Preparation and Antibiotic Property of Ag-SiO₂ Nanoparticle

Abstract

Silica particle was deposited with Ag nanoparticles to achieve hybrid structure. First, silica nanoparticles were synthesized according to the well-known Stöber method by hydrolysis and condensation of TEOS in a mixture of ethanol with water, using ammonia as catalyst to initiate the reaction. These SiO₂ nanoparticles were dried at 100°C. We measured the size of these nanoparticles with transmission electron microscopy (TEM). Second, Ag-SiO₂ nanoparticles were synthesized by reaction with AgNO₃ and SiO₂ nanoparticles at room temperature for 12 hrs. Results show silica nanoparticles of about 110 nm size deposited with Ag nanoparticles. Ag-SiO₂ nanoparticles were investigated with TEM images, energy dispersive X-ray analysis (EDX) spectrum. The antibiotic property was examined with disk plate method.

Keywords:

• Ag-SiO₂ nanoparticle
• antibiotic property
• hybrid structures

Acknowledgments

This work was supported by Functional Chemicals Development Program in 2004 ∼ 2005 and Coreana cosmetics Co., Ltd., and Y. H. Kim would like to thank the financial support by the Brain Korea 21 project in 2006.