Murali, M.G.Ramya, M.G.Udayakumar, D.Lakshmi, N.B.Philip, R.2026-02-052010Synthetic Metals, 2010, 160, 23-24, pp. 2520-25253796779https://doi.org/10.1016/j.synthmet.2010.09.038https://idr.nitk.ac.in/handle/123456789/27379A donor-acceptor conjugated polymer (PDOThPOD) containing 3,4-didodecyloxythiophene and (1,3,4-oxadiazolyl)benzene units is synthesized by using precursor polyhydrazide route. Cyclic voltammetry studies reveal that the polymer possesses a low-lying LUMO energy level (-3.57 eV). A nanocomposite of polymer PDOThPOD and nano TiO<inf>2</inf> is also prepared. The linear optical properties of PDOThPOD and the nanocomposite are studied using UV-vis absorption spectroscopy and fluorescence emission spectroscopy. z-scan technique is used to study the third order nonlinear optical properties of the polymer and nanocomposite films. Both polymer and nanocomposite films show a strong optical limiting behavior. The value of nonlinear absorption coefficient (?) is found to be of the order of 10-7 m/W, indicating that these materials are potentially suited for fabricating optical limiters. © 2010 Elsevier B.V. All rights reserved.Donor-acceptor conjugated polymersFluorescence emission spectroscopyLinear optical propertiesLUMO energy levelsNano-TiONanocomposite filmNonlinear absorption coefficientOptical limitersOptical limitingOptical limiting behaviorOxadiazolesThird order nonlinear optical propertiesThird-order optical nonlinearitiesUV-Vis absorption spectroscopyz-ScanZ-scan techniqueAbsorptionAbsorption spectroscopyBenzeneBioelectric phenomenaConjugated polymersEmission spectroscopyNanocompositesNonlinear opticsOptical emission spectroscopyOptical materialsOptical propertiesPolymer filmsUltraviolet spectroscopyCyclic voltammetry