Effect of pre-strain and KMnO4 oxidation of carbon nanotubes embedded in polyurethane on strain dependent electrical resistance of the composite

0483265 - ÚH 2019 RIV GB eng J - Journal Article
Slobodian, P. - Říha, Pavel - Olejník, R. - Matyáš, J.
Effect of pre-strain and KMnO4 oxidation of carbon nanotubes embedded in polyurethane on strain dependent electrical resistance of the composite.
Sensor Review. Roč. 38, č. 2 (2018), s. 163-170. ISSN 0260-2288. E-ISSN 1758-6828
Grant - others:Ministerstvo školství, mládeže a tělovýchovy (MŠMT)(CZ) LO1504; Ministerstvo školství, mládeže a tělovýchovy - GA MŠk(CZ) ED2.1.00/19.0409
Institutional research plan: CEZ:AV0Z20600510
Institutional support: RVO:67985874
Keywords : nanotechnology * sensors * polymer sensors * carbon nanotubes * polyurethane composite * transverse cracking
OECD category: Nano-processes (applications on nano-scale)
Impact factor: 1.264, year: 2018

Purpose - The synergistic effect of functionalization of multi-walled carbon nanotubes (CNT) using KMnO4 oxidation and initial tensile deformation on the electrical resistance of nanotube network/polyurethane composite subjected to elongation was studied.

Design/methodology/approach - Though the initial deformation irreversibly changed the arrangement of carbon nanotube network, subsequent cyclic elongation confirmed stable resistance values. The increased strain-dependent resistance of stimulated nanotube network/polyurethane composite was demonstrated by monitoring vibration of tambour leather after a bead impact and finger flexion.

Findings - The results showed a tenfold composite resistance increase for the composite prepared from KMnO4 oxidized nanotubes, quantified by a so-called gauge factor, from a value of about 20 in comparison to the network prepared from pristine nanotubes. This is a substantial increase, which ranks the stimulated composite among materials with the highest electromechanical response.

Originality/value - The results in this paper are new and have not been published yet. The paper combines different ideas which are developed together. It presents a new concept of synergistic effect of CNT oxidation and application of pre-strain simulation. Oxidation and pre-strain increases by several times the sensitivity of the tested composites which are predetermined for use as strain sensors of various sizes and shapes.
Permanent Link: http://hdl.handle.net/11104/0282294