2017
DOI: 10.1021/acs.jpcc.7b00933
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Fabrication of Monodispersed Au@SiO2 Nanoparticles with Highly Stable Silica Layers by Ultrasound-Assisted Stöber Method

Abstract: Metal@dielectric composite nanostructures are of high demand for their vast technological applications. The Stöber method, either in its original form or by modification, has been utilized for the fabrication of silica shells over metal, semiconductor, or even dielectric nanostructures, with the aim to protect them from degradation, enhance their biocompatibility, or use them for molecular anchoring. However, the stability of silica shells and the dispersion of core–shell nanostructures remain the main limita… Show more

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Cited by 66 publications
(52 citation statements)
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“…To control shell thickness, the amount of TEOS (1 µL/0.1 µL/0.01 µL) was varied forming 20, 6, and 4 nm thick shells, respectively (Figure S9, Supporting Information). To promote the formation of uniform thin shells (<10 nm), the solution was sonicated for 12 h overnight following a procedure by Montaño‐Priede et al The encapsulated particles were washed at 3.5 kG for 11 min before being resuspended to volume in water.…”
Section: Methodsmentioning
confidence: 99%
“…To control shell thickness, the amount of TEOS (1 µL/0.1 µL/0.01 µL) was varied forming 20, 6, and 4 nm thick shells, respectively (Figure S9, Supporting Information). To promote the formation of uniform thin shells (<10 nm), the solution was sonicated for 12 h overnight following a procedure by Montaño‐Priede et al The encapsulated particles were washed at 3.5 kG for 11 min before being resuspended to volume in water.…”
Section: Methodsmentioning
confidence: 99%
“…[16] The resulting electrosteric stabilization facilitates a transfer of metal nanoparticles with sufficiently thick silica coatings into aqueous or organic media and has been shown to efficiently prevent irreversible aggregation, even in liquids with extremely high ionic strengths such as simulated body fluids and typical saline buffers. [17,18] Besides its key importance for biomedical usage, high colloidal stability is also advantageous for applications in nanophotonics and catalysis, as aggregation and eventual fusion of metal nanoparticles is known to induce drastic changes in the plasmonic properties and a significant loss of activity, in particular after high temperature treatments. [19][20][21][22][23] Moreover, the improved mechanical stability imposed by the coating shells can be used to prevent morphological changes during the controlled alloying of bimetallic particles, [24,25] and has been employed to fixate the shape of 3D nanoparticle clusters.…”
Section: Colloidal Chemical and Thermal Stabilizationmentioning
confidence: 99%
“…Silica shells prepared by the different sol-gel approaches presented in the previous section are usually characterized by a low condensation degree and a high content of silanol (Si−OH) groups, which reduce their chemical stability in water and biological media. [17] In basic environments or even in pure water, silanol groups in the silica network can readily lead to dissolution of the shells on time scales ranging from minutes to days. [88] The most extended method to improve the stability of silica in water, producing particles that retain their properties over months, is a temperature treatment that may involve heating the sample for several hours in the 100 °C -600 °C range, or subjecting it to extended reflux in boiling solvents.…”
Section: Unconventional Routesmentioning
confidence: 99%
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“…In addition, silica NPs are prone to repulse each other because of their surface hydroxy groups which results in good stability. [25][26][27] Thus, silica-coated core-shell NPs have recently gained importance. Although the silica shell provides biocompatibility, the core serves as a functional part and can be accessed through its magnetic or SPR properties.…”
Section: Introductionmentioning
confidence: 99%