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Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics

Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics

Published on: May 28, 2016

Ag-Ag2S Hybrid Nanoprisms: Structural versus Plasmonic Evolution.

Mohammad M Shahjamali^1,2,3, Yong Zhou^1,4, Negin Zaraee^1,3

¹Department of Chemistry and International Institute for Nanotechnology, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208, United States.

|May 6, 2016

Summary

This summary is machine-generated.

Silver-silver sulfide (Ag-Ag2S) hybrid nanostructures exhibit tunable plasmonics. Sulfidation of silver prisms can shift optical properties blue or red, depending on reaction conditions and Ag2S formation sites.

Keywords:

DDA anisotropic core−shell nanoparticles anisotropic reaction discrete dipole approximation hybrid nanoplate metal−semiconductor sulfidation

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Area of Science:

Materials Science
Nanotechnology
Physical Chemistry

Background:

Ag-Ag2S hybrid nanostructures offer enhanced stability and tunable plasmonic properties.
Synthesis via sulfidation of silver nanoparticles is poorly understood, yielding inconsistent material properties.

Purpose of the Study:

Investigate the structural and plasmonic evolution of Ag-Ag2S nanoprisms during silver sulfidation.
Clarify the reaction mechanisms and their impact on optical properties.

Main Methods:

Combined theoretical modeling and experimental synthesis of Ag-Ag2S nanoprisms.
Analysis of structural changes and optical property shifts during sulfidation.

Main Results:

Sulfidation can cause either blue or red shifts in the dipole plasmon extinction, contrary to previous assumptions.
Ag2S formation occurs at prism tips and/or (111) surfaces, creating core(Ag)-anisotropic shell(Ag2S) structures.
The direction of plasmon shift depends on the Ag2S distribution and shell thickness.

Conclusions:

The sulfidation process of Ag precursors is complex, influencing Ag-Ag2S nanostructure morphology and plasmonic behavior.
Understanding the reaction pathways is crucial for controlling the optical properties of these hybrid nanomaterials.