A general nonaqueous route to crystalline alkaline earth aluminate nanostructures
authors Karmaoui, M; Willinger, MG; Mafra, L; Herntrich, T; Pinna, N
nationality International
journal NANOSCALE
keywords SOL-GEL ROUTES; METAL-OXIDE NANOPARTICLES; STRONTIUM ALUMINATE; OPTICAL-PROPERTIES; MESOCRYSTALS; NANOCRYSTALS; TEMPERATURE; MECHANISM; SRAL2O4
abstract A nonaqueous route based on the solvothermal reaction of alkaline earth precursors with aluminium isopropoxide in benzyl alcohol is introduced. This simple process leads to crystalline complex nanostructures of alkaline earth aluminates, which, up to now, could only be obtained by solid state reaction at temperatures above 1100 degrees C or by sol-gel and further calcination at temperatures only slightly lower (similar to 800 degrees C). The approach appears to be rather general since under the same reaction conditions BaAl(2)O(4), CaAl(4)O(7), and SrAl(4)O(7) could be obtained. The as-synthesized materials were characterized by X-ray diffraction, electron microscopy techniques, solid-state NMR and FT-IR spectroscopies. The reaction mechanism, which was Studied as well, indicates the in-situ formation of benzoate species. These call preferentially bind to particular crystallographic facets of the aluminates via bridging bonds, thereby stabilizing the surfaces that give rise to the peculiar complex structure of the final material. In order to supplement the synthesis approach and to investigate the formation of impurity phases, pure aluminium oxide hybrid nanostructures were synthesized under similar conditions and fully characterized.
publisher ROYAL SOC CHEMISTRY
issn 2040-3364
year published 2009
volume 1
issue 3
beginning page 360
ending page 365
digital object identifier (doi) 10.1039/b9nr00164f
web of science category Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied
subject category Chemistry; Science & Technology - Other Topics; Materials Science; Physics
unique article identifier WOS:000275164200008
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journal impact factor 7.233
5 year journal impact factor 7.713
category normalized journal impact factor percentile 86.592
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