EAGER: Silicon Graphane Analogues

技术摘要：这项研究由固态和材料化学计划支持，其主要目标是开发制备有机钝化的单原子硅片的合成方法，评估其在空气和水环境中的稳定性，并研究其体相和单片的光学和电学性质。这些有机端基硅片将通过层状锌硅相的非水脱嵌和表面功能化过程相结合来合成。采用X射线衍射、拉曼光谱、傅里叶变换红外光谱、X射线光电子能谱、原子力显微镜、扫描电子显微镜和透射电子显微镜等测试手段对材料的结构和形貌进行了表征，并对材料的长期空气和水稳定性进行了评价。这些层状硅石墨烷类似物的光学和电学性质将通过在块状颗粒和单个孤立薄片上的吸收、荧光和电子测量来表征。这些单原子厚的硅石墨烷类似物有望是空气和水稳定的，与体硅和其他二维层相比具有许多优点，包括具有直接和可调的带隙，以及在对电导率影响最小的情况下进行共价功能化的能力，从而使它们有可能成为多种应用的通用构件。非技术摘要：零维(富勒烯)、一维(纳米管)和二维(石墨烯)碳的同素异形体的发现开辟了整个研究领域，并最终获得了两项诺贝尔奖。尽管如此，硅仍然是我们这个时代最普遍、技术上最重要的材料。这项研究计划的重点是了解如何合成单原子厚度的硅片，这些硅片由有机分子保护，以确保空气和水的稳定性，并评估它们的光学和电子性能。考虑到硅在计算、光伏、热电、电池电极、自旋电子学和化学/生化传感方面的前景和应用，创造出具有根本独特性质的空气和水稳定的新型硅同素异形体可以在许多技术中拥有巨大的潜力，包括可再生能源技术。该计划将与俄亥俄州立大学针对高中生、本科生和普通公众的教育和外展活动相结合。PI积极参与指导本科生和研究生水平上代表不足的群体，鼓励他们发展为下一代材料创新者。最后，该计划将通过与科学与工业中心(COSI)博物馆和州科学奥林匹克计划的合作计划，支持旨在培养K-12级别对材料和能源相关科学、技术和工程兴趣的社区外联活动。

TECHNICAL ABSTRACT:The primary goals of this research supported by the Solid State and Materials Chemistry program are to develop the synthetic methodology for creating organic-passivated single atom thick sheets of silicon, evaluate their stability in air and water environments, and study their optical and electronic properties both in the bulk and as single isolated sheets. These organic-terminated silicon sheets will be synthesized by combining nonaqueous deintercalation of layered Zintl silicon phases with surface functionalization processes. A combination of X-ray diffraction, Raman, FTIR, XPS, AFM, SEM, and TEM measurements will be employed to characterize the structure and morphology as well as evaluate the long-term air and water stability of these materials. The optical and electronic properties of these layered silicon graphane analogues will be characterized using absorption, fluorescence, and electronic measurements on bulk pellets and single isolated sheets. These single atom thick silicon graphane analogues are expected to be air- and water-stable, and possess numerous advantages compared to bulk silicon and other two-dimensional layers, including having a direct and tunable band gap, as well as the capability for covalent functionalization with minimal disruption to conductivity, thus potentially making them a versatile building block for a multitude of applications.NON-TECHNICAL ABSTRACT: The discovery of allotropes of carbon that are zero-dimensional (fullerene), one-dimensional (nanotubes), and two-dimensional (graphene), has opened up entire fields of research and ultimately culminated in two Nobel prizes. Still, silicon remains the most ubiquitous and technologically significant material of our time. This research program focuses on understanding how to synthesize single atom thick sheets of silicon that are protected with organic molecules for air- and water- stability, and evaluationg their optical and electronic properties. Considering the promise and application of silicon in computing, photovoltaics, thermoelectrics, battery electrodes, spintronics, and chemical/ biochemical sensing, the creation of new air- and water-stable allotropes of silicon with fundamentally unique properties can hold great potential in numerous technologies, including renewable energy technologies. This program will be integrated with educational and outreach activities at Ohio State which target high school students, undergraduates, and the general public. The PI is actively involved in mentoring underrepresented groups at both the undergraduate, and graduate levels, encouraging their development as the next generation of materials innovators. Finally, this program will support community outreach activities designed to foster interest in materials- and energy-related science, technology, and engineering at the K-12 level, via collaborative programs with the Center of Science and Industry (COSI) museum, and the state Science Olympiad program.