Abstract
The lightweight, carbon nanofibers (CNFs∼1, 2, 2.5, 3, and 4 wt.%) are dispersed into the epoxy matrix to synthesize nanocomposites for microwave absorption and EMI shielding application. The FESEM shows, non-uniform distribution of CNFs in the epoxy matrix. The 2.5 wt.% CNF/epoxy nanocomposite attains a maximum tensile strength of 43.22 MPa. On increasing CNFs concentration, the real part of permittivity increases due to high interfacial polarization, dipolar polarization and nano-capacitance effect, while imaginary part of permittivity increases mainly due to formation of highly conducting 3D network. The 2.5 wt.% CNF/epoxy exhibits maximum reflection loss of -24.46 dB with -10 dB absorption bandwidth of 2.11 GHz at a matching thickness of 1.6 mm. The maximum EMI shielding efficiency value of 12.6 dB is obtained for 4 wt.% CNF/epoxy nanocomposite. The correlation between reflection loss and EMI shielding mechanisms are explained by an interactive loss mechanism model.
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