Superflexible Interconnected Graphene Network Nanocomposites for High-Performance Electromagnetic Interference Shielding

Abstract

Graphene-enhanced polymer matrix nanocomposites are attracting ever increasing attention in the electromagnetic (EM) interference (EMI) shielding field because of their improved electrical property. Normally, the graphene is introduced into the matrix by chemical functionalization strategy. Unfortunately, the electrical conductivity of the nanocomposite is weak because the graphene nanosheets are not interconnected. As a result, the electromagnetic interference shielding effectiveness of the nanocomposite is not as excellent as expected. Interconnected graphene network shows very good electrical conduction property, thus demonstrates excellent electromagnetic interference shielding effectiveness. However, its brittleness greatly limits its real application. Here, we propose to directly infiltrate flexible poly(dimethylsiloxane) (PDMS) into interconnected reduced graphene network and form nanocomposite. The nanocomposite is superflexible, light weight, enhanced mechanical and improved electrical conductive. The nanocomposite is so superflexible that it could be tied as spring-like sucker. Only 1.07 wt % graphene significantly increases the tensile strengths by 64% as compared to neat PDMS. When the graphene weight percent is 3.07 wt %, the nanocomposite has the more excellent electrical conductivity up to 103 S/m, thus more outstanding EMI shielding effectiveness of around 54 dB in the X-band are achieved, which means that 99.999% EM has been shielded by this nanocomposite. Bluetooth communication testing with and without our nanocomposite confirms that our flexible nanocomposite has very excellent shielding effect. This flexible nanocomposite is very promising in the application of wearable devices, as electromagnetic interference shielding shelter.

Polypropylene Nanocomposite Filled with Spinel Ferrite NiFe2O4 Nanoparticles and In-Situ Thermally-Reduced Graphene Oxide for Electromagnetic Interference Shielding Application

“…The filling of RGO with NiFe 2 O 4 nanoparticles in the elastomer matrix introduces interfacial polarization, which is probably related to the synergistic behavior in permittivity and conductivity with an increase in the RGO filler content [77]. The existence of abundant surface functional groups and lattice defects on ferrite nanoparticles and reduced graphene oxide and also the multiple interfaces on ferrite-graphene polypropylene generates multiple reflections and also the scattering of incident electromagnetic waves, and consequently enhances the electromagnetic absorption ability [78,79,80]. The magnetic part of the electromagnetic waves interacts with the magnetic NiFe 2 O 4 nanoparticles and generates eddy current loss, magnetic tangent loss, and natural resonance.…”

Synthesis and Electromagnetic Interference Shielding Performance of Ti3SiC2-Based Ceramics Fabricated by Liquid Silicon Infiltration

“…During LSI, the liquid silicon infiltrated into TiC preform with capillary force and reacted with TiC particles. The density of all four samples increased to more than 3.7 g/cm 3 . It noted that the porosity of samples TA9 and TA12 increases slightly compared with that of samples TA3 and TA6.…”

“…For EMI shielding tests, the bars with dimensions of 22.86 × 10.16 × 3.00 mm 3 were cut from the as-fabricated samples, and then the scattering parameters (S-parameters: S 11 , S 12 , S 21 , S 22 ) in the frequency range from 8.2 to 12.4 GHz were measured with a vector network analyzer (VNA, MS4644A, Anritsu, Kanagawa, Japan) using the waveguide method, according to ASTM D5568-08. And then the reflected (R) and transmitted (T) coefficients were calculated by the following equations [22].…”

“…Electromagnetic interference (EMI) shielding materials have attracted more attention due to their extensive applications in protecting electronic devices from electromagnetic interference [1][2][3]. Metal-based and high-conducting polymer-based composites were the two most common types of EMI shielding materials.…”

Dopamine-Mediated Pre-Crosslinked Cellulose/Polyurethane Block Elastomer for the Preparation of Robust Biocomposites

“…6,7 The incorporated various nanofillers can serve as the reinforcing center to accelerate the composite transformation of an amorphous and/or semi-crystallized structure into a crystallized structure to obtain enhanced mechanical performance of biomaterials. 8,9 However, most nanofillers are nonbiodegradable, opposing the concept of green and sustainable biobased materials. As one of the most abundant biopolymers in nature, cellulose can be obtained from multiple sources such as plants, bacteria, or tunicates ranging in size from macroscale to nanoscale; cellulose has been employed as an environmental reinforcing filler in an array of polymers.…”