片状微晶的软化学合成和界面自组装制备择优取向无铅压电材料的研究

项目名称： 片状微晶的软化学合成和界面自组装制备择优取向无铅压电材料的研究

项目编号： No.51202204

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 无机非金属材料学科

项目作者： 薛昊

作者单位： 厦门大学

项目金额： 25万元

中文摘要： 钙钛矿型压电晶体具有典型的各向异性特征，本项目致力于研究钙钛矿型无铅压电微晶体的形貌和取向调控生长，采用软化学方法，通过拓扑化学转变合成具有片状形貌和压电性能优势取向的钙钛矿型压电微晶体。根据片状晶体形貌特征，通过水/油界面张力作用，实现片状微晶体在界面的自组装，获得具有高度取向性的单层膜并转移到基片上。以此单层膜作为种子层，通过丝网印刷和溶胶-凝胶成膜方法制备高取向性的厚膜和薄膜材料，从而获得压电性能的提高。系统地研究软化学法控制钙钛矿型微晶体形貌和取向的反应机制，探索普适于钙钛矿型材料的微晶合成方法。研究界面组装的界面张力作用机制以及膜合成中的外延取向性生长的机理和工艺控制。

中文关键词： 压电微晶体；择优取向；界面组装；能量收集；

英文摘要： The piezoelectric crystals with perovskite structure presents typical anisotropy. Our research work focus on the tailored growth of perovskite micro-crystalline with special morphology and orientation, and by soft chemical method, through topochemical conversion synthesize the piezoelectric micro-crystallines with plate like morphology and special orientation. On the basis of the morphology, under effect of the water/oil interfacial force, the perovskite platelets could be self-assembled into high oriented monolayered film on the interface of water/oil and be transferred onto the substrates. Using the self-assembled monolayered film as seed layer, we would prepared highly oriented thick films and thin films by screen printing and sol-gel spin coating, respectively to improve the piezoelectric properties. The synthesis mechanism of controling the morphology and orientation of perovskite crystallines by soft chemical method would be investigated systematically. we also pay attention to the study of the interfacial assembly mechanism,the epitaxial growth of thick films and thin films.

英文关键词： Piezoelectric micro-crystal；Preferred orientation；Interfacial assembly；Energy harvesting；