Alice Bejjani oral presentation (OB1-Thu2-1-1)
Depth Profiling of Micro-Patterned Honeycomb Polymer Films Using Large Argon Cluster Ion Beams
1 Lebanese Atomic Energy Commission-NCSR, Bir Hassan, 0011-8281 Beirut, Lebanon
2 Tissue Engineering Group, Instituto de Estudios Biofuncionales, Universidad Complutense de Madrid, Paseo Juan XXIII, 128040 Madrid, Spain
The multidimensional distribution of the chemical functional groups of micro-patterned honeycomb films have been investigated using large Argon cluster beams and employing Bi3+ as the analysis source of the Time of Flight Secondary Ion Mass Spectrometry technique. The porous films (pore size ~ 5 µm), prepared using the breath figure methodology, contain Polystyrene (PS used as reference) and variable amounts of block copolymers; either poly(2,3,4,5,6-pentafluostyrene)-b-polystyrene (P5FS-b-PS) or polystyrene-b-poly (poly-(ethylene glycol) methyl ether methacrylate) (PS-b-PPEGMA) . The experiments show that in case of PS/PS-b-PPEGMA blends (75/25, 50/50 and 90/10 wt. %) the PEGMA block emerges from the inside of the cavities’ walls (“coffee-stain” effect). In case of the PS/P5FS-b-PS blend (75/25 and 50/50 wt. %) the block copolymer’s ions have a ring-like patterns around the surface of the cavities suggesting that this copolymer has segregated to the edge of the pores. However, this fluorinated block is distributed homogenously in case of PS/P5FS-b-PS blends with 90/10 and 0/100 wt. %. The experimental images are in a good agreement with the ones obtained using the RAMAN spectroscopy. The effect of the Argon cluster beam energy and size, the delayed extraction and the angle of incidence of the sources onto the construction of the images are also discussed.