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).
Highlights
Nowadays applications of metallic nanoparticles (NPs) in different areas of science and technology are increasing
Both the center wavelength (CWL) and the full width at half maximum (FWHM) exhibit no significant dependence on the laser pulse energy, with variations of less than 0.5 and 11.2 %, respectively
Silver NPs capped with silica (Ag@Silica NPs) were synthesized by means of the pulsed laser ablation of a Si solid target immersed in H2O and the subsequent addition of a [AgNO3]
Summary
Nowadays applications of metallic nanoparticles (NPs) in different areas of science and technology are increasing. An important part of these studies has been focused on the surface plasmon resonance (SPR), which consists in a resonance coupling between the electromagnetic field frequency and the free electrons oscillation frequency on the metal NPs. When resonance conditions are matched, a strong absorption of the electromagnetic field energy is brought about by metallic NPs [2]. When resonance conditions are matched, a strong absorption of the electromagnetic field energy is brought about by metallic NPs [2] Thanks to these properties, Ag NPs have been widely used as biological labeling [3] and as antibacterial agents [4,5,6,7], among others [8, 9]. Different physical and chemical methods have been used to obtain NPs [10,11,12,13,14,15], among them is the laser ablation in liquid [16, 17]
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