González-Castillo J R, Rodriguez E, Jimenez-Villar E, Rodríguez D, Salomon-García I, de Sá Gilberto F, García-Fernández T, Almeida D B, Cesar C L, Johnes R, Ibarra Juana C
Instituto Politécnico Nacional, CICATA U. Altamira, Altamira, CP 89600, México.
Universidade Federal de Pernambuco, DQF, Recife, CP 50670-901, Brazil.
Nanoscale Res Lett. 2015 Dec;10(1):399. doi: 10.1186/s11671-015-1105-y. Epub 2015 Oct 13.
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).
本文报道了采用辅助激光烧蚀法合成多孔二氧化硅包覆的银纳米颗粒（Ag@二氧化硅纳米颗粒）。该方法是一种化学合成方法，其中一种试剂（还原剂）通过对浸没在水溶液中的固体靶材进行激光烧蚀以纳米形式引入。第一步，将浸入水溶液中的硅片进行激光烧蚀几分钟。随后，将一份硝酸银加入到水溶液中。银离子与烧蚀产物之间的氧化还原反应导致核壳型Ag@二氧化硅纳米颗粒的胶体悬浮液。研究了激光脉冲能量、激光波长、烧蚀时间和银离子浓度对Ag@二氧化硅纳米颗粒尺寸和光学性质的影响。此外，通过紫外-可见-近红外光谱、X射线衍射和高分辨率透射电子显微镜（HRTEM）对胶体悬浮液进行了研究。
