Construção de uma fonte de corrente e de uma sonda para medida de condutividade pelo método da sonda de quatro pontas

A novel soluble poly(fluorenylenevinylene) conjugated polymer: synthesis, characterization and application to optoelectronic devices

“…Pressed discs of the polymer were exposed in a closed vessel to iodine vapor for 24 h, and the electrical conductivity was measured immediately after removal from the vessel using the four-probe and the two-probe methods. 18,19 The average conductivity was (9.5 ¡ 0.5) 6 10 27 S cm 21 , which is five times lower than the value measured 16 for iodine doped unsubstituted PPV (5 6 10 26 S cm 21 ) under the same experimental conditions. This difference may reflect a larger separation between the chains owing to steric hindrance caused by the long side-substituents, diminishing inter-chain conduction processes.…”

Synthesis of a novel poly(p-phenylene-vinylene) derivative and its application in chemiresistive sensors for electronic noses with an unusual response to organic vapours

“…These data show the importance of the presence of a long side chain in enhancing the solubility of relatively high average molecular weight polymers. Pressed discs of the polymer were exposed in a closed vessel to iodine vapour, for 24 h, and the electrical conductivity measured immediately after removal from the vessel using the four-probe [12] and the two-probe [13] methods. The average conductivity was (2.0 ± 0.5) · 10 -6 S/cm, which is close to the value measured [14] for iodine-doped unsubstituted PPV (5·10 -6 S/cm) under the same experimental conditions.…”