Effect of functionalized nanotubes with HNO.sub.3./sub. on electrical sensory properties of carbon nanotubes/polyurethane composite under elongation

0367462 - ÚH 2012 RIV US eng C - Conference Paper (international conference)
Slobodian, P. - Olejník, R. - Říha, Pavel - Sáha, P.
Effect of functionalized nanotubes with HNO₃ on electrical sensory properties of carbon nanotubes/polyurethane composite under elongation.
Mathematical Methods and Techniques in Engineering and Environmental Science. Stevens Point, Wisconsin: WSEAS Press, 2011 - (Demiralp, M.; Bojkovic, Z.; Repanovici, A.), s. 312-316. ISBN 978-1-61804-046-6.
[WSEAS International Conference on Sensors and Signals /4./. Catania (IT), 03.11.2011-05.11.2011]
Grant - others:Interní grantová agentura UTB(CZ) IGA/3/FT/11/D; GA MŠk(CZ) ED2.1.00/03.0111
Institutional research plan: CEZ:AV0Z20600510
Keywords : carbon nanotubes * oxidation * flexible composites * strain sensor * Gauge factor * resistance
Subject RIV: JB - Sensors, Measurment, Regulation

Thermoplastic polyurethane elastomer PU/MWCNT network composite was prepared and tested as tensile strain sensing element. In the first step MWCNT aqueous dispersion was filtered thought PU filtering membrane prepared by technology of electrospinning. The filtering membrane remains as a part of final composite when this filter-supported MWCNT network is attached to the surface of PU tensile test specimens by technology of compression molding and the filter is transformed to form of PU adhesive film. The composite can sustain large deformation and the stain can be effectively detected by resistance measurement in real time of deformation. Furthermore, the sensitivity of PU/MWCNT sensoric unit was significantly improved by CNT oxidation by HNO₃ acid. This enhancement was quantified by a gauge factor. Its value, for example, increase from 9.5 at tensile strain ~9 % for pure network to 23.1 for network made of oxidized tubes measured at the same strain.
Permanent Link: http://hdl.handle.net/11104/0202141