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- Title
Ultra-Fine Control of Silica Shell Thickness on Silver Nanoparticle-Assembled Structures.
- Authors
Hahm, Eunil; Jo, Ahla; Kang, Eun Ji; Bock, Sungje; Pham, Xuan-Hung; Chang, Hyejin; Jun, Bong-Hyun
- Abstract
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., SiO2, TiO2, and Al2O3). 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, SiO2@Ag NPs, by controlling the number of reacting SiO2@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.
- Subjects
SERS spectroscopy; SILICA; INDUCTIVE effect; SILICA nanoparticles; ELECTROMAGNETIC fields; METAL nanoparticles; SILVER
- Publication
International Journal of Molecular Sciences, 2021, Vol 22, Issue 21, p11983
- ISSN
1661-6596
- Publication type
Article
- DOI
10.3390/ijms222111983