Thermal decomposition of the ammonium zinc acetate citrate precursor for aqueous chemical solution deposition of ZnO |
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Authors: | K Van Werde D Mondelaers G Vanhoyland D Nelis M K Van Bael J Mullens L C Van Poucke B Van Der Veken H O Desseyn |
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Affiliation: | (1) Limburgs Universitair Centrum, Laboratory of Inorganic and Physical Chemistry, IMO, B-3590 Diepenbeek, Belgium;(2) Department of Chemistry, RUCA University Antwerp, B-2020 Antwerpen, Belgium |
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Abstract: | The thermal decomposition of an aqueous chemical solution deposition Zn2+-precursor is studied by HT-DRIFT (high temperature diffuse reflectance infrared Fourier transform spectroscopy), on-line coupled TGA-EGA (thermogravimetric analysis - evolved gas analysis by Fourier transform infrared spectroscopy (FTIR) and mass spectrometry (MS)), and HT-XRD (high temperature X-ray diffraction). Using these complementary techniques, it is found that the -hydroxyl group of the citrate ligand plays a significant role in the decomposition pathway of the ammonium zinc acetate citrate precursor. TEM (transmission electron microscopy) shows that crystalline ZnO (zincite) is formed at 390°C, after dehydroxylation of the -hydroxyl group and subsequent decarboxylation of the Zn2+-precursor complex. Before total calcination, ZnO particles are already formed and a residual organic backbone thereby remains. The results obtained by these complementary techniques clearly indicate the importance of thermal analysis in the preparation of ceramics through chemical solution deposition. |
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