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International Journal of BiomaterialsVolume 2009 2009, Article ID 548406, 9 pages

Research Article

Physics Department, Kenyatta University, P.O. Box 43844-00100, Nairobi, Kenya

Institute of Experimental Physics I, University of Leipzig, 04103 Leipzig, Germany

Received 20 January 2009; Accepted 25 May 2009

Academic Editor: Aldo Boccaccini

Copyright © 2009 Wycliffe K. Kipnusu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Metal-sample-metal sandwich configuration has been used to investigate DC conductivity in 4 m thick Nandi flame Spathodea campanulata P. Beauv. seed cuticles. characteristics showed ohmic conduction at low fields and space charge limited current at high fields. Charge mobility in ohmic region was . Temperature-dependent conductivity measurements have been carried out in the temperature range 320 K 450 K. Activation energy within a temperature of 320 K–440 K was about 0.86 eV. Variable range hopping VRH is the main current transport mechanism at the range of 330–440 K. The VRH mechanism was analyzed based on Mott theory and the Mott parameters: density of localized states near the Fermi-level and hopping distance  cm, while the hopping energy was in the range of 0.72 eV–0.98 eV.

Autor: Wycliffe K. Kipnusu, Gabriel Katana, Charles M. Migwi, I. V. S. Rathore, and Joshua R. Sangoro



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