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Materials 2017, 10(11), 1334; https://doi.org/10.3390/ma10111334

Underlying Physics of Conductive Polymer Composites and Force Sensing Resistors (FSRs). A Study on Creep Response and Dynamic Loading

1
Faculty of Electronic and Biomedical Engineering, Universidad Antonio Nariño, Tunja 150001, Colombia
2
Grupo de Física de Materiales (GFM), Universidad Pedagógica y Tecnológica de Colombia, Tunja 150003, Colombia
3
Faculty of Mechanical Engineering, Universidad Antonio Nariño, Tunja 150001, Colombia
*
Author to whom correspondence should be addressed.
Received: 26 October 2017 / Revised: 9 November 2017 / Accepted: 15 November 2017 / Published: 21 November 2017
(This article belongs to the Section Advanced Composites)
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Abstract

Force Sensing Resistors (FSRs) are manufactured by sandwiching a Conductive Polymer Composite (CPC) between metal electrodes. The piezoresistive property of FSRs has been exploited to perform stress and strain measurements, but the rheological property of polymers has undermined the repeatability of measurements causing creep in the electrical resistance of FSRs. With the aim of understanding the creep phenomenon, the drift response of thirty two specimens of FSRs was studied using a statistical approach. Similarly, a theoretical model for the creep response was developed by combining the Burger’s rheological model with the equations for the quantum tunneling conduction through thin insulating films. The proposed model and the experimental observations showed that the sourcing voltage has a strong influence on the creep response; this observation—and the corresponding model—is an important contribution that has not been previously accounted. The phenomenon of sensitivity degradation was also studied. It was found that sensitivity degradation is a voltage-related phenomenon that can be avoided by choosing an appropriate sourcing voltage in the driving circuit. The models and experimental observations from this study are key aspects to enhance the repeatability of measurements and the accuracy of FSRs. View Full-Text
Keywords: conductive polymer composite; FSR; creep; Burger’s model; quantum tunneling; force sensor; pressure sensor conductive polymer composite; FSR; creep; Burger’s model; quantum tunneling; force sensor; pressure sensor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Paredes-Madrid, L.; Matute, A.; Bareño, J.O.; Parra Vargas, C.A.; Gutierrez Velásquez, E.I. Underlying Physics of Conductive Polymer Composites and Force Sensing Resistors (FSRs). A Study on Creep Response and Dynamic Loading. Materials 2017, 10, 1334.

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