Photo-Stimulated Nanopattern Formation Dynamics on Ferroelectric Surfaces

技术：该项目是关于在极性图案化铁电材料表面通过光诱导过程形成纳米图案。铁电材料的纳米级表面特性的特点是使用光电子发射显微镜（PEEM）和扫描探针的方法。该研究项目结合化学，光增强和热的方法来制备极性图案化的铁电表面与控制筛选。原位表面处理和沉积薄氧化物膜可以提供具有增强电场的均匀终止表面，其反映铁电畴的纳米粒子。表面态、缺陷和极化束缚电荷导致能带弯曲效应，这有助于光诱导沉积过程。第二种光致纳米图案形成的方法是将沉积在铁电表面的二氧化钒结合起来，驱动绝缘体-金属转变，然后进行纳米图案化。非技术性：该项目涉及的科学是纳米图案形成方法的基础，可能会影响电子或传感器技术。 跨学科的研究环境将使参与这项研究的研究生和本科生获得专业知识，考虑从事电子或传感器技术开发。该项目还提供综合项目，将研究生研究人员与ASU纳米科学专业科学硕士的候选人配对。K-12教育推广是通过亚利桑那州立大学的科学是有趣的计划和铁电材料的新示范将成为方案的一部分，介绍给凤凰城地区的K-12学生。

Technical: This project is on nanopattern formation enabled by photo-induced processes at the surface of polarity patterned ferroelectric materials. The nanoscale surface properties of the ferroelectric materials are characterized using photo electron emission microscopy (PEEM) and scanned probe approaches. The research project combines chemical, photo-enhanced and thermal approaches to prepare polarity patterned ferroelectric surfaces with controlled screening. In situ surface processing and deposition of thin oxide films can provide uniformly terminated surfaces with enhanced electric fields which reflect the nanopatterns of the ferroelectric domains. Surface states, defects and the polarization bound charge lead to band bending effects which contribute to the photo-induced deposition process. A second approach for photo-induced nanopattern formation combines vanadium dioxide deposited on ferroelectric surfaces to drive an insulator-metal transition which follows the nanopatterned domains.Nontechnical: The project addresses the science that underpins approaches for nanopattern formation which could impact electronics or sensor technologies. The interdisciplinary research environment will enable the graduate and undergraduate students involved with this research to gain the expertise to consider a career in electronics or sensor technology development. The project also provides integrated projects that pair graduate student researchers with candidates of the ASU Professional Science Masters in Nanoscience. The K-12 education outreach is through the ASU Science is Fun program and a new demonstration on ferroelectric materials will become part of program for presentation to Phoenix area K-12 students.