Creating Functional Nanocrystal-Molecule Interfaces for Spin-triplet Energy Transfer

创建用于自旋三重态能量转移的功能纳米晶体分子界面

• 批准号: 2003735
• 负责人: Sean Roberts
• 金额: $ 45万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2003735&HistoricalAwards=false
• 关键词: Creating; Functional; Nanocrystal; Molecule; Interfaces

The Macromolecular, Supramolecular, and Nanochemistry Program in the Chemistry Division supports Professor Sean T. Roberts at the University of Texas at Austin to study light-triggered processes that occur in materials. Light provides the energy that fuels plant growth via photosynthesis, is used in electronics for wireless communication, and even forms the basis for noninvasive medical treatments, such as photodynamic therapy used to treat cancer. However, light transmits its energy in a peculiar manner, via particles known as photons. Different colors of light contain photons with different amounts of energy, and it is important that photon energies be matched to their intended applications. Photons with too little energy are unable to meet their intended task while photons with too much energy waste energy and can cause damage to components. This research project develops materials that reshape light’s energy content by combining pairs of photons into a single high-energy one or converting individual photons into multiple lower-energy photons. Once formed, these materials can serve as energy transfer agents improving solar energy harvesting and quantum computation. In addition to working with students closely on the research projects, Professor Roberts also founded and participates in the GReen Energy At Texas (GREAT) program, which was formed between the University of Texas at Austin and Austin Community College. GREAT aims to increase the number of community college student that earn degrees through targeted mentorship and research experiences.Semiconductor quantum dots chemically functionalized with organic dye molecules offer an ideal interface for photon conversion. Quantum dots energized by light absorption can pass their energy to molecules at their surface, promoting them into spin-triplet exciton states. If formed in high quantity, pairs of spin-triplet excitons can undergo triplet fusion, a process that combines their energy to form a single high-energy spin-singlet state that can radiate light. Likewise, photoexciting the dye molecules can fuel triplet fusion’s inverse process, singlet fission, which creates pairs of triplet excitons that can each pass to the quantum dot to drive infrared light emission. These schemes require a key step, the transfer of a spin-triplet exciton across the quantum dot:molecule interface, yet an understanding of how the structure of these interfaces impacts the rate and efficiency of spin-triplet exciton transfer is elusive. To address this need, Professor Roberts at the University of Texas at Austin directs a team that employs controlled chemical synthesis, 2D NMR and femtosecond time-resolved spectroscopies, and electronic structure calculations. The research team investigates how the chemical structure of quantum dot:molecule interfaces formed by two complementary quantum dot materials of PbS and Si impact spin-triplet exciton transfer. This project contributes to the creation of new hybrid organic:inorganic junctions for light-driven production of energy and fuels as well as materials that use spin entanglement for quantum computation and information storage.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.

化学部的大分子，超分子和纳米化学计划支持AS AS AS AS AS AS AS AS AS AS的Sean T. Roberts教授研究无线通信中材料中发生的光触发过程。但是，用于治疗癌症的光动力疗法。 ND任务虽然能量过多，并且对组件的拐杖损坏了。材料可以改善太阳能收获和量子计算，除了与学生一起研究研究项目外，罗伯茨教授还在德克萨斯州建立并参与了绿色能源社区学院的目标是赚取针对性的指导和研究经验。旋转三重奏激子可以进行三胞胎融合Ergy自旋单向状态，同样可以辐射光。方案需要一个关键的步骤，但对旋转式三核转移的速率和功效的理解是难以捉摸的。时间分辨的光谱和电子结构计算：由PBS的两个压缩材料和SI冲击自旋 - 怪物转移形成的分子界面。 NSF的法定，值得支持的支持Ion的知识分子和更广泛的影响标准。

项目成果

Research-Focused Approach for Introducing Undergraduate Students to Aromatic Organic Synthesis at a Community College

在社区学院向本科生介绍芳香族有机合成的以研究为中心的方法

• DOI: 10.1021/acs.jchemed.2c00662
• 发表时间: 2023
• 期刊: Journal of Chemical Education
• 影响因子: 3
• 作者: Boette, Jessica T.;Daniel, Kira M.;Lietzke, Josephine W.;Amorde, Shawn M.;Roberts, Sean T.
• 通讯作者: Roberts, Sean T.