ISSN 2347-3487 Volume 13 Number 2 Journal of Advances in Physics 4671 | Page March 2017 www.cirworld.com Green synthesis of mixed metallic nanoparticles using room temperature self-assembly A.M. Abdelghany 1* , A.H. Oraby 2 , Awatif A Hindi 3 , Doaa M El-Nagar 4 , Fathia S Alhakami 5 1 Spectroscopy Department, Physics Division, National Research Centre, 33 El-Behouth St., Dokki, 12311, Cairo, Egypt. 2 Physics Department, Faculty of Science, Mansoura University, Mansoura, 35516, Egypt 3 Faculty of Science, King Saud University, Riyadh, Saudi Arabia. 4 College of Girls for Science, Arts and Education, Ain Shams University, Cairo, Egypt. 5 Faculty of Science, Taiz University, Taiz, Yemen * E-mail: a.m_abdelghany@yahoo.com ABSTRACT Bimetallic nanoparticles of silver (Ag) and gold (Au) were synthesized at room temperature using Curcumin. Reduction process of silver and gold ions with different molar ratios leads to production of different nanostructures including alloys and core-shells. Produced nanoparticles were characterized simultaneously with FTIR, UV/vis. spectroscopy, transmission electron microscopy (TEM), and Energy-dispersive X-ray (EDAX). UV/vis. optical absorption spectra of as synthesized nanoparticles reveals presence of surface palsmon resonance (SPR) of both silver at (425 nm) and gold at (540 nm) with small shift and broadness of gold band after mixing with resucing and capping agent in natural extract which suggest presence of bimetallic nano structure (Au/Ag). FTIR and EDAX data approve the presence of bimetallic nano structure combined with curcumin extract. TEM micrographs shows that silver and gold can be synthesized separately in the form of nano particles using curcumin extract. Synthesis of gold nano particles in presence of silver effectively enhance and control formation of bi-metallic structure. Keywords Silver nanoparticles; gold nanoparticles; Bimetallic nanoparticles; X-ray diffraction; transmission electron microscopy; Bimetallic nanoparticles; Ag/Au; TEM; XRD; EDAX 1- INTRODUCTION During last decade green synthesis of metallic nanoparticles are of increasing interest while preparation of bimetallic or multi-metallic nanoparticles NPs usually involves formation of core/shell and/or alloy type structures that possess an improved physicochemical character compared with their monometallic counterparts [1, 2]. Bimetallic and tri-metallic NPs have industrial and scientific importance result from novel properties including optical, magnetic and electronic properties suitable for practical applications [3]. Bimetallic NPs usually synthesized by chemical reduction, templet synthesis, laser ablation and seed-mediated growth that characterized by a well dispersed pattern in presence of stabilizers and/or surfactant. Bimetallic nanoparticles known to exhibit higher potential than mono- metallic counterparts and evidenced to be an effective catalysts for selective oxidation of glucose to glouconates compared to enzymatic catalysis in addition to operation in a wide range of pHs [4-6]. A growing concerns devoted to green synthesis necessitate the enhancement of new and eco-friendly regimes. Recently, many distinct approaches have been reported for production of different size and shape NPs. [7]. Because of the inherent advantages such as eco-friendly and nontoxic, low cost and process simplicity biogenic approaches using phytochemicals using various plant bio-sources attract researcher's attention especially for Au containing Ag and Au NPs. [8]. Distrbiution modes of the two elements comprising the bimetallic nanoparticle (BNPs) define their structure since it can be oriented in random alloy, core-shell, cluster-in cluster or alloy with intermetallic compound. Many factors controlling size and shape of prepared nanoparticles in the form of mono or bimetallic NPs including preparation techniques and conditions of preparation (pH, temperature, pressure or surround). Monometallic nanoparticles (MNPs) can be shaped in different forms depending on application needed or method and condition of preparation. These shapes includes mainly spheres, cubes and rodes in addition to tetrahedrons, octahedron, truncated octahedrons, and even stars while combination of two or more metals in the nano form may results in much more opportunities in shape and structure due to mixed distribution of each metal and their various organization [9]. Medecinal plants are known to serve as a basic source of a variety of bioactive phytochemicals. These phytochemicals serve as reducing, caping and even stabilizing agent in bioreduction and stabilization of phytogenic nanoparticles with immense therapeutic properties. Among these plant, Curcumin a as a household remedy to many ailments and considered as a highly bioactive, nontoxic and potent agent found in turmeric [10,11]. Present work aims to introduce a new and simple route for preparation of mono and bimetallic nanoparticles using echo frindely method i.e. green synthesis with available plant extract of curcamine and extended for characterization of these NPs for possible use in various medical application and devoted mainly for breast cancer treatment.