Acta Phys. -Chim. Sin. ›› 2000, Vol. 16 ›› Issue (07): 579-582.doi: 10.3866/PKU.WHXB20000701

• Communication •     Next Articles

Chiral Fractal Patterns of TCNQ Thin Films Grown by Vacuum Evaporation

Li Jian-Chang, Xue Zeng-Quan, Zhang Hao, Zeng Yan, Liu Wei-Min, Wu Quan-De   

  1. Department of Electronics,Peking University,Beijing 100871
  • Received:2000-03-07 Revised:2000-04-06 Published:2000-07-15
  • Contact: Xue Zeng-Quan


The unique two dimensional chiral “seahorse”-like fractal aggregates of pure tetra-cyanoquinodimethane (TCNQ) and PANI TCNQ complex thin films, deposited by vacuum evaporation, were observed and reported. The influence of some experimental factors, such as electrostatic field, substrates and deposition rate, on the fractal pattern formation was discussed in detail. It was found that the electrostatic effects, induced by charged particles, do not play a crucial role in the pattern growth process. We suggest that the key to the formation of the patterns lies in the special molecular structure and the unique process of the crystal growth of TCNQ thin films, and a new growth model was proposed.

Key words: Thin film, TCNQ, PANI, Fractal, Vacuum evaporation