Structure-Property Relationships of Anion Vacancy Plasmonic Metal Oxide Nanocrystals

阴离子空位等离子体金属氧化物纳米晶的构效关系

• 批准号: 2319183
• 负责人: Rajesh Sardar
• 金额: $ 45.57万
• 依托单位: Indiana University
• 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: 2023-09-01 至 2026-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2319183&HistoricalAwards=false
• 关键词: Structure; Property; Relationships; Anion; Vacancy

NON-TECHNICAL SUMMARYScience and technology thrive on the discovery of new materials with unique optoelectronic properties. Nanosized materials commonly referred to as nanoparticles are in the forefront of modern scientific research because of their ever-expanding applications, specifically in energy storage and conversion for a sustainable future. With support from the Solid State and Materials Chemistry program in the Division of Materials Research, Prof. Rajesh Sardar and his group at Indiana University-Purdue University Indianapolis will expand the scientific understanding of metal oxide nanoparticle synthesis via colloidal synthetic methods. Because these nanoparticles contain oxygen coupled in a unique manner with non-toxic metals, the research allows for highly tunable and environmentally friendly nanoparticle compositions. The unique combination of shape anisotropy and surface chemistry of these nanoparticles will be optimized to enhance their optoelectronic properties directed towards highly advanced electronic devices and catalysts. The project aims to train underrepresented minority students through mentored research, and integration of research results into the university level graduate and undergraduate courses. The scientific and communication skills of students at every level will be enhanced through multi-faceted collaboration between scientists from universities and national laboratories, as well as mentoring and workshops. TECHNICAL SUMMARYThe discovery of new functional materials with unique optical and electronic properties will allow rational design of optoelectronic devices with better performance. This project supported by the Solid State and Materials Chemistry program in the NSF’s Division of Materials Research aims to synthesize localized surface plasmon resonance (LSPR)-active metal oxide nanoparticles where LSPR properties are generated from oxygen vacancies (anion deficiencies) in the stoichiometric inorganic lattice that leads to free (conduction band) electron density as high as in plasmonic noble metal (Au and Ag) nanoparticles. These anion deficient metal oxide nanoparticles are expected to produce strong electromagnetic field enhancement and hot electrons that are most desirable for various light-driven applications. This project seeks to understand the structure-property relationships of ligand-passivated nanoparticles. Specifically, the project (1) synthesizes LSPR-active, targeted anisotropic shaped nanoparticles via seed-mediated growth approaches, (2) performs spectroscopic and microscopic analyses, along with theoretical calculations to understand the mechanisms that control the shape and desired composition of such nanoparticles, and (3) utilizes organic passivating ligands to control and achieve substantially enhanced optoelectronic properties with unique abilities. As a part of the broader impact activities, graduate and undergraduate, along with underrepresented high school students will develop research skills through mentorship and workshops. Additionally, research outcomes will be integrated into undergraduate and graduate courses, as well as disseminated at national and international meeting, and peer-reviewed publications.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.

非技术摘要科学和技术的蓬勃发展取决于具有独特光电特性的新材料的发现。纳米材料通常被称为纳米颗粒，由于其应用不断扩大，特别是在可持续未来的能量存储和转换方面，处于现代科学研究的前沿。在材料研究部固态和材料化学项目的支持下，印第安纳大学-普渡大学印第安纳波利斯分校的 Rajesh Sardar 教授和他的团队将扩大对通过胶体合成方法合成金属氧化物纳米颗粒的科学理解。由于这些纳米颗粒含有以独特方式与无毒金属偶联的氧，因此该研究可实现高度可调且环境友好的纳米颗粒组合物。这些纳米粒子的形状各向异性和表面化学的独特组合将被优化，以增强其针对高度先进电子设备和催化剂的光电特性。该项目旨在通过指导研究以及将研究成果纳入大学研究生和本科生课程来培训代表性不足的少数族裔学生。通过大学和国家实验室科学家之间的多方面合作以及指导和研讨会，各个级别学生的科学和沟通技能将得到提高。技术概要具有独特光学和电子特性的新型功能材料的发现将有助于合理设计具有更好性能的光电器件。该项目由 NSF 材料研究部的固态和材料化学项目支持，旨在合成局域表面等离子体共振 (LSPR) 活性金属氧化物纳米颗粒，其中 LSPR 特性是由化学计量无机晶格中的氧空位（阴离子缺陷）产生的，从而导致自由（导带）电子密度与等离子体贵金属中一样高 金属（金和银）纳米颗粒。这些缺乏阴离子的金属氧化物纳米颗粒有望产生强电磁场增强和热电子，这对于各种光驱动应用来说是最理想的。该项目旨在了解配体钝化纳米颗粒的结构-性能关系。具体来说，该项目（1）通过种子介导的生长方法合成具有局域表面等离子体共振活性的、靶向各向异性形状的纳米颗粒，（2）进行光谱和显微分析以及理论计算，以了解控制此类纳米颗粒的形状和所需成分的机制，以及（3）利用有机钝化配体来控制和实现显着增强的 具有独特能力的光电特性。作为更广泛影响活动的一部分，研究生和本科生以及代表性不足的高中生将通过指导和研讨会培养研究技能。此外，研究成果将纳入本科生和研究生课程，并在国内和国际会议以及同行评审出版物上传播。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。