International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 05 | May -2017
p-ISSN: 2395-0072
www.irjet.net
Comparison of the nanostructure obtained by annealing on conductive metals copper and aluminum at same temperature and same annealing time Swati Srivastava1, Er. Anurag Srivastava2 1M.Tech SRIMT Affilated to Dr. APJ Kalam University Lucknow Anurag Srivastava HOD SRIMT Dept of Mechanical engg LUCKNOW ---------------------------------------------------------------------***--------------------------------------------------------------------2Er.
Abstract - Detailed structural and optical characterizations confirmed that the as-grown nanostructures were highly crystalline, possessed a wurtzite hexagonal phase, had grown along the c-axis direction and exhibited excellent optical properties. Moreover, the fabricated FETs show a high conductivity ON/OFF ratio of aboutâˆź102 with ultraviolet (UV) light and hence provide an effective way to use these devices in nanoscale UV detectors and optoelectronic switches. Morphology and microstructure of the nanowires was studied as a function of temperature and annealing time using scanning electron microscopy and EDAX- techniques . The structure and morphology of thin aluminium-oxide and copper oxide films grown by the dry, thermal oxidation of a bare Al and Cu substrate in the temperature range of 773 K were studied using Xray photo electron spectroscopy and high resolution electron microscopy. The microstructure and phase constituents of these metals were studied by metallography , FESEM and EDX Techniques. In this paper, we investigate the oxidation behaviour of copper and aluminium at temperatures 500o C for 4 hours and its mechanism. The oxides formed after oxidation at low temperatures have different crystal structures . The presence of such an oxidation layer slows down the oxidation rate constants by an order of magnitude. This study demonstrates the oxidation of copper at low temperature and aluminium at high temperature are controlled by the grain boundary diffusion. Increasing the crystal size in the surface oxide reduces the oxidation rate significantly Key Words: Nano Structures, FESEM and EDX Technique 1.INTRODUCTION
Strong materials are a classical goal for materials research and development. Today there is focus on nanostructured metals since they are found to have a very high strength as well as other excellent mechanical properties . Nanostructured metals can be processed by a number of different techniques and can be found by different techniques 1.1 Sample preparation Copper and aluminium samples were prepared in the size of(9X9X1mm3) and (10X10X2mm3) respectively by the use of hacksaw cutter and filler blade. After preparing samples of require size copper sheet and aluminium sheet was first cleaned in dilute nitric acid to remove the native oxide layer and adsorbed impurities. The foil was then thoroughly rinsed with distilled water followed by filter paper for soaking liquid. Thermal oxidation of Cu and Al sheet were carried out in a resistively heated furnace at same temperature 500o C and times under flowing oxygen atmosphere. In all the experiments, the rate of heating of copper and aluminium sheet was maintained at 20 C/sec and after oxidation, samples were quenched by removing from furnace. An atmospheric air flow rate was maintained during the complete cycle of heating, oxidation and quenching of the samples. Surface morphology of the samples was studied using a field emission scanning electron microscope (FESEM). FESEM micrographs of CuO and Al 2O3 nanowires prepared by annealing copper strips for 4 h and 15 minutes under atmospheric air at 500o C. Length and diameter of CuO and Al2O3 structures were measured from SEM images. Chemical composition of the structures was confirmed by recording Energy dispersive X-ray analysis (EDX) spectrum. RESULT
A nanostructure is a structure of intermediate size between microscopic and molecular structures. Nano structural detail is microstructure at nanoscale. A method is provided for improving metallic nanostructure stability. The metallic nanostructures are annealed in an atmosphere oxygen. The annealing temperature is less than the melting temperature the metal material in bulk form. In response to the annealing, stabilized metallic nanostructures are formed. If the stabilized metallic nanostructures are exposed to an ambient air environment the stabilized metallic nanostructure maintain the first diameter. Š 2017, IRJET
|
Impact Factor value: 5.181
|
The result is divided into two parts 1. Fesem microstructure 2. EDX image
ISO 9001:2008 Certified Journal
|
Page 1042