ESR study of the insulator-conductor transition in polyimide kapton induced by swift heavy ion irradiations

Autor:	J. Davenas, J.-P. Salvetat, A. Berthault, F. Brisard, J.-M. Costantini
Rok vydání:	1995
Předmět:	Nuclear and High Energy Physics Radiation Materials science Ion track Dangling bond Condensed Matter Physics Secondary electrons Ion Amorphous solid Kapton Swift heavy ion General Materials Science Atomic physics Polyimide
Zdroj:	Radiation Effects and Defects in Solids. 136:267-272
ISSN:	1029-4953 1042-0150
Popis:	Kapton-H thin films have been irradiated with heavy ions in the MeV/u range, in the electronic stopping power (Se) regime. Effective ion track radii are extrapolated from spin density measurements and are consistent with simulations of the radial distribution of the energy density deposited by secondary electrons. This yields an apparent quadratic dependence of the data versus Se. We postulate that the paramagnetic defects are dangling bonds on aromatic condensed structures, and that conductivity appears by overlap of these structures. The final product is a highly amorphous carbonaceous substance with a conductivity (10 4 Ω -1 .m -1 ) and a spin density (5 x 10 19 g -1 ) near that of ion implanted or pyrolysed Kapton.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::bcb606aff75eb4af5ecb5cf9c3e5adb1 https://doi.org/10.1080/10420159508218833 Zobrazit plný text záznamu