Spectroscopic Studies of Layered Solids

层状固体的光谱研究

• 批准号: 8818371
• 负责人: Anthony Francis
• 金额: $ 16.54万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-02-01 至 1992-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8818371&HistoricalAwards=false
• 关键词: Spectroscopic; Studies; Layered; Solids

The lamellar transition metal phosphorus trichalcogenides form an important family of two-dimensional semiconducting materials. These compounds are of interest to researchers because of their highly two-dimensional physical properties and their unusual solid-state chemistry. The layered lattices exhibit solid-state "intercalation" reactions in which molecules insert between lattice planes. The process of intercalation often results in dramatic and unpredictable modification of the chemical and physical properties of the host lattice. Although the intercalation reactions have been studied for more than two decades, many interesting questions of mechanism and structure in the solid-state intercalation chemistry of these materials remain unresolved. The research described in this proposal is directed toward an improved understanding of the mechanism of intercalation in these materials. Charge balance is an important constraint to the intercalation of cationic species and may be achieved by elimination of lattice cations. It is proposed to utilize electron spin resonance (ESR) spectroscopy to study the complex equilibrium between inter- lamellar and intra-lamellar cations. In many reactions a mechanism is involved in which an electron is transferred to an unidentified site in the host lattice. They propose to utilize photoluminescence and optically detected magnetic resonance (ODMR) spectroscopy to determine the lattice reduction site.

层状过渡金属磷三硫属化物形成层状过渡金属磷三硫属化物， 二维半导体材料的重要家族。 研究人员对这些化合物感兴趣，因为它们具有 高度二维的物理性质及其不寻常的 固态化学 层状晶格表现出固态 “嵌入”反应，分子插入到 晶格平面 插层过程通常导致 化学物质的剧烈和不可预测的变化， 主晶格的物理性质。 虽然 插层反应已经研究了两个以上 几十年来，许多有趣的机制和结构问题， 这些材料固态嵌入化学性质保持不变 悬而未决 本提案中所述的研究旨在 为了更好地理解 嵌入这些材料中。 电荷平衡是插层的重要约束。 并且可以通过消除晶格来实现 阳离子。 建议利用电子自旋共振（ESR） 光谱学研究之间的复杂平衡， 层状和层内阳离子。 在许多反应中， 涉及电子转移到电子的机制 在主晶格中有一个未知的位置。 他们建议利用 光致发光和光检测磁共振 （ODMR）光谱以确定晶格还原位点。