Event Title

Manipulating the Optical Properties of Hollow Pd/Ag and Pt/Ag Nanoparticles Synthesized by Galvanic Replacement Reaction

Location

Hall of Governors

Start Date

7-4-2017 11:15 AM

End Date

7-4-2017 12:15 PM

Description

Considerable efforts have recently been devoted to the fabrication of metallic nanostructures on account of their tunable morphologies which can lead to new and fascinating optical properties. These properties of a metallic nanostructure are mostly determined by its size, shape, composition and structure. Hollow metallic nanostructures have attracted much interest as their surface plasmonic properties and catalytic activities are completely different from those of solid nanoparticles.

Galvanic replacement reaction (GRR) was known to be a powerful synthetic technique for converting solid metal nanostructures into hollow ones. Nanoparticles fabricated from Ag-based alloys find extensive applications in catalysis, electrocatalysis, and optics because their surface plasmon resonance (SPR) bands appear in the visible region.

It has been reported that the surface plasmon resonance peaks of hollow bimetallic Au/Ag nanostructures could be readily tuned by controlling the Ag–Au ratio in the replacement reaction. However, fewer attempts have been made to study the optical properties of Pt/Ag and Pd/Ag based bimetallic nanoparticles compared to those of the Ag–Au system, probably because Pt and Pd nanoparticles do not usually exhibit surface plasmon resonance peaks in the visible spectrum. However, it has been demonstrated recently that the surface plasmon resonance peak of Pd nanoparticles could be tuned to 520 nm by the formation of large hollow nanocages.

Hence In this presentation we will discuss a new synthetic route for the controllable synthesis of Pt/Ag and Pd/Ag based bimetallic nanoparticles exhibiting tunable SPR extinction peaks in the visible region by applying galvanic replacement reaction on Ag templates in the presence of K2PtCl4 and K2PdCl4 salts.

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Apr 7th, 11:15 AM Apr 7th, 12:15 PM

Manipulating the Optical Properties of Hollow Pd/Ag and Pt/Ag Nanoparticles Synthesized by Galvanic Replacement Reaction

Hall of Governors

Considerable efforts have recently been devoted to the fabrication of metallic nanostructures on account of their tunable morphologies which can lead to new and fascinating optical properties. These properties of a metallic nanostructure are mostly determined by its size, shape, composition and structure. Hollow metallic nanostructures have attracted much interest as their surface plasmonic properties and catalytic activities are completely different from those of solid nanoparticles.

Galvanic replacement reaction (GRR) was known to be a powerful synthetic technique for converting solid metal nanostructures into hollow ones. Nanoparticles fabricated from Ag-based alloys find extensive applications in catalysis, electrocatalysis, and optics because their surface plasmon resonance (SPR) bands appear in the visible region.

It has been reported that the surface plasmon resonance peaks of hollow bimetallic Au/Ag nanostructures could be readily tuned by controlling the Ag–Au ratio in the replacement reaction. However, fewer attempts have been made to study the optical properties of Pt/Ag and Pd/Ag based bimetallic nanoparticles compared to those of the Ag–Au system, probably because Pt and Pd nanoparticles do not usually exhibit surface plasmon resonance peaks in the visible spectrum. However, it has been demonstrated recently that the surface plasmon resonance peak of Pd nanoparticles could be tuned to 520 nm by the formation of large hollow nanocages.

Hence In this presentation we will discuss a new synthetic route for the controllable synthesis of Pt/Ag and Pd/Ag based bimetallic nanoparticles exhibiting tunable SPR extinction peaks in the visible region by applying galvanic replacement reaction on Ag templates in the presence of K2PtCl4 and K2PdCl4 salts.