Towards One-Dimensional Single-Molecule Topological Insulators

走向一维单分子拓扑绝缘体

• 批准号: 1807580
• 负责人: Latha Venkataraman
• 金额: $ 45万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-09-15 至 2022-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1807580&HistoricalAwards=false
• 关键词: Towards; Dimensional; Single; Molecule; Topological

Non-technical Abstract: Professors Latha Venkataraman and Luis Campos of Columbia University are aiming to create new molecular systems that can be wired into circuits to efficiently conduct electricity. Significant efforts have been made to develop molecules that can transport electrical charges at the nanometer scale, as these are important for electronic application, as well for photovoltaics and artificial photosynthesis. However, most molecules that function as conducting wires studied to date show a very rapid decrease in conductivity as their lengths are increased, limiting their applications. In this work, new families of molecular systems are designed and synthesized. The overarching goal is to create and determine the electronic properties of molecules, aiming to find systems where, for example, an increase in conductivity is observed as the molecular length is increased. This interdisciplinary work combines synthesis and measurements while also integrating research with a broad range of educational and outreach activities. The investigators train and mentor post-doctoral researchers, augment their undergraduate teaching to include results from their research, and expose K-12 school children to concepts from nanoscience and nanotechnology while also introducing them to a laboratory environment.Technical Abstract: In this project, Professors Latha Venkataraman and Luis Campos of Columbia University use concepts of physical organic chemistry to make single-molecule junctions with wires that model 1D topological insulators, to probe their unconventional transport properties. Families of molecular systems are designed and synthesized. These include (1) wires that have radicals near the ends; (2) molecular backbones with redox active units that enable the creation and control of radical states; and (3) molecular wires with resonance structures that ensure small bond-length alternation. Scanning probe techniques are applied to measure their single-molecule conductance and to characterize transport properties as a function of molecular length. The ultimate goal of this proposed work is the development and proof of concept demonstration of systems with high conductivities and transport properties that go beyond those observed in standard conjugated molecules. The educational and outreach efforts of this proposal have three broad objectives. The PIs provide an undergraduate research experience in a multidisciplinary environment, influencing the graduate admissions through service programs, integrate their research into the Applied Physics and Chemistry undergraduate curriculum and finally, make a focused effort to bring in K-12 school children in a laboratory environment to introduce them to basic concepts in chemistry and nanoscience.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.

非技术摘要：哥伦比亚大学的Latha Venkataraman和Luis Campos教授致力于创造新的分子系统，这些系统可以连接到电路中以有效地导电。人们已经做出了巨大的努力来开发可以在纳米尺度上传输电荷的分子，因为这些对于电子应用以及光化学和人工光合作用都很重要。然而，迄今为止研究的大多数用作导线的分子显示出随着其长度的增加，电导率非常迅速地下降，限制了它们的应用。在这项工作中，新的家庭的分子系统的设计和合成。首要目标是创建和确定分子的电子性质，旨在找到系统，例如，随着分子长度的增加，观察到电导率的增加。这项跨学科的工作结合了综合和测量，同时还将研究与广泛的教育和推广活动相结合。研究人员培训和指导博士后研究人员，增加他们的本科教学，包括他们的研究成果，并使K-12学童接触纳米科学和纳米技术的概念，同时也将他们引入实验室环境。技术摘要：在这个项目中，哥伦比亚大学的Latha Venkataraman和Luis Campos教授利用物理有机化学的概念，分子结的电线模型一维拓扑绝缘体，以探测其非常规的传输特性。设计和合成分子系统的家族。这些包括（1）末端附近具有自由基的线;（2）具有氧化还原活性单元的分子骨架，能够产生和控制自由基状态;（3）具有共振结构的分子线，可确保小的键长变化。扫描探针技术被用来测量它们的单分子电导和表征作为分子长度的函数的传输特性。这项工作的最终目标是开发和验证具有高电导率和传输特性的系统的概念演示，这些特性超出了在标准共轭分子中观察到的特性。这项建议的教育和外联工作有三大目标。PI在多学科环境中提供本科研究经验，通过服务计划影响研究生入学，将他们的研究融入应用物理和化学本科课程，最后，集中精力把K-12名学生在实验室环境中向他们介绍化学和纳米科学的基本概念。该奖项反映了NSF的法定使命，并已被视为通过使用基金会的知识价值和更广泛的影响审查标准进行评估，

项目成果

In Situ Coupling of Single Molecules Driven by Gold‐Catalyzed Electrooxidation

金催化电氧化驱动的单分子原位偶联

• DOI: 10.1002/ange.201906215
• 发表时间: 2019
• 期刊: Angewandte Chemie
• 作者: Zang, Yaping;Stone, Ilana;Inkpen, Michael S.;Ng, Fay;Lambert, Tristan H.;Nuckolls, Colin;Steigerwald, Michael L.;Roy, Xavier;Venkataraman, Latha
• 通讯作者: Venkataraman, Latha

Highly conducting single-molecule topological insulators based on mono- and di-radical cations

• DOI: 10.1038/s41557-022-00978-1
• 发表时间: 2022-07-07
• 期刊: NATURE CHEMISTRY
• 影响因子: 21.8
• 作者: Li, Liang;Low, Jonathan Z.;Venkataraman, Latha
• 通讯作者: Venkataraman, Latha

Solitonics with Polyacetylenes

• DOI: 10.1021/acs.nanolett.0c00136
• 发表时间: 2020-04-08
• 期刊: NANO LETTERS
• 影响因子: 10.8
• 作者: Hernangomez-Perez, Daniel;Gunasekaran, Suman;Evers, Ferdinand
• 通讯作者: Evers, Ferdinand

Breaking Down Resonance: Nonlinear Transport and the Breakdown of Coherent Tunneling Models in Single Molecule Junctions

打破共振：非线性输运和单分子结中相干隧道模型的打破

• DOI: 10.1021/acs.nanolett.9b00316
• 发表时间: 2019-04-01
• 期刊: NANO LETTERS
• 影响因子: 10.8
• 作者: Fung, E-Dean;Gelbwaser, David;Venkataraman, Latha
• 通讯作者: Venkataraman, Latha

Unsupervised feature recognition in single-molecule break junction data

• DOI: 10.1039/d0nr00467g
• 发表时间: 2020-04-21
• 期刊: NANOSCALE
• 影响因子: 6.7
• 作者: Magyarkuti, Andras;Balogh, Nora;Halbritter, Andras
• 通讯作者: Halbritter, Andras