Facile Fabrication Method and Characterization of Hollow Ag/SiO2 Double-Shelled Spheres
- 6 April 2009
- journal article
- research article
- Published by American Chemical Society (ACS) in Langmuir
- Vol. 25 (13), 7646-7651
- https://doi.org/10.1021/la9002934
Abstract
Hollow Ag/SiO2 double-shelled spheres with silver nanoparticle coating onto the interior wall of hollow silica have been successfully prepared via a novel and facile approach. In this method, negatively charged polystyrene (PS) beads were first modified by Sn2+ ions via electrostatic interaction, and then by Ag+ ions, which were reduced by Sn2+ ions and sodium-potassium tartrate to obtain PS/Ag composite spheres. When these spheres were coated by silica nanoparticles as shells from the hydrolysis and condensation reaction of tetraethoxysilane (TEOS) in isopropanol/ammonia mixture at 15 degrees C, the PS beads were "dissolved" in the same medium subsequently even synchronously, directly forming hollow Ag/SiO2 double-shelled spheres. Neither additional dissolution nor calcination process was used to remove polymer templates. This structure of hollow spheres not only has high catalytic activity, but also will decrease the loss of Ag nanoparticles due to frictional and/or other mechanical forces and the possible aggregations, and have controllable and selective catalytic activity compared to these common nanocomposite spheres with noble metal nanoparticles coating on the surfaces of supporting beads.Keywords
This publication has 30 references indexed in Scilit:
- Hollow spheres of silver synthesized using polyelectrolyte capsules as microreactorsColloids and Surfaces A: Physicochemical and Engineering Aspects, 2008
- Novel Method to Fabricate SiO2/Ag Composite Spheres and Their Catalytic, Surface-Enhanced Raman Scattering PropertiesThe Journal of Physical Chemistry C, 2007
- Synthesis and Characterization of Antibacterial Ag−SiO2 NanocompositeThe Journal of Physical Chemistry C, 2007
- Fluorescent Core−Shell Ag@SiO2 Nanocomposites for Metal-Enhanced Fluorescence and Single Nanoparticle Sensing PlatformsJournal of the American Chemical Society, 2007
- Catalytic Properties of Silver Nanoparticles Supported on Silica SpheresThe Journal of Physical Chemistry B, 2005
- A General Method To Coat Colloidal Particles with SilicaLangmuir, 2003
- Deposition of Silver Nanoparticles on Silica Spheres by Pretreatment Steps in Electroless PlatingChemistry of Materials, 2001
- Silver Nanoshells: Variations in Morphologies and Optical PropertiesThe Journal of Physical Chemistry B, 2001
- Preparation of Ag/SiO2 Nanosize Composites by a Reverse Micelle and Sol−Gel TechniqueLangmuir, 1999
- Controlled Method for Silica Coating of Silver Colloids. Influence of Coating on the Rate of Chemical ReactionsLangmuir, 1998