Next Article in Journal
Ultra-Sensitive NT-proBNP Quantification for Early Detection of Risk Factors Leading to Heart Failure
Previous Article in Journal
Time-Resolved Diffuse Optical Spectroscopy and Imaging Using Solid-State Detectors: Characteristics, Present Status, and Research Challenges
Article Menu
Issue 9 (September) cover image

Export Article

Open AccessArticle
Sensors 2017, 17(9), 2108; https://doi.org/10.3390/s17092108

Underlying Physics of Conductive Polymer Composites and Force Sensing Resistors (FSRs) under Static Loading Conditions

1
Faculty of Electronic and Biomedical Engineering, Universidad Antonio Nariño, Tunja 150001, Colombia
2
Faculty of Sciences, Universidad Antonio Nariño, Tunja 150001, Colombia
3
Grupo de Física de Materiales (GFM), Universidad Pedagógica y Tecnológica de Colombia, Tunja 150003, Colombia
*
Author to whom correspondence should be addressed.
Received: 22 June 2017 / Revised: 25 July 2017 / Accepted: 25 July 2017 / Published: 14 September 2017
(This article belongs to the Section Physical Sensors)
Full-Text   |   PDF [11007 KB, uploaded 14 September 2017]   |  

Abstract

Conductive polymer composites are manufactured by randomly dispersing conductive particles along an insulating polymer matrix. Several authors have attempted to model the piezoresistive response of conductive polymer composites. However, all the proposed models rely upon experimental measurements of the electrical resistance at rest state. Similarly, the models available in literature assume a voltage-independent resistance and a stress-independent area for tunneling conduction. With the aim of developing and validating a more comprehensive model, a test bench capable of exerting controlled forces has been developed. Commercially available sensors—which are manufactured from conductive polymer composites—have been tested at different voltages and stresses, and a model has been derived on the basis of equations for the quantum tunneling conduction through thin insulating film layers. The resistance contribution from the contact resistance has been included in the model together with the resistance contribution from the conductive particles. The proposed model embraces a voltage-dependent behavior for the composite resistance, and a stress-dependent behavior for the tunneling conduction area. The proposed model is capable of predicting sensor current based upon information from the sourcing voltage and the applied stress. This study uses a physical (non-phenomenological) approach for all the phenomena discussed here. View Full-Text
Keywords: conductive polymer composite; FSR; piezoresistive sensor; quantum tunneling; force sensor; pressure sensor; quantum point contact conductive polymer composite; FSR; piezoresistive sensor; quantum tunneling; force sensor; pressure sensor; quantum point contact
Figures

Figure 1

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).

Supplementary material

SciFeed

Share & Cite This Article

MDPI and ACS Style

Paredes-Madrid, L.; Palacio, C.A.; Matute, A.; Parra Vargas, C.A. Underlying Physics of Conductive Polymer Composites and Force Sensing Resistors (FSRs) under Static Loading Conditions. Sensors 2017, 17, 2108.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top