Controllable synthesis and characterization of Ag@AgBr core–shell nanowires

Ag@AgBr core–shell nanowires have been synthesized in large quantities via a redox reaction between Ag nanowires and FeBr3 in solution at room temperature. The effect of the molar ratio of Fe:Ag on the formation and optical absorption of the Ag@AgBr core–shell nanowires was systematically studied. The results showed that Ag nanowires were converted into Ag@AgBr core–shell nanowires and finally into AgBr nanorods with the increase of the molar ratio of Fe:Ag. At the same time, the optical absorption of Ag nanowires decreased gradually and disappeared finally. In addition, the growth mechanism of the Ag@AgBr core–shell nanowires was also discussed in detail.

Graphical abstractGrowth process of the Ag@AgBr core–shell nanowires at various molar ratios of Fe:Ag.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Facile solution method at room temperature for the first time. ► Ag nanowires were converted into Ag@AgBr and finally into AgBr nanorods. ► Exquisite core–shell morphology of Ag@AgBr nanostructures. ► Structure and optical properties of the Ag@AgBr. ► Extend to the preparation of other core–shell nanostructures.