Title :
Influence of porosity on stability of charge storage and piezoelectricity for porous PTFE film electrets
Author :
Xia, Z. ; Ma, S. ; Qiu, X. ; Wu, Y. ; Wang, F. ; Zhang, Y.
Author_Institution :
Pohl Inst. of Solid State Phys., Tongji Univ., Shanghai, China
Abstract :
In this paper, the influence of porosity on the piezoelectric d33 coefficient, charge storage stability and thermal stability of piezoelectricity in porous PTFE electrets is studied. The results point out that with the increase of porosity, the piezoelectric coefficient of the film goes up, and the thermal stability of space charge storage and piezoelectricity is improved. The reasons for the influence of porosity on the piezoelectric coefficient, the charge storage stability and the thermal stability of piezoelectricity are also investigated. Our results also demonstrate that the improvement of the thermal stability of the piezoelectric coefficient at increasing porosity is due to improved thermal charge stability and the improved stability of the mechanical properties of the material.
Keywords :
electrets; piezoelectric materials; polymer films; porous materials; space charge; thermal stability; charge storage stability; mechanical properties; piezoelectric coefficient; piezoelectricity; porosity; porous PTFE film electret; thermal stability; Electrets; Electrodes; Piezoelectric films; Piezoelectric materials; Piezoelectricity; Polymers; Space charge; Surface charging; Temperature; Thermal stability;
Conference_Titel :
Electrets, 2002. ISE 11. Proceedings. 11th International Symposium on
Print_ISBN :
0-7803-7560-2
DOI :
10.1109/ISE.2002.1043009
