International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Special Issue: 09 | Sep -2017 www.irjet.net p-ISSN: 2395-0072 One Day International Seminar on Materials Science & Technology (ISMST 2017) 4 th August 2017 Organized by Department of Physics, Mother Teresa Women’s University, Kodaikanal, Tamilnadu, India © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 127 Synthesis, Characterization and Electrical Conductivity Study of Conductive Polypyrrole doped with Nano Tin Composite for Antibacterial Application G. Sowmiya 1 , P. M. Anbarasan 2 , G. Velraj 3 1 Research Scholar, Department of Physics, Periyar University, Salem-636 011, Tamilnadu, India. 2 Professor, Department of Physics, Periyar University, Salem-636 011, Tamilnadu, India. 3 Associate Professor, Department of Physics, Anna University, Chennai-600 025, Tamilnadu, India. ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Polymer/metal nanocomposite consisting of polymer as matrix and metal nanoparticle as nanofiller generally give an idea about several attractive advantages such as structural, optical, mechanical and electrical characteristics. In the present study involves the synthesis of polypyrrole blended with nano tin particles via chemical oxidation polymerization method. The materials synthesized PPy & PPy/Sn composite were characterized by FT-IR spectroscopy, XRD (Powder X-ray diffraction), Field emission scanning electron microscope(FESEM), energy dispersive X-ray spectroscopy (EDX), electrical conductivity (Two probe method) and antibacterial acitvity studies. FT- IR analysis confirms the presence of nano tin particles in the molecular structure. XRD patterns revealed that the sample is crystalline nature with tetragonal structure. The average crystalline size for this PPy/Sn nanocomposite is found to be 35.68 nm. The electrical conductivity results indicate that the PPy/Sn nanocomposite was responsible for enhanced dielectric performance. The synthesized nanocomposite was also analyzed for antibacterial activity against Gram- positive and Gram-negative bacteria. The antibacterial study showed that the pure polypyrrole did not have a very good antibacterial activity but PPy/Sn nanocomposite is found to be effective against Gram-positive and Gram- negative bacteria. Key Words: PPy/Sn, FT-IR, XRD, FE-SEM with EDAX, electrical conductivity and antibacterial activity. 1. INTRODUCTION In recent years, conducting polymers such as polypyrrole, polythiophene and polyaniline have received much attention because of their potential applications in chemical and biological sensors, electronic devices, as well as efficient and low cost solar cells, due to their remarkable mechanical and electrical properties such as low operating temperature, low cost, flexibility and easy processability and so on [1–7]. In the current years, synthesis and application of conducting polymer nanocomposite with various inorganic nanoparticles such as TiO2[8], MnO2[9], Cu2O[10], ZnO[11] have been reported. The present paper reports the synthesis of polypyrrole nanocomposite by the incorporation of nano tin particles in the polypyrrole matrix. To achieve this goal, ppy and PPy/Sn have been synthesized by chemical oxidation polymerization method. These polymer hybrid nanocomposite have been characterized using various techniques. The structural properties were analyzed by FT-IR and XRD. The interaction of nano tin composite with the PPy has been visualized using FESEM analysis. The electrical conductivity measurement was studied using two probe techniques. Antibacterial activities of nanoparticles were tested against gram-positive; Staphylococcus aureus and gram-negative; Escherichia coli. 2. EXPERIMENTAL METHODS 2.1 Synthesis of Polypyrrole The Polypyrrole was prepared by using chemical oxidative polymerization method. H2SO4 is used as a dopant (K2Cr2O7) is used as an oxidant. The pyrrole monomer solution was stirred at ice temperature and the H2SO4 solution was added drop wise into this pyrrole monomer solution. The reaction mixture was stirred one hour at constant rpm value. The solution of 0.5 M of K2Cr2O7 was added drop wise into the mixture.This reaction mixture kept under the ice temperature and stirred constant RPM value at 24 hours continuously. The black precipitate was separated out by filtering. The final product was dried in Laboratory oven at 100˚C for 90 minutes. Finally the product was ground into fine powder using mortar and pestle. 2.2 Synthesis of Ppy/Sn Nanocomposite The 200mg of PPy powder was mixed with 100ml of distilled water and the mixture was added to 200mg of nano tin particle and stirred constant RPM value at 12 hrs