Dielectric response of multiwalled carbon nanotubes as a function of applied ac-electric fields
نویسندگان
چکیده
The complex dielectric constant is reported for multiwalled carbon nanotubes MWCNTs up to 105 Hz as a function of ac-electric field amplitudes Erot in phase and same frequency as the measurement and Eac different phase and fixed frequency with respect to the measurement . A slow relaxation process mode 1 is observed, which shifts to higher frequency with increasing Erot but is independent of Eac. A fast relaxation process mode 2 is also observed, which is independent of Erot but shifts to higher frequency with increasing Eac opposite to that of mode 1 . An ac-conductivity analysis of MWCNT reveals insights on how Erot and Eac influence the dissipation. © 2008 American Institute of Physics. DOI: 10.1063/1.3035963
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تاریخ انتشار 2008