Silver‐plated polyamide fabrics with high electromagnetic shielding effectiveness performance prepared by in situ reduction of polydopamine and chemical silvering

Abstract

In this article, the silver-plated polyamide fabrics (SPPAFs) with high electroconductibility and shielding effectiveness were fabricated by using in situ reduction of polydopamine and chemical silvering. The effects of SPPAFs dopamine (C 8 H 11 O 2 N) and silver nitrate (AgNO 3 ) concentration on surface resistivity and electromagnetic interference shielding effectiveness were studied. The results showed that the surface resistivity of SPPAFs can reach a minimum value of 0.06 AE 0.014 Ω cm −1 , when C 8 H 11 O 2 N concentration is 4 g L −1 and the AgNO 3 concentration is 120 g L −1 . The shielding effectiveness of SPPAFs in the wide frequency range of 10-3000 MHz increases with the increase in the concentration of AgNO 3 , and increases first and stabilizes afterward with increasing C 8 H 11 O 2 N concentration. When the concentration of C 8 H 11 O 2 N and AgNO 3 is 3 and 120 g L −1 , respectively, mean shielding effectiveness values in the low-, medium-, and highfrequency bands are 71.3, 73.8, and 76.1 dB, respectively. Moreover, the mean shielding effectiveness values is 83.79 dB in the frequency range of 1.2-2.3 GHz. The dominant shielding mechanism of SPPAFs is the reflected electromagnetic waves and the absorption shielding effectiveness is less than 2 dB. The average electromagnetic shielding values of SPPAFs are above 67 dB after 16 weeks of storage, when C 8 H 11 O 2 N concentration is 4 g L −1 and the AgNO 3 concentration is 80 and 100 g L −1 . The prepared SPPAFs show promising applications in military textiles and smart wearable clothing.

Ag Nanoparticle-Coated Polystyrene Microspheres for Electromagnetic Interference Shielding Films with Low Metal Content

“…As shown in Figure f, the characteristic peaks at 2θ = 38.10, 44.32, 64.46, and 77.40° corresponded to the (111), (200), (220), and (311) faces of the face-centered cubic structure of silver, respectively . The strong signal peak for the binding energy around 370.0 eV in the XPS wide-scan data belonged to Ag 3d from metallic silver (Figure g). , The zero-valent metallic silver was further certified by the Ag 3d core-level spectrum of PS@Ag microspheres, as displayed in Figure h. It consisted of two peaks at binding energies of 368.0 and 374.0 eV corresponding to Ag 3d 5/2 and Ag 3d 3/2 , respectively .…”

“…28 The strong signal peak for the binding energy around 370.0 eV in the XPS wide-scan data belonged to Ag 3d from metallic silver (Figure 2g). 29,30 The zero-valent metallic silver was further certified by the Ag 3d core-level spectrum of PS@Ag microspheres, as displayed in Figure 2h. It consisted of two peaks at binding energies of 368.0 and 374.0 eV corresponding to Ag 3d 5/2 and Ag 3d 3/2 , respectively.…”

Electromagnetic shielding behavior of epoxy multi‐hybrid composites comprises of E‐glass fiber, Ag nanoparticle, and Ni nanosheet: A novel approach

“…where SE R(HMR) , SE A(HMR) , and SE M(HMR) are the attenuation of the incoming electromagnetic wave due to reflection, absorption, and multiple reflection of the hybrid multi-reinforcement shield, respectively. [17][18][19][20] The SE via EMI absorption could be estimated as:…”