Preparation of functional silane-stabilized gold colloids in the (sub)nanometer size range
Details
Serval ID
serval:BIB_DCD34B683FF3
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Preparation of functional silane-stabilized gold colloids in the (sub)nanometer size range
Journal
Langmuir
ISSN
0743-7463
Publication state
Published
Issued date
1997
Volume
13
Number
15
Pages
3921-3926
Language
english
Abstract
A synthesis method is introduced for very small uniform gold particles (diameter less than 5 nm), based on the reduction of hydrogen tetrachloroaurate(III) in ethanol in the presence of (gamma-mercaptopropyl)trimethoxysilane (MPS). The surface layer of MPS molecules gives the gold particles a high colloidal stability and allows in principle further reaction with any silane coupling agent. Decrease of the HAuCl(4): MPS ratio allows a controlled reduction of gold particle size, resulting in remarkably uniform gold dusters of (sub)nanometer size, observed with high-angle-annular-dark-field scanning transmission electron microscopy. After attachment of (gamma-aminopropyl)triethoxysilane (APS) to the MPS surface layer, other molecules may be covalently bound to the gold colloid via the amine group of APS. As an illustrative example we prepared in this manner gold particles labeled with a fluorescent dye. The chemical structure of the surface silanes was studied with Fourier transform infrared spectroscopy.
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Create date
18/10/2012 14:02
Last modification date
20/08/2019 16:01