Nanostructure Development in Alkoxide-Carboxylate-Derived Precursor Films of Barium Titanate

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Stawski, T.M. and Veldhuis, S.A. and Besselink, R. and Castricum, H.L. and Portale, G. and Blank, D.H.A. and Elshof, J.E. ten (2012) Nanostructure Development in Alkoxide-Carboxylate-Derived Precursor Films of Barium Titanate. Journal of physical chemistry C, 116 (1). 425 - 434. ISSN 1932-7447

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Abstract:The structural evolution in wet alkoxide-carboxylate sol–gel precursor films of barium titanate upon drying was investigated by time-resolved small-angle X-ray scattering (SAXS). The morphology of as-dried amorphous precursor thin films was investigated by transmission electron microscopy (TEM) and electron energy loss spectroscopy (EELS). Sols were prepared from titanium(IV) iso-propoxide in 2-methoxyethanol and barium acetate in acetic acid. The structures that were visible with SAXS could be divided into oligomeric structures with fractal-like scattering characteristics, and randomly packed agglomerates of nanoparticles of similar size. The fractal-like morphologies disappeared during film drying, probably because they were not stable in the absence of a solvent matrix. Only the ordered agglomerate-like structures remained in the as-dried films. EELS on as-dried films showed that spatial separation between barium and titanium-rich domains occurred during the drying of the thin films on a length scale of nanometers, depending on hydrolysis ratio. This demonstrates that as-dried films are not necessarily uniform on the mesoscopic level.
Item Type:Article
Copyright:© 2012 ACS
Link to this item:http://purl.utwente.nl/publications/81870
Official URL:http://dx.doi.org/10.1021/jp209607w
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