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The electrical and NO 2  sensing properties of a series of porphyrin derivatives (PPC12, PPC16, ZnPPC12) were studied within wide temperature range from 293 to 423 K under the N 2  gas flow and in the frequency range from 1 kHz to 1 MHz for ac electrical measurements. The dc conductivities and the activation energies were found to be in the range of 10 −13 −10 −12  S cm −1  at the room temperature and 0.46–1.03 eV respectively. The increased C number in the alkyl chain and addition of metal ion to the porphyrin causes a decrease in the conductivity. The ac conductivity was well represented by the power law form A ω s . The s parameter depending on temperature was varied 0.79–1.2. The conduction mechanism for all porphyrins could be related to small polaron tunneling (SPT) model. As an application, the NO 2  sensing properties of ZnPPC12 were investigated depending on temperature.

Electrical and NO2 Sensing Properties of a Series of Liquid Crystalline Porphyrins

Electrical and NO₂ Sensing Properties of a Series of Liquid Crystalline Porphyrins