Optimization of Ni0.95−xZnxCo0.05Fe1.90Mn0.02O4 ceramics with promising magneto-dielectric properties for VHF antenna miniaturization

2018 ◽  
Vol 08 (01) ◽  
pp. 1850001
Author(s):  
Zhuohao Xiao ◽  
Chuanhu Wang ◽  
Lie Liu ◽  
Zhihong Yang ◽  
Ling Bing Kong
Keyword(s):  
Dielectric Properties ◽  
Relative Permeability ◽  
Relative Permittivity ◽  
Dielectric Materials ◽  
Sintering Process ◽  
The Real ◽  
Antenna Miniaturization ◽  
Conductive Properties ◽  
Magnetic Dielectric

Magnetic, dielectric and DC conductive properties of Ni[Formula: see text]ZnxCo[Formula: see text]Fe[Formula: see text]Mn[Formula: see text]O4 (with [Formula: see text]-0.20 at an interval of 0.05) ferrite ceramics were studied, in order to develop magneto-dielectric materials with almost equal values of relative permeability and permittivity, for the miniaturization of HF (3–30[Formula: see text]MHz) and VHF (30–90[Formula: see text]MHz and 100–300[Formula: see text]MHz) antennas. The ferrite ceramics were prepared by using the conventional two-step sintering process. The real part of relative permeability is increased almost linearly with increasing concentration of Zn, while that of relative permittivity keeps nearly unchanged. It is found that promising magneto-dielectric materials, with close values of real permeability and permittivity over 30–90 MHz (VHF), can be obtained for the samples at Zn concentrations between [Formula: see text] and [Formula: see text].

Thin Films in Triboelectric Nanogenerators for Blue Energy Harvesting: Fabrication, Characterization, and Modeling

2020 ◽  
Vol 835 ◽  
pp. 335-346
Author(s):  
Yasser M. Shabana ◽  
Gehad Genidy Mohamed ◽  
Ahmed Ibrahim ◽  
Mohamed Abbas ◽  
Mohamed Mohie ◽  
...  
Keyword(s):  
Thin Films ◽  
Electrical Conductivity ◽  
Renewable Energy ◽  
Electrical Properties ◽  
Water Waves ◽  
Copper Film ◽  
Dielectric Materials ◽  
Geometrical Parameters ◽  
Aluminum Films ◽  
Triboelectric Nanogenerators

Renewable energy attracts many researchers as the non-renewable one has negative environmental impacts and limited availability. One of the main types of renewable energy is the blue energy where electricity is generated by water waves using triboelectric nanogenerators (TENGs). Thin films play an important role in the performance and therefore the efficiency of TENGs as they represent the electrodes between which electrons move producing electricity. In order to increase the generated electricity from TENGs, the properties of these electrodes should be modified. Therefore, in this paper, nano- and micro-size thin films are fabricated and characterized by measuring the geometrical parameters and electrical properties. Thin films are fabricated using aluminum with thicknesses 0.5 μm and 1.5 μm on acrylic substrate and 0.5 μm copper film on different types of dielectric materials including PVC and polystyrene. Atomic force microscopy is used to measure the geometrical parameters of the fabricated films including thickness and surface roughness. Also, Gwyddion software is used for the grain size evaluation. On the other hand, Keithley is used for measuring the electrical properties including electrical conductivity and sheet resistance. It is found that the electrical conductivity of aluminum films is inversely proportional to the thickness. The corresponding measured values of the electrical conductivity of the fabricated thinner and thicker aluminum films equal 1.7 x 107 (Ω.m)-1 and 1.4×107 (Ω.m)-1, respectively. Whereas, the electrical conductivity of the fabricated copper film equals 8.8×107 (Ω.m)-1. In addition, the temperature effects on the electrical conductivity are studied. Finally, simulation of a TENG using COMSOL software is accomplished in order to evaluate the electrical outputs of potential, charge, and energy.

Impact of High-K Dielectric Materials on Performance Analysis of Underlap In0.17Al0.83N/GaN DG-MOSHEMTs

NANO ◽  
2019 ◽  
Vol 14 (05) ◽  
pp. 1950060 ◽  
Author(s):  
Sarosij Adak ◽  
Sanjit Kumar Swain
Keyword(s):  
High Speed ◽  
Dielectric Materials ◽  
Mobility Model ◽  
Oxide Material ◽  
Oxide Materials ◽  
Short Channel ◽  
High K ◽  
Channel Effects ◽  
High K Dielectric ◽  
Gan Heterostructure

This work systematically investigated the effect of high-[Formula: see text] oxide materials on the performance of InAlN/GaN heterostructure underlap double gate (DG) MOS-HEMTs by considering 2D Sentaurus TCAD simulation. During the course of simulation, hydrodynamic mobility model was implemented and the obtained results were used for validating the model with the previously published experimental results. Different device performance parameters are thoroughly studied for different high-[Formula: see text] oxide materials by performing extensive simulations. It is verified that short channel effects (SCEs), key analog and RF figures of merits parameters and [Formula: see text]th improved with an increase in the value of high-[Formula: see text] oxide material. Moreover, it is also revealed that there is a significant growth in the values of key analog and RF figures of merits with respect to high-[Formula: see text] values. This analysis suggested that use of a suitable value of high-[Formula: see text]-valued oxide material in InAlN/GaN heterostructure underlap DG MOS-HEMTs can be one of the alternatives for future high speed and microwave applications.

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