By Maxim Borowski
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Additional resources for Perovskites: Structure, Properties and Uses
This strategy is promising in the fabrication of 3DOM perovskites with mesoporous walls. Based on the evaporation-induced self-assembly (EISA) method reported by Yang et al. , a number of mesoporous single and mixed metal oxides have been produced. e. SrTiO3 with mesoporous structure was prepared using the EISA method with a specially formulated non-ionic block-copolymer KLE3739 (PBH79block-PEO89, PBH = hydrogenated poly(butadiene)) template . As shown in Figure 33, the walls are composed of nanoparticles (10−20 nm in size).
A) (b) 50 nm (d) (c) (f) (e) 50 nm 5 nm 20 nm 10 nm 5 nm Figure 33. HRTEM images of a SrTiO3 mesoporous ordered network (a−c) before crystallization, obtained at 590 oC, and (d−e) after crystallization, obtained at 630 oC. Controlled Fabrication and Catalytic Applications … 35 Although 3DOM metal oxides can be synthesized following the above mentioned methods, their surface areas are still relatively low (< 100 m2/g) and the pores are only macropores without mesopore formation on the walls.
36 Jiguang Deng, Lei Zhang, Yuxi Liu et al. Figure 34. TEM images of (a) as-prepared BaTiO3 crystallites and the SAED pattern (inset), nanoporous BaTiO3 calcined (b) at 300 oC and (c) at 400 oC. Compared to mesoporous single metal oxides, reports on the synthesis of mesoporous binary or mixed oxides via a nanocasting route are few [237−240]. To the best of our knowledge, there is no report claiming the successful preparation of mesoporous perovskites following such a nanocasting route. By carefully controlling the calcination temperature for perovskite structure formation and fully filling the mesopores of the hard template with a homogenous precursor solution, however, it is possible to make mesoporous perovskites through the nanocasting process.