Structural characterizations of sol-gel synthesized TiO₂ and Ce/TiO₂ nanostructures

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• 作者：A. Niltharach^a ; ^b ; S. Kityakarn^b ; A. Worayingyong^b ; J.T- Thienprasert^c ; ^d ; W. Klysubun^e ; P. Songsiriritthigul^e ; ^f ; S. Limpijumnong^e ; ^f ; ^g ; ^{sukit@sut.ac.th}
• 关键词：Sol&ndash ; gel process ; X-ray diffraction ; X-ray absorption ; Nanostructure ; TiO2 ; Phase determination
• 刊名：Physica B
• 出版年：2012
• 期刊代码：53_09214526
• 类别：ph
• 出版时间：1 August, 2012
• 卷：407
• 期：15
• 页码：2915-2918
• 文件大小：404 K

摘要

Mixed phase TiO₂ and Ce/TiO₂ samples were synthesized by a sol-gel method using different hydrolysis conditions. In pure TiO₂ samples, traditional X-ray diffraction (XRD) and Ti K-edge synchrotron X-ray absorption near edge structures (XANES) independently revealed their anatase/rutile phase ratios. XANES results further revealed a substantial amount of Ti atoms existed in other forms beside anatase and rutile TiO₂ in the sample synthesized by the low hydrolysis condition. An increase in the extent of the hydrolysis during the synthesis leads to an increased rutile ratio and a reduction in other forms. In Ce/TiO₂ samples, the crystal sizes were too small for XRD characterization. Only XANES could be used to characterize their phase ratios. It is found that adding Ce impedes rutile formation; leading to increased anatase ratio. The difference in the fundamental aspects of XRD and XANES techniques in providing the phase ratios is discussed.