New Strategy for Synthesis of Atomically Precise Graphene Nanoribbons

合成原子级精确石墨烯纳米带的新策略

• 批准号: 2403736
• 负责人: Guangbin Dong
• 金额: $ 55.5万
• 依托单位: University of Chicago
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-05-01 至 2027-04-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2403736&HistoricalAwards=false
• 关键词: New; Strategy; Synthesis; Atomically; Precise; New; Strategy; Synthesis; Atomically; Precise

With the support of the Macromolecular, Supramolecular and Nanochemistry (MSN) program in the Division of Chemistry, Professor Guangbin Dong at the University of Chicago is developing efficient and scalable synthetic approaches for preparing atomically precise graphene nanoribbons (GNRs). These nanoribbons are exquisitely thin strips of graphene: a sheet of carbon atoms arranged in a rigid structure that resembles chicken wire. Graphene nanoribbons have emerged as attractive organic materials for potential applications in high speed, lightweight, flexible electronic, and spintronic devices. In this project, physical organic chemistry knowledge will be combined with advanced tools of transition metal catalysis to develop efficient strategies for making these interesting materials. If successful, the research will address a long-standing challenge of preparing narrow zig-zag graphene nanoribbons for studying their physical, electronical, optical, and magnetic properties. The research team will also be actively engaged in the Chicago Pre-College Science & Engineering Program (ChiS&E) to provide early chemistry education to Chicago public middle-school students, the Collegiate Scholars Program to teach high school students, and the Leadership Alliance Summer Research Early Identification Program (SR-EIP) to offer lab research experience to undergraduate students. Integration of the project with these outreach activities has the potential to greatly encourage diverse and students from underrepresented groups to explore careers in science and engineering while learning and actively contributing to research.The research project will focus on the development of efficient and scalable synthetic approaches towards atomically precise and narrow N=3-5 zigzag graphene nanoribbons (zGNRs). The preparation and fabrication in liquid phase of well-defined pristine zGNRs are very challenging and underdeveloped. To overcome these unmet challenges, stepwise cyclodehydrogenation approaches to access zGNRs from their more stable oxidized or reduced precursor ribbons will be devised. The novel monomer synthesis, on the other hand, will be explored using palladium/norbornene catalysis. Compared to the existing approaches for GNR synthesis, the merits of the new strategies have the potential to be quite significant: (i) monomers will be prepared in a streamlined manner from commercially available starting materials; (ii) the syntheses will be scalable by using in solution polymerization; (iii) air sensitive intermediates will be circumvented, easing the material transfer process; (iv) aryl−aryl cleavage defects are to be minimized by avoiding labile m-xylene-type units. The knowledge gained from this project has the potential to advance the understanding of these graphene-like quasi-one-dimensional polymers, which in turn will further stimulate the development of other new conjugated organic semiconducting materials.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.

在化学划分中的大分子，超分子和纳米化学（MSN）计划的支持下，芝加哥大学的广宾邦教授正在开发有效且可扩展的合成方法，用于制备原子上精确的石墨烯纳米骨（GNRS）。这些纳米容器完全是石墨烯的细条：一块碳原子，以类似于鸡丝的刚性结构排列。石墨烯纳米容器已成为高速，轻巧，柔性电子和自旋设备的潜在应用的有吸引力的有机材料。在这个项目中，物理有机化学知识将与高级过渡金属催化工具相结合，以制定制造这些有趣材料的有效策略。如果成功，这项研究将解决一项长期的挑战，即准备狭窄的锯齿石墨烯纳米容器来研究其物理，电子，光学和磁性。该研究团队还将积极参与芝加哥大学前科学与工程计划（CHIS＆E），以向芝加哥公立中学学生，大学学者课程提供早期的化学教育，以教授高中生，以及领导力联盟夏季研究早期研究早期身份识别计划（SR-EIP），以提供实验室研究经验，以提供实验室的研究经验。该项目与这些宣传活动的整合有可能最大程度地鼓励人物不足的团体的潜水员和学生在学习并积极地为研究中探索科学和工程学的职业。研究项目将着重于开发高效且可扩展的合成方法，以实现原子质和狭窄的n = 3-5 Zigzag nananoribbons（Zgnrr）（ZGNRR）。定义明确的原始ZGNR的液相制备和制造是非常挑战，并且不发达。为了克服这些未满足的挑战，将设计逐步的循环氢化方法，从其稳定的氧化物或还原的前体缎带中获取ZGNR。另一方面，新型的单体合成将使用钯/诺本烯催化剂进行探索。与现有的GNR合成方法相比，新策略的优点有可能非常重要：（i）单体将从市售的起始材料中精简的方式制备； （ii）合成将通过在溶液聚合中使用； （iii）空气敏感中间体将被绕开，简单的材料转移过程； （iv）避免不稳定的M二甲苯型单元，应最大程度地减少芳基芳基裂解缺陷。从该项目中获得的知识有可能提高对这些类似石墨烯的准二维聚合物的理解，这反过来将进一步刺激其他新的共轭有机半导体材料的发展。该奖项反映了NSF的法定任务，并通过使用该基金会的知识优点和广泛的范围来评估NSF的法定任务。