Universität Wien

Physics and Technology of Nanotubes@Nanotubes (PATONN)
Physik und Technonolgie von Nanotubes@Nanotubes

Marie-Curie Scholarship of the EU for Dr. F. Simon,
6th Frame Program

Contract Nr MEIF-CT-2003-501099

Extension: 01.11.2003 – 30.10.2005

Project Abstract

Carbon nanotubes (CNT) represent the one dimensional form of carbon. Related to their appealing needle-like structure, they possess a number of peculiar mechanical and electronic properties, which makes them promising candidates for nano-devices. The single walled version of CNTs (SWCNT) are even more interesting due to their well defined geometry and small. Doping and modifications of single wall CNTs (SWCNTs) have attracted considerable interest. The C60 doped SWCNT, (C60@SWCNT) combines two fundamental forms carbon. Recently, it has been shown that a suitable high temperature treatment transforms the filled-in C60 into a SWCNT that occupies the interior of a SWCNT. The inner tubes of this double wall carbon nanotube (DWCNT) structure are unique as they are formed in a catalyst free environment and such tubes have a highly perfect, defect-less structure as the host institute has demonstrated. Superior mechanical and electronic properties make DWCNTs a promising candidate for applications such as transistor electrodes in future electronics, cantilever material for scanning probe microscopy and many more. DWCNT growth will be studied from C60@SWCNT in successive heat treatment steps using transmission electron microscopy and Raman spectroscopy. We also intend to grow hetero-inner tube DWCNTs starting from heteromolecule@SWCNT. The charge transfer from alkali dopants to DWCNT will be studied using in-situ Raman and dc transport studies. It is yet unknown how charge transfer affects the electronic properties of DWCNTs. Individual DWCNTs will be studied using Raman microscopy and scanning probe microscopy. DWCNTs will be isolated on a substrate in low density. Studies of the same individual DWCNT using the these methods enables to correlate the Raman information on the tube diameter and its electronic state with the information attainable from scanning probe microscopy such as nanotube helicity (using STM) and joint density of states of DWCNTs (using STS).