Fabrication and Characterization of Silver-Tin Dioxide Core-Shell Structured Nanocomposite Particles |
Paper ID : 1444-UFGNSM-FULL |
Authors: |
Abstract: |
Synthesis of core-shell structure nanoparticles with metallic (silver) core and semiconductor (tin dioxide) shell was carried out via a facile soft-chemical process. Silver colloids were synthesized by a modified aqueous reduction technique to obtain proper nanoparticles for shell deposition. Afterwards, the encapsulation of these colloids with metal oxide shell was conducted by a simple hydrothermal process. UV-Visible spectroscopy plays a significant role in monitoring the progress of the reaction. Optical absorption spectra of tin dioxide deposited silver cores showed distinct red shift compared with bare silver nanoparticles, which indicated that silver-tin dioxide core-shell nanocomposite particles appeared to be formed. The core-shell structure formation was characterized by X-ray diffraction pattern (XRD) and transmission electron microscopy (TEM). XRD pattern showed distinct peaks corresponding to cubic silver and tetragonal tin dioxide, and any peak corresponding to alloy compounds was not observed. This corroborates the claim of nanocomposite fabrication. TEM results demonstrated that the tin dioxide shell encapsulated the silver core particles, which can lead to full protection of metal cores from coagulation as well as modification of the physical properties of nanoparticles. |
Keywords: |
Nanocomposite, Nanoparticle, Core-Shell structure, Silver, Thin dioxide |
Status : Paper Accepted (Poster Presentation) |