Structure-Optoelectronic Property Relationships in Homogeneous and Heterogeneous/Gradient Alloyed Colloidal I-(II)-III-VI Quantum Dots

均质和异质/梯度合金胶体 I-(II)-III-VI 量子点的结构-光电性质关系

• 批准号: 2304949
• 负责人: Colin Heyes
• 金额: $ 53.56万
• 依托单位: University of Arkansas
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-07-01 至 2026-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2304949&HistoricalAwards=false
• 关键词: Structure; Optoelectronic; Property; Relationships; Homogeneous

With support from the Macromolecular, Supramolecular and Nanochemistry Program (MSN) in the Division of Chemistry and the Established Program to Stimulate Competitive Research (EPSCoR), Colin Heyes and Robert Coridan of the University of Arkansas are combining advanced chemical synthesis and analysis tools to characterize the structural, optical and electronic properties of semiconducting nanoparticles (2 – 10 nanometers in diameter) composed of three or more elements. These elements replace toxic elements that are commonly used in semiconducting nanoparticles, such as cadmium, with more benign ones, such as copper, indium and zinc. However, much less is known about how to control the optical and electronic properties of nanoparticles incorporating these elements. Heyes, Coridan and their students are addressing this lack of knowledge by systematically varying the chemical synthesis of the nanoparticles and analyzing how this affects the resulting atomic structure and, in turn, the optical and electronic properties. These discoveries could lead to new materials for use in light emitting diodes, lasers, solar energy conversion, catalysis, chemical/biochemical sensors, and biomedical imaging. This support will also be used to help recruit and train underrepresented and first generation undergraduate students through summer workshops to be held at the University of Arkansas.Under this award, Drs. Heyes, Coridan and their students will study copper-(zinc)-indium chalcogenide and silver-(zinc)-indium chalcogenide nanoparticle quantum dots (QDs) in which the distribution and local environment of the CuInE2 or AgInE2 (E = S, Se, Te) emitting sites is varied by the synthesis conditions. Zinc is known to ion exchange with copper and indium in the CuInE2 lattice to form alloyed Cu(Zn)InE2 QDs or with silver and indium in the AgInE2 lattice to form alloyed Ag(Zn)InE2 QDs. Two important gaps in our understanding of these types of QDs are (i) What is the mechanism underlying this ion-exchange/alloying and (ii) what is the relationship between the structure resulting from the specific reaction conditions and the electronic structure/exciton decay pathways. This research will set out to examine these knowledge gaps by systematically synthesizing homogeneously alloyed and heterogeneous/gradient alloyed QDs. Particular attention will be paid to the heterogeneity in optical emission properties at the single nanoparticle level and in correlating these properties to atomic level structural information obtained using X-ray diffraction and spectroscopy techniques.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

在化学划分和刺激竞争性研究的既定计划（EPSCOR）的大分子，超分子和纳米化学计划（MSN）的支持下，阿肯色大学的Colin Heyes和Robert Coridan在结合了高级化学合成和分析工具中，以表征了ne and nnan neanticties of Advance of Advance of Advical and nnan nnan and and nnan and nnan and nnan ninan的nis ninan ninan ninantipers of Semical of nnan and and and。由三个或更多元素组成。这些元素取代了在半导体纳米颗粒（例如镉）中常用的有毒元素，其含量更良性，例如铜，鉴别和锌。但是，如何控制编码这些元素的纳米颗粒的光学和电子特性知之甚少。 Heyes，Coridan及其学生通过系统地改变了纳米颗粒的化学合成，并分析了这如何影响所得的原子结构以及光学和电子特性，从而解决了这种缺乏知识。这些发现可能导致新材料用于发射二极管，激光器，太阳能转化，催化，化学/生化传感器和生物医学成像。该支持还将用于帮助招募和培训代表性不足和一年级的本科生，并通过夏季讲习班在阿肯色大学举行。 Heyes，Coridan和他们的学生将研究铜（锌） - 印度印度辣椒和银（锌） - 辣椒剂纳米粒子量子点（QD），其中cuine2或agine2或agine2（e = s，se，se，te）发射位点的分布和局部环境通过合成条件而变化。已知锌与Cuine2晶格中的铜和粘液交换以形成合金的Cu（Zn）Ine2 QD，或与Agine2晶格中的银和IX型形成合金的AG（ZN）INE2 QD。我们对这些类型QD的理解的两个重要差距是（i）该离子交换/合金的基础机制是什么，以及（ii）由特定反应条件与电子结构/激子衰减途径产生的结构之间的关系是什么。这项研究将着手通过系统合成同质合金和异质/梯度合金QD来检查这些知识差距。特别关注单个纳米颗粒级别的光学发射属性的异质性，并将这些属性与使用X射线衍射和光谱技术获得的原子级结构信息相关联。这奖反映了NSF的立法任务，并以基础知识的优点和广泛的评价来评估，并被认为是宝贵的支持。