Microwave‐Assisted Synthesis of Core–Shell Nanoparticles—Insights into the Growth of Different Geometries

Abstract

Microwave irradiation is utilized for the rapid synthesis of gold–silver core–shell bimetallic nanoparticles (NPs) in a two‐step process. A strategy of establishing a bilayer organic barrier around the core using citrate and ascorbic acid as capping agents, providing a means to achieve a well‐defined boundary layer between the core and the shell material, is reported. These boundary layers are essential for synthesizing different core–shell morphologies and the approach results in tunable bimetallic NPs with defined core–shell structures, both for spherical as well as for triangular seed cores. In addition, theoretical calculations of the plasmonic characteristics based on the boundary element method of different classes of NPs are conducted. These investigations enable conclusions to be drawn on the influence of the core morphology on the tunability of their localized surface plasmon resonances.

Nanostructures in Biosensors: Development and Applications

“…Metal-based structures at the nanoscale are used in many fields due to their functionability, catalytic and electrical properties, surface plasmon resonance behavior, charge conduction, and sensing properties, and these properties provide unique advantages, especially for biosensor applications. Core@shell nanomaterials have been successfully synthesized by different methods, such as the hydrothermal method [31], sonochemical method [32], microwave irradiation [33], laser ablation [34] etc. In 2022, Mallick et al highlighted the requirement of metal@metal oxide (M@MO) core@shell nanoparticles (NPs) with chemical, physical properties, and unique morphologies at the nanoscale in high-performance biosensor applications [35].…”

Synthesis and potential applications of trimetallic nanostructures

“…86 The MW technique is important in the production of quality nanomaterials by reducing side reactions, toxic organic solvents, and chemicals with controlled reaction parameters. 87 The MW irradiation method was reported for the synthesis of Au/Pd/Pt colloidal nanocomposites. The BMN Au/Ag was arranged in the core and Pt was the shell with L-cysteine attached to the metals via its thiol group (Fig.…”

Core–shell TiO2−x-CuyO microspheres for photogeneration of cyclic carbonates under simulated sunlight

“…22,23 Recently, microwave-assisted synthesis of core-shell materials is gaining attention owing to the rapid and versatility of microwave approach. 24 Using the two-step process of solvothermal followed by microwave treatment, the fabricated core-shell metal oxide microspheres exhibited porous structure attributing to the self-assembled TiO 2−x nanoparticles. When the Cu y O shell layer was incorporated, each TiO 2−x nanoparticle was evenly coated, resulting efficient charge transfer for enhanced photogeneration of propylene carbonates even at mild conditions compared to that of industrial.…”