Synthesis and Structural Characterization of Cobalt Nanostructures in AAO Membranes

Gabriela Calin,Roxana Trusca,Felicia Iacomi,Geta Mitrea,Constantin Marcu,Eugeniu Vasile,Alexandra Burlui

doi:10.37358/rc.19.9.7568

Abstract

Metallic nanostructures have attracted the interest of researchers due to their fundamental importance and potential applications in nanodevices, sensors and catalysts. Co-AAO nanocomposites were obtained by using a sol-gel method that uses ultrasonic vibrations to induce the penetration of a colloidal solution through the pores of an anodized aluminum oxide (AAO) template. The AAO template, with the sol into its pores, was annealed at 648 K. The entire dip-anneal-dip�process was repeated three times. Finally, the metal nanostructures were formed by further annealing at 873 K in hydrogen atmosphere for 1 h. The morphology and structure of Co-AAO were investigated by using SEM, HRTEM, XRD and EPR methods.

Highlights

The recent theoretical studies and experimental techniques led to the discovery of new materials, processes and phenomena at nanoscale sizes
A low-cost technique for fabrication of metallic nanostructure arrays is the deposition of nanodots, nanowires, nanorods, nanotubes or nanocylinders in selfassembled anodized aluminum oxide membrane (AAO) from colloidal solutions or electrodeposition [7,8,9,10,11,12,13]
The present study is focused on the synthesis of cobalt nanostructures using aluminum oxide template (AAO) and on their structural characterization by using scanning electron microscopy (SEM), high resolution electron microscopy (HRTEM, EDX), X-ray diffraction (XRD) and electron paramagnetic spectroscopy (EPR)

Summary

Introduction

The recent theoretical studies and experimental techniques led to the discovery of new materials, processes and phenomena at nanoscale sizes. It was experimentally observed that Co wires with small diameters (20 nm) have an isotropic saturation (same value with the field parallel or perpendicular to the wires) and was concluded that the magnetization behavior is a result of a competition of demagnetization of the individual wires and dipole–dipole interaction between the wires. The present study is focused on the synthesis of cobalt nanostructures using aluminum oxide template (AAO) and on their structural characterization by using scanning electron microscopy (SEM), high resolution electron microscopy (HRTEM, EDX), X-ray diffraction (XRD) and electron paramagnetic spectroscopy (EPR).

Results

Conclusion