The use of ultrathin polymer films as sensoactive layers in chemical sensors has received great interest in recent years due to many advantages such as the wide choice of polymeric system (polymer types and/or combination, dopants in conducting polymers, etc), and the possibility of tailoring the properties of these films in terms of sensitivity and selectivity by an efficient control of the film formation process [1]. Among the techniques used for ultrathin films formation, self-assembly (SA) offers several advantages since the substrate can take any form and size, deposition time is independent of the substrate area, there are no requirements for additional equipments and/or clean rooms, and a large quantity of materials can be assembled into thin films [2-8].