  Organic nanowires and quasi-two-dimensional chiral patterns of
tetracyanoquinodimethane have been successfully generated by vacuum thermal
evaporation. The nanowires and patterns were characterized by using atomic
force microscopy and transmission electron microscopy. The influence of
electric charged clusters, deposition rate, and substrate temperature were
experimentally investigated. Contrary to previous reports, charged clusters are
found to be unnecessary to the chiral pattern formation. It was shown that the
nanowire and pattern formation should be mainly dominated by its special
crystallization properties, though the effect of the growth conditions cannot
be neglected.
