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Extending nanoscale patterning with multipolar surface plasmon resonances.

Issam Kherbouche¹, Danielle MacRae², Théo Geronimi Jourdain³

¹Université de Paris, ITODYS, CNRS, UMR 7086, 15 rue J-A de Baïf, F-75013 Paris, France. nordin.felidj@univ-paris-diderot.fr and UFR Biomedicale, UMR 8601 Université Paris Descartes Sorbonne Paris Cite, 45 Rue des Saint Péres, 70005 Paris, France.

|June 3, 2021

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This summary is machine-generated.

Researchers used plasmonic excitation to precisely control where molecules attach to gold nanotriangles. This technique allows for site-selective surface functionalization of nanoparticles for advanced applications.

Area of Science:

Nanotechnology
Surface Chemistry
Plasmonics

Background:

Plasmonic excitation of metallic nanoparticles enables nanoscale chemical reactions.
Surface functionalization of nanoparticles is crucial for advanced applications.
Diazonium salt chemistry offers a photoinduced route for surface modification.

Purpose of the Study:

To demonstrate site-selective grafting of aryl films on gold nanotriangles using plasmonic multipolar modes.
To investigate the correlation between electric field enhancement and grafting location.
To explore a new strategy for spatially controlled surface functionalization of plasmonic nanoparticles.

Main Methods:

Utilized multipolar localized surface plasmon modes of single gold nanotriangles.

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Employed diazonium salt chemistry for surface grafting.

Performed finite-difference time-domain (FDTD) calculations to map electric field distribution.

Main Results:

Achieved site-selective grafting of aryl films on specific areas of gold nanotriangles.
Grafting occurred preferentially at locations of maximum electric field enhancement.
Experimental results showed good agreement with FDTD simulations of electric field localization.

Conclusions:

Plasmonic excitation provides a pathway for precise, nanoscale control over surface functionalization.
This method enables targeted attachment of molecules to 'hot spot' regions on nanoparticles.
The approach holds promise for multiplexing, sensing, and nanoscale optical patterning.