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.

阿肯色大学的 Colin D. Heyes 得到了高分子、超分子和纳米化学项目的支持，其研究重点是了解半导体量子点 (QD) 的光学和电学特性与核壳界面结构之间的关系。单粒子水平。随着带隙工程核壳纳米材料的应用接近极限灵敏度水平（单粒子和单光子），提高我们对关键核壳界面作用的理解至关重要。在该提案中，将利用不同成分的核-壳材料的受控合成专业知识，结合单粒子光谱学和先进的高分辨率电子显微镜技术来研究核-壳界面处的陷阱态如何有助于载流子弛豫。 1) 合成一系列具有不同晶格失配的核-壳和核-多壳量子点，并在单个粒子中对这些界面进行结构表征； 2）确定系综和微观光学和电学性质，并将它们与核-壳界面的结构相关联； 3) 研究这些特性如何与壳-配体界面和粒子的局部环境耦合。核-壳量子点对于光伏、光电子、光催化和先进生物成像应用具有广泛的意义。这种广泛的应用源于这样一个事实：壳可以被调节以增强发射或促进电荷载流子捕获、分离和界面转移。为了推进一系列技术领域的发展，需要对现代物理化学的多学科方面充满热情并对其进行培训。该提案的教育和推广方面将从三个方面解决这个问题。 1) 通过举办暑期研讨会，让本地本科院校 (PUI) 的本科生（大三和大四）接触现代物理化学技术，并通过在化学、物理和生物学领域进行最近发表的实验来激发他们的兴趣； 2) 利用此研讨会，通过针对拥有大量此类学生的 PUI 来招募代表性不足的少数群体，以及 3) 通过主要研究者的网站、YouTube 和 Facebook 传播研讨会实验的视频，以扩大对其他 PUI 的教育影响、高中和公众。