A Study on the Way to Increase Heat Resistance of Teflon Type Thin Film Electret Applied for Industrial Sensor

산업용 센서에 사용하는 Teflon계 박막 일렉트렛의 내열성 향상에 관한 연구

  • 김병수 ;
  • 이덕출
  • Published : 2003.09.01

Abstract

For the increase the charge stability of teflon electrets for used at uncomfortable industrial circumstances with high temperature or humidity, We made an investigation into double layer effect of teflon electrets. Teflon AF film was spincoated on FEP film and then the charge storage property of AF/FEP dual film was investigated to be compared with FEP film. It was found that the AF/FEP dual film has higher surface potential than FEP film on the repeated charging and annealing process. It seems that AF/FEP dual film has higher thermal stability than FEP film through TSC measurement. If the investigations of the double layer effect of Teflon film carried out more closely with it's molecular structures and surface conditions, it may be effectively improved the stability of charge storage.

Keywords

electrets;thermal stability;charge storage;double layer

References

  1. P. W. Chudleigh, 'Mechanism of Charge Transfer to a Polymer Surface by a Conducting Liquid Contact,' J. Appl. Phys. Vol. 47, pp. 4474-4483,1976
  2. W. D. Greason and B. H. Beyer, 'Coma Charging Method for Controlled Production of Film Electrets,' in 1982 Annual IAS-IEEE Meeting pp. 1148-1152
  3. J. H. Lowry, J. S. Mendlowitz. and N. S. Subramanian, 'Optical Characteristics of Teflon AF Fluoroplastic Materials,' Opt. Eng. Vol 31, pp. 1982-1985, 1992 https://doi.org/10.1117/12.59910
  4. W. Stark, 'Electret Formation by Electrical Discharge in Air,' J. of Electrostatics, Vol. 22, pp.329-339, 1989 https://doi.org/10.1016/0304-3886(89)90019-3
  5. 이덕출, 진경시, '고분자 코로나 일렉트렛의 이상 열자극전류에 관한 연구,' 전기학회논문지 제 3권, pp. 26-33, 1985
  6. G. M. Sessler and J. E. West, 'Production of High Quasi-permanent Charge Densities on Polymer Foils by Applications of Breakdown Fields,' J. Appl. Phys. Vol. 43, pp. 922-926, 1972 https://doi.org/10.1063/1.1661307
  7. P. W. Chudleigh, R. E. Collins, and G. D Hancock, 'Stability of Liquid charged Electrets,'Appl. Phys. Lett, Vol 23, pp. 211-212, 1973 https://doi.org/10.1063/1.1654861
  8. R. A. C. Altafim, J. A. Giacometti and J. M. Janiszewski, 'A Novel Method for Electret Production using Impulse Voltages,' IEEE Trans. Elec. InsuL., Vol. 27, pp. 739-743, 1992 https://doi.org/10.1109/14.155790
  9. B. Gross, R. Gerhard-Multhaupt, A. Berraissoul, and G. M. Sessler, 'Electron-beam Poling ofPiezoelectric Polymer Electrets,' J. Appl. Phys. Vol. 62, pp. 1429-1432
  10. G. M. Sessler, 'Electrets,' Laplacian Press, pp. 345-381, 1998
  11. T. Lu, 'Charge Storage in Teflon Films,' IEEE ISE9, pp. 66-71, 1996
  12. P. Gunther, H. Ding, and R. Gerhard-Multhaupt, 'Electret properties of spin-coated Teflon-AF films,' CEIDP Annual Report, pp. 197-202, 1993