Title :
Spontaneous electrical current in P(VDF/TrFE) copolymer
Author :
Neto, João M GuimarÃes ; Faria, Roberto M.
Author_Institution :
Dept. de Fisica, UFPI, Teresina, Brazil
Abstract :
Short-circuit electrical currents were observed in 60:40 mol% P(VDF/TrFE) copolymers above 80°C, temperature in which this polymer undergoes a structural ferro-to-paraelectric phase transition. The signal of this current was inverted when the sample is rotated so that the electrodes had their positions exchanged. Different combinations of metallic materials (aluminium, copper, nickel, and gold) were used as electrodes in metal(1)-polymer-metal(2) structures. Voltage signals were also detected in paraelectric samples, whose signal was equally dependent on the electrode combinations. This phenomenon is probably due to an electromotive force arising from different interfacial potential on both metal-sample interfaces
Keywords :
contact potential; electrets; ferroelectric materials; ferroelectric thin films; ferroelectric transitions; organic insulating materials; polymer blends; polymer films; short-circuit currents; 80 C; P(VDF/TrFE) copolymer; electromotive force; metal-sample interfaces; short-circuit electrical currents; spontaneous electrical current; structural ferro-to-paraelectric phase transition; Aluminum; Copper; Electrodes; Gold; Inorganic materials; Nickel; Polymers; Signal detection; Temperature; Voltage;
Conference_Titel :
Electrets, 1994. (ISE 8), 8th International Symposium on
Conference_Location :
Paris
Print_ISBN :
0-7803-1940-0
DOI :
10.1109/ISE.1994.515211
