Spontaneous electrical current in P(VDF/TrFE) copolymer

Author

Neto, João M GuimarÃes ; Faria, Roberto M.

Author_Institution

Dept. de Fisica, UFPI, Teresina, Brazil

fYear

1994

fDate

7-9 Sep 1994

Firstpage

685

Lastpage

689

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 1994. (ISE 8), 8th International Symposium on

Conference_Location

Paris

Print_ISBN

0-7803-1940-0

Type

conf

DOI

10.1109/ISE.1994.515211

Filename

515211