Resumen de Raman spectroscopy and electrical properties of polypyrroledoped dodecylbenzene sulfonic acid/Y_(2)O_(3)composites (7 pages)
M. Irfan, A. Mustafa, A. Shakoor, A.N. Niaz, N. Anwar, M. Imran, A. Majid
The doped dodecylbenzene sulfonic acid (DBSA) with polypyrrole (PPy) and also incorporated an increasing concentration of Y_(2)O_(3) to obtainthe composites of PPy-DBSA-Y_(2)O_(3) via chemical polymerization technique. The PPy-DBSA-Y_(2)O_(3) composites formation were confirmedby interaction between PPy-DBSA and Y_(2)O_(3)-particles utilizing Raman spectroscopy. The SEM micrographs show that the composites arein the form of lengthened chains; increase in the particles size as equated with pristine PPy and Y_(2)O_(3) was also studied. Thermal stabilityof PPy-DBSA- Y_(2)O_(3) composites was improved as enhanced the load of Y_(2)O_(3)-particles. The increase in DC conductivity by mixing Y_(2)O_(3) into PPy-DBSA at all temperatures showed the three-dimensional Mott’s variable range hopping model. Density of localized states, hoppingdimension as well as activation energy are computed and found to be affected due to the presence of Y_(2)O_(3) in DBSA-PPy. The ESR of Y_(2)O_(3) (∼12Ω), PPy (∼11.80Ω), PPy-DBSA (∼11.30Ω) and PPy-DBSA-8%Y_(2)O_(3) composite (∼9.50Ω). EIS results confirm that thePPy-DBSA-8% Y_(2)O_(3) composite with a low value of impedance gives a maximum value of electrical conductivity.
