Deterministic sythesis and site specific functionalization of single walled carbon nanotubes and their application on the synthesis of functional materials

单壁碳纳米管的确定性合成和位点特异性功能化及其在功能材料合成中的应用

• 批准号: 341225-2007
• 负责人: Herrera, Jose
• 金额: $ 1.82万
• 依托单位: University of Western Ontario
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2007
• 资助国家: 加拿大
• 起止时间: 2007-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=364256
• 关键词: Deterministic; sythesis; site; specific; functionalization

Single-walled carbon nanotubes (SWNT) are an attractive material for a host of fundamental and applied studies, and their chemical functionalization has become an area of great interest for applications such as the fabrication of novel composite materials and chemical sensors. The mechanisms of functionalization are an active field of research and the current literature on this topic is abundant. However, current methodology lacks control over the attachment site of the chemical functionality and, therefore, specific chemical attachment schemes required for functional devices employing SWNT have not been achieved. Additional complexity of SWNT-based devices can only be achieved by modification of the valuable strategies already reported, such that SWNT can be functionalized in a site-specific manner along the SWNT length or tip. This in turn will limit reactions and interactions to either one of those regions only and not both. The proposed research will develop a novel approach to such site-specific functionalization that combines catalyst-assisted chemical vapor deposition (CVD) for synthesis of aligned SWNT forests over flat substrates, and the use of coating techniques to limit the functionalization of unprotected exposed regions of the aligned SWNT forests. The nanotube arrays will be directly functionalized after a protective layer has been deposited and etched along the array. Additionally, the CVD approach will allow tailoring of the nanotube diameters, and even chirality, by controlling the experimental parameters for synthesis such as feedstock composition, temperature, and catalyst composition. The final product obtained will be an extremely well designed SWNT material in which diameter, chirality, and site of the chemical functionality are well defined. In a fundamental sense, this approach will allow an enhancement of the current understanding of SWNT covalent functionalization, while in a practical sense, optimized derivatization procedures of a broad scope will be of value in the preparation of a wide range of SWNT hybrid materials. Funds requested will support 4MSC students and 3 PhD students to conduct an integrated design and experimental research program.

单壁碳纳米管（SWNT）是一种极具吸引力的基础和应用研究材料，其化学功能化已成为制造新型复合材料和化学传感器等应用领域的重要研究方向。功能化机制是一个活跃的研究领域，目前关于这一主题的文献非常丰富。然而，目前的方法缺乏对化学功能附着部位的控制，因此，采用SWNT的功能器件所需的特定化学附着方案尚未实现。基于SWNT的器件的额外复杂性只能通过修改已经报道的有价值的策略来实现，例如SWNT可以沿着SWNT长度或尖端以特定位点的方式功能化。这反过来又会限制反应和相互作用只局限于其中一个区域，而不是同时局限于这两个区域。提出的研究将开发一种新的方法来实现这种位点特异性功能化，该方法结合了催化剂辅助化学气相沉积（CVD）在平坦基底上合成排列的SWNT森林，并使用涂层技术来限制排列的SWNT森林未受保护的暴露区域的功能化。在沿阵列沉积和蚀刻一层保护层后，纳米管阵列将直接功能化。此外，CVD方法将允许通过控制合成的实验参数（如原料组成、温度和催化剂组成）来调整纳米管的直径，甚至手性。最终获得的产品将是一种设计良好的SWNT材料，其直径、手性和化学功能位点都得到了很好的定义。从基本意义上讲，这种方法将增强当前对SWNT共价功能化的理解，而在实际意义上，广泛范围的优化衍生化程序将在制备各种SWNT杂化材料中具有价值。申请的资金将支持4名硕士学生和3名博士学生进行综合设计和实验研究计划。