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HL: Fachverband Halbleiterphysik

HL 61: Poster II: Materials, Interfaces and Heterostructures

HL 61.11: Poster

Donnerstag, 25. März 2010, 18:00–20:00, Poster D1

Electric properties of multiwall carbon nanotubes with defects — •Andreas Stetter, Johann Vancea, and Christian H. Back — Universität Regensburg

Carbon nanotubes are of high interest for future electronics. However, the performance of an electronic device generally depends on the quality of the material. Therefore, it is fundamental to study the properties of non ideal tubes.

We investigated the electric response on several defects in current conducting multiwall carbon nanotubes using scanning tunnelling potentiometry. This technique yields a potential profile along the tube while a current is flowing through it. We observed a voltage drop at the end of an incomplete outermost shell. We used this potential profile to separate the intrashell resistance and the intershell conductance. Furthermore, we studied a stretched carbon nanotube with a kink, where a strong increase in the resistance was observed.