Hagura, Nobuhiro and Widiyastuti, W. and Iskandar, Ferry and Okuyama, Kikuo (2010) Characterization of silica-coated silver nanoparticles prepared by a reverse micelle and hydrolysis-condensation process. CHEMICAL ENGINEERING JOURNAL, 156 (1). 200 -205 . ISSN 1385-8947
Full text is not hosted in this archive but may be available via the Official URL, or by requesting a copy from the corresponding author.
Described herein is the synthesis of individually silica-coated silver nanoparticles using a reverse micelle method followed by hydrolysis and condensation of tetraethoxysilane (TEOS). The size of a silica-coated silver nanoparticle can be controlled by changing the reaction time and the concentration of TEOS. By maintaining the size of a silver nanoparticle as a core particle at around 7 nm, the size of a silica-coated silver nanoparticle increased from 13 to 28 nm as the reaction time increased from 1 to 9 h due to an increase in silica thickness. The size of silica-coated silver nanoparticles also increased from 15 to 22 nm as the TEOS concentration increased from 7.8 to 40 mM. The size of a silica-coated silver nanoparticle can be accurately predicted using the rate of the hydrolysis reaction for TEOS. Neither the dispersion nor the film of silica-coated silver nanoparticles exhibited any peak shifting during surface plasmon resonance (SPR) at around 410 nm, whereas, without silica coating, the SPR peak of Ag film shifted to 466 nm. (C) 2009 Elsevier B. V. All rights reserved.
|Subjects:||Material Science > Nanochemistry|
|Deposited On:||02 Jun 2010 18:06|
|Last Modified:||02 Jun 2010 18:06|
Repository Staff Only: item control page