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- Title
UV-induced synthesis, characterization and formation mechanism of silver nanoparticles in alkalic carboxymethylated chitosan solution.
- Authors
Ling Huang; Maolin L. Zhai; Dewu W. Long; Jing Peng; Ling Xu; Guozhong Z. Wu; Jiuqiang Q. Li; Genshuan S. Wei
- Abstract
Abstract  The silver nanoparticles (AgNPs) were synthesized in an alkalic aqueous solution of silver nitrate (AgNO3)/carboxymethylated chitosan (CMCTS) with ultraviolet (UV) light irradiation. CMCTS, a water-soluble and biocompatible chitosan derivative, served simultaneously as a reducing agent for silver cation and a stabilizing agent for AgNPs in this method. UVâvis spectra and transmission electron microscopy (TEM) images analyses showed that the pH of AgNO3/CMCTS aqueous solutions, the concentrations of AgNO3 and CMCTS can affect on the size, amount of synthesized AgNPs. Further by polarized optical microscopy it was found that the CMCTS with a high molecular weight leads to a branch-like AgNPs/CMCTS composite morphology. The diameter range of the AgNPs was 2â8 nm and they can be dispersed stably in the alkalic CMCTS solution for more than 6 months. XRD pattern indicated that the AgNPs has cubic crystal structure. The spectra of laser photolysis of AgNO3/CMCTS aqueous solutions identified the early reduction processes of silver cations (Ag) by hydrated electron $$(\hbox{e}_{\rm aq}^{-})$$ formed by photoionization of CMCTS. The rate constant of corresponding reduction reaction was 5.0 Ã 109 Mâ1 sâ1.
- Subjects
NANOPARTICLES; SILVER; CHITOSAN; TRANSMISSION electron microscopy; IRRADIATION; CATIONS; SOLUTION (Chemistry)
- Publication
Journal of Nanoparticle Research, 2008, Vol 10, Issue 7, p1193
- ISSN
1388-0764
- Publication type
Article
- DOI
10.1007/s11051-007-9353-0