1. Intensity (a.u.) 2 Figure 4: Vibration sampling magnetometery curves various content of Fe 3 O 4 nanoparticle, PPY/CHI and PPY Figure 3 : Electical conductivity of PPY/CHI/ Fe 3 O 4 at various % Fe 3 O 4 nanoparticle contents. Jamileh Amin 1, Anuar Kassim 1, Zainal Abidin Talib 2, Mohamad Zaki Ab. Rahman 1, H.N.M. Ekramul Mahmud 3 1 Department of Chemistry, University Putra Malaysia, 43400 UPM Serdang, Malaysia 2 Department of Physic, University Putra Malaysia, 43400 UPM Serdang, Malaysia 3 Faculty of Science,University of Malaya, Kuala Lumpur,Malaysia,50603 Preparation and Characterization of Polypyrrole – Chitosan – Fe 3 O 4 Magnetic Nanocomposite by In-Situ Chemical Oxidative Polymerization Nowadays, the synthesis and characterization of magnetic conducting polymer nanocomposites has attracted significant attention due to their potential in a vast range of applications in sensors, electrical–magnetic shields and electrochemical displays and even in biomedicine. Chitosan is a novel biocompatible steric stabilizer to prepare surface functionalized conducting nanoparticles to prevent the aggregation of polyaniline, polypyrrole and others. The objectives and scopes of our work are preparation and characterization of magnetic conductive polymer nanocomposite based on in-situ chemical polymerization. PPY/CHI/Fe 3 O 4 nanocomposite was synthesized by in-situ chemical oxidative polymerization. The structure and properties of PPY/CHI/Fe 3 O 4 nanocomposite were investigated by four-probe techniques, FT-IR, XRD, VSM, FTIR and XRD results confirmed the present of Fe 3 O 4, PPY and CHI. XRD shows that the present of Fe 3 O 4 nanoparticles with cubic spinal structure in the nanocomposite.[ICSD 01-075-0033].The PPY/CHI and PPY/CHI/ Fe 3 o 4 shows broad peak around 25-28 (2) proved the existence of polypyrrole conducting polymer. Figure 1 XRD curves of Fe 3 O 4 nanoparticle, PPY/CHI and PPY/CHI/ Fe 3 O 4 Figure 2: TEM micrograph of nanocomposite (PPY/CHI / Fe 3 O 4 ) By increasing Fe 3 O 4 content up to 15 wt.%, the magnetic properties increased (Magnetization reached to 5.9679 emu/g), the conductivity first increased, and then decreased. The optimum electrical conductivity measured was about 4.17 Scm -1 in nanocomposite prepared from 0.3 M pyrrole, 0.1% chitosan and 3% Fe 3 O 4 nanopartcle. A core-shell structure consisting of Fe 3 O 4 nanoparticle is confirmed by TEM. TEM reveals Fe 3 O 4 NP cover by PPY/CHI layer with average diameter of 107 -150 nm. ( the size of Fe 3 O 4 nanoparticle is > 50 nm ) Some Applications Abdi M.M.,Anuar Kassim (2009)Journal of Materials Science,44:3682 Chung,D.L. (2001) Carbon, 39(2), 279-85 Geetha S. et.al. (2006) Analytica Chimica Acta, Review 568, 119-125 Joon-Boo Yu, et.al. (2005) Sensors and Actuators (B) 108 305-308 kim,S.H.et.al. (2003), J. Applied Polymer Science 87(12), 1969-1974 Marie, E.et.al.(2002),. Biomacromolecules 3, 475-485 Stejskal, J. (2001) J. Polymer Materials. 18, 225-258 Yang,S.C. et.al.(2000) Colloid and Polymer Science 278, 285-292 We would like to express our gratitute to University Putra Malaysia, Selangor, Serdang-Malaysia for the support of this work. Polypyrrole/Chitosan/ Ferric oxide nanocomposite, PPY/CHI/Fe 3 O 4, with good electrical and magnetic properties was successfully prepared by in-situ chemical oxidative polymerization in the presence of Fe 3 O 4 nanoparticles under simultaneously sonication and mechanical stirrer. FT-IR and XRD revealed an interaction between Fe 3 O 4, PPY and CHI. TEM showed that nearly all Fe 3 O 4 nanoparticles are covered by PPY/CHI. By increasing Fe 3 O 4 content from zero to 15 wt.%, the magnetic properties increase and the conductivity first increases, and then decreases. The conductivity reached a maximum level at 3 wt.% Fe 3 O 4 content. Chitosan (88% local)/Acetic Acid ( 1-10% (W/V )) - (Overnight ) Chitosan (88% local)/Acetic Acid ( 1-10% (W/V )) - (Overnight ) Pyrrole monomer (Acros organic) (0.1-0.5 Molar) CHT/PY mixture (in Acetic Acid) mechanically stirred and sonication for 15 min Polymerization Centrifuge ( black powder) Washing with Water/Aceton Dry in 70 ° C for 24 hours Fe 3 O 4 NP (ALDRICH) (1%-15% (w/w) ) - sonicated in Acetic Acid for 30 min Stirred to hamogen FeCl 3. 6H 2 O added dropwise Drug Delivery Electromagnetic Shielding Effect Sensors & Biosensors Rechargeable Batteries Water and waste water Treatment 5.9679 emu/g Tel : + 603-8946-6779 4.17 Scm -1 Email: Corresponding Authors: anuar@science.upm.edu.my & jaamin2000@yahoo.com anuar@science.upm.edu.my