Synthesis of Ag@Silica Nanoparticles by Assisted Laser Ablation

Abstract

This paper reports the synthesis of silver nanoparticles coated with porous silica (Ag@Silica NPs) using an assisted laser ablation method. This method is a chemical synthesis where one of the reagents (the reducer agent) is introduced in nanometer form by laser ablation of a solid target submerged in an aqueous solution. In a first step, a silicon wafer immersed in water solution was laser ablated for several minutes. Subsequently, an AgNO3 aliquot was added to the aqueous solution. The redox reaction between the silver ions and ablation products leads to a colloidal suspension of core-shell Ag@Silica NPs. The influence of the laser pulse energy, laser wavelength, ablation time, and Ag+ concentration on the size and optical properties of the Ag@Silica NPs was investigated. Furthermore, the colloidal suspensions were studied by UV–VIS-NIR spectroscopy, X-Ray diffraction, and high-resolution transmission electron microscopy (HRTEM).

SERS active Ag–SiO2 nanoparticles obtained by laser ablation of silver in colloidal silica

“…Silica nanoparticles in an aqueous suspension are known to be inert and dispersible – properties which can be quite useful in the preparation of colloidal nanocomposites with silver. For this reason, there are a significant number of studies in the literature on colloidal substrates formed with silica and silver, especially in recent years [ 1 – 14 ], which have found various applications in medicine, catalysis and environmental research. In this regard, it is important to remark that silica is an inert and optically transparent material.…”

Synthesis of gold–silica core–shell nanoparticles by pulsed laser ablation in liquid and their physico-chemical properties towards photothermal cancer therapy

“…Previous work on the fabrication of silicate coated noble metal NPs via PLAL used noble metal salts dissolved in the liquid and silica as the target. 67,68 Trace amounts of these salts may have toxic effects.…”

Advances in Laser Ablation Synthesized Silicon-Based Nanomaterials for the Prevention of Bacterial Infection

“…Therefore, the effect of the solvent on the synthesis of silicon-based nanomaterials by laser ablation has been extensively studied ( Figure 3 ). Distilled or deionized water is cheap, safe, does not absorb the light of the laser and have high heat capacity [ 66 ], reasons that make it the most widely used liquid medium for the synthesis of silicon-based nanomaterials by laser ablation [ 46 , 59 , 67 , 68 , 69 ]. When the synthesis takes place in an aqueous medium, the dissolved oxygen or the laser-induced decomposition products of the water can interact with the substrate giving rise to various species of oxide or hydroxide.…”