Impedance Behavior of Conducting Piezoresistive Polymer Composite

Abstract

Conducting polymers (CP) are used as piezoresistive sensors for the various application of monitoring human and structural health monitoring, flexible electronic devices, automobile, aerospace and for biomedical device applications. In the present work we have developed the polyvinylidene fluoride (PVDF) based CP using Carbon Nano Fiber (CNF). The samples were prepared using the solvent casting technique. The conductivity plays crucial role in improving the sensitivity of the sensors. The impedance behavior of the developed PVDF/CNF membranes was analysed using the E4900A impedance analyzer using the parallel plate probes. The impedance was measured as the function of frequency in the range of 20 Hz-1 MHz. The piezoresistive behavior of PVDF is an important parameter for sensing application. The objective of the present work was to study the impedance spectroscopy of the PVDF/CNF samples. The sample composition of PVDF/CNF (90/10) and PVDF/CNF (85/15) showed better results with lower resistance and higher conductivity.