*2.4. SEM-EDS*

SEM and EDS analysis on selected spots of the cross sections were performed at the University Ca' Foscari of Venice (Department of Molecular Sciences and Nanosystems), using a TM3000 Hitachi tabletop scanning electron microscope coupled with a X-ray microanalysis system (SwiftED3000); conditions for recording the EDS spectra were: acquisition time 30.0 s; process time 5 s; accelerating voltage 15 kV.
