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C and AC Electron-Transport Properties of Polyimide Foils Implanted by Co+ and Cu+ Ions | ||
| journal of al-qadisiyah for pure science(quarterly) | ||
| Article 1, Volume 11, Issue 2, 2011, Pages 1-8 PDF (0 K) | ||
| Author | ||
| Michail G. Lukashevich | ||
| Abstract | ||
| Temperature dependence of resistance in DC regime and AC electron-transport properties in thin polyimide (PI) foils implanted by 40 keV Co+ and Cu+ ions with fluencies range of 2.5 × 1016 to 1.25 ×1017 cm-2 at ion current densities of 4, 8 and 12 µA /cm2 were studied as function of ion fluence. It was found that in the contrary cobalt implantation, when implantation by highest fluence (1,25 × 1017 cm-2) at ion current density more 8 μA/cm2 lead to insulator – to – metal transition and change impedance characteristics from capacitive to inductive, implantation by copper ions did not lead to these changes. Catalysis action of cobalt atom on graphitization processes into carbonized polymer layer as well as forming elongate labyrinth-like conductive structure at Co+ implantation lead to insulator-to-metal transition and change impedance characteristics, whereas blocking π-electrons by copper atoms and forming spherical copper clusters in carbonized layer did not allow observe these transitions at the same regimes of implantation. | ||
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