Dielectric response of multiwalled carbon nanotubes as a function of applied ac-electric fields
- Department of Physics, Order-Disorder Phenomena Laboratory, Worcester Polytechnic Institute, Worcester, Massachusetts 01609 (United States)
The complex dielectric constant ({epsilon}{sup *}) is reported for multiwalled carbon nanotubes (MWCNTs) up to 10{sup 5} Hz as a function of ac-electric field amplitudes E{sub rot} (in phase and same frequency as the measurement) and E{sub ac} (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 E{sub rot} but is independent of E{sub ac}. A fast relaxation process (mode 2) is also observed, which is independent of E{sub rot} but shifts to higher frequency with increasing E{sub ac} (opposite to that of mode 1). An ac-conductivity analysis of MWCNT reveals insights on how E{sub rot} and E{sub ac} influence the dissipation.
- OSTI ID:
- 21180004
- Journal Information:
- Journal of Applied Physics, Vol. 104, Issue 11; Other Information: DOI: 10.1063/1.3035963; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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