Impedance characteristics of surface pressure-sensitive carbon black/silicone rubber composites

•Flexible pressure-sensitive composites with high sensitivity and quick response.•The linearity of work curve is very good when the impedance’s logarithm changes with the applied load at optimal operating frequency (1KHz).•AC electric field is more applicable operation condition for the soft pressur...

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Bibliographic Details
Published in:Sensors and actuators. A. Physical. 2015-09, Vol.233, p.118-124
Main Authors: Mei, Haixia, Zhang, Ce, Wang, Rui, Feng, Jianchao, Zhang, Tong
Format: Article
Language:English
Subjects:
Alternating current
Carbon black
Coefficients
Flexible pressure sensor
Frequency
Impedance
Pressure sensors
Rubber
Sensors
Silicon
Silicon rubber
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Summary:•Flexible pressure-sensitive composites with high sensitivity and quick response.•The linearity of work curve is very good when the impedance’s logarithm changes with the applied load at optimal operating frequency (1KHz).•AC electric field is more applicable operation condition for the soft pressure sensor of silicon rubber composites.•Dielectric polarization theory is used to explain the sensitive behavior of the pressure sensor.•Internal structure diagrams of CB/SR composites were used to explain the positive pressure coefficient of resistive (PPCR) effect and negative pressure coefficient of capacitive (NPCC) effect. The surface pressure-sensitive characteristics of carbon black/silicon rubber (CB/SR) composites with positive pressure coefficient of impedance (PPCI) effect were researched. The linearity is very good when the impedance’s logarithm changes with the applied load at optimal operating frequency (1KHz). The pressure sensor based on the flexible composites exhibit fast response when pressures are applied and canceled with a response time of 3s. The sensor appears a higher sensitivity in AC electrical field than that in DC electrical field. Dielectric polarization theory was used to explain the sensitive behavior of the pressure sensor. Internal structure diagrams of CB/SR composites were used to explain the positive pressure coefficient of resistive (PPCR) effect and negative pressure coefficient of capacitive (NPCC) effect. AC electric field is applicable for the flexible pressure sensor based on conductive silicon rubber composites.
ISSN:0924-4247
1873-3069
DOI:10.1016/j.sna.2015.06.009