Manufacturing of Two-Dimensional Metal-Organic Framework Nanosheets by Two-Phase Solution Method

该补助金支持在制造二维金属有机框架纳米片方面贡献新知识的研究，这是一类新的技术重要材料。二维材料由于其独特的性质而引起了人们的极大关注。二维金属有机骨架纳米片由于其原子级薄的层和具有高度可及的活性位点的大表面积而出现并受到关注。各种金属簇和有机配体的合理组合产生了所需的结构和功能特性，这使得二维金属-有机骨架纳米片在二维材料领域占据了相当独特的地位。然而，所有报道的合成都是在实验室规模上通过超声辅助方法进行的，导致低产物产率、低纯度和低纵横比。该奖项支持基础研究，为两阶段解决方案制造过程的开发提供所需的知识。新工艺能够大规模制造具有高纵横比和较少缺陷的二维金属有机框架。二维金属有机骨架纳米片具有许多潜在的应用，如分离和催化，这有利于化学和能源工业，从而有利于国家的经济和繁荣。这项研究涉及多个学科，包括化学，化学工程，材料科学和制造。多学科的方法有助于扩大妇女和代表性不足的群体和K-12学生在研究和积极影响科学，技术，工程和数学education.The两相溶液方法的研究提供了一个基本的理解扩散控制的方法，通过阐明的作用，去质子化剂，封端剂，和调制器的两相过程设计。它还通过研究加工动力学和对一系列新材料集的测试，提供了改进二维金属有机框架纳米片的可扩展纳米制造的一般原则。研究小组研究了影响金属有机框架纳米片生长方向和晶体尺寸的因素，并开发了一种控制这些纳米片层间力的方法。探索了一系列的封端剂，调节剂和去质子化剂来阐明它们的作用，同时使用不同的金属离子，阴离子和配体结构来制造这些独特的二维纳米片材料。这项研究的结果填补了许多不同材料组合的金属有机框架合成过程中纳米片形成机制的知识空白。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评估被认为值得支持影响审查标准。

This grant supports research that contributes new knowledge in the manufacturing of two-dimensional metal-organic framework nanosheets, which are a new class of technologically important materials. Two-dimensional materials have attracted significant attention due to their unique properties in comparison to their bulk counterparts. Two-dimensional metal-organic framework nanosheets have emerged and received interest due to their atomically-thin layers and large surface areas with highly accessible active sites. The judicious combination of varied metal clusters and organic ligands generate desired structural and functional properties, which make two-dimensional metal-organic framework nanosheets occupy a rather unique place in the field of two-dimensional materials. However, all reported synthesis is on a lab scale through sonication-assisted approaches causing low product yield, low purity, and low aspect ratio. This award supports fundamental research to provide needed knowledge for the development of a two-phase solution manufacturing process. The new process enables large scale manufacturing of two-dimensional metal-organic frameworks with high aspect ratios and fewer defects. Two-dimensional metal-organic framework nanosheets have many potential applications, such as separations and catalysis, which benefit the chemical and energy industries and, thus, the nation's economy and prosperity. This research involves several disciplines including chemistry, chemical engineering, materials science, and manufacturing. The multi-disciplinary approach helps broaden participation of women and underrepresented groups and K-12 students in research and positively impact Science, Technology, Engineering and Math education.The study of the two-phase solution method provides a fundamental understanding of diffusion-controlled approach to the bi-phase process design by elucidating the roles of deprotonating agent, capping agent, and modulator. It also provides a general principle to improve scalable nanomanufacturing of two-dimensional metal-organic framework nanosheets by studying the processing kinetics and testing on a series of new material sets. The research team studies factors affecting growth direction and crystal size of the metal-organic framework nanosheets and develops a method to control the interlayer forces in these nanosheets. A series of capping agents, modulators, and deprotonating agents are explored to elucidate their effects, while different metal ions, anions, and ligand structures are used to manufacture these unique two-dimensional nanosheet materials. Results from this research fills the knowledge gap on the mechanisms of nanosheets formation during metal-organic framework synthesis from many different material sets.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.