Tunable Optical Properties of Ag–TiO₂ Nanorod Composites Based on Interparticle Plasmon Coupling

Abstract

The metal-semiconductor composites with unique optical properties are highly desirable. Here we report that Ag-TiO 2 nanorod composites with two distinctive absorption peaks exhibit tunable plasmon coupling behaviors. The intensity of the long-wave absorption could be enhanced by modifying the geometry of TiO 2 particles, while such absorption is due to the plasmon coupling between the Ag particles. The long-wave absorption bands can be tuned by varying the reaction time and changing the amount of silver acetate. Furthermore, the Ag-TiO 2 composites were also prepared by photochemical reduction method which con¯rmed the previous properties. These results may help to design metal-semiconductor systems with desirable optical properties.

Ag–TiO2 Hybrid Nanocrystal Photocatalyst: Hydrogen Evolution under UV Irradiation but Not under Visible-Light Irradiation

“…For example, Ag–TiO 2 HNCs with a high number density of Ag nanoparticles on the TiO 2 surface can give rise to interparticle coupling of the surface plasmon. In particular, Ag–TiO 2 HNCs in which rod-shape TiO 2 nanocrystals are multiply decorated with Ag nanoparticles give SPR absorbance spectra that mimic the SPR features of Ag nanorods, showing red-shifted longitudinal SPR modes. − This feature, in combination with changes in SPR due to the size and shape of the Ag nanoparticles, allows multiple avenues to change the light absorption properties of the Ag–TiO 2 HNCs. However, few studies report Ag SPR-sensitized photocatalysis, and there is no putative evidence of this mechanism in Ag–TiO 2 HNCs.…”

Influence of Preparation Procedure on Physicochemical and Antibacterial Properties of Titanate Nanotubes Modified with Silver

“…Silver NPs are predominantly synthesized from silver nitrate (AgNO 3 ) and silver acetate (CH 3 COOAg) as the precursors [14,15,16,25]. Various reported methods for the preparation of Ag/TiO 2 nanocomposites are photoreduction [13], sol-gel [26], chemical reduction [27], template induced and solvothermal [28] methods.…”