Electroless silver plated flexible graphite felt prepared by dopamine functionalization and applied for electromagnetic interference shielding

摘要

Electromagnetic interference shielding (EMI SE) materials have drawn increasing attention due to the booming advance of electronic devices. Herein, a simple, high efficient, low-cost and environmental friendly approach was developed to fabricate highly conductive graphite felt combining with dopamine functionalization and eletroless plating for applications in EMI SE. The dopamine was firstly introduced to functionalize the graphite felt surface through self-polymerization and initiate the electroless silver plating. The modification of dopamine and formation of silver layer was investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). The optimized conditions were studied and the resulting silver layer covered on graphite felt exhibited a good electrical conductivity of 13.24 m Omega/sq and an excellent EMI SE effectiveness of 75 dB similar to 105 dB in the frequency range from 100kHZ to 3GHZ. The functional materials fabricated by this method also possess reliable durability and outstanding conductivity after washing, adhesion and bending tests, indicating this method is promising for fabricating flexible, lightweight and efficient EMI SE materials.