TY  - JOUR
A1  - Rychkov, Dmitry
A1  - Rychkov, A.
A1  - Efimov, N.
A1  - Malygin, A.
A1  - Gerhard, Reimund
T1  - Higher stabilities of positive and negative charge on tetrafluoroethylene-hexafluoropropylene copolymer (FEP) electrets treated with titanium-tetrachloride vapor
JF  - Applied physics : A, Materials science & processing
N2  - Tetrafluoroethylene-hexafluoropropylene copolymer (FEP) films were treated with titanium-tetrachloride vapor in a molecular-layer deposition process. As a result of the surface treatment, significant improvements of the thermal and temporal charge stability were observed. Charge-decay measurements revealed enhancements of the half-value temperatures and the relaxation times of positively charged FEP electrets by at least 120 A degrees C and two orders of magnitude, respectively. Beyond previous publications on fluoropolymer electrets with surface modification, we here report enhanced charge stabilities of the FEP films charged in negative as well as in positive corona discharges. Even though the improvement for negatively charged FEP films is moderate (half-value temperature about 20 A degrees C higher), our experiments show that the asymmetry in positive and negative charge stability that is typical for FEP electrets can be overcome by means of chemical surface treatments. The results are discussed in the context of the formation of modified surface layers with enhanced charge-trapping properties.
Y1  - 2013
U6  - https://doi.org/10.1007/s00339-013-7821-1
SN  - 0947-8396
VL  - 112
IS  - 2
SP  - 283
EP  - 287
PB  - Springer
CY  - New York
ER  -