Electrical Switching in Thin Films of Nandi Flame Seeds Cuticles

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Date
2009
Authors
Kipnusu, W. K.
Katana, G.
Migwi, C. M.
Rathore, I. V. S.
Sangoro, J. R.
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Publisher
Hindawi Publishing Corporation
Abstract
Current-voltage (I-V) characteristics of Nandi flame seed cuticles (NFSCs) have been studied as a function of irradiation, annealing, and poling temperature. The cuticles showed memory and threshold switching. Threshold voltage Vth was about 5 V which is almost five times higher than Vth observed in synthetic polymers. The threshold voltage Vth increased to 6–8 V after irradiation and annealing depending on the duration of annealing or irradiation. After switching, conductivity increased by an order of 102 . In reverse bias, increase of current was observed and the memory hysteresis loop was at higher conductivity than at the time of switching. Switching effect was minimized at a poling temperature of 370 K. Formation of semiquinones and quinoid radicals from phenolic compounds may have contributed to electrical switching and hysteresis effect.
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doi:10.1155/2009/830270
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