Paper Title:
Effect of Annealing on Ag-Doped Submicron Silica Powder Prepared with Modified Stöber Method
  Abstract

Antibacterial silver can be used against such micro-organisms as bacteria and molds. When Ag nanoparticles are attached to an inorganic carrier, e.g., silica long-term antimicrobial functionality can be gained. Such Ag-SiO2 particles are potential for water purification or bactericidal applications. In this work, submicron sized silica particles doped with Ag were prepared by the modified Stöber method. The as-prepared powder was air-dried and annealed for 75 minutes at 573, 673, 773, 873, 973, 1073, 1173, or 1273 K in air. The powders were studied by DSC/TGA, XRD, SEM, TEM and UV-vis methods. The as-prepared powder consisted of round silica particles having size around several hundred nanometers. XRD and SEM studies confirmed that the powder consisted of metallic silver nanoparticles on the submicron silica surface after annealing at 873 K or higher. According to the SEM study the silver particles had an average particle size between 19-400 nm depending on the annealing temperature. DSC was used to determine the phase transformation temperatures. After annealing the Ag-SiO2 powder at 873 K the TEM study suggested that the silver had crystalline structure. The XRD studies confirmed that silver appeared as a FCC crystal structure. The UV-vis measurements of Ag-SiO2 powder annealed at and below 773 K showed a steady increase in absorption with decreasing wavelength without absorption peaks. Annealing at 873 K and above resulted in a strong peak in between 404 nm and 416 nm. This peak can be attributed to the surface plasmon resonance of silver nanoparticles.

  Info
Periodical
Edited by
Hyungsun Kim, Jian Feng Yang, Chuleol Hee Han, Somchai Thongtem and Soo Wohn Lee
Pages
449-452
DOI
10.4028/www.scientific.net/MSF.695.449
Citation
J. Larismaa, T. Honkanen, Y. L. Ge, O. Söderberg, M. Friman, S. P. Hannula, "Effect of Annealing on Ag-Doped Submicron Silica Powder Prepared with Modified Stöber Method", Materials Science Forum, Vol. 695, pp. 449-452, 2011
Online since
July 2011
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Sergey Kozyukhin, Alexey A. Sherchenkov
Abstract:Phase change memory materials of Ge-Sb-Te system [(GeTe)m(Sb2Te3)n (m : n = 1:1; 1:2; 2:1)] were studied during thermal cycling by...
22
Authors: N.I. Vlasova, V.S. Gaviko, A.G. Popov, N.N. Shchegoleva, L.A. Stashkova, Dmitriy Gunderov, Xavier Sauvage
Abstract:Equiatomic FePd alloy in the ordered state has been processed by means of high-pressure torsion deformation (HPTD) and then annealed. X-ray...
392
Authors: Katarzyna Bałdys, Grzegorz Dercz, Łukasz Madej
Abstract:The ferromagnetic shape memory alloys (FSMA) are relatively the brand new smart materials group. The most interesting issue connected with...
171
Authors: Jian Sheng Xie, Ping Luan, Jin Hua Li
Chapter 9: Composite Materials II
Abstract:Using magnetron sputtering technology, the CuInSi nanocomposite thin films were prepared by multilayer synthesized method. The structure of...
2770
Authors: Ching Fang Tseng, Yun Pin Lu, Hsin Han Tung, Pai Chuan Yang
Chapter 3: Electrical, Magnetic and Optical Ceramics
Abstract:This paper describes physical properties of (Ca0.8Sr0.2)TiO3 were deposited by sol-gel method with a fix per-heating temperature of 400oC for...
1171