Indian Journal of Natural Sciences www.tnsroindia.org.in ©IJONS Vol.8 / Issue 47 / April 2018 International Bimonthly ISSN: 0976 – 0997 13591 Study on Au -Ni Core-Shell Nanowires for Optical Applications Sameer Nawaf *, Jamal M. Rzaij and Moaaed Motlak Department of Physics, University of Anbar, Ramadi 30001, Iraq. Received: 13 Feb 2018 Revised: 23 Feb 2018 Accepted: 31 Mar 2018 * Address for correspondence Sameer Nawaf Department of Physics, University of Anbar, Ramadi 30001, Iraq. E mail: samir_an82@yahoo.com This is an Open Access Journal /article distributed under the terms of the Creative Commons Attribution License (CC BY-NC-ND 3.0) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. All rights reserved. The optical properties of Au-Ni core-shell nanowire were simulated using the Mie-Lorentz scattering approach. The simulation fixed the core diameter of Au at approximately 20nm and the thickness of the Ni shell at 20nm. The optical absorbance spectrum, optical transmittance spectrum, absorption coefficient and the optical energy gap of Au and Au-Ni coaxial nanowire as a function of wavelength were calculated. The study reveals an excellent enhancement in the values of optical absorbance spectrum and absorption coefficient for Au-Ni core-shell nanowires compared to Au nanowires. The results of energy gap calculations demonstrated that Au-Ni core-shell nanowires have an optical application as ultra-violet photo-detectors. Keywords: Mie scattering, Absorption efficiency, optical transmittance spectrum, Au-Ni core-shell nanowires INTRODUCTION A nanowire can be defined as a nanostructure with a diameter in the order of a nanometer [1]. Also, it is known as a structure that has a thickness of tens of nanometers with an unconstrained length. The study of semiconductor nanowires has developed rapidly over the last few years. Various types of nanowire have been utilized in novel scientific applications [2–6]. In the last decades, an advanced application of gold nanostructures has emerged [7]. As a result of its extraordinary properties, such as low reactivity and malleability, gold occupies a special position in electrochemical analyses [8]. Although gold is a distinguished bulk material, various surprises appear when one considers the nanoscale structures. For example, in the transition from gold crystalline (fcc) to nanowires, there appears a remarkable organization of matter [9]. Gold nanowires (Au NWs) are a key research subject in the field of nanotechnology due to their unique physical properties and potential applications in nano-photonic devices and sensors [10,11]. To investigate the photonic applications of Au-core/Ni-shell NWs, optical properties of both Au NW and Au-core/Ni-shell NWs were calculated. A nanowire-based core/shell structure is used in this work to combine the advantages of Au and the Ni materials and thus to improve the performance of the pattern. Optical properties play an important role in the study of the synthesis of semiconductor materials. The optical properties investigated ABSTRACT RESEARCH ARTICLE