Easily fabricated and lightweight PPy/PDA/AgNW composites for excellent electromagnetic interference shielding

Abstract

Conductive polymer composites (CPCs) containing nanoscale conductive fillers have been widely studied for their potential use in various applications. In this paper, polypyrrole (PPy)/polydopamine (PDA)/silver nanowire (AgNW) composites with high electromagnetic interference (EMI) shielding performance, good adhesion ability and light weight are successfully fabricated via a simple in situ polymerization method followed by a mixture process. Benefiting from the intrinsic adhesion properties of PDA, the adhesion ability and mechanical properties of the PPy/PDA/AgNW composites are significantly improved. The incorporation of AgNWs endows the functionalized PPy with tunable electrical conductivity and enhanced EMI shielding effectiveness (SE). By adjusting the AgNW loading degree in the PPy/PDA/AgNW composites from 0 to 50 wt%, the electrical conductivity of the composites greatly increases from 0.01 to 1206.72 S cm, and the EMI SE of the composites changes from 6.5 to 48.4 dB accordingly (8.0-12.0 GHz, X-band). Moreover, due to the extremely low density of PPy, the PPy/PDA/AgNW (20 wt%) composites show a superior light weight of 0.28 g cm. In general, it can be concluded that the PPy/PDA/AgNW composites with tunable electrical conductivity, good adhesion properties and light weight can be used as excellent EMI shielding materials.

Scalable synthesis of robust and stretchable composite wound dressings by dispersing silver nanowires in continuous bacterial cellulose

“…The band at 1617 cm − 1 can be assigned to C--O [35]. An additional peak at 1558 cm − 1 in the BC/AgNW dressings' spectra results from the hydrogen bonding interaction between BC and AgNWs [35].…”

“…The bands at 1057 and 1112 are due to C-O stretching vibration and the peak at 1163 cm − 1 corresponds to the C-O-C stretching vibration [34]. The band at 1617 cm − 1 can be assigned to C--O [35]. An additional peak at 1558 cm − 1 in the BC/AgNW dressings' spectra results from the hydrogen bonding interaction between BC and AgNWs [35].…”

Magnetic-Electrospinning Synthesis of γ-Fe2O3 Nanoparticle–Embedded Flexible Nanofibrous Films for Electromagnetic Shielding

“…However, metals with poor flexibility and heavy weight have limited practical application in smart portable and wearable electronics. Therefore, preparing a practical, flexible, lightweight, and efficient EMI-shielding material is a huge challenge that has attracted the interest of many researchers at home and abroad [15][16][17][18][19][20][21]. In addition to the progress in this area, the development of a new family of flexible electromagnetic shielding materials based on nanofibrous films is also of great interest [13,14,[22][23][24][25][26][27][28][29].…”

Photoprintable nanowire–polymer blends synthesized by dynamic emulsion polycondensation

“…On the basis of the strong binding of PVP with N66 or similar polymers through H bonds, we expect PVP to function as a coupling agent between the AgNWs and N66 matrix. Although we discussed the coordination of PVP with AgNWs through the C═O moieties of the pyrrolidone rings (i.e., C═O─Ag), the C═O moieties of PVP also have the tendency to H‐bond with N─H side groups of the N66 chains (i.e., C═O•••H─N).…”