Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2009, Vol. 20 ›› Issue (5): 265-270 doi: 10.13538/j.1001-8042/nst.20.265-270

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Optical properties of carbon materials filled HDPE composites in THz region

CHEN Xiliang1,2 MA Mingwang1,2 YANG Xiaomin1,2 YANG Kang1,2 LIU Dan1,2 JI Te1 WU Shengwei1 ZHU Zhiyong1,*   

  1. 1Shanghai Institute of Applied Physics, Chinese Academy of Science, Shanghai 201800, China 2Graduate School of Chinese Academy of Science, Beijing 100049, China
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CHEN Xiliang, MA Mingwang, YANG Xiaomin, YANG Kang. Optical properties of carbon materials filled HDPE composites in THz region.Nuclear Science and Techniques, 2009, 20(5): 265-270     doi: 10.13538/j.1001-8042/nst.20.265-270

Abstract:

The optical and electrical properties of several composites, formed by filling the high density polyethylene (HDPE) with similar amount of carbon black (CB), multi-walled carbon nanotubes (MWNT) and fullerene (C60), respectively, were characterized using a THz-TDS setup. It was found that the optical parameters and the details of their variation with frequency differ significantly for different kinds of carbon materials. The results are analyzed by using Cole-Cole formula of dipole relaxation under the assumption that carbon particles dispersed in the matrix behave like dipoles and contribute mainly to the dielectric loss in the THz frequency range. Fitting results indicate that MWNT and CB filled composites have a broader distribution of the relaxation time compared with C60 which possesses a nearly single relaxation time. Compared with CB and C60, MWNT filled composite possesses the larger relaxation strength due to its higher electron density and larger conductive clusters. The real part of conductivity for three kinds of composites all follows power law behavior with respect to frequency but the exponents are quite different. These phenomena may be related to the special properties of the fillers as well as their particulate structures, such as aspect ratio, particle size, and aggregate structure, etc.

Key words: THz-TDS, Carbon materials, Dielectric properties