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Article

Directional Response of Randomly Dispersed Carbon Nanotube Strain Sensors

1
Department of Aeronautics, Universidad Politecnica de Madrid, 28040 Madrid, Spain
2
Area of Materials Science and Engineering, Universidad Rey Juan Carlos, 28933 Madrid, Spain
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(10), 2980; https://doi.org/10.3390/s20102980
Received: 14 April 2020 / Revised: 19 May 2020 / Accepted: 22 May 2020 / Published: 24 May 2020
(This article belongs to the Special Issue Carbon Nanotube and Graphene-based Sensors)
Tests on a double lap bonded joint, with transverse strips of randomly oriented carbon nanotubes (CNT) sprayed onto an epoxy adhesive film, showed a positive increment in electrical resistance under tensile load, even though the transverse strains were negative. Other experiments included in this work involved placing longitudinal and transversal CNT sensors in a tensile loaded aluminum plate, and, as reported by other authors, the results confirm that the resistance change is not only dependent on the strains oriented with the electrode line, while the other strain components also influence the response. This behavior is quite different to that of conventional strain gages which have a near zero sensitivity to strains not aligned to the sensor direction. The dependence of the electrical response on all the strain components makes it quite difficult, possibly unfeasible, to experimentally determine the individual strain components with this kind of sensors; however, the manufacturing of aligned CNT sensors could deal with this issue. View Full-Text
Keywords: strain monitoring; bonded joints; multidirectional sensors; doped resins strain monitoring; bonded joints; multidirectional sensors; doped resins
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MDPI and ACS Style

Güemes, A.; Pozo Morales, A.R.; Fernandez-Lopez, A.; Sanchez-Romate, X.X.F.; Sanchez, M.; Ureña, A. Directional Response of Randomly Dispersed Carbon Nanotube Strain Sensors. Sensors 2020, 20, 2980. https://doi.org/10.3390/s20102980

AMA Style

Güemes A, Pozo Morales AR, Fernandez-Lopez A, Sanchez-Romate XXF, Sanchez M, Ureña A. Directional Response of Randomly Dispersed Carbon Nanotube Strain Sensors. Sensors. 2020; 20(10):2980. https://doi.org/10.3390/s20102980

Chicago/Turabian Style

Güemes, Alfredo, Angel Renato Pozo Morales, Antonio Fernandez-Lopez, Xoan Xose F. Sanchez-Romate, Maria Sanchez, and Alejandro Ureña. 2020. "Directional Response of Randomly Dispersed Carbon Nanotube Strain Sensors" Sensors 20, no. 10: 2980. https://doi.org/10.3390/s20102980

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