Tuning Carbon Nanotube Band Gaps by Guanine Functionalization

通过鸟嘌呤功能化调节碳纳米管带隙

• 批准号: 2203309
• 负责人: Robert Weisman
• 金额: $ 49.5万
• 依托单位: William Marsh Rice 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: 2022-08-01 至 2025-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2203309&HistoricalAwards=false
• 关键词: Tuning; Carbon; Nanotube; Band; Gaps

Professor Robert B. Weisman of William Marsh Rice University is supported by the Macromolecular, Supramolecular and Nanochemistry Program of the Division of Chemistry to investigate and control the properties of single-wall carbon nanotubes linked to DNA. These nanotubes are a prominent family of artificial nanomaterials whose unusual properties and potential uses can lead to new scientific discoveries and useful real-world applications in the areas of health care, energy, and infrastructure safety. This project is based on the discovery by Weisman and co-workers of a reaction that bonds DNA to nanotubes to form stable hybrid structures that have controllable optical and electronic properties. The investigators will use experiments and computations to further explore the nature of these nanotube-DNA hybrids and to examine their potential for use in biomedical sensing and quantum information processing. Apart from these research goals, the project will advance science education at several levels. Graduate students working on the project will gain essential hands-on training and will develop skills in oral and written technical communication. Undergraduate students participating in the studies will get valuable research experience. The Weisman lab will also host high school teachers during the summers in an ongoing program that expands their knowledge and leads to enriched science curricula affecting hundreds of high school students. This project will deepen our understanding of the unique covalent reaction between guanine nucleobases and carbon nanotubes induced by singlet O2. This reaction perturbs the nanotube electronic structure by introducing a dense array of shallow excitonic traps whose spacing and depth can be controlled by the choice of ssDNA oligo structure. It thus has the potential to produce nanotube hybrids with engineered band gaps. Experiments supported by molecular dynamics and quantum chemical computations will investigate 1) how interactions between sensitizer and nanotube affect the covalent reaction; 2) the chemical bonding between DNA and nanotube; 3) the source of spectral broadening in the hybrids; 4) the parameters controlling functionalization extent. The results will clarify the detailed structures of the hybrids and the mechanism of the functionalization reaction. Optimal conditions for efficient formation of the desired products will also be identified. Customized DNA-functionalized nanotube samples will be prepared for targeted collaborative projects to further probe their properties and explore possible applications in quantum optics and biomedical sensing.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.

威廉·马什·赖斯大学的罗伯特·B·魏斯曼教授得到了化学系大分子、超分子和纳米化学计划的支持，负责研究和控制连接到DNA上的单壁碳纳米管的性质。这些纳米管是人工纳米材料的一个重要家族，其不同寻常的性质和潜在的用途可以在医疗保健、能源和基础设施安全领域带来新的科学发现和有用的现实应用。这个项目是基于Weisman和他的同事发现的一种反应，这种反应将DNA与纳米管结合起来，形成具有可控光学和电子性质的稳定的杂化结构。研究人员将利用实验和计算进一步探索这些纳米管-DNA杂交物的性质，并检查它们在生物医学传感和量子信息处理中的潜力。除了这些研究目标外，该项目还将在几个层面上推进科学教育。参与该项目的研究生将获得基本的动手培训，并将发展口头和书面技术交流的技能。参与研究的本科生将获得宝贵的研究经验。魏斯曼实验室还将在夏季接待高中教师，这是一个正在进行的项目，该项目扩大了他们的知识，并导致影响到数百名高中生的丰富的科学课程。这个项目将加深我们对单线态氧诱导的鸟嘌呤核苷酸碱基与碳纳米管之间独特的共价反应的理解。这种反应通过引入密集的浅激子陷阱阵列来扰乱纳米管的电子结构，这些浅激子陷阱的间距和深度可以通过选择单链DNA寡聚结构来控制。因此，它有可能制造出具有工程带隙的纳米管杂化材料。分子动力学和量子化学计算支持的实验将研究1)敏化剂和纳米管之间的相互作用如何影响共价反应；2)DNA和纳米管之间的化学键；3)杂化材料中光谱展宽的来源；4)控制功能化程度的参数。结果将阐明杂化产物的详细结构和官能化反应的机理。还将确定有效形成所需产品的最佳条件。将为有针对性的合作项目准备定制的DNA功能化纳米管样本，以进一步探索它们的性质，并探索其在量子光学和生物医学传感方面的可能应用。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Robert F. Curl, Jr.: Physical Chemist and Codiscoverer of Fullerenes

• DOI: 10.1073/pnas.2219056119
• 发表时间: 2022-12-09
• 期刊: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• 影响因子: 11.1
• 作者: Brooks, Philip R.;Weisman, R. Bruce;Johnson, Bruce R.
• 通讯作者: Johnson, Bruce R.

Compositional Analysis of ssDNA-Coated Single-Wall Carbon Nanotubes through UV Absorption Spectroscopy

• DOI: 10.1021/acs.nanolett.2c02850
• 发表时间: 2022-10-26
• 期刊: NANO LETTERS
• 影响因子: 10.8
• 作者: Alizadehmojarad, Ali A.;Bachilo, Sergei M.;Weisman, R. Bruce
• 通讯作者: Weisman, R. Bruce