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Open AccessArticle

Temperature Self-Compensated Strain Sensors based on MWCNT-Graphene Hybrid Nanocomposite

1
Measurements and Sensor Technology, Technical University of Chemnitz, 09126 Chemnitz, Germany
2
Federal University of ABC, Campus Santo André, 09210-580 Santo André, Brazil
*
Author to whom correspondence should be addressed.
J. Compos. Sci. 2019, 3(4), 96; https://doi.org/10.3390/jcs3040096
Received: 21 June 2019 / Revised: 3 November 2019 / Accepted: 4 November 2019 / Published: 7 November 2019
(This article belongs to the Special Issue Recent Advances in Graphene-based Nanocomposites)
Sensors based on carbon nanomaterials are gaining importance due to their tunable properties and their potentially outstanding sensing performance. Despite their advantages, carbon-based nanomaterial sensors are prone to cross-sensitivities with environmental factors like temperature. Thus, to reduce the temperature influence on the sensing material, compensation and correction procedures are usually considered. These methods may require the use of additional sensors which can themselves be subject to residual errors. Hence, a more promising approach consists of synthesizing a material that is capable of self-compensating for the influence of temperature. In this study, a hybrid nanocomposite based on multi-walled carbon nanotubes (MWCNT) and graphene is proposed, which can compensate, by itself, for the influence of temperature on the material conductivity. The hybrid nanocomposite material uses the different temperature behavior of MWCNTs, which have a negative temperature coefficient, and graphene, which has a positive temperature coefficient. The influence of the material ratio and dispersion quality are investigated in this work. Material composition and dispersion quality are analyzed using Raman spectroscopy and scanning electron microscopy (SEM). A composition of 70% graphene and 30% MWCNT exhibits a nearly temperature-independent hybrid nanocomposite with a sensitivity of 0.022 Ω/°C, corresponding to a resistance change of ~1.2 Ω for a temperature range of 25 to 80 °C. Additionally, a simple investigation of the strain sensing behavior of the hybrid material is also presented. The hybrid nanocomposite-based, thin-film strain sensor exhibits good stability over 100 cycles and a significantly high gauge factor, i.e., 16.21. View Full-Text
Keywords: temperature self-compensation; hybrid material; carbon nanotubes; graphene; nanocomposite; strain sensor temperature self-compensation; hybrid material; carbon nanotubes; graphene; nanocomposite; strain sensor
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Ramalingame, R.; Bautista-Quijano, J.R.; Alves, D.F.; Kanoun, O. Temperature Self-Compensated Strain Sensors based on MWCNT-Graphene Hybrid Nanocomposite. J. Compos. Sci. 2019, 3, 96.

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