Efficient electromagnetic interference shielding of flexible Ag microfiber sponge/polydimethylsiloxane composite constructed by blow spinning

Extreme environment-bearable polyimide film with a three-dimensional Ag microfiber conductive network for ultrahigh electromagnetic interference shielding

“…With the continuous development of electronic communication technology and portable/wearable electronic devices, efficient electromagnetic interference (EMI) shielding materials must be developed to ensure the normal operation of equipment and protect the human body from electromagnetic radiation [1][2][3][4][5][6]. Using metallic EMI shielding materials is limited in the electronic communication fields because of their high density and susceptibility to corrosion [7][8][9]. Polymer-based EMI shielding materials have attracted extensive attention due to their low density, corrosion resistance, and good flexibility [10][11][12][13][14][15].…”

“…The type of conductive filler is an important factor affecting the performance of polymer-based EMI shielding materials [16,17]. Compared with other types of conductive filler, Ag fiber is considered a promising EMI shielding material because of its excellent electrical conductivity and high aspect ratio [7,18]. However, Ag fiber invariably oxidizes in moist air or water and has poor processability and high cost [12].…”

“…Improving conductivity is generally considered to effectively improve EMI shielding performance [25][26][27][28][29][30]. Presently, constructing uniformly distributed Ag fiber architectures [28,31,32] and three-dimensional (3D) conductive skeletons [7,20,[33][34][35][36] are the two main strategies for improving the electrical conductivity of polymer/Ag fiber composites for efficient EMI shielding materials. Uniformly distributed Ag fiber architectures are usually fabricated by solution blending or melt blending [37].…”

“…Uniformly distributed Ag fiber architectures are usually fabricated by solution blending or melt blending [37]. The polymer solution or melt is uniformly mixed with Ag fibers and cast into a conductive composite material [7,38]. The Ag fibers in the composites prepared using these methods are randomly dispersed in the matrix and surrounded by electrically insulated polymer chains [37], resulting in discontinuity in the silver fiber network and high resistance of composites.…”

“…The Ag fibers in the composites prepared using these methods are randomly dispersed in the matrix and surrounded by electrically insulated polymer chains [37], resulting in discontinuity in the silver fiber network and high resistance of composites. Therefore, high Ag fiber content is usually required to form a connected conductive network that increases conductivity and achieves satisfactory EMI SE [7]. For example, the EMI SE of aramid nanofiber-Ti 3 C 2 T x MXene/AgNW nanocomposites prepared using the blending strategy reaches 50.9 dB at 80 wt% loading of MXene/AgNW (MXene:AgNW = 10:1) in the X-band region [39].…”