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[(a) and (b)] Over-view SEM images of porous polycrystalline from two constituent microcrystallites at outmost surface of the porous sample. [(c) and (d)] TEM images for sample A, displaying a few residual nanowires along with nanocrystals shown as small dots near the nanowires.
Infrared reflectance spectra of bulk polycrystalline (a) and as-prepared (curve I) and ultrasonically treated (curve II) porous polycrystalline (b).
Infrared transmission spectra of particles embedded in KBr for samples A (a) and B (b) measured right upon preparation of the aqueous solution in KBr, and after aging for 20 min and 24 h.
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