In this paper a nanocomposite system is proposed to accurately measure pressure generated by normal force. The strain sensing function is achieved by correlating the piezoresistance variations to the normal force applied on the sensing area. Due to the conductive network formed by carbon nanofibers (CNFs) and the tunneling resistance change between neighboring CNFs the electrical resistance measured using the four-probe method shows a clear correlation with the load conditions. In order to improve the piezoresistivity, CNF are uniformly dispersed in PDMS using a solvent assisted ultra-sonication method. The proposed nanocomposite based strain sensor is experimentally characterized under both quasi-static and cyclic load conditions.

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