Dielectric property determination of hybrid AlO-filled MWCNT buckypaper by the rectangular cavity perturbation technique.
- Resource Type
- Article
- Authors
- Miao, Hsin-Yuan; Liu, Jih-Hsin; Saravanan, L.; Tsao, Che-Wei; Pan, Jui-Wen
- Source
- Applied Physics A: Materials Science & Processing. Apr2015, Vol. 119 Issue 1, p211-217. 7p. 1 Diagram, 6 Graphs.
- Subject
- *MULTIWALLED carbon nanotubes
*QUANTUM perturbations
*PERMITTIVITY
*ALUMINUM oxide
*ELECTRICAL resistivity
- Language
- ISSN
- 0947-8396
This study investigated the complex dielectric permittivity of freestanding multiwalled carbon nanotube buckypaper (MWCNT-BP) and a synthesized hybrid alumina-filled buckypaper (AlO-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 AlO-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 AlO-BP sheet is discussed. [ABSTRACT FROM AUTHOR]