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TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology

» presentations   » 2010.03.25

Controlling the kink angle of intramolecular carbon nanotube junctions: A combined experimental and theoretical study

J. Blüher, J. Kunstmann, I. Ibrahim, A. Bachmatiuk, F. Börrnert, M. Rümmeli, and G. Cuniberti

DPG-Frühjahrstagung der Sektion Kondensierte Materie (SKM)
DPG Spring Meeting of the Section Condensed Matter (SKM)

2010.03.25; (H 16) Regensburg, Germany

Intramolecular carbon nanotube (CNT) junctions are nanotubes with kinks generated by heptagon-pentagon defect pairs. They are very attractive functional building blocks for future electronics, as they can be used as diodes and transistors. Usually CNT junctions are synthesized incidentally [1]. Using chemical vapor deposition techniques we are trying to grow CNT junctions in a more controlled way. In particular, we want to control the kink angle in order to produce junctions with well defined electronic properties. Our approach raises the question: Are there special kink angles that induce a certain change in electronic properties? In order to answer this question we developed a scheme that allows generating the atomic structure of CNT junctions with an arbitrary number of heptagon-pentagon defects. To break down the large number of different geometrical possibilities to achieve a CNT junction with a specific angle we study the energetics of different de- fect combinations and discuss the implication of these results for the experimental realization of well defined CNT junctions.
[1]Wei et al., Adv. Mater. 20, 2815 (2008).

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