G. Rangarajan et al., Electrical conduction in polyaniline-PMMA blends and their use as cryomagnetic temperature sensors, SYNTH METAL, 119(1-3), 2001, pp. 487-488
Electrical conduction in polymeric conductors is obscured by the presence o
f strong disorder. Localization and Coulomb Interactions play a dominant ro
le. The temperature dependence of the reduced activation energy, W = dln(si
gma)/dln(T), shows that PAni-PMMA blends are on the metallic side of the me
tal-insulator transition. The temperature and field dependences of conducti
vity of PAni - PMMA blends are discussed. ESR line shape changes from a Dys
onian with A/B ratio of about 2.5 to a Lorentzian, mirroring the temperatur
e dependence of electrical conductivity and hence of the skin depth. Compar
ison with the characteristics of commercial semiconductor thermometers show
that these blends can be a viable alternative to them as cryomagnetic temp
erature sensors.