Synthesis and Properties of Mesostructured Thin Films

介孔结构薄膜的合成与性能

• 批准号: 0103952
• 负责人: Jeffrey Zink
• 金额: $ 42万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-07-01 至 2007-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0103952&HistoricalAwards=false
• 关键词: Synthesis; Properties; Mesostructured; Thin; Films

This project concerns the synthesis and properties of mesostructured thin films of metal oxides based on surfactant and block copolymers as the structure-directing agents. A central concept involves the chemically different and spatially separated regions of the mesostructure. On the molecular level, the mesostructures consist of two distinct regions: the "framework" that is formed by the sol-gel metal oxide, and the "organic" region that is formed by the template. The project contains two complementary objectives. The first objective is to deliberately place dopants in specified regions of transparent mesostructured silica. The location of specific molecules will be characterized by optical spectroscopy, and the spatial relationships between multiple dopants will be probed by energy transfer. The second objective is to synthesize semiconductor frameworks in mesostructured films and to characterize their formation processes. Mesostructured films of tin dioxide will be synthesized and optical probes will be used to monitor and interpret the dynamics of both micelle and metal oxide framework formation. The optical methods to be used provide 50 nm resolution of the dynamic transformations taking place in a time frame of a few seconds over film dimensions of several centimeters. The experiments are directed at determining the evolution that occurs from the dissolved "unimer" (individual dissolved copolymer molecules) to the micelle to the mesostructured metal oxide film. These dynamic measurements will correlate the chemical changes and structural development occurring as the film is deposited. The second set of experiments will monitor the development of the semiconductor framework. Electron transport in mesostructured films will be measured and interpreted. %%%The prospects for creating mesostructured films with unique electrical and optical properties. The development of these novel materials will have a significant impact on the fields of optical physics, and device areas such as sensors for medical applicatons (e.g., implants and in vivo and in vitro biosensors). Students trained in these areas will compete very favorably in the job market. This project is to be funded jointly by the Chemistry Division and the Division of Materials Research.

本计画系关于以表面活性剂及嵌段共聚物为结构导向剂之金属氧化物介观结构薄膜之合成与性质。 一个中心概念涉及介观结构的化学上不同和空间上分离的区域。 在分子水平上，介观结构由两个不同的区域组成：由溶胶-凝胶金属氧化物形成的“框架”和由模板形成的“有机”区域。 该项目包含两个相辅相成的目标。 第一个目标是故意将掺杂剂放置在透明介观结构二氧化硅的特定区域中。 特定分子的位置将通过光谱学来表征，并且多种掺杂剂之间的空间关系将通过能量转移来探测。第二个目标是在介观结构薄膜中合成半导体框架并表征其形成过程。 介观结构的二氧化锡薄膜将被合成和光学探针将被用来监测和解释胶束和金属氧化物框架形成的动力学。 所使用的光学方法提供了在几秒钟的时间范围内在几厘米的膜尺寸上发生的动态变换的50 nm分辨率。 实验是针对确定从溶解的“单聚物”（单独溶解的共聚物分子）到胶束再到介观结构的金属氧化物膜的演变。 这些动态测量将使膜沉积时发生的化学变化和结构发展相关联。 第二组实验将监测半导体框架的发展。 介观结构薄膜中的电子输运将被测量和解释。 创造具有独特电学和光学特性的介观结构薄膜的前景。这些新型材料的发展将对光学物理学领域和器件领域如用于医疗应用的传感器（例如，植入物以及体内和体外生物传感器）。在这些领域受过训练的学生将在就业市场上竞争非常有利。 该项目将由化学司和材料研究司共同资助。