Coherent Strategies to Achieve Luminescent Gold Clusters for Photonic Applications

实现光子应用发光金簇的相干策略

• 批准号: 2204039
• 负责人: Ramakrishna Guda
• 金额: $ 42.66万
• 依托单位: Western Michigan University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-08-01 至 2025-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2204039&HistoricalAwards=false
• 关键词: Coherent; Strategies; Achieve; Luminescent; Gold

With support from the Macromolecular, Supramolecular, and Nanochemistry (MSN) Program in the Division of Chemistry, Ramakrishna Guda of Western Michigan University is working to create highly luminescent gold nanoclusters for optical applications. In large pieces, gold is metallic and does not emit light. However, when it is broken down to tiny clusters with only a smaller number of atoms, such gold cluster will emit light. While these luminescent gold clusters are photostable and less toxic than many semiconductors, their luminescence is not as bright. Dr. Guda and his students will work to rationally design and synthesize gold clusters that luminescence with greater quantum efficiencies and over a broad range of colors. Their discoveries could lead to nanoclusters for light harvesting and optical sensing applications. The project will also provide research opportunities for graduate and undergraduate students, as well as introduce nanoscience to high school students and their teachers through education workshops. Atomically precise quantum-sized gold nanoclusters offer discrete electronic states, distinctive photoluminescence and exclusive excited-state relaxation that make them ideal candidates for various photonic applications. Achieving highly luminescent gold nanoclusters is challenging and is impeding their progress as photonic materials. The Guda research team will synthesize gold clusters with increased the rigidity of gold atoms at the cluster surface, with the goal of amplifying photoluminescence. The optical activity of gold clusters is expected to be further improved by judiciously functionalizing the surface with organic chromophores to achieve efficient energy transfer from a surface-bound chromophore to gold cluster or vice-versa. A combination of ultrafast time-resolved absorption and photoluminescence techniques will be used to unravel the mechanism of excited-state relaxation in these hybrid structures and provide feedback to design clusters with enhanced optical activity. The mechanistic studies are expected to shed light on intrinsic energy and charge transfer interactions between chromophores and atomically precise gold clusters.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.

在化学系中的大分子，超分子和纳米化学（MSN）计划的支持下，西密歇根大学的Ramakrishna Guda正在努力为光学应用创建高发光的金纳米群。在大块中，黄金是金属的，不会发光。但是，当它被分解为只有少量原子的微小簇时，这种金簇会发出光。尽管这些发光的金簇比许多半导体都具有光稳定和毒性较小，但它们的发光并不那么明亮。古达博士和他的学生将努力合理地设计和合成黄金簇，以提高量子效率并超过各种颜色。他们的发现可能会导致纳米簇进行轻收集和光学传感应用。该项目还将为研究生和本科生提供研究机会，并通过教育研讨会向高中生及其老师介绍纳米科学。原子上精确的量子尺寸的金纳米群落提供离散的电子状态，独特的光致发光和独特的激发状态放松，使其成为各种光子应用的理想候选者。实现高发光的金纳米群体具有挑战性，并阻碍了它们作为光子材料的进步。 GUDA研究团队将与金簇合成簇表面的金原子的刚度，以增强光致发光的目的。预计金簇的光活性将通过明智地通过有机色彩团体来实现表面来进一步改善，以实现从地面结合的发色团到金簇或反过来的有效能量转移。超快时间分辨的吸收和光致发光技术的结合将用于揭示这些杂种结构中激发态弛豫的机制，并为具有增强光学活性的设计簇提供反馈。预计该机械研究将阐明发色团和原子上精确的金簇之间的内在能量和电荷转移相互作用。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的智力优点评估和更广泛的影响来审查标准的。