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Plasmonic Properties of Self-Assembled Gold Nanocrescents: Implications for Chemical Sensing

Published version
Peer-reviewed

Repository DOI


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Authors

Côté, Marie-Pier; paragon-plus: 6938345 
Boukouvala, Christina; paragon-plus: 6108071 
Richard-Daniel, Josée; paragon-plus: 3072473 
paragon-plus: 1279787  ORCID logo  https://orcid.org/0000-0003-3743-9204
paragon-plus: 135639  ORCID logo  https://orcid.org/0000-0001-5152-2464

Abstract

A bottom-up approach, the Langmuir–Blodgett technique, is used for the preparation of composite thin films of gold nanoparticles and polymers: poly­(styrene-b-2-vinylpyridine), poly-2-vinylpyridine, and polystyrene. The self-assembly of poly­(styrene-b-2-vinylpyridine) at the air–water interface leads to the formation of surface micelles, which serve as a template for the organization of gold nanoparticles into ring assemblies. By using poly-2-vinylpyridine in conjunction with low surface pressure, the distance between nanostructures can be increased, allowing for optical characterization of single nanostructures. Once deposited on a solid substrate, the preorganized gold nanoparticles are subjected to further growth by the reduction of additional gold, leading to a variety of nanostructures which can be divided into two categories: nanocrescents and circular arrays of nanoparticles. The optical properties of individual structures are investigated by optical dark-field spectroscopy and numerical calculations. The plasmonic behavior of the nanostructures is elucidated through the correlation of optical properties with structural features and the identification of dominant plasmon modes. Being based on a self-assembly approach, the reported method allows for the formation of interesting plasmonic materials under ambient conditions, at a relatively large scale, and at low cost. These attributes, in addition to the resonances located in the near-infrared region of the spectrum, make nanocrescents candidates for biological and chemical sensing.

Description

Publication status: Published

Keywords

nanocrescents, localized surface plasmon resonance, self-assembly, block copolymer, metal nanoparticles, gold nanostructures

Journal Title

ACS Applied Nano Materials

Conference Name

Journal ISSN

2574-0970
2574-0970

Volume Title

7

Publisher

American Chemical Society
Sponsorship
Natural Sciences and Engineering Research Council of Canada (NA)
Engineering and Physical Sciences Research Council (EP/R513180/1)
Fonds de recherche du Québec - Nature et technologies (NA)