Preparation and spectroscopic characterization of blue CoAl2O4 coatings

Optically selective thin films of CoAl2O4 with a spinel structure were produced for an automotive lamps application by the sol-gel process using aluminum sec-butoxide, ethylacetoacetate chelating agent and cobalt nitrate hexahydrate. The use of two metal-oxide precursors is advantageous over the sin...

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Bibliographic Details
Published in:Journal of sol-gel science and technology 2003, Vol.26 (1-3), p.771-775
Main Authors: STANGAR, U. Lavrencic, OREL, B, KRAJNC, M
Format: Article
Language:English
Subjects:
Aluminum
Bimetals
Chelation
Chemistry
Cobalt aluminate
Colloidal gels. Colloidal sols
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Infrared analysis
Infrared spectra
Metal oxides
Optical properties
Precursors
Sol-gel processes
Spectrum analysis
Thin films
Weight reduction
X-ray diffraction
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Summary:Optically selective thin films of CoAl2O4 with a spinel structure were produced for an automotive lamps application by the sol-gel process using aluminum sec-butoxide, ethylacetoacetate chelating agent and cobalt nitrate hexahydrate. The use of two metal-oxide precursors is advantageous over the single bimetallic alkoxide precursor (aluminum cobalt isopropoxide), because it allows us to vary the Co/Al ratio in the precursor solution. We found that the Co/Al ratio should not exceed 0.3 if we are to achieve films with the characteristic blue colour at 700°C. The structural characteristics of the oxide powders were determined from infrared (IR) spectra and X-ray diffraction (XRD) analysis, while the optical properties of the films were investigated with UV-VIS spectroscopy.
ISSN:0928-0707
1573-4846
DOI:10.1023/A:1020770810027