Dielectric and magnetic properties of conducting ferromagnetic composite of polyaniline with γ-Fe2O.pdf

Materials Chemistry and Physics 112 (2008) 651–658 Contents lists available at ScienceDirect Materials Chemistry and Physics j o u rn al h omepage: www.elsevi er.c om /locate/matchemp h ys Dielectric and magnetic properties of conducting ferromagnetic composite of polyaniline with -Fe2O3 nanoparticles Kuldeep Singh a , Anil Ohlan a , R.K. Kotnala b , A.K. Bakhshi c , S.K. Dhawan a,∗ a Polymeric Soft Materials Section, National Physical Laboratory, New Delhi 110012, India b Magnetic Standards, National Physical Laboratory, New Delhi 110012, India c Department of Chemistry, University of Delhi, Delhi 110007, India a r t i c l e i n f o a b s t r a c t Article history: The present paper reports the synthesis of conducting polyaniline polymer composite with nanoclus- Received 22 February 2008 ters of ferrite (-Fe2 O3 ) particles in the presence of dodecylbenzene sulfonic acid in aqueous medium Received in revised form 1 May 2008 through electrochemical and chemical oxidative polymerization. Different formulations have been pre- Accepted 8 June 2008 pared to study the effect of ferrite constituent on the electrical and dielectric properties of polyaniline nano-composite. Vibrating sample magnetometer (VSM) studies and electrical conductivity measure- Keywords: ments have revealed that conducting polymer composite has a saturation magnetization (Ms ) value of Electrochemical technique −1