TY  - JOUR
A1  - Rychkov, Dmitry
A1  - Kuznetsov, Alexey
A1  - Rychkov, Andrey
T1  - Electret properties of polyethylene and polytetrafluoroethylene films with chemically modified surface
JF  - IEEE transactions on dielectrics and electrical insulation
N2  - This paper investigates the effect of chemical surface modification of polytetrafluoroethylene (PTFE) and low density polyethylene (LDPE) films on their electret properties. PTFE films were subjected to wet treatment with three different chemicals: orthophosphoric acid, tetrabutyl titanate and tetraethoxysilane. The technique based on the principles of molecular layer deposition (MLD) method was used to modify the surface of LDPE films with phosphorus trichloride vapors. The surfaces of the films were then corona charged, and the electret charge stability was studied by means of isothermal and thermally stimulated surface potential decay. Both PTFE and LDPE films, after the surface treatment, displayed a considerable enhancement in the charge stability compared to the virgin samples. It is important to note that the enhancement of the charge stability was achieved in the positively charged PTFE films, a result important to practical applications. We attribute this effect of charge stabilization to the formation of new energetically deep traps on the modified surface. Decrease in molecular mobility, due to attachment of new chemical structures to the surface macromolecules, may also contribute to the overall growth of the charge stability.
KW  - Electrets
KW  - surface treatment
KW  - charge stability
KW  - charge carrier processes
KW  - polytetrafluoroethylene
KW  - polyethylene
Y1  - 2011
U6  - https://doi.org/10.1109/TDEI.2011.5704487
SN  - 1070-9878
VL  - 18
IS  - 1
SP  - 8
EP  - 14
PB  - Inst. of Electr. and Electronics Engineers
CY  - Piscataway
ER  - 
TY  - JOUR
A1  - Rychkov, Dmitry
A1  - Gerhard, Reimund
T1  - Stabilization of positive charge on polytetrafluoroethylene electret films treated with titanium-tetrachloride vapor
JF  - Applied physics letters
N2  - The surface of polytetrafluoroethylene films was treated with titanium-tetrachloride vapor. The treatment was carried out in a flow reactor by means of molecular-layer deposition, a method from the arsenal of chemical nanotechnology. X-ray photoelectron spectroscopy reveals that such a treatment results in considerable changes in the chemical composition at and near the surface of the fluoropolymer film. Both, defluorination and oxidation of the surface were observed. At the same time, samples treated with titanium tetrachloride show a significant enhancement in the thermal stability of the positive homocharge. The thermally stimulated surface-potential-decay curves were observed to shift to higher temperatures by more than 100 degrees C.
Y1  - 2011
U6  - https://doi.org/10.1063/1.3565166
SN  - 0003-6951
VL  - 98
IS  - 12
PB  - American Institute of Physics
CY  - Melville
ER  -