Nano silver conductive composite material for electromagnetic compatibility

Abstract

In this research work, copper wires with 0.0564 mm, 0.0502 mm, and 0.0447 mm diameters were selected as a conductive filler of core material for producing various resultant count of copper core yarn with cotton fibers and polyester fibers as sheath material. The copper core yarns with a resultant count of 118 Tex, 98 Tex, and 84 Tex were produced by G5/1 ring spinning machine with the core attachment device. From the produced copper core yarn different types of fabrics were produced by using a weaving machine. In order to improve the electromagnetic shielding effectiveness of copper core yarn woven fabrics, nano silver finishing was given. The copper core fabrics were treated by nano silver particles with various levels of nano silver concentration, ethanol, time, and copper wire diameter using Taguchi design experiments. The morphology structure, bonding nature, and size of silver nanoparticle treated copper core cotton and polyester fabrics were studied by scanning electron microscopy, energy-dispersive X-ray spectroscopy, Raman spectroscopy analyzer and X-ray diffraction. The effect of antibacterial properties of silver nano treated copper core cotton and polyester fabrics were also analyzed. X-ray diffraction and Raman spectroscopic studies have confirmed the crystalline structure of silver nanoparticle over surface of copper core cotton and polyester fabrics. Scanning electron microscopic and energy-dispersive X-ray spectroscopic studies revealed that the silver nanoparticles were formed and dispersed with spherical shape of about 30 to 50 nm. On increasing the nano silver concentration an increase in nano silver deposition and electromagnetic shielding has been observed in 500-12,000 MHz frequency range. The electromagnetic shielding effectiveness of nano silver finished fabrics were improved by 20-55% to that of the untreated copper core yarn fabrics.

Fabrication of a graphene coated nonwoven textile for industrial applications

“…Most research has focused on either coating or blending of polyester fibres or yarns with conductive materials [5][6][7][8][9][10][11][12][13][14]. The methods used to incorporate conductive materials with the fibres or yarns needs sophisticated processes and/or equipment which compromises large scale production.…”

Recent Progress in Magnetron Sputtering Technology Used on Fabrics

“…The square resistance of nano Ag films deposited by magnetron sputtering can reach 10 −2 Ω orders, shielding efficiency is as high as 60–80 dB. Therefore, Ag film coated fabric can endow excellent electromagnetic shielding and electrical conductivity properties to textiles [ 48 ]. Even if very thin Ag films of 2–20 nm are sputtered on the PET fabric surface, the coated fabrics can achieve favorable electromagnetic shielding effect and excellent electrical conductivity property [ 49 ].…”

Multifunctional Stretchable Conductive Woven Fabric Containing Metal Wire with Durable Structural Stability and Electromagnetic Shielding in the X-Band

“…Fabrics containing these components offer a great opportunity to develop a new wave of EM shielding textiles due to their versatility, flexibility and 3D conformability to any desired apparel. The use of yarns or fabrics with surface treatments, e.g., conductive paints [26,27], vacuum metallization, ionic/electroless plating, and cathode sputtering, whilst also flexible in terms of these desired properties and affording shielding of EM radiation, may not be strong enough to withstand the rigors that occur during wear.…”

“…Based on current literature on the EMI shielding of woven/knitted fabrics containing continuous metal wires and/or metallic fibers, it is noted that factors such as the type of metal, its thickness, metallic content and its distribution and orientation of within a yarn and/or fabric, along with fabric factors such as weave construction, warp/weft density, the lamination layers and lamination angles have considerable effects on the EMSE values of the resultant composite fabrics [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. However, work reported so far has mostly measured EM radiation in the low frequency range (usually 0-3 GHz) and fabrics without any elastic features.…”