Synthetic Mechanism for Semiconductor Nanocrystals and Implications for their Single Particle Photophysics

托德教授D.罗切斯特大学的Krauss得到化学系大分子、超分子和纳米化学（MSN）项目的支持，以了解硒化镉（CdSe）量子点（QD）化学合成背后的基本机制，并使用最先进的光谱和显微技术表征QD表面化学和物理性质之间的关系。预计将确定单个CdSe量子点的表面化学、表面陷阱电荷和光致发光性质之间的关系。尽管经过三十多年的研究，控制半导体量子点合成的基本化学机制仍然未知。作为这项研究的结果，可以开发出用于合成QD的合理程序，其基本上可按几个数量级扩展到工业规模，并且在与当前化学制造相容的低得多的温度下进行。大规模合成半导体量子点，特别是那些具有明亮和稳定的光致发光的量子点，可以在生物学、量子光学和光电子学中找到广泛的用途。拟议的研究还规定了下一代物理化学家的教育和培训，包括妇女和代表性不足的少数民族。由该项目支持的学生将通过与罗切斯特市学区的“一所学校”计划，在当地社区组织和指导外联和教育工作，并参加在罗切斯特博物馆和科学中心举行的精选“纳米日”活动。

Professor Todd D. Krauss of the University of Rochester is supported by the Macromolecular, Supramolecular, and Nanochemistry (MSN) Program in the Division of Chemistry to understand the fundamental mechanism behind the chemical synthesis of cadmium selenide (CdSe) quantum dots (QDs) and to characterize the relationship between QD surface chemistry and photophysical properties using state-of-the-art spectroscopic and microscopic techniques. It is expected that the relationship between surface chemistry, surface trapped charge, and photoluminescence properties for individual CdSe QDs will be determined. Despite over three decades of research, the fundamental chemical mechanism governing the synthesis of semiconductor QDs remains unknown. As a result of this research, rational procedures for the synthesis of QDs may be developed that are fundamentally scalable by several orders of magnitude to industrial scales, and that take place under much lower temperatures compatible with current chemical manufacturing. Large-scale synthesis of semiconductor QDs, especially those with bright and stable photoluminescence, may find broad use in biology, quantum optics, and optoelectronics. The proposed research also provides for the education and training of the next generation of physical chemists, inclusive of women and underrepresented minorities. Students supported by this project will organize and direct outreach and educational efforts in the local community through the Adopt-a-School program with the Rochester city school district, and participate in select "NanoDays" events at the Rochester Museum and Science Center.