Author/Authors :
Gomis، نويسنده , , V. and Bellver، نويسنده , , D. and Ferrer-Anglada، نويسنده , , N. and Ribَ، نويسنده , , J.M. and El-Hachemi، نويسنده , , Z. and Movaghar، نويسنده , , B.، نويسنده ,
Abstract :
An unusual negative differential resistance (NDR) has been observed in I–V response in p-toluensulfonate-doped polypyrrole films, leading to a conductivity switching effect of almost four orders of magnitude. The effect appears at temperatures below 20 K for highly conducting samples while it is displaced to temperatures close to the room temperature for more resistive samples. The observed correlation between conductivity and switching phenomenon provides a fingerprint of the influence played by the sample nanostructure. The relation between the chemical structure of the material and the observed physical phenomenon is discussed.
Keywords :
conducting polymer , Polypyrrole , Metal–insulator phase transition , electrical conductivity
