NMRD of polyaniline-based conducting polymers

Nuclear magnetic resonance dispersion (NMRD) is a technique for measuring NMR relaxation times, which is commonly used to study dynamics in condensed matter. In this paper, we present NMRD profiles, for polyanilines doped with trifluoromethanesulfonic acid (TFSA), recorded as a function of temperature and dopant concentration. This work demonstrates that NMRD can be used to characterise the critical processes that determine the conductivity of the materials. The NMRD profile of the bulk polymer is sensitively dependent on the concentration of the dopant, while the response of the dopant is insensitive to concentration. Complete analysis of the NMRD profiles of these ICPs will give important information, including the rates of spin diffusion and of charge transport between dopant-rich domains.