Study of electrical properties of a novel dosimeter based on polymer-carbon nanotube nano-composite

Authors

10.22052/2.3.17

Abstract

Use of carbon nanotubes (CNTs) in dosimetry is a promising technique for real time in vivo dose measurements with high resolution for nuclear medicine and also dose rate monitoring for radiation protection utilizations. In this research with respect to extraordinary electrical properties of CNTs for several order of magnitudes increasing in electrical conductivity of polymeric matrix, the idea of application of polymer-CNT composite is introduced. One of the effective factors in the response of this kind of dosimeter is electrical conductivity variation due to radiation absorption. In this research, we simulated electrical conductivity of polyethylene-CNT composite with COMSOL Multiphysics software in different weight percentages of CNTs and then percolation threshold for two kinds of geometries random and array was evaluated and compared with Bruggeman Symmetric Equation. The results of simulation showed that the application of COMSOL software for evaluating effective electrical conductivity of PE-CNT composite is suitable for dosimetry purpose

Keywords


[1] S. Iijima, \"Helical microtubules of graphitic carbon,\" Nature, vol. 354, pp. 56-58, 1991. [2] T. Durkop, et al., \"Extraordinary Mobility in Semiconducting Carbon Nanotubes,\" NANO LETTERS, vol. 4, pp. 35-39, 2004. [3] W. Bauhofer and J. Z. Kovacs, \"A review and analysis of electrical percolation in carbon nanotube polymer composites,\" Composites Science and Technology, vol. 69, pp. 1486-1498, 2009. [4] S. Maiti, et al., \"Low percolation threshold in melt-blended PC/MWCNT nanocomposites in the presence of styrene acrylonitrile (SAN) copolymer: Preparation and characterizations,\" Synthetic Metals, vol. 165, pp. 40-50, 2013. [5] O. Korostynska, et al., \"Radiation-induced changes in the electrical properties of carbon filled PVDF thick films,\" Materials Science and Engineering: B, vol. 141, pp. 115-120, 2007. [6] J. Ma and J. Yeow, \"Effect of percolation on electrical conductivity in a carbon nanotube-based film radiation sensor,\" IEEE, 2008. [7] F. Ziaie, et al., \"Storing Effects on Electrical Properties of High Energy Electron Beam Irradiated LDPE and HDPE,\" International Journal of Polymeric Materials, vol. 60, pp. 939–946, 2011. [8] F. Ziaie, et al., \"Effect of crystallinity on electrical properties of electron beam irradiated LDPE and HDPE,\" Radiation Physics and Chemistry, vol. 76, pp. 1684-1687, 2007. [9] W. S. Bao, et al., \"A novel approach to predict the electrical conductivity of multifunctional nanocomposites,\" Mechanics of Materials, vol. 46, pp. 129-138, 2012. [10] J. Wu and D. S. McLachlan, \"Percolation exponents and thresholds in two nearly ideal anisotropic continuum systems,\" Physica A, vol. 241, pp. 360-366, 1997. [11] Y. H. Li and J. T. Lue, \"Dielectric Constants of Single-Wall Carbon Nanotubes at Various Frequencies,\" Journal of Nanoscience and Nanotechnology, vol. 7, pp. 1-4, 2007. [12] G. Shani, Radiation Dosimetry: Instrumentation and Methods, second ed.: CRC Press, 2001.