Hydrothermal conversion of Nb-anatase nanoparticles into layered titanates

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• 作者：Ljubica M. Nikoli&#x107 ; Marija Milanovi&#x107 ; Snež ; ana Nedi&#x107 ; Konstantinos Giannakopoulos ; Athanassios G. Kontos
• 关键词：A. Powders ; chemical preparation ; B. Spectroscopy ; B. Electron microscopy ; D. TiO₂ ; Layered Nb– ; titanates
• 刊名：Ceramics International
• 出版年：2011
• 出版时间：January 2011
• 年：2011
• 卷：37
• 期：1
• 页码：111-117
• 全文大小：585 K

文摘

The formation mechanism of layered titanates is described and Nb incorporation into these layers discussed. Titanate-based structures were obtained in highly alkaline solutions by the hydrothermal synthesis of Nb-anatase powder prepared by a modified sol–gel method. Samples were characterised by XRD, FT-IR and Raman spectroscopy, SEM and TEM (including EDS). The results confirmed the formation of layered trititanates, after 3 h of hydrothermal synthesis. Raman and EDS analyses have shown that Nb ions enter the layered structures. Results suggest the restructuring of the starting powder into individual trititanate nanosheets, as a possible formation mechanism of layered titanates, which proceeds with their roll up into a one-dimensional structure.