Effects of Composition on the Electromagnetic Wave Shielding/Absorption and Corrosion in Zn-Ni Alloy Thin Film

In the Fourth industrial age, there is increasing use of electronic devices with high frequency (GHz) operating circuits for radio wave transmission/reception. This can lead to electromagnetic noise, and malfunctions in nearby devices. Electromagnetic shielding technology has emerged as an important way of preventing device malfunctions due to noise, and interest in shielding materials for electromagnetic waves has also increased. To allow compact integration and light weight electronic devices, highly efficient, thin and multifunctional film materials are required. This study selected the Zn-Ni alloy, which has adequate corrosion resistance, to protect the metal parent material of electronic components. Various compositions of the alloy were deposited using magnetron sputtering. Phase formation and composition were confirmed through XRD and SEM and EDS. The surface resistance of the thin films was measured using the 4point probe method, to calculate the shielding rate of the thin films. The electromagnetic wave shielding/absorption rate then measured according to frequency and the results compared with the calculated values. Corrosion resistance was evaluated with a polarization test. The far field electromagnetic shielding/absorption rate increased as the Zn content increased, up to 52 dB in a film with 70 at% of Zn. Corrosion resistivity behavior was the opposite. However, the Ni5Zn21 phase formation, which occurred in films with lower Zn composition, helped to improve electromagnetic absorption in the near field as well as corrosion resistivity. Therefore, the optimum composition of the Zn-Ni films was provisionally determined to be around Ni: Zn = 43:57 for electronic devices using electromagnetic waves in the near field range.

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Electromagnetic Wave Shielding Properties of ITO/PET Thin Film by Film Thickness

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.345-346.1585 ◽

2007 ◽

Vol 345-346 ◽

pp. 1585-1588 ◽

Cited By ~ 4

Author(s):

Do Hyoung Kim ◽

Han Ki Yoon ◽

Do Hoon Shin ◽

Riichi Murakami

Keyword(s):

Thin Films ◽

Electromagnetic Wave ◽

Film Thickness ◽

Indium Tin Oxide ◽

Electronic Devices ◽

Weight Ratio ◽

Shielding Effectiveness ◽

Glass Substrates ◽

Ito Thin Films ◽

Touch Panels

The thin films of indium tin oxide (ITO) are used for a variety of electronic devices such as solar cells, touch panels, liquid crystal displays (LCDs). However, these electronic devices are not strong enough against heavy impact since their ITO thin films are deposited on glass substrates. Therefore, ITO thin films were prepared by the inclination opposite target type DC magnetron sputtering equipment onto the Polyethylene Terephthalate (PET) substrate at room temperature using oxidized ITO with In2O3 and SnO2 in a weight ratio of 9:1. In this study, the transmittance, resistivity and electromagnetic wave shielding effectiveness of the ITO thin films prepared at various sputtering time (20~80min namely film thickness; 130~500nm) are measured. The results show that transmittance of the ITO thin films could show about 70% in the range of a visible ray by the variation of film thickness. It also can be seen that a minimum exists in the resistivity of ITO thin films for the variation of film thickness. Electromagnetic wave shielding effectiveness was increased as film thickness increased.

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A critical review: Electromagnetic shielding for pyrrole used textile materials

Journal of Industrial Textiles ◽

10.1177/1528083720938157 ◽

2020 ◽

pp. 152808372093815

Author(s):

Nurcan Biçer ◽

Irem Tuğçe Çelik ◽

Ishak Afşin Kariper

Keyword(s):

Literature Review ◽

Critical Review ◽

Electromagnetic Waves ◽

Daily Life ◽

Electronic Devices ◽

Electromagnetic Shielding ◽

Human Beings ◽

Discussion Section ◽

Textile Materials ◽

Yarn Structure

In this study, we examined the notable textile materials in the literature, which have been produced to prevent the electromagnetic waves emitted by the electronic devices that are a significant part of our lives. Nowadays, these devices and technologies that bring us many advantages in our daily life cause health problems on human beings, which leaded this type of studies to deepen. In this study, non-woven and woven products were examined. Produced tissue types found in the literature were excluded from the research. This literature review is mainly focused on the textile materials treated with pyrrole and having electromagnetic shielding property by producing via different methods either by doping metal in the fabric or yarn structure or by weaving with metal. Because it is known that the most successful studies on electromagnetic shielding were made by polypyrrole coating. In the last part of the study, suggestions have been submitted about the type of studies that should be done to provide electromagnetic shielding feature to the textile materials. We investigated 56 articles about electromagnetic shielding in the literature. 48 of 56 articles were evaluated. It seems that the researchers used to polypyrrole for electromagnetic shielding on textile surface, however they don’t investigate to advantage and disadvantage of polypyrrole for using. We discussed this issue and which material was more effective for electromagnetic shielding on the textile surface in the discussion section.

