Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 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.

PubMed Disclaimer

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

Similar articles

See all similar articles

Cited by

References

    1. Kalambate P.K., Huang Z., Li Y., Shen Y., Xie M., Huang Y., Srivastava A.K. Core@ shell nanomaterials based sensing devices: A review. TrAC Trends Anal. Chem. 2019;115:147–161. doi: 10.1016/j.trac.2019.04.002. - DOI
    1. Ghosh Chaudhuri R., Paria S. Core/shell nanoparticles: Classes, properties, synthesis mechanisms, characterization, and applications. Chem. Rev. 2012;112:2373–2433. doi: 10.1021/cr100449n. - DOI - PubMed
    1. Li J.-F., Zhang Y.-J., Ding S.-Y., Panneerselvam R., Tian Z.-Q. Core–shell nanoparticle-enhanced Raman spectroscopy. Chem. Rev. 2017;117:5002–5069. doi: 10.1021/acs.chemrev.6b00596. - DOI - PubMed
    1. Mahdavi Z., Rezvani H., Moraveji M.K. Core–shell nanoparticles used in drug delivery-microfluidics: A review. RSC Adv. 2020;10:18280–18295. doi: 10.1039/D0RA01032D. - DOI - PMC - PubMed
    1. Schärtl W. Current directions in core–shell nanoparticle design. Nanoscale. 2010;2:829–843. doi: 10.1039/c0nr00028k. - DOI - PubMed

MeSH terms

LinkOut - more resources