Synthesis, characterization and color performance of novel Co²⁺-doped alumina/titania nanoceramic pigments

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• 作者：Hoda S. Hafez ; ^{hoda_hafez2@yahoo.com} ; E. El-fadaly
• 关键词：Sol&ndash ; gel ; Co2+-doped ; Alumina/titania ; Nanoceramic pigment ; Crystal structure ; Thermal stability
• 刊名：Spectrochimica Acta Part A ; Molecular and Biomolecular Spectroscopy
• 出版年：2012
• 期刊代码：99_13861425
• 类别：ch
• 出版时间：September, 2012
• 卷：95
• 期：Complete
• 页码：8-14
• 文件大小：1508 K

摘要

Blue-green nanoceramic pigments from Co²⁺-doped alumina-titania (xCo²⁺-Al₂O₃/TiO₂) have been synthesized by alkoxide sol-gel route from a mixture of titania and boehmite sols that derived from titanium isopropoxide and aluminum nitrate precursors. The composition of the alumina/titania (AT) matrix is 3:1 M ratio. A series of xCo²⁺:3TiO₂:1Al₂O₃ mixed oxides with different Co²⁺-dopant ion concentration has been prepared. The molar ratio of the Co²⁺-dopant ion in the Al₂O₃/TiO₂ matrix is from x = 0 to 0.5 M ratio relative to the titania composition. Characterizations of Co²⁺-doped alumina/titania nanocomposites are carried out using reflectance spectroscopy, transmission electron microscope (TEM), scanning electron microscopy (SEM-EDS), thermo-gravimetric analysis (TGA) and X-ray diffractometer (XRD). The experimental results demonstrated that the prepared Co²⁺-doped alumina-titania nanocomposites fulfill the current technological requirements for ceramic pigment applications that exhibit a high physico-chemical and thermal stabilities at high firing temperatures.