Electrical Switching in Thin Films of Nandi Flame Seed Cuticles

[摘要] 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 voltageVthwas about 5 V which is almost five times higher thanVthobserved in synthetic polymers. The threshold voltageVthincreased to 6–8 V after irradiation and annealing depending on the duration of annealing or irradiation. After switching, conductivity increased by an order of102. 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.

[学科分类] 材料工程