Photo-Stimulated Nanopattern Formation on Polarity Patterned Ferroelectric Surfaces

技术上的。这项研究的目的是为了更好地理解纳米图案铁电表面的光激发，并设计出形成纳米图案的方法。先前的研究证实，在硝酸银溶液中浸泡在极性图案化的铌酸锂表面时，光激发会导致银纳米线结构的形成，这种结构沿着锂上上下极性磁区的磁区边界形成。由于纳米线形成在极性边界，它们的宽度和厚度似乎不受光刻或磁区图案的限制，而是受到光化学现象的物理和化学的限制。由于铁电材料可以很容易地配置精确的极性图案，金属纳米结构可以形成延伸到数百微米甚至毫米的独特图案，具有纳米级的精度。本项目的目的是对光激发沉积纳米颗粒在具有极性的铁电表面上的应用有一个全面的认识和基础。这项研究涉及铁电材料纳米级表征的实验方法，制备清洁、钝化和可控屏蔽的表征表面的方法，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。非技术性。该项目涉及具有技术相关性的电子/光子材料科学专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发展纳米科学专业科学硕士(PSM-Nano)。该项目以两种方式对该方案作出贡献：1)制定一个研究项目，将一到两名PSM-Nano候选人与该项目中的一名研究生配对；2)为该小组开发两个研讨会。国际和平研究所成功地让本科生参与研究，并通过毕业典礼招募和指导妇女和少数族裔学生。

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.