Too little information. What chemical reaction. Whether a chemical reaction takes place prior to the crystallization that both phenomena are parallel. On what basis is created nanocomposite. etc.
still it is hard to understand (if at all) what you mean. Do you want to incorporate CNTs in Polyaniline? or do you want to grow PAni onto CNTs? which crystallisation are you talkng about? PAni? For an introduction into the field of Polyaniline, you may want to read this: