Fabrication of polyamide 6/carbon nanotubes composite electrospun nanofibers for microwave absorption application

In this research, polyamide 6 (PA6)/sodium dodecyl sulfate (SDS)/multi walled carbon nanotubes (MWCNT) composite nanofibers with various MWCNT contents were fabricated by electrospinning process and their microwave absorption properties were evaluated in the frequency range of 8-12 GHz at room temperature. With increasing the concentration of MWCNT in the solution, the diameter of nanofibers decreased. The relationship between the average diameter of composite nanofiber d and MWCNT concentration C were obtained in the form: d = 277.5-12.5C. Very smooth surface of the composite electrospun nanofibers even for the nanofibers with MWCNT concentration of 10 wt % have been successfully prepared because of the high stability dispersion of MWCNT. It was observed that absorption microwave properties improved with increasing in the loading levels of MWCNT. Finally, the PA6/SDS/MWCNT composite nanofiber with the 10 wt % content of MWCNT has shown the reflection loss of -18 dB at the frequency of 11.5 GHz.