Resumo

IRFAN, M. et al. Raman spectroscopy and electrical properties of polypyrrole doped dodecylbenzene sulfonic acid/Y₂O₃ composites. Rev. mex. fis. [online]. 2024, vol.70, n.1, e7084.  Epub 09-Jan-2026. ISSN 0035-001X.  https://doi.org/10.31349/revmexfis.70.010502.

The doped dodecylbenzene sulfonic acid (DBSA) with polypyrrole (PPy) and also incorporated an increasing concentration of Y2O3 to obtain the composites of PPy-DBSA-Y2O3 via chemical polymerization technique. The PPy-DBSA-Y2O3 composites formation were confirmed by interaction between PPy-DBSA and Y2O3-particles utilizing Raman spectroscopy. The SEM micrographs show that the composites are in the form of lengthened chains; increase in the particles size as equated with pristine PPy and Y2O3 was also studied. Thermal stability of PPy-DBSA-Y2O3 composites was improved as enhanced the load of Y2O3-particles. The increase in DC conductivity by mixing Y2O3 into PPy-DBSA at all temperatures showed the three-dimensional Mott’s variable range hopping model. Density of localized states, hopping dimension as well as activation energy are computed and found to be affected due to the presence of Y2O3 in DBSA-PPy. The ESR of Y2O3 (~12 Ω), PPy (~11.80 Ω), PPy-DBSA (~11.30 Ω) and PPy-DBSA-8% Y2O3 composite (~9.50 Ω). EIS results confirm that the PPy-DBSA-8% Y2O3 composite with a low value of impedance gives a maximum value of electrical conductivity.

Palavras-chave : Raman analysis; EIS; PPy-DBSA; Y₂O₃; DC Conductivity.

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