  We report a technique which allows self-assembly of conducting nanoparticles
into long continuous chains. Transport properties of such chains have been
studied at low temperatures. At low bias voltages, the charges are pinned and
the chain resistance is exponentially high. Above a certain threshold
($V_{T}$), the system enters a conducting state. The threshold voltage is much
bigger than the Coulomb gap voltage for a single particle and decreases
linearly with increasing temperature. A sharp threshold was observed up to
about 77 K. Such chains may be used as switchable links in Coulomb charge
memories.
