The key advantages of core–shell nanoparticles are enhanced levels of protection, encapsulation, and controlled release. Core–shell nanoparticles have distinct physiochemical traits and, thus, attract substantial research interests. They find a wide range of applicability in various fields, including biomedicine, electronics, optics, catalysis, and pharmaceuticals. Currently, many researchers have been investigating core–shell NPs with different functional compositions. Nanotechnology has developed rapidly in recent years, and consequently, core–shell nanoparticles (NPs) have emerged as the key functional material. For this reason, nanoparticles are often used to improve the pigment performance. For instance, some properties of magnetic nanocrystals (including blocking temperatures, permanent magnetization, and magnetic saturation) are determined by their particle size, whereas the coercivity of such a system is decided by their shape due to its impact on the surface anisotropy. It is important to note that the properties of these nanoparticles are both size- and shape-dependent. Some reports have indicated that it is relatively easier to make non-spherical nanoparticles than other shapes. Nonetheless, the preparation and characterization of differently shaped nanoparticles have only been performed recently. The development of new and advanced synthesis methods has enabled the production of symmetrical (spherical) and various other shaped nanoparticles (e.g., cube, prism, hexagon, wire, rod, and tube). Nanoscale systems are more advantageous than microscale, macroscale, and bulk materials because of their large surface area-to-volume ratios and quantum size effects. In essence, these nanoparticles can be considered as smart materials due to their distinctive properties. Nanoparticles are defined as particles with diameters below 0.1 µm, and such particles are attractive for diverse functional applications.
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