Controllability study on the preparation of pure phase BiFeO₃ thin films by liquid phase self-assembled method

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• 作者：Xuan Ru Ren^a ; ^{renxuanru1986@163.com} ; Guo Qiang Tan^b ; Hong Yan Miao^b ; Zi Yu Li^b
• 关键词：Liquid phase self-assembled method ; OTS-SAMs ; Controllability study ; BiFeO3 ; Thin films ; Hard-Soft-Acid-Base principle
• 刊名：Applied Surface Science
• 出版年：2012
• 期刊代码：6_01694332
• 类别：ms
• 出版时间：1 August, 2012
• 卷：258
• 期：20
• 页码：8040-8045
• 文件大小：1027 K

摘要

Pure phase BiFeO₃ (BFO) thin films were prepared on the ITO/glass substrates covered with functionalized OTS self-assembled monolayers (SAMs) by controllable liquid phase self-assembled method. The hydrophobic surface of OTS-SAMs was changed into hydrophilic surface after UV irradiation, which is helpful to make BFO precursor solutions fully wet the substrate surface. A dense film was formed only on the hydrophilic silnaol group regions, which shows the selectively deposition of BFO precursors. Changing the pH value of BFO precursor solutions will affect the phase purity. The pure phase BFO thin films can be obtained under various pH values, which indicates that the liquid phase self-assembled method is controllable. All pure phase BFO films are dense, smooth, well-grown polycrystalline films, but the size of grains increased gradually along with the increase of pH values. The micropattern of BiFeO₃ film has clear edges. The possible growth mechanism of BFO thin films was discussed.