Joy, Lija K.Sooraj, V.Sajeev, U.S.Nair, Swapna S.Narayanan, T.N.Sethulakshmi, N.Ajayan, P.M.Anantharaman, M.R.2014-04-142014-04-142014Joy, Lija K., Sooraj, V., Sajeev, U.S., et al.. "Large enhanced dielectric permittivity in polyaniline passivated core-shell nano magnetic iron oxide by plasma polymerization." <i>Applied Physics Letters,</i> 104, (2014) AIP Publishing: 121603. http://dx.doi.org/10.1063/1.4870098.https://hdl.handle.net/1911/75889Commercial samples of Magnetite with size ranging from 25-30nm were coated with polyaniline by using radio frequency plasma polymerization to achieve a core shell structure of magnetic nanoparticle (core)-Polyaniline (shell). High resolution transmission electron microscopy images confirm the core shell architecture of polyaniline coated iron oxide. The dielectric properties of the material were studied before and after plasma treatment. The polymer coated magnetite particles exhibited a large dielectric permittivity with respect to uncoated samples. The dielectric behavior was modeled using a Maxwell-Wagner capacitor model. A plausible mechanism for the enhancement of dielectric permittivity is proposed.engArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.Journal articlehttp://dx.doi.org/10.1063/1.4870098