Deciphering Aggregation-Induced Tunable Circular Dichroism of AuBP@Ag and AuBP@Au Chiral Core–Shell Plasmonic Nanoparticles
Abstract
Plasmonic nanoparticles exhibiting strong and tunable chiroptical signals have been drawing much interest recently due to their potential vast applications. A few years ago, it was shown that seed-mediated metal growth can be harnessed to make single nanoparticles intrinsically chiral. Such structures typically manifest strong circular dichroism spectral features that can be further tuned by pure colloidal aggregation, as shown by recent experiments on chiral AuBP@Au and AuBP@Ag core–shell bipyramids. Nevertheless, the origin of such effects, either CD suppression or the rise of new CD bands upon aggregation, has remained obscure. Here, by combining theoretical modeling and experiments, we shed light on such phenomenon, disclosing that single-particle chirality drives the formation of either chiral or achiral aggregates depending on the shape and metal composition of the outer shell, thereby suggesting further avenues to tailor chirality at the nanoscale.
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BibTeX
@article{romanelli2026deciphering,
title = {{Deciphering Aggregation-Induced Tunable Circular Dichroism of AuBP@Ag and AuBP@Au Chiral Core–Shell Plasmonic Nanoparticles}},
author = {Marco Romanelli and Pablo Mariani and Antonio Carone and Anthony Désert and Stephane Parola and Stefano Corni and Ivan Rivalta},
journal = {Journal of Physical Chemistry Letters},
year = {2026},
month = oct,
doi = {10.1021/acs.jpclett.6c02669},
url = {https://hal.science/hal-05830674v1},
note = {CC BY},
}
RIS
TY - JOUR
TI - Deciphering Aggregation-Induced Tunable Circular Dichroism of AuBP@Ag and AuBP@Au Chiral Core–Shell Plasmonic Nanoparticles
AU - Marco Romanelli
AU - Pablo Mariani
AU - Antonio Carone
AU - Anthony Désert
AU - Stephane Parola
AU - Stefano Corni
AU - Ivan Rivalta
PY - 2026
DA - 2026/10/15
JO - Journal of Physical Chemistry Letters
DO - 10.1021/acs.jpclett.6c02669
UR - https://hal.science/hal-05830674v1
AB - Plasmonic nanoparticles exhibiting strong and tunable chiroptical signals have been drawing much interest recently due to their potential vast applications. A few years ago, it was shown that seed-mediated metal growth can be harnessed to make single nanoparticles intrinsically chiral. Such structures typically manifest strong circular dichroism spectral features that can be further tuned by pure colloidal aggregation, as shown by recent experiments on chiral AuBP@Au and AuBP@Ag core–shell bipyramids. Nevertheless, the origin of such effects, either CD suppression or the rise of new CD bands upon aggregation, has remained obscure. Here, by combining theoretical modeling and experiments, we shed light on such phenomenon, disclosing that single-particle chirality drives the formation of either chiral or achiral aggregates depending on the shape and metal composition of the outer shell, thereby suggesting further avenues to tailor chirality at the nanoscale.
SN - 1948-7185
SN - 1948-7185
ER -