We have been studying the solution interactions leading to formation of solid polymer-surfactant films at the air-solution interface. We want to use the mesostructures in the films as hosts for PAN/pyrene/micelle based sensors for metal ions in order to make solid-state metal ion sensors. In this experiment we wish to characterise the encapsulation of PAN and pyrene in the micelles in solution, in the presence and absence of the film forming polymers. This will enable us to determine changes in micelle shape and interactions with the polymer due to the pyrene and PAN species which will affect the structure and interactions in the films and the sensor behaviour. The results from these solution studies will be combined with reflectivity studies on the films to understand the relationship between structure, film formation and sensor function in this system.