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Tailoring Alumina Thin Films Properties Using Hidrophile/Hidrophobe Polymer Additives

Luminita Isac 1,  Elena Purghel 1,  Anca Duta 1,  Gabrielle C. Chitanu 2,  Sorina Mitrea 3,  Mihaela I. Pelin 2

1. Transilvania University of Brasov, Centre Product Design for Sustainable Development, Eroilor 29, Brasov 500036, Romania
2. Petru Poni Institute of Macromolecular Chemistry of the Romanian Academy, Aleea Grigore Ghica Voda 41A, Iasi, Romania
3. ICPE-CA-Bucharest, 313 Splaiul Unirii, Bucharest 74204, Romania

Abstract

Micro- and nanostructured-cermets, with high absorptance in the visible region of the solar spectrum and low IR emittance, are widely used as heat absorbers in solar selective coatings. Thin films of alumina (Al2O3), with high refractive index (n = 1.54 – 1.76), good adhesion to different substrates, high thermal and chemical stability, are promising materials for ceramic matrix in cermets, IR coatings. The alumina based cermet properties strongly depend on Al2O3 layer properties, such as thickness and morphology. These properties can be tailored by varying the precursor solution composition (aluminium ions concentration, solvents and additives) and the deposition parameters (temperature, number of spraying sequences etc.).

In the present study, thin films of Al2O3 are deposited onto microglass and aluminium substrates by spray pyrolysis technique. As precursors, solutions with different AlCl3 concentrations in water:ethanol (1:1) mixture are used. As morphology controlling agents, acetylacetone and maleic acid based co-polymers are added in spraying solutions. The deposition temperature is varied from 150 to 350 °C, depending on the substrate type. The surface morphology (AFM) and composition (XRD) are correlated with optical properties (UV-VIS, FTIR), for optimizing the deposition parameters of Al2O3 thin film required for an alumina based cermet (Ni/Al2O3). In addition, a model of the alumina film formation (nucleation and growth) from precursors’ solution containing macromolecular compounds as additives is proposed.
 

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Presentation: Poster at E-MRS Fall Meeting 2007, Symposium B, by Luminita Isac
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-05-10 17:14
Revised:   2009-06-07 00:44