Manipulation of Precursor Coordination and Reactivity to Enable Phase-tunability in Colloidally Synthesized Transition Metal Dichalcogenide Nanocrystals

操纵前体配位和反应性以实现胶体合成过渡金属二硫属化物纳米晶体的相可调性

• 批准号: 2003675
• 负责人: Alina Schimpf
• 金额: $ 40万
• 依托单位: University of California-San Diego
• 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=2003675&HistoricalAwards=false
• 关键词: Manipulation; Precursor; Coordination; Reactivity; Enable

With support from the Macromolecular, Supramolecular, and Nanochemistry (MSN) Program in the Division of Chemistry, Professor Alina Schimpf at University of California, San Diego is developing new strategies for the synthesis of transition metal dichalcogenides (TMDs). This class of materials has a wide array of potential applications including advanced electronics, chemical catalysis, and quantum information science. The properties of a TMD depend not only on their atomic composition, but also on the specific atomic arrangement (the crystal phase). To uncover their technological potential, the ability to generate phases of interest in pure form is critical. Unlike traditional solid-state syntheses, Professor Schimpf and her group use solution chemistry to directly synthesize TMDs of the same phase. The information garnered through targeted efforts on this type of TMDs is broadly applicable to and informs the synthesis of other TMDs and inorganic materials. Professor Schimpf is also using these studies as a platform to provide research experiences for community college students by partnering with San Diego Mesa College, an Hispanic Serving Institution. The educational outreach activity provides opportunities for students to work alongside PhD chemists and learn about advanced chemistry research. Transition metal dichalcogenides (TMDs) are poised to play an important role in emerging technologies, with potential uses in electronics, optoelectronics, catalysis and quantum spin information science. The various applications of these materials are derived from different crystal phases, giving rise to unique and diverse electronic and photophysical properties. Professor Schimpf’s research uses colloidal chemistry to access phase-tunable syntheses of group-VI TMDs with composition ME2 (M = Mo, W; E = S, Se) by exploiting the coordination chemistry and reactivity of the molecular precursors. This research explores the chemical principles that govern the ability to synthesize and maintain metastable phases. The primary objective is to develop a microscopic understanding of the chemistry that governs nanocrystal formation in order to rationally synthesize TMD nanocrystals with the desired properties. The insights gained from this research are being used to hone the design principles and iteratively add complexity to the structural design, enabling access to higher-quality and phase-pure inorganic materials. These studies may ultimately enable new strategies to access new or exotic phases of a wide range of TMDs. Professor Schimpf is also working with community college students from San Diego Mesa College, a local Hispanic Serving Institution, by engaging them in the research of designing and conducting syntheses of WS2 nanocrystals.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，加州大学圣地亚哥分校的Alina Schimpf教授正在开发合成过渡金属二硫属化物（TMD）的新策略。这类材料具有广泛的潜在应用，包括先进的电子学，化学催化和量子信息科学。TMD的性能不仅取决于其原子组成，还取决于特定的原子排列（晶相）。为了揭示它们的技术潜力，以纯粹的形式产生感兴趣的相的能力是至关重要的。与传统的固态合成不同，Schimpf教授和她的团队使用溶液化学直接合成相同相的TMD。通过对这种类型的TMD的有针对性的努力所获得的信息广泛适用于其他TMD和无机材料的合成，并为其他TMD和无机材料的合成提供信息。Schimpf教授还利用这些研究作为一个平台，通过与圣地亚哥梅萨学院，一个西班牙裔服务机构合作，为社区大学的学生提供研究经验。教育推广活动为学生提供了与博士化学家一起工作并了解先进化学研究的机会。过渡金属二硫属化合物（TMD）在电子学、光电子学、催化学和量子自旋信息学等新兴技术领域具有重要的应用前景。这些材料的各种应用源自不同的晶相，从而产生独特而多样的电子和电子物理特性。Schimpf教授的研究使用胶体化学，通过利用分子前体的配位化学和反应性，获得具有组成ME 2（M = Mo，W; E = S，Se）的VI族TMD的相位可调合成。这项研究探讨了控制合成和维持亚稳相能力的化学原理。主要目的是发展一个微观的理解，以合理地合成所需的性能TMD纳米晶体的化学，支配的nanocrystals形成。从这项研究中获得的见解被用于磨练设计原则，并迭代地增加结构设计的复杂性，从而能够获得更高质量和相纯的无机材料。这些研究可能最终使新的策略，以访问新的或异国情调的阶段，广泛的TMD。Schimpf教授还与当地西班牙裔服务机构圣地亚哥梅萨学院的社区大学学生合作，让他们参与WS 2纳米晶体的设计和合成研究。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。