Phase Control in Rare Earth Chalcogenide Nanomaterials

稀土硫族化物纳米材料的相控制

• 批准号: 1904616
• 负责人: Sarah Stoll
• 金额: $ 46.48万
• 依托单位: Georgetown University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-09-01 至 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1904616&HistoricalAwards=false
• 关键词: Phase; Control; Rare; Earth; Chalcogenide

Prof. Sarah Stoll of Georgetown University conducts research to develop new methodologies for synthesizing nanoparticles containing rare earth elements. This is a relatively unexplored class of nanostructures with potentially useful electronic and magnetic properties. The fundamental knowledge to be gained from this research could inform future design of nanoparticle systems for applications in electronics, magnetics, and quantum computing. This project provides to undergraduate and graduate students training in chemical synthesis and the state-of-the-art techniques in characterization of magnetic nanoparticles. In addition to conducting outreach activities at D.C. public schools, Prof. Stoll develops new seminar series for the Georgetown University program called 'Science in the Public Interest' and engages Georgetown students in the organization called the 'National Science Policy Network'. These activities link groups of undergraduate and graduate students interested in science policy making and provide them opportunities to meet representatives from foundations, government and academics who are engaged in science policy.With the support from the Macromolecular, Supramolecular and Nanochemistry Program, the research group of Prof. Stoll develops new solution-phase synthetic methodologies for preparing lanthanide and uranium chalcogenide nanoparticles. This research aims to 1) provide mechanistic insights into the role of precursor reactivity in determining the composition, size, and structure of nanocrystals of these f-block elements; and 2) increase our fundamental understanding of the evolution of energy levels from molecular orbitals to the density of states diagram. Ferromagnetic uranium chalcogenides are of interest because of predicted high surface anisotropy, which should have a significant effect on the hysteresis curves as a function of particle size. In addition, the lanthanide and uranium chalcogenides exhibit strong magneto-optical properties. A suite of techniques (including high resolution transmission electron microscopy, atomic force microscopy, magnetic circular dichroism, X-ray absorption spectroscopy, SQUID magnetometry, solid-state thermolysis, and dynamic light scattering) is employed to characterize the nanoparticles and study their magnetic and electronic properties.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.

乔治敦大学的Sarah Stoll教授进行研究，开发合成含有稀土元素的纳米颗粒的新方法。 这是一种相对未开发的具有潜在有用的电子和磁性的纳米结构。 从这项研究中获得的基础知识可以为未来设计用于电子学，磁学和量子计算的纳米粒子系统提供信息。 该项目为本科生和研究生提供化学合成和磁性纳米颗粒表征的最新技术培训。 除了在哥伦比亚特区公立学校开展外展活动外，斯托尔教授还为乔治敦大学的“公共利益科学”项目开发了新的系列研讨会，并让乔治敦大学的学生参与了名为“国家科学政策网络”的组织。 这些活动将对科学政策制定感兴趣的本科生和研究生群体联系起来，并为他们提供机会与从事科学政策制定的基金会，政府和学术界代表会面。在大分子，超分子和纳米化学计划的支持下，Stoll教授的研究小组开发了制备镧系元素和铀硫属元素纳米颗粒的新液相合成方法。 这项研究的目的是：1）提供前体反应性在确定这些f区元素的纳米晶体的组成，尺寸和结构中的作用的机理见解; 2）增加我们对从分子轨道到态密度图的能级演化的基本理解。 铁磁铀硫属化物是感兴趣的，因为预测的高表面各向异性，这应该有一个显着的影响作为粒径的函数的磁滞曲线。此外，镧系元素和铀的硫属元素具有很强的磁光性质。 一套技术（包括高分辨率透射电子显微镜、原子力显微镜、磁性圆二色性、X射线吸收光谱、SQUID磁力测定法、固态热释电、和动态光散射）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。

项目成果

Single-Source Precursors for Lanthanide Diselenide Nanosheets

• DOI: 10.1021/acs.chemmater.9b03067
• 发表时间: 2019-09-24
• 期刊: CHEMISTRY OF MATERIALS
• 影响因子: 8.6
• 作者: Atif, Rida;Zarkov, Aleksej;Stoll, Sarah L.
• 通讯作者: Stoll, Sarah L.

Using Redox Titrations to Probe the Role of Trivalent Impurity Ions in the Ferromagnetism of Colloidal EuS Nanocrystals

使用氧化还原滴定法探讨三价杂质离子在胶体 EuS 纳米晶体铁磁性中的作用

• DOI: 10.1021/acs.chemmater.0c03020
• 发表时间: 2020
• 期刊: Chemistry of Materials
• 影响因子: 8.6
• 作者: De Siena, Michael C.;Rachkov, Alexander G.;Fainblat, Rachel;James, Derak;Creutz, Sidney E.;Stoll, Sarah L.;Gamelin, Daniel R.
• 通讯作者: Gamelin, Daniel R.

Mononuclear to Polynuclear U IV Structural Units: Effects of Reaction Conditions on U‐Furoate Phase Formation

单核到多核 U IV 结构单元：反应条件对 U-糠酸盐相形成的影响

• DOI: 10.1002/chem.201905759
• 发表时间: 2020
• 期刊: Chemistry – A European Journal
• 作者: Vanagas, Nicole A.;Higgins, Robert F.;Wacker, Jennifer N.;Asuigui, Dane Romar;Warzecha, Evan;Kozimor, Stosh A.;Stoll, Sarah L.;Schelter, Eric J.;Bertke, Jeffery A.;Knope, Karah E.
• 通讯作者: Knope, Karah E.

Giant band splittings in EuS and EuSe magnetic semiconductor nanocrystals

• DOI: 10.1039/d0cc00994f
• 发表时间: 2020-05-28
• 期刊: CHEMICAL COMMUNICATIONS
• 影响因子: 4.9
• 作者: Asuigui, Dane Romar C.;De Siena, Michael C.;Stoll, Sarah L.
• 通讯作者: Stoll, Sarah L.

Lanthanide Luminescence and Thermochromic Emission from Soft-Atom Donor Dichalcogenoimidodiphosphinate Ligands

软原子供体二硫族亚胺二膦酸盐配体的镧系元素发光和热致变色发射

• DOI: 10.1021/acs.inorgchem.2c02260
• 发表时间: 2022
• 期刊: Inorganic Chemistry
• 影响因子: 4.6
• 作者: Stewart, Orlando C.;Marwitz, Alexander C.;Swanson, Joel;Bertke, Jeffery A.;Hartman, Tyler;Monteiro, Jorge H.;de Bettencourt-Dias, Ana;Knope, Karah E.;Stoll, Sarah L.
• 通讯作者: Stoll, Sarah L.