Article ID Journal Published Year Pages File Type
1642992 Materials Letters 2015 4 Pages PDF
Abstract

•Au/Ag nanoframes (Au/AgNF) were prepared by galvanic replacement reaction (GRR) of Ag nanoplates.•By pre-oxidation and GRR, Au/AgNF with 65/35 ratio of Au/Ag was obtained.•The dipole peak further red-shifted than quadrupole peak, found at NIR region.•An optical change was confirmed with discrete dipole approximation simulations.

Metallic hollow nanostructures, prepared using a galvanic replacement reaction (GRR), give rise to hot-spots in electromagnetic fields, due to plasmon coupling between their interior and exterior surface fields. Herein, Au/Ag triangular nanoframes (Au/AgNF) were prepared by a galvanic replacement reaction (GRR) of Ag nanoplates with HAuCl4 in an aqueous solution for 5 min. Through sequential processes of pre-oxidation and GRR, Au/AgNF with 65/35 ratio of Au/Ag was obtained. An optical change in the UV–vis spectra was confirmed with discrete dipole approximation simulations. The dipole peak of Au/AgNF further red-shifted than the quadrupole peak, found at near-infrared region.

Related Topics
Physical Sciences and Engineering Materials Science Nanotechnology
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