"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

I agree, do not show this message again.

Mott-hopping processes in polymethylmethacrylate matrices filled with polypyrrole particles

M. EL HASNAOUI1,* , K. ABAZINE1, M. E. ACHOUR1, L. C. COSTA2

Affiliation

  1. LASTID Laboratory, Physics Department, Faculty of Sciences, Ibn-Tofail University, BP 133, Kénitra, Morocco
  2. I3N and Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal.

Abstract

The electrical properties of polypyrrole/polymethylmethacrylate composites containing 2 - 8 wt% polypyrrole particles were characterized. For temperatures below the glass transition of the composite, the frequency dependence of the ac conductivity, in the range 102 – 2×105 Hz, showed a sub-linear dispersive behaviour, i.e., it was found to be proportional to ω s , where ω is the angular frequency. The frequency exponent s was interpreted using the correlated barrier-hopping model. The temperature dependence of the dc conductivity gave evidence of a transport mechanism based on the three dimensional Mott's variable-range hopping. Using this model we were able to calculate meaningful values for the density of states, hopping distance and hopping energy.

Keywords

Polymer composites; Transport properties; Mott’s parameters; Conductivity; Density of states.

Submitted at: June 6, 2015
Accepted at: April 5, 2016

Citation

M. EL HASNAOUI, K. ABAZINE, M. E. ACHOUR, L. C. COSTA, Mott-hopping processes in polymethylmethacrylate matrices filled with polypyrrole particles, Journal of Optoelectronics and Advanced Materials Vol. 18, Iss. 3-4, pp. 389-393 (2016)