Relation between Optical and Charge Properties of Individual Semiconductor Nanocrystals and Nanorods

在这项由化学部实验物理化学计划和材料研究部固态化学计划资助的项目中，克劳斯将研究电荷对单个胶体镉纳米晶(NC)和纳米棒(NR)光学性质的影响，以更好地了解这些材料的最基本性质，例如，它们特殊的“开-关”或闪烁行为。利用新型原子力显微镜(AFM)和倒置显微镜，研究了单个CdSe纳米碳管的电荷和发光图像之间的相关性。类似地，这项工作将尝试通过力显微镜来确定单个CdSe NRS的永久电偶极矩。单个近红外光谱的电荷和发光图像之间的关联可以用来确定电荷对其光学性质的影响。然而，只有充分了解电荷与光学和电学性质之间的关系，并尽量减少或消除电荷的有害影响，才能实现这一目标。这项工作将与学生和博士后研究助理一起完成。他们将在当代科学前沿领域获得宝贵的经验，这将使他们为深造或进入科学/技术劳动力市场做好准备。

In this project, funded by the Experimental Physical Chemistry Program of the Chemistry Division and the Solid State Chemistry Program of the Division of Materials Research, Krauss will investigate the effect of charges on the optical properties of single colloidal CdSe nanocrystals (NCs) and nanorods (NRs) in order to obtain a better understanding of the most fundamental properties of these materials, such as, for example, their exceptional "on-off" or blinking behavior. Using a novel atomic force microscope (AFM) and an inverted microscope, the correlation between charge and luminescent images of single CdSe NCs will be studied. Similarly, the work will attempt to determine the permanent electric dipole moment of single CdSe NRs by means of force microscopy. Correlations between charge and luminescent images for single NRs can be used to determine the effects of charges on their optical properties. CdSe NCs and NRs are highly promising materials with potentially great technological impacts, which, however, can be realized only if the relationship between electric charges and optical and electronic properties are fully understood, and the harmful effects of electric charges be minimized or removed. This work will be done with students and postdoctoral research associates. They will acquire valuable experience in a forefront area of contemporary science that will prepare them for advanced studies or entry in the scientific/technological workforce