Abstract: In this work, we prepared oriented mesoporous thin films of silica on various solid substrates using the pluronic block copolymer P123 as a template. We attempted to insert guest iron oxide (FexOy) nanoparticles into these films by two different methods: (a) by co-precipitation—where iron precursors are introduced in the synthesis sol before deposition of the silica film—and subsequent oxide production during the film calcination step; (b) by preparing and calcining the silica films first then impregnating them with the iron precursor, obtaining the iron oxide nanoparticles by a second calcination step. We have examined the structural effects of the guest nanoparticles on the silica film structures using grazing incidence X-ray scattering (GISAXS), high-resolution transmission electron spectroscopy (HRTEM), spectroscopic ellipsometry, X-ray photoelectron spectroscopy (XPS), and Raman microscopy. Formation of nanoparticles by co-precipitation may induce substantial changes in the film structure leading, in our adopted process, to the appearance of lamellar ordering in the calcination stage. On the contrary, impregnation-based approaches perturb the film structures much more weakly, but are also less efficient in filling the pores with nanoparticles.
Keywords: oriented mesoporous silica films; grazing incidence X-ray scattering (GISAXS); iron oxide nanoparticles; impregnation; co-precipitation
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Andreou, I.; Amenitsch, H.; Likodimos, V.; Falaras, P.; Koutsoukos, P.G.; Leontidis, E. Organized Silica Films Generated by Evaporation-Induced Self-Assembly as Hosts for Iron Oxide Nanoparticles. Materials 2013, 6, 1467-1484.
Andreou I, Amenitsch H, Likodimos V, Falaras P, Koutsoukos PG, Leontidis E. Organized Silica Films Generated by Evaporation-Induced Self-Assembly as Hosts for Iron Oxide Nanoparticles. Materials. 2013; 6(4):1467-1484.
Andreou, Ioanna; Amenitsch, Heinz; Likodimos, Vlassis; Falaras, Polycarpos; Koutsoukos, Petros G.; Leontidis, Epameinondas. 2013. "Organized Silica Films Generated by Evaporation-Induced Self-Assembly as Hosts for Iron Oxide Nanoparticles." Materials 6, no. 4: 1467-1484.