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PP film electrets obtained at different temperatures and irradiated by a low energy laser

T. YOVCHEVA1, T. EFTIMOV1,* , V. YANEV2, A. VIRANEVA1, G. MEKISHEV1, I. AVRAMOVA2

Affiliation

  1. Department of Experimental Physics, University of Plovdiv “Paissi Hilendarski”, 24 Tzar Assen Str., 4000 Plovdiv, Bulgaria
  2. Institude of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Block 11 Acad. G. Bonchev Str., 1113 Sofia, Bulgaria

Abstract

The paper studies the influence of low-energy laser radiation on the electret performance of polypropylene (PP) corona electrets. A 20 μm PP foil was charged in a positive and negative corona at 20 °C and 80 °C. The corona voltage was ±5kV, while that of the grid was ±1kV. The surface potential was measured using the method of the vibrating electrode with compensation. The electrets obtained were subjected to low-energy CO2 laser radiation with different exposure times, until a steady level was achieved. The drop in the relative surface potential versus irradiation energy was studied, and an exponential dependence was found..

Keywords

Polypropylene thin films, Electrets, Laser radiation.

Submitted at: Nov. 1, 2006
Accepted at: Feb. 15, 2007

Citation

T. YOVCHEVA, T. EFTIMOV, V. YANEV, A. VIRANEVA, G. MEKISHEV, I. AVRAMOVA, PP film electrets obtained at different temperatures and irradiated by a low energy laser, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 2, pp. 471-474 (2007)