Triangular Au–Ag Nanoframes with Tunable Surface Plasmon Resonance Signal from Visible to Near-Infrared Region

摘要

In recent years, metal hollow nanostructures are intriguing to be synthesized and studied because they exhibit unique surface plasmonic properties. Although many methods for tuning the surface plasmonic absorption peaks of silver nanostructures have been reported, it still remains a great challenge to produce hollow Ag nanostructure with controllable surface plasmon resonance (SPR) via a facile method. In this paper, triangular Au–Ag nanoframes were successfully fabricated using triangular silver nanoplates as templates, through galvanic replacement reaction between the silver nanoplates and HAuCl4, exhibiting tuneable SPR response from visible (605 nm) to near-infrared region (1,235 nm).