Establishing the synthesis/structure relationship of molybdenum/lead chalcogenide quantum dot mesocrystals

建立钼/铅硫族化物量子点介晶的合成/结构关系

• 批准号: 2206122
• 负责人: Tobias Hanrath
• 金额: $ 18万
• 依托单位: Cornell 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: 2022-06-15 至 2024-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2206122&HistoricalAwards=false
• 关键词: Establishing; synthesis; structure; relationship; molybdenum

Non-technical summaryWith this project, supported by the Solid State and Materials Chemistry program in the Division of Materials Research, Professor Tobias Hanrath at Cornell University will explore the synthesis-structure relationships of a novel class of materials that combines nanoparticles with two-dimensional (2D) materials. By analogy to the rock-paper-scissors game, the investigators will use colloidal nanoparticles (i.e., rocks) to template the formation of molybdenum sulfide sheets (i.e., paper) on specific sections of the nanoparticle. Instead of scissors, the proposed synthesis approach leverages the well-defined nanoparticle shape (e.g., truncated cubes) to define the geometry of the particle-sheet composite. This project will have significant broader impact beyond the creation of new knowledge of scientific and societal importance, potentially leading to the development of new nanostructured composite materials with unique optical, electronic, and catalytic properties. Graduate students will receive extensive training and experience at the confluence of material fabrication and characterization approaches to investigate, understand and predict the formation of composite nanostructures. Outreach and education are closely integrated with the scientific work. The investigators will develop a ‘back-to-the-future’ workshop to engage participants by developing their vision for the future of their specific research field, the broader technological implications, and their personal roles and opportunities in bringing this future to fruition. Technical Summary The overarching objective of the proposed project, supported by the Solid State and Materials Chemistry program in the Division of Materials Research, is to establish the foundational synthesis/structure relationship of molybdenum/lead chalcogenide quantum dot mesocrystals. Mesocrystals are defined as assemblies of smaller constituent crystals arranged with high degree of translational and orientational ordering in their superlattice sites. Access to colloidal quantum dot (QD) building blocks with precisely defined size, shape, and composition as well as concurrent progress in understanding of and control over directed assembly and attachment have enabled remarkable advances in QD mesocrystals. Currently available QD mesocrystals are limited to single composition structures, yet the scientific and technological evolution of isolated QDs has taught us that moving from single-components to multi-composition heterostructures (e.g., core-shell or Janus-like) introduces advanced and programmable functionalities. The PI has identified the synthesis and analysis of heterostructured QD mesocrystals as a scientifically interesting and technologically important research challenge. The PI embraces the challenge of establishing processing/structure relationships as an opportunity to closely integrate synthesis, assembly, and materials characterization. The proposal presents a hypothesis-driven approach with three complementary objectives focused on formation of facet-specific PbX-(MoS2)m misfit layer heterostructures, and directed assembly of isolated PbX-(MoS2)m into a new class of superstructures. The proposed research presents an exciting opportunity to significantly improve upon the knowledge of QD mesocrystals with properties by design. The goals of the proposed research are ambitious, and the generated knowledge will significantly advance basic understanding, design, predictability and control over heterostructured QD mesocrystals with compelling far-reaching prospects for future advances in electrocatalysis and optoelectronicsThis 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.

非技术摘要通过这个项目，在材料研究部的固态和材料化学项目的支持下，康奈尔大学的托比亚斯·汉拉斯教授将探索一类新型材料的合成-结构关系，该材料将纳米颗粒与二维（类似于石头剪刀布游戏，研究人员将使用胶体纳米颗粒（即岩石）来模拟钼的形成。所提出的合成方法不是利用剪刀，而是利用明确的纳米颗粒形状（例如截断的立方体）来定义颗粒-片材复合材料的几何形状。除了创造具有科学和社会重要性的新知识之外，还具有更广泛的影响，有可能导致开发具有独特光学、电子和催化特性的新型纳米结构复合材料。研究生将接受广泛的培训和指导。研究人员将把研究、理解和预测复合纳米结构形成的材料制造和表征方法的经验与科学工作紧密结合起来。参与者通过发展他们对特定研究领域的未来的愿景、更广泛的技术影响以及他们在实现这一未来方面的个人角色和机会技术摘要拟议项目的总体目标得到了固态和材料化学的支持。计划中的部门材料研究，旨在建立钼/铅硫族化物量子点介晶的基本合成/结构关系介晶被定义为在其超晶格位点中以高度平移和定向有序排列的较小组成晶体的组件。 QD）具有精确定义的尺寸、形状和成分的构建块，以及在理解和控制定向组装和连接方面的同步进展，使得量子点介晶的显着进步目前可用的量子点介晶仅限于单一成分结构，但孤立量子点的科学和技术发展告诉我们，从单一成分转向多成分异质结构（例如核壳或Janus-like）。 ）介绍了先进的可编程功能，PI 已将异质结构 QD 介晶的合成和分析确定为一项具有科学意义和技术重要性的研究。该 PI 接受了建立加工/结构关系的挑战，将其作为紧密整合合成、组装和材料表征的机会。该提案提出了一种假设驱动的方法，其三个互补目标侧重于形成特定面的 PbX-(MoS2)。 )m 失配层异质结构，并将孤立的 PbX-(MoS2)m 定向组装成一类新型超结构。这项研究提供了一个令人兴奋的机会，可以通过以下方法显着提高对 QD 介晶的认识。拟议研究的目标雄心勃勃，所产生的知识将显着促进对异质结构 QD 介晶的基本理解、设计、可预测性和控制，对电催化和光电子学的未来发展具有令人信服的深远前景。该奖项反映了 NSF 的法定使命，并具有通过使用基金会的智力优点和更广泛的影响审查标准进行评估，被认为值得支持。