Department of Bioscience and Biotechnology, Konkuk University, Seoul 05029, Korea.
Division of Science Education, Kangwon National University, Chuncheon 24341, Korea.
Int J Mol Sci. 2021 Nov 5;22(21):11983. doi: 10.3390/ijms222111983.
To study the distance-dependent electromagnetic field effects related to the enhancement and quenching mechanism of surface-enhanced Raman scattering (SERS) or fluorescence, it is essential to precisely control the distance from the surface of the metal nanoparticle (NP) to the target molecule by using a dielectric layer (e.g., SiO, TiO, and AlO). However, precisely controlling the thickness of this dielectric layer is challenging. Herein, we present a facile approach to control the thickness of the silica shell on silver nanoparticle-assembled silica nanocomposites, SiO@Ag NPs, by controlling the number of reacting SiO@Ag NPs and the silica precursor. Uniform silica shells with thicknesses in the range 5-40 nm were successfully fabricated. The proposed method for creating a homogeneous, precise, and fine silica coating on nanocomposites can potentially contribute to a comprehensive understanding of the distance-dependent electromagnetic field effects and optical properties of metal NPs.
为了研究与表面增强拉曼散射（SERS）或荧光增强和猝灭机制相关的距离依赖电磁场效应，通过使用介电层（例如 SiO、TiO 和 AlO）来精确控制金属纳米粒子（NP）表面与目标分子之间的距离至关重要。然而，精确控制介电层的厚度具有挑战性。在此，我们提出了一种通过控制反应的 SiO@Ag NPs 的数量和硅烷前驱体来控制银纳米粒子组装的二氧化硅纳米复合材料，SiO@Ag NPs 上的二氧化硅壳厚度的简便方法。成功制备了厚度在 5-40nm 范围内的均匀二氧化硅壳。在纳米复合材料上创建均匀、精确和精细的二氧化硅涂层的方法，有望有助于全面了解金属 NPs 的距离依赖电磁场效应和光学性质。
