Hysteresis Phenomenon in Heat–Voltage Curves of Polypyrrole-Coated Electrospun Nanofibrous and Regular Fibrous Mats

This article verifies the hysteresis phenomenon in heat–voltage curves of polypyrrole-coated electrospun nanofibrous and regular fibrous mats. A third-order polynomial model fits the heat–voltage data better than a second-order polynomial model. It was also observed that the hysteresis loop area of nanofibrous and regular fibrous mats increases with decreasing fiber diameter. Moreover, the curvature of the hysteresis loops is significantly affected by the fiber diameter. In fact, the slope of the curvatures increases with decreasing fiber diameter.