Back to Search
Start Over
Hydrophobation and self-assembly of core-shell Au@SiO2 nanoparticles
- Source :
-
Colloids & Surfaces A: Physicochemical & Engineering Aspects . Jul2007, Vol. 302 Issue 1-3, p383-387. 5p. - Publication Year :
- 2007
-
Abstract
- Abstract: Herein, we reported an efficient process for preparing monodisperse gold nanoparticles coated with silica shells (Au@SiO2) by vortex mixture instead of magnetic stirring. Without using any other surface coupling silane reagent such as 3-aminopropyltriethoxysilane (APS), core-shell Au@SiO2 nanoparticles could be easily obtained. TEM and UV–vis were employed to characterize the morphologies and the optical properties of Au@SiO2 nanoparticles. Subsequently, hydrophobic Au@SiO2 nanoparticles were obtained by grafting hydrocarbon chains on silica surfaces of the particles using the silane-coupling reagent octadecyltrichlorosilane (OTS). These hydrophobic Au@SiO2 nanoparticles could easily self-assemble onto the air–water interface to form close packed two dimensional nanoparticle arrays. The particle arrays could be transferred onto solid substrates to form Au@SiO2 film. The composition of the hydrophobic Au@SiO2 nanoparticles was examined by Fourier-transform IR spectroscopy (FTIR). The microstructure of the film of hydrophobic Au@SiO2 nanoparticles was investigated by the scanning electron microscope (SEM) and the atomic force microscope (AFM), respectively. [Copyright &y& Elsevier]
- Subjects :
- *NANOPARTICLES
*OXIDES
*SURFACE chemistry
*SURFACES (Technology)
Subjects
Details
- Language :
- English
- ISSN :
- 09277757
- Volume :
- 302
- Issue :
- 1-3
- Database :
- Academic Search Index
- Journal :
- Colloids & Surfaces A: Physicochemical & Engineering Aspects
- Publication Type :
- Academic Journal
- Accession number :
- 25033284
- Full Text :
- https://doi.org/10.1016/j.colsurfa.2007.02.069