Synthesis and Characterization of Ni@Co and Co@Ni Core-Shell Nanoparticles via Laser Ablation

Abstract

This work aimed to study the synthesis and characterization of nickel (Ni) and cobalt (Co) nanoparticles, as well as (Co@Ni) and (Ni@Co) core-shell nanoparticles. Pulsed laser ablation in liquid (PLAL) technique using Nd:YAG laser at wavelength (1064 nm) was used in the synthesis in deionized water, and important structural and optical characterization techniques were used to characterize them. The results showed superior optical and structural properties of the core-shell nanoparticles compared to those synthesized individually, as their optical properties are more stable with larger energy gap values, where it has smaller crystal sizes, and their morphological analysis shows that they are more regular and have smaller average diameters. The results also showed the formation of metal oxide nanoparticles in all the prepared colloidal nanoparticles.