Journal
COMPOSITES PART B-ENGINEERING
Volume 43, Issue 6, Pages 2711-2717Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2012.04.022
Keywords
Smart materials; Nano-structures; Polymer-matrix composites; Electrical properties
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Two types of carbon nanotube nanocomposite strain sensors were prepared by mixing carbon nanotubes with epoxy (nanocomposite sensor) and sandwiching a carbon nanotube film between two epoxy layers (sandwich sensor). The conductivity, response and sensitivity to static and dynamic mechanical strains in these sensors were investigated. The nanocomposite sensor with 2-3 wt.% carbon nanotube demonstrated high sensitivity to mechanical strain and environmental temperature, with gauge factors of 5-8. On the other hand, a linear relationship between conductivity and dynamic mechanical strain was observed in the sandwich sensor. The sandwich sensor was also not sensitive to temperature although its strain sensitivity (gauge factor of about 3) was lower as compared with the nanocomposite sensor. Both sensors have excellent response to static and dynamic strains, thereby having great potential for strain sensing applications. (C) 2012 Elsevier Ltd. All rights reserved.
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