作者:M. Crişan、Ana Brăileanu、M. Răileanu、D. Crişan、V. S. Teodorescu、R. Bîrjega、V. E. Marinescu、J. Madarász、G. Pokol
DOI:10.1007/s10973-006-8125-x
日期:2007.4
Pure TiO2 and S-doped TiO2 sol–gel nanopowders were prepared by controlled hydrolysis-condensation of titanium alkoxides. The influence of different Ti-alkoxides (tetraethyl-, tetraisopropyl- and tetrabutyl-orthotitanate) used in obtaining TiO2 porous materials in similar conditions (water/alkoxide ratio, solvent/alkoxide ratio, pH and temperature of reaction) has been investigated. The relationship between the synthesis conditions and the properties of titania nanosized powders, such as thermal stability, phase composition, crystallinity, morphology and size of particles, BET surface area and the influence of dopant was investigated. The nature of the alkyl group strongly influences the main characteristics of the obtained oxide powders, fact which is pointed out by thermal analysis, X-ray diffraction, TEM and BET surface area measurements.
纯二氧化钛和掺杂二氧化钛的溶胶-凝胶纳米粉末是通过控制钛烷氧基的水解缩合反应制备的。在类似条件下(水/烷氧基的比例、溶剂/烷氧基的比例、反应的pH值和温度),研究了用于获得二氧化钛多孔材料的不同钛烷氧基(四乙基、四异丙基和四丁基正钛酸酯)的影响。研究了合成条件与二氧化钛纳米粉末性质之间的关系,如热稳定性、相组成、结晶度、颗粒的形态和大小、BET比表面积以及掺杂剂的影响。烷基的性质强烈影响了所获得的氧化物粉末的主要特性,这一点通过热分析、X射线衍射、TEM和BET比表面积测量得到了证实。