Directed Assembly of Gold Bipyramids and Quantum Dots Using Click Chemistry for Plasmon-Exciton Coupling

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FinalRevisedManuscriptBaradaranKayyal.pdf (1.26 MB)
 an5c02896si001.pdf (577.69 KB)

Links to Files

https://pubs.acs.org/doi/10.1021/acsanm.5c02896

Permanent Link

https://doi.org/10.1021/acsanm.5c02896
 http://hdl.handle.net/11603/40679

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UMBC Chemistry & Biochemistry Department
UMBC Faculty Collection
UMBC Physics Department
UMBC Student Collection

Author/Creator

Author/Creator ORCID

https://orcid.org/0000-0002-6338-0835
 https://orcid.org/0009-0001-1209-9824
 https://orcid.org/0000-0003-1901-1554
 https://orcid.org/0009-0000-8965-2459
 https://orcid.org/0000-0002-6370-8765
 https://orcid.org/0000-0002-7336-5655

Date

2025-09-19

Type of Work

journal articles
postprints
Text

Department

Program

Citation of Original Publication

Baradaran Kayyal, Tohid, Vijin Kizhake Veetil, Reshma Mathew, et al. “Directed Assembly of Gold Bipyramids and Quantum Dots Using Click Chemistry for Plasmon-Exciton Coupling.” ACS Applied Nano Materials 8, no. 39 (2025): 18751–61. https://doi.org/10.1021/acsanm.5c02896.

Rights

This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Nano Materials, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsanm.5c02896.

Subjects

UMBC Laboratory for Optical Studies of Nanoscale Physics
UMBC Daniel Lab
UMBC Meyerhoff Graduate Fellows Program

Abstract

Advances in directed nanoparticle assembly are enabling the development of hybrid nanostructures with enhanced light-matter interaction. Among these hybrid nanostructures are those with coupled plasmonic and excitonic components. Here, we report the design and assembly of hybrid nanostructures for plasmon-exciton coupling, composed of end-to-end pairs of gold bipyramids (AuBPs) with a CdSe/CdS quantum dot (QD) between the AuBPs. The assembly is achieved through a copper-free click reaction between azide-functionalized AuBPs and dibenzocyclooctyne (DBCO)-modified QDs, providing efficient and strong linkage between nanoparticles. The functionalization and assembly of the nanoparticles was verified through infrared and visible absorption spectroscopy, fluorescence spectroscopy, zeta potential measurements, and transmission electron microscopy. The AuBPs provide concentrated electric field confinement at their tips through the excitation of longitudinal plasmon resonances, enabling interaction with excitons in QDs located near the tips. Measurements on single assemblies showed an induced transparency in the plasmon scattering spectrum, characteristic of intermediate coupling between plasmons and excitons. A coupling strength of 45 meV was achieved for single QDs at room temperature. These results highlight the potential of colloidal AuBP-QD assemblies for achieving strong plasmon-exciton coupling using a directed assembly approach enabled by an efficient click chemistry strategy.