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Article

Multifunctional Graphene–Polymer Nanocomposite Sensors Formed by One-Step In Situ Shear Exfoliation of Graphite

1
Department of Mechanical Engineering, University of Texas Rio Grande Valley, Edinburg, TX 78539, USA
2
Mechanical and Aerospace Engineering Department, Rutgers University, New Brunswick, NJ 08854, USA
3
Department of Electrical & Computer Engineering, University of Texas Rio Grande Valley, Edinburg, TX 78539, USA
*
Authors to whom correspondence should be addressed.
J. Compos. Sci. 2023, 7(8), 309; https://doi.org/10.3390/jcs7080309
Submission received: 16 June 2023 / Revised: 19 July 2023 / Accepted: 24 July 2023 / Published: 27 July 2023
(This article belongs to the Section Polymer Composites)

Abstract

Graphene nanocomposites are a promising class of advanced materials for sensing applications; yet, their commercialization is hindered due to impurity incorporation during fabrication and high costs. The aim of this work is to prepare graphene–polysulfone (G−PSU) and graphene–polyvinylidene fluoride (G−PVDF) nanocomposites that perform as multifunctional sensors and are formed using a one-step, in situ exfoliation process whereby graphite is exfoliated into graphene nanoflakes (GNFs) directly within the polymer. This low-cost method creates a nanocomposite while avoiding impurity exposure since the raw materials used in the in situ shear exfoliation process are graphite and polymers. The morphology, structure, thermal properties, and flexural properties were determined for G−PSU and G−PVDF nanocomposites, as well as the electromechanical sensor capability during cyclic flexural loading, temperature sensor testing while heating and cooling, and electrochemical sensor capability to detect dopamine while sensing data wirelessly. G−PSU and G−PVDF nanocomposites show superior mechanical characteristics (gauge factor around 27 and significantly enhanced modulus), thermal characteristics (stability up to 500 °C and 170 °C for G−PSU and G−PVDF, respectively), electrical characteristics (0.1 S/m and 1 S/m conductivity for G−PSU and G−PVDF, respectively), and distinguished resonant peaks for wireless sensing (~212 MHz and ~429 MHz). These uniquely formed G−PMC nanocomposites are promising candidates as strain sensors for structural health monitoring, as temperature sensors for use in automobiles and aerospace applications, and as electrochemical sensors for health care and disease diagnostics.
Keywords: graphene; polymer; nanocomposite; sensing graphene; polymer; nanocomposite; sensing
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MDPI and ACS Style

Ashraf, A.; Chang, E.; Rahman, M.A.; Ghosh, D.; Islam, N.; Lynch-Branzoi, J.K. Multifunctional Graphene–Polymer Nanocomposite Sensors Formed by One-Step In Situ Shear Exfoliation of Graphite. J. Compos. Sci. 2023, 7, 309. https://doi.org/10.3390/jcs7080309

AMA Style

Ashraf A, Chang E, Rahman MA, Ghosh D, Islam N, Lynch-Branzoi JK. Multifunctional Graphene–Polymer Nanocomposite Sensors Formed by One-Step In Situ Shear Exfoliation of Graphite. Journal of Composites Science. 2023; 7(8):309. https://doi.org/10.3390/jcs7080309

Chicago/Turabian Style

Ashraf, Ali, Elizabeth Chang, Md Ashiqur Rahman, Dipannita Ghosh, Nazmul Islam, and Jennifer K. Lynch-Branzoi. 2023. "Multifunctional Graphene–Polymer Nanocomposite Sensors Formed by One-Step In Situ Shear Exfoliation of Graphite" Journal of Composites Science 7, no. 8: 309. https://doi.org/10.3390/jcs7080309

APA Style

Ashraf, A., Chang, E., Rahman, M. A., Ghosh, D., Islam, N., & Lynch-Branzoi, J. K. (2023). Multifunctional Graphene–Polymer Nanocomposite Sensors Formed by One-Step In Situ Shear Exfoliation of Graphite. Journal of Composites Science, 7(8), 309. https://doi.org/10.3390/jcs7080309

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