• Title, Summary, Keyword: Electrical properties

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Effect of Film Thickness on Structural, Electrical, and Optical Properties of Sol-Gel Deposited Layer-by-layer ZnO Nanoparticles

  • Shariffudin, S.S.;Salina, M.;Herman, S.H.;Rusop, M.
    • Transactions on Electrical and Electronic Materials
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    • v.13 no.2
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    • pp.102-105
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    • 2012
  • The structural, electrical, and optical properties of layer-by-layer ZnO nanoparticles deposited using sol-gel spin coating technique were studied and now presented. Thicknesses of the thin films were varied by increasing the number of deposited layers. As part of our characterization process, XRD and FE-SEM were used to characterize the structural properties, current-voltage measurements for the electrical properties, and UV-Vis spectra and photoluminescence spectra for the optical properties of the ZnO thin films. ZnO thin films with thicknesses ranging from 14.2 nm to 62.7 nm were used in this work. Film with thickness of 42.7 nm gave the lowest resistivity among all, $1.39{\times}10^{-2}{\Omega}{\cdot}cm$. Photoluminescence spectra showed two peaks which were in the UV emission centered at 380 nm, and visible emission centered at 590 nm. Optical transmittance spectra of the samples indicated that all films were transparent (>88%) in the visible-NIR range. The optical band gap energy was estimated to be 3.21~3.26 eV, with band gap increased with the thin film thickness.

Iron Loss Analysis of Electric Machine Considering Vector Magnetic Properties of Electrical Steel Sheet (전기강판의 벡터 자기특성을 고려한 전기기기의 손실특성 해석)

  • Yoon, Heesung;Koh, Chang Seop
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.12
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    • pp.1813-1819
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    • 2012
  • This paper presents vector magnetic properties of an electrical steel sheet (ESS) employed for electric machine and iron loss analysis considering the vector magnetic properties of the ESS. The vector magnetic properties of the ESS are measured by using a two-dimensional single sheet tester and modeled by an E&S vector hysteresis model to be applied to finite element method. The finite element analysis considering the vector magnetic properties is applied to iron loss analysis of a three-phase induction motor model, and the influences of the vector magnetic properties on the iron loss distribution are verified by comparing with numerical results from a typical B-H curve model.

Study on Electrical Properties of Ceramic Coated Al Bus Bar (세라믹 코팅 Al 부스바의 전기적 특성 연구)

  • Baek, Seung-Myeong;Kwak, Min-Hwan;Kwag, Dong-Soon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.11
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    • pp.1647-1650
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    • 2017
  • Bus bars are used in place of cables because they can carry more electrical energy with the same volume of conductors. This paper deals with the electrical properties of ceramic coating material for busbars. A ceramic coated samples were prepared for the electrical properties test. There are two types of samples. One is a sample without degradation, and the other is a sample degraded for 30 days. Four electrical properties tests were carried out in accordance with domestic standards. Four electrical characteristics tests are AC dielectric breakdown, V-t, lighting impulse dielectric breakdown, and discharge arc. Both samples showed excellent electrical properties, and the ceramic coating material is very good insulating materials for bus bar.

Synthesis and Characterization of Graphene Based Unsaturated Polyester Resin Composites

  • Swain, Sarojini
    • Transactions on Electrical and Electronic Materials
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    • v.14 no.2
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    • pp.53-58
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    • 2013
  • Graphene-based polymer nanocomposites are very promising candidates for new high-performance materials that offer improved mechanical, barrier, thermal and electrical properties. Herein, an approach is presented to improve the mechanical, thermal and electrical properties of unsaturated polyester resin (UPR) by using graphene nano sheets (GNS). The extent of dispersion of GNS into the polymer matrix was also observed by using the scanning electron microscopy (SEM) which indicated homogeneous dispersion of GNS through the UPR matrix and strong interfacial adhesion between the GNS and UPR matrix were achieved in the UPR composite, which enhanced the mechanical properties. The tensile strength of the nanocomposites improved at a tune of 52% at a GNS concentration of 0.05%. Again the flexural strength also increased around 92% at a GNS concentration of 0.05%. Similarly the thermal properties and the electrical properties for the nanocomposites were also improved as evidenced from the differential scanning caloriemetry (DSC) and dielectric strength measurement.

Electrical Properties of ZnO:Al Transparent Conducting Thin Films for Film-Typed Dye Sensitized Solar Cell

  • Kwak, Dong-Joo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.22 no.11
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    • pp.36-43
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    • 2008
  • In this parer aluminium-doped zinc oxide(ZnO:Al) conducting layer was deposited on polyethylene terephthalate(PET) substrate by r. f. magnetron sputtering method. The effects of gas pressure and r. f. sputtering power on the structural and electrical properties of ZnO:Al thin film were investigated experimentally. Especially the effect of position of PET substrate on the electrical properties of the film was studied and fixed to improve the electrical properties and also to increase the deposition rate. The results show that the structural and electrical properties of ZnO:Al thin film were strongly influenced by the gas pressure and sputtering power. The minimum resistivity of $1.1{\times}10^{-3}[{\Omega}-cm]$ was obtained at 5[mTorr] of gas pressure, and 18D[W] of sputtering power. The deposition rate of ZnO:Al film at 5[mTorr] of gas pressure was 248[nm/min]. and is higher by around 3 times compared to that at 25[mTorr].

