Direct observation of ferroelectricity in quasi-zero-dimensional barium titanate nanoparticles.
Direct observation of ferroelectricity in quasi-zero-dimensional barium titanate nanoparticles.
复制标题
DOI：
10.1002/smll.200600297
复制
发表时间：
2006-12
期刊：
影响因子：
13.3
通讯作者：
S. Ray;Yury V. Kolen’ko;D. Fu;R. Gallage;N. Sakamoto;Tomoaki Watanabe;M. Yoshimura;M. Itoh
中科院分区：
文献类型：
--
作者：
S. Ray;Yury V. Kolen’ko;D. Fu;R. Gallage;N. Sakamoto;Tomoaki Watanabe;M. Yoshimura;M. Itoh
从技术的角度来看，理解零维系统中的铁电响应行为，即在三维量子限制下，是一项重要的任务，这可能会导致电子器件的进一步小型化。显然，对理想的零维纳米粒子进行直接电测量是一个非常重要的过程，尽管已经发表了一些采用间接方法的实验报告。然而，最近开发的piezoreA力显微镜（PFM）技术的使用，结合仔细选择的基板和适当的样品制备的测量，使得有可能实验观察到这种现象的近理想的无量纲系统。铁电（FE）系统属于一类非常重要的材料，因为利用它们来制造铁电随机存取存储器（FERAM）和微机电系统（MEMS）的可能性，这源于它们相关的热电，压电和铁电特性。与块状铁电材料相比，低维结构有望在很大程度上提高此类器件的效率，因此，电子工业的未来发展强烈要求清楚地了解性能与颗粒尺寸之间的关系。关键问题是铁电相变和多稳态在较低维度是否仍然存在。以前的理论研究[1]预测，偏振值在二维（薄膜）中应该较小，并且低于一定的
Understanding the behavior of ferroelectric response in zero-dimensional systems, that is, under three-dimensional quantum confinement, is an important task from the technological point of view, which might lead to further miniaturization of electrical devices. Evidently, carrying out direct electrical measurements on ideal zero-dimensional nanoparticles is an extremely nontrivial process, although several experimental reports employing indirect methods have been published. However, the use of recently developed piezoreA force microscopy (PFM) techniques, in conjunction with the careful choice of substrates and appropriate preparation of samples for measurements, makes it possible to experimentally observe this phenomenon on nearly ideal dimensionless systems. Ferroelectric (FE) systems belong to an extremely important class of materials because of the possibility of utilizing them for fabricating ferroelectric random access memories (FERAMs) and microelectromechanical systems (MEMS), which stem from their associated pyro-, piezo-, and ferroelectric properties. In comparison with bulk ferroelectric materials, lower-dimensional structures promise to increase the efficiency of such devices to a large extent and, therefore, future development of the electronics industry strongly requires a clear understanding of the relationship between properties and particle sizes. The key question is whether the ferroelectric phase transitions and multistable states still exist in lower dimensions or not. Previous theoretical studies [1] predicted that polarization values should be smaller in two dimensions (thin films) and below a certain