| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1615071 | Journal of Alloys and Compounds | 2013 | 7 Pages |
Highly monodispersed Ag/SiO2 nanohybrids with excellent antibacterial property were synthesized by using DMF as a reducing agent and employing an additional redox potential of metal Fe3+ ion as a catalytic agent. The obtained Ag/SiO2-2 nanohybrids of about 240 nm were highly monodispersity and uniformity by adding trace Fe3+ ions into the reaction which Ag+ reacted with N,N-dimethyl formamide (DMF) at 70 °C. Compared to the conventional techniques, which need long time and high temperature for silica coating of Ag nanoparticles, this new method was capable of synthesizing monodispersed, uniform, high yield Ag/SiO2 nanohybrids. The electron was transferred from the Fe2+ ion to the Ag+ ion to accelerate the nucleation of silver nanoparticles. The chemical structures, morphologies and properties of the Ag/SiO2 nanohybrids were characterized by X-ray diffraction (XRD), (High-resolution, Scanning transmission) transmission electron microscopy (TEM, HRTEM and STEM), and X-ray photoelectron spectroscopy (XPS), and UV–vis spectroscopy (UV–vis) and test of antibacterial. The results demonstrated that the silver nanoparticles supported on the surface of SiO2 spheres in Ag/SiO2-2 nanohybrids structure, the Ag nanoparticles were homogeneous and monodispersed. The results also indicated that the Ag/SiO2-2 nanohybrid had excellent antibacterial.
Graphical abstractTEM images of the Ag/SiO2-2 nanohybrids. The homogeneous and more mono-disperse Ag nanoparticles deposit on SiO2 spheres. Through this method, Ag nanoparticles are easily formed on the surface of SiO2 compared to other methods.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► We prepared homogeneous and mono-dispersed Ag/SiO2-2 nanohybrids by adding Fe3+ ions. ► The Ag/SiO2-2 nanohybrids had core(SiO2)-shell(Ag) structure. ► The Ag/SiO2-2 nanohybrids exhibited excellent antibacterial activity against bacteria. ► The reaction temperature was lower and the yield of Ag/SiO2-2 nanohybrids were higher.
