Open AccessElectrical and NO2 Sensing Properties of a Series of Liquid Crystalline Porphyrins
Author(s) -
Necmettin Kılınç,
Ali Şems Ahsen,
Zafer Ziya Öztürk
Publication year - 2020
Publication title -
ecs journal of solid state science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.488
H-Index - 51
eISSN - 2162-8777
pISSN - 2162-8769
DOI - 10.1149/2162-8777/ababdd
Subject(s) - polaron , materials science , porphyrin , atmospheric temperature range , electrical resistivity and conductivity , conductivity , thermal conduction , range (aeronautics) , quantum tunnelling , ion , analytical chemistry (journal) , condensed matter physics , thermodynamics , optoelectronics , chemistry , electron , photochemistry , organic chemistry , electrical engineering , composite material , physics , quantum mechanics , engineering
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.
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