Structure and growth of ultrafine Cu-phthalocyanine particles produced in an inert gas of Ar or He have been discussed in comparison with the growth of fine metallic and metallic oxide particles. A new method to produce the particles a few tens of nm have been proposed. This method, called two-boat method, uses the convection flow of inert gas and temperatute distribution in the atmosphere. The particles were β-crystal of needle shape grown in b axis with a size less than a few tens of μm. The smoke ball of Cu-phthalocyanine have been produced in a He gas pressure less than 30 Torr. The coalescence growth of Cu-phthalocyanine particle has been discussed on the basis of size distribution and temperature distribution in the smoke.
