IJSRST1845472 | Received : 05 April 2018 | Accepted : 23 April 2018 | March-April-2018 [ (4) 5 : 1636-1640] © 2018 IJSRST | Volume 4 | Issue 5 | Print ISSN: 2395-6011 | Online ISSN: 2395-602X Themed Section: Science and Technology 1636 Green Synthesis and Characterization of ZnO- Ag Nanocomposite by Thymus vulgaris Mina Zare 1,2 , K. Namratha 1,2 , K.Byrappa 1,2 * 1 DOS in Earth Science, Mansagangothri, University of Mysore, Mysore, India 2 Centre for Materials Science and Technology, Vijnana Bhavana, University of Mysore, Mysore, India *Corresponding author: kbyrappa@gmail.com ABSTRACT In this study, ZnO-Ag nanocomposite (NCs) was synthesized less than 20 nm through a simple and eco-friendly bio-hydrothermal method by using aqueous Thymus vulgaris (Thyme) leaf extract. Thyme leaf extract was used as a reducing agent and surfactant in the green synthesis of ZnO-Ag NCs. Crystal structure, Functional group, morphology, chemical elemental, the band gap of ZnO-Ag NCs were characterized by using powder X-ray diffraction, Fourier Transform Infrared Spectroscopy, Transmission Electron Microscopy, Energy Dispersive X- ray analysis, UV-visible spectroscopy, respectively. TEM results confirmed the size and morphology of nanocomposite. The influence of silver nitrate concentration in the formation of ZnO-Ag NCs was studied. This study future aims that to use biocompatible ZnO-Ag nanocomposite for biological application and food packaging. Keywords: Hydrothermal synthesis, Thyme leaf extract, ZnO-Ag Nanocomposite, Characterization I. INTRODUCTION Metal and metal oxide nanoparticles are interesting because of their great optical, chemical, electrical and magnetic properties [1]. These properties bring the materials interesting in different application areas, including nanoelectronics devices, catalysis, nonlinear optical devices, bio-medical, etc [2]. Metal oxides semiconductor nanocomposites have been widely explored due to their potential applications in various fields [3]. Between metal and metal oxides, Ag and ZnO nanoparticles have attracted large attention, not only because ZnO has great chemical stability, low cast, large surface area and wide-band gap with various applications, including use in electronics, solar cells, photo electronics and sensors, but also because Ag nanomaterials illustrate some unique features in biological and chemical sensing and high electrical conductivity. Additionally, Ag modification is found to be effective for the synthesis of p-type ZnO, as the naturally occurring ZnO demonstrations n-type conductivity as a result of its innate defects such as oxygen vacancies and zinc interstitials [4] . Recently, Ag ions become more attracts of the several research works, due to their novel effects on the evolution of antibacterial activity and efficiency of photo catalytic activity of semiconductor [5]. On the other hand, recently zinc oxide nanoparticles has received much consideration due to it has a vast range of attributes that depend on doping, with a range of conductivity from metallic to