Electromagnetic interference shielding study in microwave and NIR regions by highly efficient Ag/ZnS and polyaniline-Ag/ZnS particles

Abstract

The chemical oxidative polymerization and co-precipitation methods were employed for the preparations of polyaniline (PANI) and silver-doped zinc sulfide (ZnS) nanoparticles to be used for electromagnetic interference (EMI) shielding. PVC-based composite films were fabricated by the incorporation of Ag/ZnS and PANI-Ag/ZnS nanoparticles. These nanoparticles were first analyzed by X-ray diffraction and zetasizer for their crystal structure and particle size. Prepared nanocomposite films were then analyzed for various properties like electrical conductivity, transmission in the near-infrared region (700 nm to 2500 nm), and EMI shielding efficiency in the microwave region (0.1 GHz to 20 GHz). These parameters were characterized by DC Conductivity, NIR spectroscopy, and vector network analyzer. It was found that with the addition of the concentration of nanoparticles, both values of conductivity and shielding efficiency improved. The highest attenuation value in 0.1 to 20 GHz reached 52.5 dB in 0.1 to 20 GHz frequency for 20 wt% PANI-Ag/ZnS and < 0.5% transmission was evaluated in the NIR region.

Novel electromagnetic interference shield developed by gamma irradiation of strengthened WPE/WEPDM thermoplastic elastomer With carbon nanotubes

“…Table 4 shows a comparison with the state of the recent published literature dealing with the electromagnetic interference with different shielding materials. [16][17][18][19][20][21][22][46][47][48][49][50][51][52][53][54][55] The electromagnetic shielding effectiveness (ESE) can be expressed as: ESE ¼ 10 log…”

“…15 There are various other conductive materials other than CNTs that are currently being used in EMI shielding. [16][17][18][19][20][21][22] Polymer processing by ionizing radiation is globally and dynamically safe as it does not require solvents or initiators at high temperature and permits one to avoid degradation phenomena and other side reactions typical of polymer processing in the melt. [23][24][25] Highenergy irradiation suggestions distinctive solutions to the problem of recycling due to its aptitude to induce crosslinking, scission and activation by creating free radicals of a varied range of material without introducing any chemical initiators and without dissolving the specimen, therefore, avoiding phase separation.…”

Role of adding carbon nanotubes in the electric and electromagnetic shielding behaviors of three different types of graphene in hybrid nanocomposites

“…11 According to the literature, besides carbon-based nanostructured materials, some other conductive fillers and strategies might be added to seek EMC. Some examples are conductive polymers (such as Polyaniline (PANI) 19 and Polypirrol (PPy) 20 ), metallic particles (such as copper and silver), 21,22 and also combinations of both types (such as Barium hexaferrite-polypyrrole (BHF-Ppy) 20,23 and PANI-Ag/ZnS nanoparticles 24 ). Although these materials achieve high attenuation values, the carbon-based nanocomposite materials present some advantages over those strategies, such as longer-term chemical stability than the conducting polymers, 21,22 and act mainly as EMI absorbents, not reflecting and causing secondary EMI pollution.…”

The Electromagnetic Interference Shielding Effectiveness and Dielectric Response of PVDF-nTiO2Nanocomposites Thin Films

“…To minimize these issues arising due to EMI, effective shielding materials need to protect the efficient operation of electronic systems. Electromagnetic interference (EMI) shielding is defined as the attenuation of the propagating electromagnetic waves produced by the shielding material [3]. The EMI-SE is based on 3 working principles viz, reflection, multiple reflections, and absorption [4].…”