Abstract: Aseries of crystals of phenyl-capped tetraaniline in the leucoemeraldine oxidation state were obtained with three different preparation methods and were observed directly under transmission electron microscope(TEM). The crystals that crystallized at a higher temperature have a more perfect structure than those at a lower temperature. Both the lamella thickness and the crystal size increase as the isothermal temperatures increase. The oligomer is apt to form a larger scale crystal under a low degree of supercooling. Additionally, the crystal morphology has an important relationship with the kind of substrate on which the oligomer grows, and it will also change with the variation of solvents in which tetraaniline dissolves.

Key words: Tetraaniline, TEM, Crystal morphology, Crystal size