Novel Synthetic Routes to Main Group Inorganic Solids

9902417Kouvetak这一多学科计划专注于合成新的、具有重要技术意义的无机材料和薄膜，其中包含第13、14和15族元素。主要工作包括开发全新的Si-Ge-C合金和化合物半导体，用于硅基带隙工程和晶格匹配应用。宽禁带光电氮化物和碳化物(包括GaN)是由化学设计的无C-H和N-H前驱体制备的。这项工作的目标是探索无缺陷材料的生长，并使用新的合成方法开发不寻常的纳米结构形态(量子点和线)。整个项目中广泛使用了包括透射电子显微镜、X射线衍射仪、RBS和其他技术(包括原位方法)的表征，以提供关于薄膜微结构和异质外延生长质量的快速反馈，从而最终导致更好的合成路径设计。此外，以成分相似的相为前驱体，在高压下合成了Li-Be-B-C-N-O系超硬类金刚石材料。基于新型无机碳氮化合物B、Al、Ga、In和Tl的相关纳米孔骨架体系也通过溶液方法被开发出来。这些化合物有望在吸附和催化方面具有有用的性质。这项研究的一个独特方面是设计和合成概念上简单的无机化合物，这些化合物提供了开发用传统方法无法获得的有用固体所需的构件。这项工作跨越了广泛的跨学科项目，非常适合为本科生、研究生和博士后研究人员提供广泛的准备和最先进的技能。培养高素质的未来新材料合成科学家和工程师是我们社会保持其技术优势的关键。我们希望提供新设备化学和物理方面的基础知识，从而为新兴和未来的技术，如下一代计算机、显示器和通信系统做出重要贡献。

9902417KouvetakisThis multidisciplinary program focuses on synthesis of new and technologically important inorganic materials and thin films incorporating elements of groups 13, 14 and 15. A major part of the work involves development of completely novel Si-Ge-C alloys and compound semiconductors which are intended for silicon-based bandgap engineering and lattice matching applications. Wide bandgap optoelectronic nitrides and carbides (including GaN) are prepared from chemically designed C-H- and N-H-free precursors. The goal of this effort is to explore growth of defect-free materials and to develop unusual nanostructured morphologies (quantum dots and wires) using novel synthesis methods. Characterizations involving TEM, XRD, RBS and other techniques (including in situ methods) are used extensively throughout the project to provide rapid feedback about the film microstructure and the quality of the heteroepitaxial growth, thus ultimately leading to better design of the synthetic pathways. In addition, extreme-hardness diamond-like materials based on the Li-Be-B-C-N-O system are synthesized at high pressure using compositionally analogous phases as precursors. Related nanoporous framework systems based on new inorganic C-N compounds of B, Al, Ga, In and Tl are also developed via solution methods. These are expected to have useful properties in adsorption and catalysis. A unique aspect of the research is the design and synthesis of conceptually simple inorganic compounds that provide the necessary building blocks to develop useful solids that cannot be obtained by conventional methods.The work spans a wide range of interdisciplinary projects which are well suited to provide broad preparation and state-of-the-art skills to undergraduate, graduate, and postdoctoral researchers. Training of highly-qualified future scientists and engineers in new materials synthesis is crucial for our society to maintain its technological edge. We expect to provide fundamental knowledge in novel device chemistry and physics, and thus make important contributions to emerging and future technologies such as the next generation of computers, displays, and communication systems.