Electromechanical sensors based on carbon nanotube networks

0348148 - ÚH 2011 RIV NZ eng C - Conference Paper (international conference)
Slobodian, P. - Říha, Pavel - Olejník, R. - Petráš, D. - Machovský, M. - Sáha, P.
Electromechanical sensors based on carbon nanotube networks.
Proceedings of the Fourth International Conference on Sensing Technology. Palmerston North: Massey University, 2010 - (Mukhopadhyay, S.; Fuchs, A.; Sen Gupta, G.; Lay-Ekuakille, A.), s. 542-547. ISBN 978-0-473-16942-8.
[International Conference on Sensing Technology /4./. Lecce (IT), 03.06.2010-05.06.2010]
R&D Projects: GA AV ČR IAA200600803
Institutional research plan: CEZ:AV0Z20600510
Keywords : carbon nanotube network * compression * electrical conductivity * stress sensor
Subject RIV: BK - Fluid Dynamics

The network of entangled multiwall carbon nanotubes and composite consisting of PS filter-supported nanotube network are introduced as conductors whose conductivity is sensitive to compressive stress both in the course of monotonic stress growth and when loading/unloading cycles are imposed. The testing has shown as much as 100% network conductivity increase at the maximum applied stress. It indicates favorable properties of multiwall carbon nanotube network for its use as a stress-electric signal transducer. To model the conductivity-stress dependence, it is hypothesized that compression increases local contact forces between nanotubes, which results in more conductive contacts. The lack of detailed knowledge of the mechanism is circumvented with a statistical approach. In this respect, good data representation is reached using Weibull distribution for the description of nanotube contact resistance distribution.
Permanent Link: http://hdl.handle.net/11104/0188753