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|Title:||Thermally stimulated depolarization current behaviour of 50 MeV Li+ ion-irradiated kapton-H polyimide film|
Quamara, J K
|Abstract:||Different dielectric relaxation processes such as dipolar and space charge have been investigated in high-energy ion irradiated kapton-H polyimide using thermally stimulated discharge current (TSDC) technique. Kapton-H samples (12.5μm thickness) are irradiated with Li+ ion (50MeV) at different flux (5×105, 105, 104 ions/cm2) at Nuclear Science Center, New Delhi (PELLETRON Facility). The thermoelectret of irradiated samples are prepared following the usual method for various poling fields and temperatures. The TSD currents are obtained at heating rate of 2oC/min. The peak appearing at low temperature and associated with dipolar polarization is largely affected in irradiated samples. This is mainly due to the dimerization of the carbonyl groups. The high temperature peak which is associated with space charge relaxation becomes more pronounced in irradiated samples. High-energy ion-irradiation provides deep energy trap centers in the form of conjugated bonds due to de-localized electrons. Low temperature tail of TSDC shows many kinks. These kinks are due to creation or new cross- linking dependent sub polar groups and shallow energy traps as a result of high-energy ion - irradiation .|
|ISSN:||0975-1041 (Online); 0019-5596 (Print)|
|Appears in Collections:||IJPAP Vol.39(04) [April 2001]|
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