Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 5, Issue 5, Pages 1095-1105Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6tc04780g
Keywords
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Funding
- National Natural Science Foundation of China [51203034]
- International S&T Cooperation Program of China [2013DFR40700]
- Doctoral Program of Higher Education of China [20122302120038]
- Special Foundation of China Postdoctoral Science [2013T60379]
- China Postdoctoral Science Foundation [2013M541392]
- University of Tennessee
- China Scholarship Council
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Porous polymer nanocomposites with a density of only < 0.26 g cm(-3) and robust flexibility have been prepared by ionic self-assembly of gold nanoparticles (NPs) on the charged polymer skeleton made of poly(pyridobisimidazole)-grafted-poly(dimethyl diallyl ammonium chloride) (PIPD-g-PDDA) composite nanofibers. Toward electromagnetic interference(EMI) shielding, a shielding effectiveness of over -64.9 dB in the frequency range of 250 MHz-1.5 GHz was demonstrated in the as-obtained nanocomposites with a thickness of only 20 mu m. The equivalent gold thickness of these films was 10-50 times thinner than the skin depth of 6-12 mu m for the bulk gold in the same frequency range. The electrical conductivity of these composites was around 15890 S cm(-1) with the volume fraction of gold nanoparticles at 40.5%. The added nanoparticles enhanced the tensile strength by 12.4% as compared to the pure polymer films. No obvious degradation in electrical conductivity was observed even after repeatedly bending 1000 times with a bending radius of 1 cm. The shielding mechanism was disclosed by comparatively analyzing the reflection from the material surface (SER), the absorption of electromagnetic energy (SEA), and the multiple internal reflection of electromagnetic radiation(SEM).
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