| Physicochemical aspects of novel surfactantless, self-templated mesoporous SnO2 thin films. | |
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MedLine Citation:
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PMID: 16800485 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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A novel method of synthesis consisting of the production of ordered arrangements of tubular pores distributed inside SnO2 annealed thin films, which are prepared from a rotating disk process carried out at 2000-3500 rpm, is herein described. The main novelty is that no surfactant molecules are required in order to create these ordered pore structures; the templating entities are supramolecular assemblies of oligomeric chains formed during the extra-long aging allowed to the sol-gel processing of tin(IV) tetra-tert-amiloxide, Sn(OAm(t))4, chelated with acetylacetone molecules. Low angle X-ray diffraction peaks of SnO2 thin films calcined at 500 degrees C clearly certify the existence of ordered mesostructures when employing the right H2O/Sn(OAm(t))4 molar ratio during the SnO2 sol-gel synthesis. The final SnO2 ordered mesostructures are reminiscent of those linked to MCM-41 and SBA-15 substrates. Pore-size distribution analyses proceeding from N2 sorption isotherms at 76 K on the SnO2 thin films calcined at 500 degrees C unequivocally confirm the presence of tubular mesopores (mode pore sizes ranging from 5 to 7 nm). The thicknesses of the SnO2 films range from 80 to 150 nm after performing a drying process at 100 degrees C and from 70 to 125 nm after calcining in air at 500 degrees C; these film thicknesses show, in general, decreasing trends when either the spinning rate or the H2O/(Sn(OAm(t))4 ratio is increased. |
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Authors:
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Celso Velasquez; Fernando Rojas; J Marcos Esparza; Armando Ortiz; Antonio Campero |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The journal of physical chemistry. B Volume: 110 ISSN: 1520-6106 ISO Abbreviation: J Phys Chem B Publication Date: 2006 Jun |
Date Detail:
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Created Date: 2006-06-27 Completed Date: 2007-07-23 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101157530 Medline TA: J Phys Chem B Country: United States |
Other Details:
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Languages: eng Pagination: 11832-7 Citation Subset: - |
Affiliation:
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Departamento de Química, Universidad Autónoma Metropolitana--Iztapalapa, P.O. Box 55-534, México, DF 09340, México. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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