Electrical Conduction Properties of Linear Low Density Polyethylene/Ethylene Vinyl Acetate Blend Film (선형 저밀도 폴리에틸렌/에틸렌 비닐아세테이트 블렌드의 전기전도 특성)

  • Lee, Tae-Hoon;Lee, Chung-Ho;Cho, Kyung-Soon;Lee, Yong-Woo;Lee, Soo-Won;Shin, Jong-Yeol;Hong, Jin-Woong
    • Proceedings of the KIEE Conference
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    • pp.875-877
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    • 1998
  • In this paper, the physical and electrical properties of electrical insulating materials due to linear low density polyethylene (LLDPE)/ethylene vinyl acetate(EVA) blends are studied. The peak of LLDPE/EVA made by blend ratio of 70:30 at $2{\theta}=21.4^{\circ}$ in the results of XRD is higher than the others. In the experiment for electrical conduction properties in order to investigate the electrical properties of specimen, it is confirmed that electrical conduction is increased with the increase of molecular motions with the increase of temperature.

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A Study on Electrical and Thermal Properties of Polyimide/MWNT Nanocomposites

  • Park, Soo-Jin;Chae, Sung-Won;Rhee, John-Moon;Kang, Shin-Jae
    • Bulletin of the Korean Chemical Society
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    • v.31 no.8
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    • pp.2279-2282
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    • 2010
  • In this work, the electrical and thermal properties of polyimide/multi-walled carbon nanotube (MWNT) nanocomposites were investigated. The polyimide/MWNT nanocomposites contained from 0 to 2.0 wt % of MWNT. The electrical properties of the polyimide films were characterized by a specific resistance measurement. The thermal properties were evaluated using thermogravimetric analysis (TGA) and a differential scanning calorimeter (DSC). It was found that the thermal properties of the polyimide nanocomposites increased with increasing MWNT content and specific resistance as well. This result indicated that the crosslinking of polyimide/MWNT nanocomposites was enhanced by good distribution of the MWNT in the polyimide resins, resulting in the increase of the electrical and thermal properties of the nanocomposites.

A Study on Electrical Properties of Insulating Materials for Eco-friendly Distribution Power Cables (I) (친환경 배전급 전력케이블용 절연재료의 전기적 특성에 관한 연구 (I))

  • Lee, June-Ho;Kim, Chul-Ho;Cho, Young-Chul;Lee, Moon-Seok
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.3
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    • pp.551-556
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    • 2017
  • The cross-linked polyethylene(XLPE) has been most widely used for the power cable insulating layer because of its outstanding properties such as electrical and mechanical properties. However, XLPE is unrecyclable when disposed after replacement and demolishing because it becomes thermosetting through cross-linked process. Recently, because of growing social awareness of recycling and eco-friendly, there is growing need for the development of recyclable insulating materials that can replace XLPE. Therefore, the purpose of this study is to compare the electrical properties of XLPE and recyclable thermoplastic insulating materials. To this end, we compared and analyzed the electrical properties of XLPE and group N2 through AC breakdown test, accelerated water treeing test and accelerated life test(ALT).

Electron Transport Properties of Zn(phen)q Compared with Alq3 in OLED

  • Kim, Byoung-Sang;Kim, Dong-Eun;Choi, Gyu-Chae;Park, Jun-Woo;Lee, Burm-Jong;Kwon, Young-Soo
    • Journal of Electrical Engineering and Technology
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    • v.4 no.3
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    • pp.418-422
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    • 2009
  • We synthesized new electroluminescence materials [(1,10-phenanthroline)(8-hydroxyquinoline)] Zn(phen)q and investigated their electron transport properties. We used Zn(phen)q and $Alq_3$ for the conductive materials and measured their electron transport properties as a function of the organic layer thickness. The difference between Zn(phen)q and $Alq_3$ as electron transporting materials suggests that the electrical properties depends on the carrier injection.

Recent Advances in Carbon-Nanotube-Based Epoxy Composites

  • Jin, Fan-Long;Park, Soo-Jin
    • Carbon letters
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    • v.14 no.1
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    • pp.1-13
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    • 2013
  • Carbon nanotubes (CNTs) are increasingly attracting scientific and industrial interest because of their outstanding characteristics, such as a high Young's modulus and tensile strength, low density, and excellent electrical and thermal properties. The incorporation of CNTs into polymer matrices greatly improves the electrical, thermal, and mechanical properties of the materials. Surface modification of CNTs can improve their processibility and dispersion within the composites. This paper aims to review the surface modification of CNTs, processing technologies, and mechanical and electrical properties of CNT-based epoxy composites.