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. 2021 Nov 5;22(21):11983.
doi: 10.3390/ijms222111983.

Ultra-Fine Control of Silica Shell Thickness on Silver Nanoparticle-Assembled Structures

Eunil Hahm  1 , Ahla Jo  1 , Eun Ji Kang  1 , Sungje Bock  1 , Xuan-Hung Pham  1 , Hyejin Chang  2 , Bong-Hyun Jun  1
Affiliations

Ultra-Fine Control of Silica Shell Thickness on Silver Nanoparticle-Assembled Structures

Eunil Hahm et al. Int J Mol Sci. .

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.

Keywords: assembled structures; fine control; shell thickness; silica shell.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
TEM images of the synthesized (a) SiO2 NPs and (b) SiO2@Ag NPs.
Figure 2
Figure 2
(A) TEM images at (i) low and (ii, iii) high magnifications. (B) The thickness of the silica shell layer on the surface of the SiO2@Ag NPs synthesized under various conditions (a–f).
See this image and copyright information in PMC

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