IOSR Journal of Applied Physics (IOSR-JAP) e-ISSN: 2278-4861.Volume 10, Issue 3 Ver. II (May. – June. 2018), PP 73-83 www.iosrjournals.org DOI: 10.9790/4861-1003027383 www.iosrjournals.org 73 | Page Synthesis Of NiO Doped ZnO/MWCNT Nanocomposite And Its Charecterization For Photocatalytic & Antimicrobial Applications D. Saravanakkumar 1,* , R. Karthika 2 , S. Ganasaravanan 3 , S. Sivaranjani 4 , S.Pandiarajan 2 , B. Ravikumar 2 , A. Ayeshamariam 3* 1,* Research and Development Centre, Bharathiyar University, Coimbatore, 641046, Tamilnadu, India 2 Department of Physics, Devanga Arts College (Autonomous), Aruppukottai, 626101, Tamilnadu, India 1,3,* Department of Physics, Khadir Mohideen College, Adirampattinam – 614 701, Tamilnadu, India 4 Department of Physics, SBM College of Engineering and Technology, Dindigul- 624 005, Tamilnadu, India * Corresponding Authors: D. Saravanakkumar, A. Ayeshamariam Abstract:The field of Bionanoscience is one of the vibrant research area in smart materials, antimicrobial activity and drug delivery system. Cost effective method of simple pyrolysis treated synthesis of nanoparticles is the present research in branch of nanobioscience. The NiO doped nanocomposite synthesized simply have been widely used in the anti microbial techniques and waste water management. In this research article we present a simple and cost effective method synthesis of NiO doped ZnO/MWCNT nanocomposite. This composite were structurally and morphologicaly charecterized by Powder X-Ray Diffraction (PXRD) and Field Emission Scanning Electron Microscope (FESEM). It was optically chrecterized by the Ultra-Violet Visible (UV-Vis) spectroscopy and Fourier Transform Infra-Red (FTIR) spectroscopy. Further these charecterized by Energy Dispersive X-Ray spectroscopy for percentage of elemental compositions. Moreover these synthesized nanocomposite was found to be very effective antibacterial agens against Staphylococcus aureus and pseudomonas aeruginosa and also effective antifungal candidates for Aspergillus nigerand Candida albicans for various quantities in μL. Finally it was to be a good photocatalytic behavior material for photodegradation when interact with Methyl Orange (MO) dye by separating electron hole pair effectively. Keywords: Nanocomposites, XRD, FESEM, Antibacterial, antifungal and Photocatalytic . --------------------------------------------------------------------------------------------------------------------------------------- Date of Submission: 29-05-2018 Date of acceptance: 14-06-2018 --------------------------------------------------------------------------------------------------------------------------------------- I. Introduction ZnO nanoparticles (NPs) have high photosensitivity, photocatalytic activity, quantum efficiency, non- toxicity and low cost. Its extraordinary structural benefits further extends their applications tochemical sensors, transparent conductor, gas sensors, varistors, solar cells, light-emitting diodes, surface acoustic wave filters, photonic crystals, photodetectors, photodiodes and optical modulator waveguides. These applications are due to their wide bandgap (3.37 eV), energy (60 meV), excellent chemical stability and thermal stability [1-6]. Among various p-type oxides, nickel oxide (NiO) is a highly active material with wide band gap (3.6 eV to 4.0 eV) and extensively studied for various applications such as catalysis, gas sensing, battery cathodes, magnetic materials, electrochromic films, chemical sensors and photovoltaic devices. MWCNTs have a highly porous and hollow structure, large specific surface area, significant electronic and conductive properties and a versatile surface that can be modified to improve adsorption properties. The fabrications of ZnO/multi-walled carbon nanotube (MWCNT) nanocomposites have gained interest among the materials because of its superior optoelectronic properties, photocatalyticproperties and their antibacterial activities. Since there has been an increase in the number of diseases due to bacterial transmission either by interpersonal or through contaminated surfaces ZnO, NiO and CNT particles are a less toxic and inhibtion properies against harmful bacterias which causes disease in humen body. Microorganisms such as Escherichia coli and Staphylococcus epidermis are bacterial pathogens in hospital environments that could be acquired even from an inanimate object [7-10].Many synthesis techniques are available in preperation of metal oxide and MWCNTnanocomposite powder. Among them, some methods are cumbution method, sol- gel method, sol-gel cumbution method, coprecipetation method, modified silar method, conventional spray pyrolysis method and soft chemical root method. Simplifed Spray Pyrolysis (SSP) method is one of the cost effective method for synthesising a metaloxide nanopowder with excellent polycrystallinitty nature [11-14]. In the present work, NiO doped ZnO/MWCNT (NiO:ZnO/MWCNT) nanocomposite powder were synthesised by SSP method and their structural, optical and antibacterial effects were investigated [15-19]. The sample were characterised by powder X-ray diffraction (XRD), Fourier Transform Infraredspectroscopy (FTIR),