EMI shielding of cobalt, red onion husk biochar and carbon short fiber‐PVA composite on X and Ku band frequencies

Abstract

This present study discusses the effects of doped novel cobalt-onion peel-based water soluble Poly vinyl alcohol (PVA) composite for its electromagnetic interference shielding (EMI) effectiveness in high-frequency bands such as X and Ku region. The primary aim of this study was to prepare a flexible electromagnetic shielding material for protecting electronic gadgets from the EMI effect. The biochar particles were prepared from red onion peel and mixed with cobalt/chopped carbon fiber (CCF) to form a compound structure. According to the results, the biochar and CCF addition improved the relative permittivity up to 9.6. Similarly, the hysteresis analysis showed a broad "S" curve for 2 vol % cobalt-added PVA composite. Moreover the doped composites are better in mechanical properties and the highest tensile strength of 79 MPa with Shore-D hardness of 37 was noted for PV3 composite designation. Finally, the highest wave shielding of À44.37 dB and À 49.62 dB for X and Ku band were observed for composite designation PVA4. This EMI shielding effectiveness improved composites could be used as shielding material for modern industrial, defense, and medical applications.

A comparative study on nanoparticle network‐dependent electrical conductivity, electromagnetic wave shielding effectiveness and rheological properties in multiwall carbon nanotubes filled polymer nanocomposites

“…[56][57][58][59][60] Further, the materials with excellent electrical conductivity generally have outstanding EMW shielding effectiveness (SE). [61][62][63][64] Figure 4A, B depicts the variation of EMW SE (SE T ) with changing MWCNT loadings for the MWCNT/PCL nanocomposites and MWCNT/iPP nanocomposites at X-band. The PCLNT-0 and iPPNT-0 samples without MWCNTs exhibit particularly very low EMW SE T because of the low electrical conductivity, indicating that neat PCL and iPP have nearly no shielding for EMW.…”

Role of carbonaceous fillers in electromagnetic interference shielding behavior of polymeric composites: A review

“…The author summarized that the electrospinning technology's core‐shell, hierarchical, and orientation with thermal insulation, superhydrophobicity, self‐healing, smart response, and transparency are determined in developing novel functional electrospun nanofibrous materials for EMI shielding. Devi et al [ 111 ] studied the EMI shielding effect on X and Ku band with a PVA based composite toughened with biochar particles. Author reported a highest EMI shielding of −49.62 dB at Ku band frequency.…”

Mechanical, robust and conductive eco-friendly self-assembling hydrogel: a novel material for electromagnetic shielding

“…1–7 Radiofrequency and broadband electromagnetic waves have gradually gained popularity, especially with the development of portable devices such as Bluetooth, tablet computers and electronic monitoring devices. 8–15 However, while these devices bring us the convenience of life, they are accompanied by the issue of electromagnetic wave pollution. 11,16,17 The increasingly serious issue of extremely harmful electromagnetic radiation pollution, caused by the misuse of various electronic products and improper recycling behavior of equipment waste, poses irreparable harm and endangers the environment, humans, and other species.…”