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Electrical properties study of multi-walled carbon nanotubes/hybrid-glass nanocomposites

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Abstract

Electrical properties of multi-walled carbon nanotubes (MWNTs)/hybrid-glass nanocomposites prepared by the fast-sol–gel reaction were investigated in light of percolation theory. A good correlation was found between the experimental results and the theory. We obtained a percolation threshold ϕ c  = 0.22 wt%, and a critical exponent of t = 1.73. These values are reported for the first time for a silica-based system. The highest conductivity measured on the MWNT/hybrid-glass nanocomposites was σ ≈ 10−3(Ω cm)−1 for 2 wt% carbon nanotube (CNT) loading. The electrical conductivity was at least 12 orders of magnitude higher than that of pure silica. Electrostatic force microscopy and conductive-mode atomic force microscopy studies demonstrated conductivity at the micro-level, which was attributed to the CNT dispersed in the matrix. It appears that the dispersion in our MWNT/hybrid-glass system yields a particularly low percolation threshold compared with that of a MWNT/silica-glass system. Materials with electrical conductivities described in this work can be exploited for anti-static coating.

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Acknowledgments

The authors are indebted to Dr. Zeev Burshtein for critical reading of the manuscript, and to Mr. Arnold Bloom for his English style screening and improvement.

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Authors and Affiliations

  1. Photonic Materials Group, Applied Physics Division, Soreq NRC, Yavne, 81800, Israel

    Mariana Pokrass & Raz Gvishi

  2. The Racah Institute of Physics, The Hebrew University, Jerusalem, Israel

    Doron Azulay & Isaac Balberg

  3. Space Environment Department, Soreq NRC, Yavne, 81800, Israel

    Nurit Atar

  4. Department of Physical Electronics, School of Electrical Engineering, Tel-Aviv University, Ramat Aviv, Tel-Aviv, Israel

    Mariana Pokrass, Nurit Atar & Menachem Nathan

Authors
  1. Mariana Pokrass
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  2. Doron Azulay
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  3. Isaac Balberg
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  4. Nurit Atar
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  5. Raz Gvishi
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  6. Menachem Nathan
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Correspondence to Raz Gvishi.

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Pokrass, M., Azulay, D., Balberg, I. et al. Electrical properties study of multi-walled carbon nanotubes/hybrid-glass nanocomposites. J Sol-Gel Sci Technol 70, 517–527 (2014). https://doi.org/10.1007/s10971-014-3316-6

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  • DOI: https://doi.org/10.1007/s10971-014-3316-6

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