CAREER: Core-Shell Interfaces in Colloidal Quantum Dots.

职业：胶体量子点中的核壳界面。

• 批准号: 1255440
• 负责人: Colin Heyes
• 金额: $ 65万
• 依托单位: University of Arkansas
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-03-01 至 2018-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1255440&HistoricalAwards=false
• 关键词: CAREER; Core; Shell; Interfaces; Colloidal

Colin D. Heyes from the University of Arkansas is supported by the Macromolecular, Supramolecular and Nanochemistry Program in research focused on understanding how the optical and electrical properties of semiconductor quantum dots (QDs) are related to the structure of the core-shell interface at the single particle level. As the applications of bandgap-engineered core-shell nanomaterials approach the ultimate level of sensitivity - single particles and single photons - improving our understanding of the role of the critical core-shell interface is of paramount importance. In this proposal, expertise in the controlled synthesis of core-shell materials of varying composition combined with single particle spectroscopy and advanced high resolution electron microscopy techniques will be used to investigate how the trap states at the core-shell interface contribute to the charge carrier relaxation pathways by 1) synthesizing a range of core-shell and core-multishell QDs with different lattice mismatches and structurally characterizing these interfaces in single particles; 2) determining the ensemble and microscopic optical and electrical properties and correlating them to the structure of the core-shell interface; and 3) investigating how these properties are coupled to the shell-ligand interface and the local environment of the particle.Core-shell quantum dots have wide ranging significance for photovoltaics, optoelectronics, photocatalysis and advanced biological imaging applications. This broad range of applications stems from the fact that the shell can be tuned to either enhance emission or to promote charge carrier trapping, separation and interfacial transfer. In order to advance such a range of technological fields, enthusing and training students in the multi-disciplinary aspects of modern physical chemistry is needed. The education and outreach aspects of this proposal will address this issue on three fronts. 1) expose and enthuse undergraduates (juniors and seniors) from local primarily undergraduate institutions (PUIs) by holding a summer workshop that exposes them to modern physical chemistry techniques in the form of performing recently published experiments at the interface of chemistry, physics and biology; 2) use this workshop to recruit under-represented minorities by targeting PUIs with a large body of such students, and 3) disseminate videos of the workshop experiments being performed via the principal investigator's website, YouTube and Facebook to broaden the educational impact to other PUIs, high schools and the general public.

来自阿肯色大学的Colin D. Heyes得到了研究的大分子，超分子和纳米化学计划的支持，重点是了解半导体量子点（QD）的光学和电气性能与单个粒子级别的核心壳界面的结构有关。随着带状隙工程的核心壳纳米材料的应用接近最终灵敏度水平 - 单个颗粒和单光子 - 提高了我们对临界核心壳界面的作用的理解至关重要。在这项建议中，将使用单个颗粒光谱和高级高分辨率电子显微镜技术结合的核心壳材料的控制合成的专业知识，以研究核心壳界面处的陷阱状态如何促进电荷载体放松途径，从而通过1）与核心式和核心形式的范围进行了不同颗粒； 2）确定集合和显微镜光学和电气性能，并将它们与核心壳界面的结构相关联； 3）研究这些特性是如何与壳体界面和粒子的局部环境耦合的。核壳量子点对光伏，光电，光催化，光催化和先进的生物成像应用具有广泛的重要性。这种广泛的应用范围源于以下事实：壳可以调整以增强发射或促进荷载载流子捕获，分离和界面转移。为了促进这样一系列技术领域，需要在现代物理化学的多学科方面进行热情和培训学生。该提案的教育和外展方面将在三个方面解决这个问题。 1）通过举办一个夏季研讨会，以在化学，物理学和生物学界面上表演，以表演最近发表的实验的形式来揭露并揭露主要是本科机构（PUI）的本科生（PUI）的本科生（PUI）； 2）使用此研讨会通过针对大量此类学生的PUI来招募代表性不足的少数群体； 3）传播通过首席调查员的网站，YouTube和Facebook进行研讨会实验的视频，以扩大对其他PUI，高中和普通公众的教育影响。