PAni-PMMA Blends for Cryomagnetic Temperature Sensor Applications

摘要

Blends of polyaniline (PAni) with polymethylmethacrylate (PMMA) have electrical resistivity values which are comparable to those of disordered semiconductors such as heavily doped germanium, especially at low temperatures. We report resistance versus temperature (R-T) data for these blends containing 33% and 40% PAni, in the temperature interval 0.35 K - 10 K and compare the same with that of a commercial germanium thermometer. R-T data in the presence of applied magnetic fields up to 5.5 T are also presented. The sensitivity of these blends is about 0.1 mK at temperatures below 1 K. The data are discussed with special reference to the suitability of these materials as cryomagnetic temperature sensors and as elements of a temperature controller based on fuzzy logic.