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Synthesis and characterization of structural, optical, thermal and dielectric properties of polyaniline/CoFe2O4 nanocomposites with special reference to photocatalytic activity

2013; Elsevier BV; Volume: 109; Linguagem: Inglês

10.1016/j.saa.2013.03.011

1873-3557

Javed Alam Khan, Mohd Qasim, Braj Raj Singh, Sneha Singh, Mohd Shoeb, Wasi Khan, Dibakar Das, Alim H. Naqvi,

Polymer Nanocomposite Synthesis and Irradiation

In this study we have synthesized polyaniline/CoFe2O4 nanocomposites ([email protected]) by in situ polymerization method with different amounts of the CoFe2O4 nanoparticles NPs (CF–NPs) (0.5 g and 1.0 g). The structural optical, thermal and dielectric properties of the as synthesized [email protected] were studied. The XRD analysis ensures that CF–NPs have a single phase spinel structure. The XRD and EDAX results confirmed that the CF-NPs were successfully incorporated in the PANI matrix. The crystalline size analysis revealed that the size increased with increasing CF–NPs amount in the [email protected], because of the aggregation effect. TGA exhibited an enhanced thermal stability of the [email protected] as compare with PANI owing to the strong interaction between the CF–NPs and polymer matrix. The energy band gaps as calculated through the Tauc relation were found to be gradually higher with the increasing the amount of CF–NPs in [email protected] The dielectric constants (ε′, ε″), dielectric loss (tan δ) and AC conductivity (σac) were studied as the function of frequency and composition, which have been explained by 'Maxwell Wagner Model'. The high dielectric constant and ac conductivity were observed of [email protected] than PANI. Moreover, [email protected] 1:2 exhibited the promising photocatalytic activity for the photo-decoloration of the methyl orange (MO) dye under UV light irradiation. Results also showed protection of photo-decoloration of the MO dye by the disodium ethylenediaminetetraacetate dehydrate (EDTA-Na2; C10H14N2Na2O8⋅2H2O) (hole scavenger) and tert-butyl alcohol (C4H10O) (radical scavenger) clearly suggested the implication of reactive oxygen species (ROS) in the photocatalytic activity of [email protected] 1:2. It is encouraging to conclude that [email protected] bears the potential of its applications in photocatalysis.