Structure and Morphology of SBA-15 Thin Films on Different Substrates

Well-ordered hexagonal mesoporous silica thin films, SBA-15 type, were synthesized with Pluronic P123 and tetraethyl orthosilicate in a diluted ethanol-hydrochloric acid solution. Films deposited on a broad range of distinct substrates by a sol-gel dip-coating method resulted in transparent and adhe...

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Bibliographic Details
Published inBrazilian journal of physics Vol. 44; no. 4; pp. 346 - 355
Main Authors Maranhão, Silvanna L. A., Cides da Silva, Luis C., Michels, Alexandre F., Horowitz, Flavio, Matos, Jivaldo R., Fantini, Márcia C. A.
Format Journal Article
LanguageEnglish
Published Boston Springer US 01.08.2014
Subjects
Condensed Matter
Physics
Physics and Astronomy
Dip coating
SBA-15
Sol-gel
Thin film
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Summary:Well-ordered hexagonal mesoporous silica thin films, SBA-15 type, were synthesized with Pluronic P123 and tetraethyl orthosilicate in a diluted ethanol-hydrochloric acid solution. Films deposited on a broad range of distinct substrates by a sol-gel dip-coating method resulted in transparent and adherent samples. Transmission electron microscopy images revealed, predominantly, well-ordered regions of hexagonal arrays of cylindrical mesopores parallel to the substrate. X-ray reflectivity showed similar lattice parameters for all analyzed films, with a ( h00 ) preferred orientation. The films presented diverse shrinkage susceptibilities, which were tested after different polymer removal procedures. Calcined films have 342 m 2 /g surface area, 0.130 cm 3 /g pore volume, and 6.8 nm pore diameter. The wetting characteristics of the substrates in water and alcoholic solutions were evaluated. The films showed different structural properties, mostly related to the mean surface roughness of the substrates and to the drying process.
ISSN:0103-9733
1678-4448
DOI:10.1007/s13538-014-0236-4