Title: Dielectric property determination of hybrid Al2O3-filled MWCNT buckypaper by the rectangular cavity perturbation technique
Authors: Miao, Hsin-Yuan
Liu, Jih-Hsin
Saravanan, L.
Tsao, Che-Wei
Pan, Jui-Wen
College of Photonics
Issue Date: 1-Apr-2015
Abstract: This study investigated the complex dielectric permittivity of freestanding multiwalled carbon nanotube buckypaper (MWCNT-BP) and a synthesized hybrid alumina-filled buckypaper (Al2O3-BP) composite with different alumina loadings (5-30 wt%). The non-destructive microwave transmission technique for complex permittivity determination involving cavity perturbation was employed to characterize a set of Al2O3-BP sheets. This was done by filling a rectangular cavity resonator with a standard dielectric Teflon sample and then performing permittivity measurements for the buckypaper (BP) samples in the X-band frequency range (7-12 GHz). Field-emission scanning electron microscopy (FESEM) was used to analyze the morphology of the MWCNT-BP and the alumina-loaded BP composites. DC electrical resistivity measurements clearly demonstrated conductor-insulator transition. The effect of alumina loadings on the dielectric properties of the synthesized hybrid Al2O3-BP sheet is discussed.
URI: http://dx.doi.org/10.1007/s00339-014-8950-x
ISSN: 0947-8396
DOI: 10.1007/s00339-014-8950-x
Volume: 119
Begin Page: 211
End Page: 217
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