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MM: Fachverband Metall- und Materialphysik

MM 45: Nanomaterials - Nanospheres & Fibres

MM 45.3: Vortrag

Mittwoch, 13. März 2013, 17:00–17:15, H26

Electrical properties of different kinds of multi-walled carbon nanotubes powders — •Abdelwahab Hassan¹, Silke Hampel¹, Christian Hess¹, Anatoly Romanenko², Manfred Ritschel¹, Albrecht Leonhardt¹, and Bernd Buechner¹ — ¹IFW-Dresden, D-01171 Dresden, Germany — ²Institute of Inorganic Chemistry, Novosibirsk 630090, Russia

Carbon nanotubes have attracted great interest due to their remarkable structure, electrical and mechanical properties. Among various other properties of CNTs studied so far, the electrical transport properties are still unclear and needs a lot of attention. The electrical properties are strongly dependent on the structure of the nanotubes which varied with the quality of the CNTs. Different kinds of multi-walled carbon nanotubes MWCNT were synthesised by two CVD techniques (aerosol and fixed-bed CVD).The aim of this work is to study and compare the electrical properties as a function of synthesis condition and treatments of MWCNT powders. Morphologies of these MWCNTs are studied using Scanning Electron Microscopy and Transmission Electron Microscopy. The electrical measurements were separately carried out in two temperature ranges (4-294 K and 300-570 K) by four point technique. In the high temperature range 300-570 K, the conduction was found to be thermally activated and well described by Arrhenius type behaviour. However, in the low temperature range (4-294 K),the measured data gives a good fit to variable-range hopping (VRH) and the results are interpreted using Motts (VRH) model. By using these models, various interesting electrical parameters have been calculated.