Abstract
In this work the structure-property relationships of SiCxNy(O):H gas separation membranes prepared by PECVD is investigated. X-ray photoemission spectroscopy, fast Fourier transform infra-red spectroscopy and X-ray reflectometry are used to determine both the atomic and chemical bond concentrations in the PECVD membrane materials. Coupling these experimental data with a continuous random network model (cluster approach), a 3D molecular description of the material is proposed. It is shown that such approach can depict the composition and the electronic density of the PECVD Sic(x)N(y)(O):H, thus providing description of material porosity that accounts for the measured gas transport properties of both He and N-2 through the membranes.