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Characterization of reactive phase formation in sputter-deposited Ni/Al multilayer thin films using TEM

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100167469 ◽

1996 ◽

Vol 54 ◽

pp. 1000-1001

Author(s):

G. Lucadamo ◽

K. Barmak ◽

C. Michaelsen

Keyword(s):

Thin Films ◽

Phase Formation ◽

Dark Field ◽

Nickel Layer ◽

Multilayer Thin Films ◽

Cross Sectional ◽

Dark Field Imaging ◽

Transmission Electron ◽

Sputter Deposited ◽

Constant Heating

The subject of reactive phase formation in multilayer thin films of varying periodicity has stimulated much research over the past few years. Recent studies have sought to understand the reactions that occur during the annealing of Ni/Al multilayers. Dark field imaging from transmission electron microscopy (TEM) studies in conjunction with in situ x-ray diffraction measurements, and calorimetry experiments (isothermal and constant heating rate), have yielded new insights into the sequence of phases that occur during annealing and the evolution of their microstructure.In this paper we report on reactive phase formation in sputter-deposited lNi:3Al multilayer thin films with a periodicity A (the combined thickness of an aluminum and nickel layer) from 2.5 to 320 nm. A cross-sectional TEM micrograph of an as-deposited film with a periodicity of 10 nm is shown in figure 1. This image shows diffraction contrast from the Ni grains and occasionally from the Al grains in their respective layers.

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Electromigration in thin films and electronic devices

10.1533/9780857093752 ◽

2011 ◽

Cited By ~ 4

Author(s):

Choong-Un Kim

Keyword(s):

Thin Films ◽

Electronic Devices

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Detection of delamination in composites by using electromagnetic penetrating radar

International Review of Applied Sciences and Engineering ◽

10.1556/irase.5.2014.2.7 ◽

2014 ◽

Vol 5 (2) ◽

pp. 151-156

Author(s):

Z. Mechbal ◽

A. Khamlichi

Keyword(s):

Electromagnetic Wave ◽

Electromagnetic Waves ◽

Electromagnetic Wave Propagation ◽

Wave Reflection ◽

Image Features ◽

Partial Reflection ◽

Straight Path ◽

Reflected Signal ◽

Short Time ◽

Intervening Factors

Composites made from E-glass/epoxy or aramid/epoxy are frequently used in aircraft and aerospace industries. These materials are prone to suffer from the presence of delamination, which can reduce severely the performance of aircrafts and even threaten their safety. Since electric conductivity of these composites is rather small, they can propagate electromagnetic waves. Detection of delamination damage can then be monitored by using an electromagnetic penetrating radar scanner, which consists of emitting waves having the form of short time pulses that are centered on a given work frequency. While propagating, these waves undergo partial reflection when running into an obstacle or a material discontinuity. Habitually, the radar is moved at constant speed along a straight path and the reflected signal is processed as a radargram that gives the reflected energy as function of the two-way time and the antenna position.In this work, modeling of electromagnetic wave propagation in composites made from E-glass/epoxy was performed analytically. The electromagnetic wave reflection from a delamination defect was analyzed as function of key intervening factors which include the defect extent and depth, as well as the work frequency. Various simulations were performed and the obtained results have enabled to correlate the reflection pattern image features to the actual delamination defect characteristics which can provide quantification of delamination.

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Near-Field nano-molding of gold thin films by a pulsed laser

International Congress on Applications of Lasers & Electro-Optics ◽

10.2351/1.5060599 ◽

2005 ◽

Author(s):

Dongbing Shao ◽

Shifeng Li ◽

Shaochen Chen

Keyword(s):

Thin Films ◽

Near Field ◽

Pulsed Laser ◽

Gold Thin Films

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New Approach to the Theory of Circular Dichroism

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19981187 ◽

1998 ◽

Vol 63 (8) ◽

pp. 1187-1201 ◽

Cited By ~ 1

Author(s):

Jaroslav Zamastil ◽

Lubomír Skála ◽

Petr Pančoška ◽

Oldřich Bílek

Keyword(s):

Electromagnetic Wave ◽

Circular Dichroism ◽

Electromagnetic Waves ◽

Maxwell Equations ◽

Optically Active ◽

Semiclassical Approach ◽

New Approach ◽

Isotropic Media ◽

New Formula ◽

Circular Dichroïsm

Using the semiclassical approach for the description of the propagation of the electromagnetic waves in optically active isotropic media we derive a new formula for the circular dichroism parameter. The theory is based on the idea of the time damped electromagnetic wave interacting with the molecules of the sample. In this theory, the Lambert-Beer law need not be taken as an empirical law, however, it follows naturally from the requirement that the electromagnetic wave obeys the Maxwell equations.

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Preparation and electromagnetic properties characterization of reduced graphene oxide/strontium hexaferrite nanocomposites

Nanotechnology Reviews ◽

10.1515/ntrev-2020-0010 ◽

2020 ◽

Vol 9 (1) ◽

pp. 105-114 ◽

Cited By ~ 1

Author(s):

Shumin Du ◽

Huaiyin Chen ◽

Ruoyu Hong

Keyword(s):

Electromagnetic Wave ◽

Environmental Pollution ◽

Electromagnetic Interference ◽

Electromagnetic Waves ◽

Rapid Development ◽

Living Environment ◽

World Health ◽

Electromagnetic Properties ◽

Strontium Hexaferrite ◽

Wave Radiation

AbstractWith the rapid development of electronics and information technology, electronics and electrical equipment have been widely used in our daily lives. The living environment is full of electromagnetic waves of various frequencies and energy. Electromagnetic wave radiation has evolved into a new type of environmental pollution that has been listed by the WHO (World Health Organization) as the fourth largest source of environmental pollution after water, atmosphere, and noise. Studies have shown that when electromagnetic wave radiation is too much, it can cause neurological disorders. And electromagnetic interference will cause the abnormal operation of medical equipment, precision instruments and other equipment, and therefore cause incalculable consequences. Therefore, electromagnetic protection has become a hot issue of concern to the social and scientific circles.

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