Semiconductor Bow-Tie Nanoantenna from Coupled Colloidal Quantum Dot Molecules.
nanoantennas
nanocrystals
photocatalysis
polarization
quantum dots
Journal
Angewandte Chemie (International ed. in English)
ISSN: 1521-3773
Titre abrégé: Angew Chem Int Ed Engl
Pays: Germany
ID NLM: 0370543
Informations de publication
Date de publication:
21 Jun 2021
21 Jun 2021
Historique:
revised:
09
03
2021
received:
25
01
2021
pubmed:
2
4
2021
medline:
2
4
2021
entrez:
1
4
2021
Statut:
ppublish
Résumé
Top-down fabricated nanoantenna architectures of both metallic and dielectric materials show powerful functionalities for Raman and fluorescence enhancement with relevance to single molecule sensing while inducing directionality of chromophore emission with implications for single photon sources. We synthesize the smallest bow-tie nanoantenna by selective tip-to-tip fusion of two tetrahedral colloidal quantum dots (CQDs) forming a dimer. While the tetrahedral monomers emit non-polarized light, the bow-tie architecture manifests nanoantenna functionality of enhanced emission polarization along the bow-tie axis, as predicted theoretically and revealed by single-particle spectroscopy. Theory also predicts the formation of an electric-field hotspot at the bow-tie epicenter. This is utilized for selective light-induced photocatalytic metal growth at that location, unlike growth on the free tips in dark conditions, thus demonstrating bow-tie dimer functionality as a photochemical reaction center.
Identifiants
pubmed: 33793047
doi: 10.1002/anie.202101155
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
14467-14472Subventions
Organisme : H2020 European Research Council
ID : 741767
Informations de copyright
© 2021 Wiley-VCH GmbH.
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