Abstract. This work presents the results of investigation on 20 μm thick PTFE film electrets, prepared by the corona charging method performed in controlled gas medium. The following gases have been used: argon, carbon dioxide, air and oxygen. The temperature dependence of electret surface potential has been measured. The results obtained show the presence of a maximum in the temperature dependence of the surface potential. The magnitude of this maximum depends considerably on the gas used in the corona charging method. A corresponding interpretation of the results obtained has been given.

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