Nanocrystal Conversion Pathways for the Synthesis of Multimetallic Nanostructures

用于合成多金属纳米结构的纳米晶体转化途径

• 批准号: 2203349
• 负责人: Sara Skrabalak
• 金额: $ 46.5万
• 依托单位: Indiana University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-09-15 至 2025-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2203349&HistoricalAwards=false
• 关键词: Nanocrystal; Conversion; Pathways; Synthesis; Multimetallic

With the support of the Macromolecular, Supramolecular and Nanochemistry (MSN) Program in the Division of Chemistry, Professor Sara Skrabalak at Indiana University – Bloomington will develop new ways of making multimetallic materials with nanoscale dimensions. Metal particles with nanoscale dimensions have fascinating properties that differ from bulk materials. For example, bulk gold appears as a lustrous yellow color while nanoscale gold can appear many different colors depending on particle size and shape, having given rise to the brilliant colors of stained glass. The nanoscale properties of metal particles are now being leveraged in technologies that promote sustainability, security, health, and more. However, general syntheses for nanoscale particles composed of two or more metals are far less developed. The Skrabalak group aims to develop predictable and generalizable syntheses for multimetallic nanoparticles with defined structural and compositional features. This project will provide robust training for graduate students in an inclusive environment. In addition, this research will be coupled with broad educational and outreach initiatives that promote understanding of nanoscale materials, including exploration of the importance of scale through the “Powers of Ten” concept with local artists and non-scientists. Professor Skrabalak and her students will work with the Art Commission of Bloomington, Indiana to identify a site and artist for the creation of a public mural that explores size and scale and their importance to public life. Activities for the public’s exploration of this topic will be developed for use during the mural’s debut and subsequent outreach events.The synthesis of multimetallic nanoparticles will start with known nanoparticles, which will then be converted into more complex nanoparticles by physical and chemical methods. The nanoparticle conversion pathways will focus on two nanoparticle classes. First, high entropy alloy metal nanoparticles – multi-element, single-phase materials consisting of five or more elements in similar atomic ratios – will be synthesized by heating core@shell nanoparticles to facilitate interdiffusion. The mechanism that accounts for their formation will be determined by monitoring changes in crystal phase and elemental distribution. New compositions also will be targeted. Second, nanoparticle heterostructures with different metal domains will be synthesized by galvanic replacement between multimetallic nanoparticles and metal precursors. The mechanism that accounts for the formation of different nanoparticle heterostructures will be elucidated to achieve particles with integrated atomic and nanoscale architectures. The compositional and structural properties of these complex nanoparticles will also be studied.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.

在化学系大分子、超分子和纳米化学（MSN）项目的支持下，印第安纳州大学布卢明顿分校的Sara Skrabalak教授将开发制造纳米尺度多金属材料的新方法。具有纳米尺度的金属颗粒具有不同于块状材料的迷人特性。例如，大块黄金呈现出明亮的黄色，而纳米级黄金可以根据颗粒大小和形状呈现出许多不同的颜色，从而产生了彩色玻璃的绚丽色彩。金属颗粒的纳米级特性现在被用于促进可持续性，安全性，健康等的技术中。然而，由两种或更多种金属组成的纳米颗粒的一般合成远没有那么发达。Skrabalak小组的目标是开发具有明确结构和组成特征的多金属纳米颗粒的可预测和可推广的合成。该项目将在包容性环境中为研究生提供强有力的培训。此外，这项研究将与广泛的教育和宣传活动相结合，促进对纳米材料的理解，包括通过与当地艺术家和非科学家的“十的力量”概念探索规模的重要性。教授Skrabalak和她的学生将与布卢明顿，印第安纳州的艺术委员会合作，以确定一个网站和艺术家的公共壁画，探索大小和规模及其对公共生活的重要性创建。在壁画的首次亮相和随后的推广活动中，将开展公众对这一主题的探索活动。多金属纳米颗粒的合成将从已知的纳米颗粒开始，然后通过物理和化学方法将其转化为更复杂的纳米颗粒。纳米粒子转化途径将集中在两个纳米粒子类。首先，高熵合金金属纳米颗粒-由五种或更多种元素以相似的原子比组成的多元素单相材料-将通过加热核@壳纳米颗粒以促进相互扩散来合成。解释其形成的机制将通过监测晶相和元素分布的变化来确定。新的作品也将成为目标。第二，通过多金属纳米颗粒和金属前体之间的电置换，将合成具有不同金属域的纳米颗粒异质结构。将阐明不同纳米颗粒异质结构形成的机制，以获得具有集成原子和纳米级架构的颗粒。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Reaction stoichiometry directs the architecture of trimetallic nanostructures produced via galvanic replacement

反应化学计量指导通过电取代产生的三金属纳米结构的结构

• DOI: 10.1039/d2nr06632g
• 发表时间: 2023
• 期刊: Nanoscale
• 影响因子: 6.7
• 作者: Kar, Nabojit;McCoy, Maximilian;Zhan, Xun;Wolfe, Joshua;Wang, Zhiyu;Skrabalak, Sara E.
• 通讯作者: Skrabalak, Sara E.