Self-sensing of strain in a fiber glass/epoxy composite by built-in stripe of carbon nanotubes with Ag nanoparticles

0495927 - ÚH 2019 RIV ES eng A - Abstract
Slobodian, P. - Říha, Pavel - Olejník, R. - Matyáš, J. - Daňová, R. - Schledjewski, R.
Self-sensing of strain in a fiber glass/epoxy composite by built-in stripe of carbon nanotubes with Ag nanoparticles.
Journal of Material Sciences & Engineering. Barcelona: OMICS International, 2018. Roč. 7, June (2018), s. 181-182. ISSN 2169-0022.
[World Congress on Materials Science and Engineering /19./. 11.06.2018-13.06.2018, Barcelona]
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 : carbon nanotubes * glass fibers * electrical properties * deformation * epoxy laminate
OECD category: Nano-processes (applications on nano-scale)

Statement of the Problem: Strain sensing composite materials have attracted considerable attention for their unique characteristics exceeding conventionally applied materials. Between different solutions and various types of transducers available for these applications, piezo-resistive strain sensors are among the most investigated ones usually based on conductive polymer composites prepared by embedding of electrically conductive fillers as carbon nanotubes into a polymeric matrix. This principle can be used for monitoring of deformation or stress stimulus in elongation or compression. The responses are sensitive and reversible with sufficient durability in the dynamic loadings measured by a macroscopic electrical resistance change. Methodology & Theoretical Orientation: In our contribution we introduce a strain sensing composite material composed of electrically conductive entangled network of Ag decorated multiwalled carbon nanotubes (MWCNTs) integrated into the glass fiber/epoxy composite. A vacuum infusion technique was used for the composite fabrication. The experimental results revealed that an integrated strain sensing exhibit long term electromechanical stability which was linked to the level of strain in the host glass fiber/epoxy structure. It has been proven that modification of pristine MWCNTs with Ag nanoparticles increase the sensitivity to applied strain. Simultaneously pre-strain stimulation was also applied to further enhance detection ability. The resistance sensitivity, quantified by a gauge factor, increased more than hundredfold for a pre-strained sensor with Ag decorated nanotubes in comparison with the value of about 5 for sensor with pristine nanotubes. This is a substantial increase which ranks this new material among strain gauges with the highest electromechanical sensitivity. The obtained data indicated also a reasonable stability of the measurement with no effect of load alterations on the sensor resistance changes. Additionally, the thermoelectric properties, Joule heating and antennal signal reception by MWCNT stripe will be mentioned.
Permanent Link: http://hdl.handle.net/11104/0288784