Superflexible Interconnected GrapheneNetwork Nanocomposites for High-Performance Electromagnetic InterferenceShielding

摘要

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 tensilestrengths by 64% as compared to neat PDMS. When the graphene weightpercent is 3.07 wt %, the nanocomposite has the more excellent electricalconductivity up to 103 S/m, thus more outstanding EMI shielding effectivenessof around 54 dB in the X-band are achieved, which means that 99.999%EM has been shielded by this nanocomposite. Bluetooth communicationtesting with and without our nanocomposite confirms that our flexiblenanocomposite has very excellent shielding effect. This flexible nanocompositeis very promising in the application of wearable devices, as electromagneticinterference shielding shelter.