A General, Efficient Method of Incorporation of Metal Ions into Ultrathin TiO2 Films

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• 作者：Junhui He ; Izumi Ichinose ; Shigenori Fujikawa ; Toyoki Kunitake ; and Aiko Nakao
• 刊名：Chemistry of Materials
• 出版年：2002
• 出版时间：August 2002
• 年：2002
• 卷：14
• 期：8
• 页码：3493 - 3500
• 全文大小：222K
• 年卷期：v.14,no.8(August 2002)
• ISSN：1520-5002

文摘

A general, efficient method was developed to incorporate a variety of second metal ionsinto ultrathin TiO₂ films. The thin films were first prepared by the surface sol-gel processfrom a mixture of the matrix-forming titanium alkoxide and template magnesium alkoxide.Mg²⁺ ion was removed by acid/base treatment, forming highly efficient and robustion-exchange sites. A large variety of metal ions, including alkaline, alkaline earth, transition,and rare earth elements, were then incorporated into the thin films by ion exchange withNa⁺. The amount of incorporation increased with increasing charge of the metal ions. Therate of the ion-exchange process was investigated in the case of Gd³⁺. The incorporated metalions were immobilized by thermal treatment at 450 C. The UV absorption edge of the TiO₂film was extended to the visible region by Fe³⁺ doping and calcination.