Polymers Comprising Concave and Chiral Subunits for the Selective Dispersion of Single Walled Carbon Nanotubes (SWCNT)

单壁碳纳米管具有优异的物理性能，是未来器件的理想材料。特别是，它们的电子和光学特性使它们在许多应用中具有很好的功能单元。虽然它们的结构(n，m指数)和物理性质之间的相关性是众所周知的，但它们在器件和材料中的集成受到了纯样品的低可用性和这些物质有限的加工性的影响。在这项提议中，我们致力于开发能够选择性地分散具有明确物理特征的单壁碳纳米管的聚合物结构，如电子性质、直径、n、m指数，甚至手性。为此，应开发与弯曲的单壁碳纳米管表面具有良好的PI堆积作用的凹形构建块，并将其整合到各种(共)聚合物中。这些构件将被合成为外消旋体，它们将被分离成纯的对映体(通过分离从两个对映体获得的非对映异构体)。因此，这种方法将使具有对映体纯度的(共)聚合物成为可能。这些(共)聚合物将被用来分散HIPCO-SWCNTs，并将通过UV-Vis-NIR吸收、近红外光致发光和拉曼光谱等光学方法分析分散体的组成(以及聚合物与SWCNT的相互作用)。我们还旨在开发一种能够通过聚合物对SWCNTs进行可逆包覆的工艺。虽然分散涂层提供了完全可加工的管子，但残留的绝缘涂层影响了管子与基材在整合时的相互作用。利用Diels-Alder反应的可逆性，我们设计了可热分解成小块的涂层聚合物。因此，我们希望提供具有可加工性的涂层，该涂层可在超高压应用中集成管材后去除。我们将相应地研究聚合物在单壁碳纳米管上的热分解，利用解吸质谱、拉曼显微镜和各种表面分析方法来探测所得到的材料。这也将为聚合物结构的优化提供反馈，以获得超高压清洁的手性载体，选择SWCNT材料进行进一步的研究。

Single wall carbon nanotubes are promising materials for future devices due to their outstanding physical properties. In particular their electronic and optical features make them promising functional units in numerous applications. While the correlation between their structure (n,m indices) and physical properties is well understood, their integration into devices and materials suffers from both the poor availability of pure samples and the limited processability of these substances. Within this proposal we strive to develop polymeric structures able to selectively disperse SWCNTs with well defined physical features like electronic properties, diameter, n,m-indices and even chirality. For that purpose concave building blocks with favorable Pi-stacking interactions with bent SWCNT surfaces shall be developed and integrated in various (co)-polymers. These building blocks will be synthesized as racemates which will be separated into pure enantiomers (by separating the diastereomers obtained from both enantiomers). The approach will thus make (co)-polymers of enantiomerically pure building blocks available. These (co)-polymers will be used to disperse HiPco-SWCNTs and the composition of the dispersion (as well as the polymer SWCNT interaction) will be analyzed by optical methods like UV-vis-nIR absorption , nIR photoluminescence-, and Raman spectroscopy.We also aim at developing a process enabling the reversible coating of SWCNTs by polymers. While the dispersing coating provides perfectly processable tubes, the residual insulating coating effects the interaction of the tube with the substrate upon integration. By profiting from the reversibility of Diels-Alder reactions we design coating polymers which can be thermally decomposed into small building blocks. Thereby we hope to provide coatings providing processability which can be removed after integration of the tube in UHV applications. We will correspondingly investigate the polymers thermal decomposition on the SWCNTs in situ, using both desorption mass spectrometry, Raman microscopy and a variety of surface analytical methods to probe the resulting materials. This will also provide feedback for the optimization of the polymer structure for the purpose of obtaining UHV clean chiral vector selected SWCNT materials for further studies.