EAGER: Synthesis of One-Dimensional Carbon Chains by Selective Bond Breaking in Polymers

EAGER：通过聚合物中选择性断键合成一维碳链

• 批准号: 0944479
• 负责人: Yongfeng Lu
• 金额: $ 10万
• 依托单位: University of Nebraska-Lincoln
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-08-15 至 2010-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0944479&HistoricalAwards=false
• 关键词: EAGER; Synthesis; Dimensional; Carbon; Chains

0944479LuGoal & Objectives: Historically, carbon allotropes of different dimensional structures (e.g., 3-D diamonds, 2-D graphite and carbon nanotubes - rolled graphitic sheets, and 0-D fullerenes) have been copiously studied. However, 1-D carbon chains (carbyne) have long been an unfrequented zone in scientific community due to the absence of sufficient sizeable and well-defined carbyne crystal samples. The primary goal of this project is to produce carbyne from a polymeric precursor 'polythiophene' through laser-assisted synthesis process. This research has the potential to not only enrich scientific knowledge of the carbon family tree by enabling for the first time a detailed characterization of the crystal and electronic structures of carbyne, but also allow for the potential new technological approaches to the all-carbon electronics. The goal of this project will be accomplished through five objectives: 1) to develop a synthesis method to obtain carbyne from polythiophene using laser-induced selective bond-breaking; 2) to produce well-defined and sizeable crystalline carbyne in scalable quantities; 3) to improve stability of carbyne crystals, 4) to clarify crystal and electronic structures of crystalline carbyne; and 5) to understand the fundamental physical properties of carbyne. The PI has shown that carbon-chain nanocrystals could be prepared by breaking the C-S and C-H bonds in polythiophene. Atomic force microscopy and X-ray diffraction measurements suggested that the formation of cubic carbon nanocrystals with a quasi-1-D carbon-chain structure is possible. Based on these preliminary results, the PI will selectively break the C-S bonds in polythiophene using resonant laser excitation, which is anticipated to produce sizeable carbyne crystals with well-defined structures in scalable quantities. Furthermore, the PI will carry out structural characterization of the carbyne crystals and investigate the electronic properties using scanning tunneling microscopy. Fundamental physical properties of the carbyne crystals will be investigated correspondingly to evaluate the possibility of potential applications in all-carbon electronics. Intellectual Merit: This research will establish a state-of-the-art approach to preparing sizeable well-defined carbyne crystals with scalable quantities. Successful implementation could advance all-carbon electronics. Compared to currently used processes, the process to be developed has these advantages: 1) the proposed method is environmentally friendly by eliminating hazardous solutions; 2) by obtaining well-defined carbyne crystals, the crystalline structure of carbyne will be well characterized; 3) the process is cost-effective because it requires only a single step, meeting manufacturing needs of carbyne crystals. Because the PI has successfully undertaken previous research on laser interactions with polymers, the process and characterization equipment recently developed will be used in this project Broader Impacts: This project will benefit social and educational communities. The mass-production of crystalline carbyne would provide a knowledge base and practical approaches for a wide range of engineering applications, such as the all-carbon electronics, light harvesting antenna, and antioxidant and anticorrosive material. The research results will be released to scientific, industrial, and public communities in various ways, including the internet, journal papers, and conferences. This new knowledge will be incorporated into courses at the University of Nebraska-Lincoln (i.e., 'ELEC 952: Introduction to Nanotechnology'). One graduate student from an underrepresented minority group and two undergraduate students will work on this project.

0944479 lugoal＆目标：从历史上看，已经大量研究了不同尺寸结构（例如3-D钻石，2-D石墨和碳纳米管的碳同素）。然而，由于没有足够大的Carbyne晶体样品，一杆碳链（Carbyne）长期以来一直是科学界的一个不频繁的区域。该项目的主要目标是通过激光辅助合成过程从聚合物前体“聚噻吩”中产生Carbyne。这项研究不仅可以通过首次启用Carbyne的晶体和电子结构的详细表征来丰富对碳家族树的科学知识，而且还允许为全碳电子产品采用潜在的新技术方法。该项目的目标将通过五个目标来实现：1）开发一种合成方法，使用激光诱导的选择性键断裂从聚噻吩中获得Carbyne； 2）以可扩展的数量生产明确且较大的结晶性Carbyne； 3）为了提高Carbyne晶体的稳定性，4）澄清晶体Carbyne的晶体和电子结构； 5）了解Carbyne的基本物理特性。 PI表明，可以通过打破聚噻吩中的C-S和C-H键来制备碳链纳米晶体。原子力显微镜和X射线衍射测量表明，具有准碳纳米晶体具有准1-D碳链结构。基于这些初步结果，PI将使用谐振激光激发选择性地打破聚噻吩中的C-S键，这预计会产生具有可扩展量的明确结构的相当大的Carbyne晶体。此外，PI将进行Carbyne晶体的结构表征，并使用扫描隧道显微镜研究电子性质。将对Carbyne晶体的基本物理特性进行相应研究，以评估全碳电子中潜在应用的可能性。知识分子的优点：这项研究将建立一种最新的方法，用于准备具有可扩展数量的大量定义的Carbyne晶体。成功实施可以推动全碳电子产品。与当前使用的过程相比，要开发的过程具有以下优势：1）提出的方法通过消除危险解决方案而对环境友好； 2）通过获得定义明确的Carbyne晶体，Carbyne的晶体结构将得到充分的特征； 3）该过程具有成本效益，因为它仅需要一个步骤，满足Carbyne Crystals的制造需求。由于PI已成功地进行了有关激光与聚合物相互作用的研究，因此最近开发的过程和表征设备将在该项目中使用更广泛的影响：该项目将使社会和教育社区受益。 Crystalline Carbyne的批量生产将为广泛的工程应用提供知识库和实用方法，例如全碳电子，轻型收获天线以及抗氧化剂和反腐败材料。该研究结果将以各种方式发布给科学，工业和公共社区，包括互联网，期刊论文和会议。这些新知识将纳入内布拉斯加州林肯大学的课程（即“ ELEC 952：纳米技术概论”）。一名来自代表性不足的少数群体和两名本科生的研究生将从事该项目。