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.

非技术摘要与该项目的支持，在材料研究部的固态和材料化学计划的支持下，康奈尔大学的Tobias Hanrath教授将探索将纳米颗粒与二维（2D）材料相结合的新型材料的合成关系。通过类似于岩纸剪辑器游戏，研究人员将使用胶体纳米颗粒（即岩石）模板在纳米粒子的特定部分上模板形成硫化钼片（即纸）。所提出的合成方法代替剪刀，利用明确定义的纳米颗粒形状（例如，截短的立方体）来定义粒子表复合材料的几何形状。该项目将在创造科学和社会重要性的新知识之外产生更广泛的影响，这有可能导致具有独特的光学，电子和催化特性的新纳米结构复合材料的开发。研究生将在材料制造和表征方法的融合中获得广泛的培训和经验，以调查，理解和预测复合纳米结构的形成。外展和教育与科学工作紧密融合。调查人员将开展一个“倒台”研讨会，以通过对其特定研究领域的未来，更广泛的技术影响以及他们的个人角色和机会来使这一未来流通，以吸引参与者。技术摘要在材料研究部中的固态和材料化学计划的支持下，提出的项目的总体目标是建立钼/甲虫硫化丙酯量子点中晶的基础综合/结构关系。中晶被定义为在其超晶格位置上以高度的转化和定向排序排列的较小组成晶体的组件。访问具有精确定义的尺寸，形状和组成以及对有向组件和附件的理解和控制方面的胶体量子点（QD）构建块在QD中晶体中已取得了显着进步。目前可用的QD中晶仅限于单一组成结构，但是孤立QD的科学和技术演变告诉我们，从单组分转变为多组成异质结构（例如核心壳或类似Janus）引入了高级和可编程功能。 PI确定了异质结构QD中晶的合成和分析是一项科学有趣且技术上重要的研究挑战。 PI拥护建立处理/结构关系的挑战，以此作为紧密整合综合，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，三个完整的目标集中在形成方面特异性的PBX-（MOS2）M型MISSFIT层异质结构，并将孤立的PBX-（MOS2）M的定向组装成新的Superstructure类。拟议的研究提供了一个令人兴奋的机会，可以显着提高具有设计属性的QD中晶的知识。拟议的研究的目标是雄心勃勃的，生成的知识将大大提高基本的理解，设计，可预测性和对异质化QD QD中晶体的控制，并具有引人注目的深远的触觉前景，以实现未来的电催化和光电促进性的进展和光电奖，这对NSF的法定任务进行了评估，并通过评估商标来表现出伟大的支持。