Abstract
Temperature dependence of resistance is studied for polyimide (PI) samples implanted by Co+ ions with fluences of 2.5x10e16-1.25x10e17 cm-2 at ion current densities of 4, 8 and 12 microA.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 microA.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.
| Original language | English |
|---|---|
| Journal | Surface Science |
| Volume | 566-568 |
| Issue number | Part 1 |
| Pages (from-to) | 327-331 |
| Number of pages | 5 |
| ISSN | 0039-6028 |
| Publication status | Published - Sept 2004 |
| Externally published | Yes |
Keywords
- Ion implantation
- electrical transport
- metal/polymer composite