Zeolite membranes can be used in particular for gas separation. For this purpose the aim of this work was to focus on the seeding step of the synthesis of zeolite films and improve it in order to obtain thinner films. Indeed thinner films give rise to a lower pressure drop, an essential point in gas or liquid separation. For this purpose, several different seeding methods have been studied. The first method consisted in growing a film on a polished alumina disc. The results were quite good since we obtained a more uniform deposition compared to unpolished alumina support. But the polished sample was too much polished and the layer with fine porosity was not present anymore. In this work, we also studied seeding and the different steps of growing a film on silicon wafer. An interesting approach to obtain a dense deposition of seeds was to do multi-seeding, i.e. repeating the seeding process several times. It worked but the drawback is that the thickness of deposition increases with the seeds density. Moreover, the observation of several films after various synthesis times showed that nanoparticles are likely to take part in the growth mechanism. The last part of the report is about electrophoretic deposition. Despite all our efforts, it never worked as expected. But on the other hand the dip- coating method seems promising and might give very interesting results.