Electromechanical properties of carbon nanotube networks under compression

0367353 - ÚH 2012 RIV GB eng J - Journal Article
Slobodian, P. - Říha, Pavel - Olejník, R. - Sáha, P.
Electromechanical properties of carbon nanotube networks under compression.
Measurement Science and Technology. Roč. 22, č. 12 (2011), s. 124006. ISSN 0957-0233. E-ISSN 1361-6501
R&D Projects: GA AV ČR IAA200600803
Grant - others:Interní grantová agentura UTB(CZ) IGA/12/FT/10/D; OP VaVpI(XE) CZ.1.05/2.1.00/03.0111
Institutional research plan: CEZ:AV0Z20600510
Keywords : carbon nanotube network * compression * electrical conductivity * stress sensor
Subject RIV: JB - Sensors, Measurment, Regulation
Impact factor: 1.494, year: 2011

The network of entangled multiwall carbon nanotubes and the composite consisting of polystyrene 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. The lack of detailed knowledge of the mechanism as well as an unclear shift from individual contacts to the whole network conductance is circumvented with a statistical approach. In this respect, the conductivity/compression data were fitted well using Weibull distribution for the description of nanotube contact resistance distribution.
Permanent Link: http://hdl.handle.net/11104/0202063