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Complex nano-assemblies of polymers and carbon nanotubes

机译：聚合物和碳纳米管的复杂纳米组件

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摘要

Since the discovery of carbon nanotubes in 1991 (1), researchers have envisaged potential applications such as nanoscale electronic circuits and the construction of complex carbon-based nano-machines. Thus, the assembly of basic building blocks of complex nano-architectures, such as conjugated polymers and nanotubes, has been a driving goal of much of the nano-science community. A first step towards realizing this goal may be the attachment to, or modification by carbon nanotubes of structures such as polymers. This leads to the possibility of assembling individual polymer molecules onto carbon nanotubes with the net effect being the modification of the polymer's electronic properties and structure in a predictable way. To accomplish this, clearly, a more detailed understanding of the interactions between conjugated polymers and carbon nanotubes must be sought. In this paper, we describe the assembly of the polymer, poly(m-phenylenevinylene-co-2,5-dioctoxy-p-phenylenevinylene) (PmPV), into a coating around single-walled carbon nanotubes. Using scanning tunnelling microscopy, and scanning tunnelling spectroscopy, we demonstrate that the low-energy electronic structure of the assembled material is dominated by the one-dimensional nature of the nanotube as reflected in van Hove singularities. Further, we examine the modifications to electronic structure at higher energies using spectroscopy, which suggests that the polymer's electronic structure is altered by the introduction of nanotubes.
机译：自从1991年发现碳纳米管以来（1），研究人员已经设想了潜在的应用，例如纳米级电子电路和复杂的碳基纳米机械的构造。因此，组装复杂的纳米结构的基本构件，例如共轭聚合物和纳米管，已成为许多纳米科学界的驱动目标。实现该目标的第一步可能是将碳纳米管附着或修饰在结构（例如聚合物）上。这导致将单个聚合物分子组装到碳纳米管上的可能性，其最终效果是以可预测的方式改变了聚合物的电子性能和结构。为此，显然，必须寻求对共轭聚合物和碳纳米管之间相互作用的更详细的了解。在本文中，我们描述了将聚合物，聚（间亚苯基亚乙烯基-co-2,5-二辛氧基-对-亚苯基亚乙烯基）（PmPV）组装成围绕单壁碳纳米管的涂层的方法。使用扫描隧道显微镜和扫描隧道光谱，我们证明了组装材料的低能量电子结构主要由纳米管的一维性质所决定，如van Hove奇异性所反映。此外，我们使用光谱学检查了在更高能量下对电子结构的修饰，这表明通过引入纳米管可以改变聚合物的电子结构。

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