Photo-Stimulated Nanopattern Formation on Polarity Patterned Ferroelectric Surfaces

技术。本研究的目的是为了更好地理解极性图案铁电表面的光激发，并设计纳米图案形成的方法。先前的研究表明，当浸入硝酸银水溶液时，极性图案的铌酸锂表面的光激发会导致沿铌酸锂上和下极性区域边界形成银纳米线结构。由于纳米线是在极性边界形成的，因此它们的宽度和厚度似乎不受光刻或畴图案的限制，而是受光化学现象的物理和化学的限制。由于精确的极性模式可以很容易地在铁电材料中配置，金属纳米结构可以形成独特的模式，延伸到数百微米甚至毫米，具有纳米级精度。本项目旨在全面理解并为在极性图案铁电表面上精确纳米图案的光激发沉积奠定基础。该研究涉及铁电材料纳米级表征的实验方法，通过控制筛选制备清洁、钝化和表征表面的方法，改进光刺激沉积的工艺，以及表面增强拉曼散射（SERS）衬底的开发。非技术。本项目涉及电子/光子材料科学中具有技术相关性的主题领域的基础研究问题。这项研究有可能对电子设备和传感器的发展产生重大影响。参与这项研究的研究生和本科生将获得与电子领域职业相关的专业知识。亚利桑那州立大学物理系的一项新举措是纳米科学专业科学硕士（PSM-Nano）的发展。该项目以两种方式为该计划做出贡献：1)开发一个研究项目，将一到两名PSM-Nano候选人与该项目中的一名研究生配对，2)为小组开发两个研讨会。PI成功地让本科生参与研究，并在研究生阶段招收和指导妇女和少数民族学生。

Technical. The goal of this research is to reach greater understanding of photo excitation of po-larity patterned ferroelectric surfaces and to devise approaches for nanopattern formation. Prior research established that photo excitation of a polarity patterned lithium niobate surface while immersed in an aqueous silver nitrate solution leads to the formation of silver nanowire struc-tures that form along domain boundaries of up and down polarity domains on lithium niobate. Since the nanowires form at the polarity boundaries, their width and thickness appear to not be limited by lithography or the domain pattern, but by the physics and chemistry of photo-chemical phenomena. Since precise polarity patterns can be readily configured in ferroelectric materials, metallic nanostructures can be formed into unique patterns that extend over hundreds of microns or even millimeters with nanometer scale precision. This project aims for a comprehensive un-derstanding and a basis for the photo-excited deposition of precise nanopatterns on polarity pat-terned ferroelectric surfaces. The research involves experimental approaches for nanoscale char-acterization of ferroelectric materials, approaches to prepare clean, passivated, and characterized surfaces with controlled screening, processes for improved photo-stimulated deposition, and the development of substrates for surface enhanced Raman scattering (SERS). Non-Technical. The project addresses fundamental research issues in a topical area of elec-tronic/photonic materials science having technological relevance. There is potential that the re-search could substantially impact the development of electronic devices and sensors. Graduate and undergraduate students involved with this research will gain expertise relevant to careers in the electronics field. A new initiative of the ASU Department of Physics is the development of a Professional Science Masters in Nanoscience (PSM-Nano). This project contributes to the pro-gram in two ways: 1) The development of a research project that will pair one or two of the PSM-Nano candidates with one of the graduate students in this project, and 2) the development of two seminars for the group. The PI has been successful in involving undergraduates in re-search and in recruiting and mentoring women and minority students through their graduate de-gree.