Open AccessInfluence of constant-current corona charging on electret state of porous PTFE film electret
Author(s) -
YanChao Wu,
Zhang Xia,
Zhenlian An,
Feipeng Wang,
Qiu Xun-Lin
Publication year - 2004
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.53.3146
Subject(s) - electret , materials science , dielectric , corona discharge , constant current , polytetrafluoroethylene , corona (planetary geology) , constant voltage , time constant , trapping , porosity , composite material , voltage , optoelectronics , electrical engineering , physics , astrobiology , venus , ecology , biology , engineering
The influence of constantcurrent and constantvoltage corona charging technique on the electret state of porous polytetrafluoroethylene(PTFE) film electret has been studied by constant current and constantvoltage corona charging at room temperature, is othermal surface potential decay, thermally stimulated discharge(TSD) and SEM(sc anning electron microscope), etc. Compared to the constantvoltage corona charging, the current through films is constant during constantcurrent charging, the r efore, the trapping possibility along the thickness direction of porous structur e increases and the charge density goes up, which improves the charge storage ab ilit y of the electret. However, the charges trapped in the dielectric surfaces of the interfaces with different depths along the thickness of the sample are externally stimulated during storage or application, their transport paths to the back electrode from the trapping positions are relatively shorter according to the hopping model of the charges, therefore the charge decay is accelerated and the charge sta bility is decreased.