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Charge carrier transport in polyimide with Co nanoparticles formed by ion implantation

Vladimir Popok (Institutionen för experimentell fysik, Atomfysik) ; M.G. Lukashevich ; S.M. Lukashevich ; R.I. Khaibullin ; V. Bazarov
Surface Science Vol. 566-568 (2004), p. 327-331.
[Artikel, refereegranskad vetenskaplig]

Temperature dependence of resistance is studied for polyimide (PI) samples implanted by Co+ ions with fluences of 2.5x1016-1.25x1017 cm-2 at ion current densities of 4, 8 and 12 uA.cm-2. It is found that electron transport in the implanted samples originates from radiation-induced changes of the PI and Co nanoparticle formation and it depends dramatically on the ion current density. A variable range hopping mechanism dominates for all fluences at a low ion current density of 4 uA.cm-2 while a transition to a semimetallic type of conductance is observed with an increase in ion current density due to agglomeration of the Co nanoparticles forming a percolation way for the charge carriers. It is shown that both quantum effects of weak localisation and electron-electron interaction give a significant contribution to the transport mechanism.

Nyckelord: Ion implantation, electrical transport, metal/polymer composite

Denna post skapades 2007-11-01. Senast ändrad 2007-11-06.
CPL Pubid: 60881


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Institutionen för experimentell fysik, Atomfysik (1997-2005)


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Chalmers infrastruktur