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Rational chemical strategies for carbon nanotube functionalization

机译：碳纳米管功能化的合理化学策略

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Whereas the chemistry of fullerenes is well-established, the chemistry of single-walled carbon nanotubes (SWNTs) is a relatively unexplored field of research. Investigations into the bonding of moieties onto SWNTs are important because they provide fundamental structuralinsight into how nanoscale interactions occur. Hence, understanding SWNT chemistry becomes critical to rational, predictive manipulation of their properties. Among the strategies discussed include molecular metal complexation with SWNTs to control site-selective chemistry in these systems. In particular, work has been performed with Vaska's and Wilkinson's complexes to create functionalized adducts. Functionalization should offer a relatively simple means of tube solubilization and bundle exfoliation, and also allows for tubes to be utilized as recoverable catalyst supports. Solubilization of oxidized SWNTs has also been achieved through derivatization by using a functionalized organic crown ether. The resultant adduct yielded concentrations of dissolved nanotubes on the order of 1 g L~(-1) in water and at elevated concentrations in a range of organic solvents, traditionally poor for SWNT manipulation. To further demonstrate chemical processability of SWNTs, we have subjected them to ozonolysis, followed by treatment with various independent reagents, to rationally generate a higher protoriton of oxygenated functional groups on the nanotube surface. This protocol has been found to purify nanotubes. More importantly, the reaction sequence has been found to ozonize the sidewalls of these nanotubes. Finally, SWNTs have also been chemically modified with quantum dots and oxide nanocrystals. A composite heterostructure consisting of nanotubes joined to nanocrystals offers a unique opportunity to obtain desired physical, electronic, and chemical properties by adjusting synthetic conditions to tailor the size and structure of the individual sub-components, with implications for self-assembly.
机译：尽管富勒烯的化学作用已经确立，但是单壁碳纳米管（SWNTs）的化学作用是一个相对未开发的研究领域。研究部分与单壁碳纳米管的键合非常重要，因为它们为了解纳米级相互作用的发生提供了基本的结构见解。因此，了解SWNT化学性质对于合理预测其性质至关重要。讨论的策略包括与SWNT分子金属络合，以控制这些系统中的位点选择性化学反应。特别是，已经使用Vaska和Wilkinson的配合物进行了工作，以生成功能化的加合物。功能化应该提供管溶解和束剥落的相对简单的方法，并且还允许将管用作可回收的催化剂载体。氧化的SWNT的增溶也已经通过使用官能化的有机冠醚的衍生作用来实现。所得的加合物在水中的溶解纳米管的浓度约为1 g L〜（-1），在一系列有机溶剂中浓度较高，这在传统上对SWNT的处理较差。为了进一步证明单壁碳纳米管的化学可加工性，我们将其进行了臭氧分解，然后用各种独立的试剂进行处理，以在纳米管表面上合理地产生更高含量的氧化官能团。已经发现该方案可以纯化纳米管。更重要的是，已经发现反应序列使这些纳米管的侧壁臭氧化。最后，SWNT也已经用量子点和氧化物纳米晶体进行了化学修饰。由纳米管连接到纳米晶体组成的复合异质结构提供了独特的机会，可以通过调整合成条件以调整各个子组件的尺寸和结构来获得所需的物理，电子和化学性质，这对自组装具有重要意义。

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