Details
Original language | English |
---|---|
Article number | 2206379 |
Number of pages | 7 |
Journal | SMALL |
Volume | 19 |
Issue number | 12 |
Publication status | Published - 22 Mar 2023 |
Abstract
Heterostructured Au/CuS nanocrystals (NCs) exhibit localized surface plasmon resonance (LSPR) centered at two different wavelengths (551 and 1051 nm) with a slight broadening compared to respective homostructured Au and CuS NC spectra. By applying ultrafast transient absorption spectroscopy we show that a resonant excitation at the respective LSPR maxima of the heterostructured Au/CuS NCs leads to the characteristic hot charge carrier relaxation associated with both LSPRs in both cases. A comparison of the dual plasmonic heterostructure with a colloidal mixture of homostructured Au and CuS NCs shows that the coupled dual plasmonic interaction is only active in the heterostructured Au/CuS NCs. By investigating the charge carrier dynamics of the process, we find that the observed interaction is faster than phononic or thermal processes (< 100 fs). The relaxation of the generated hot charge carriers is faster for heterostructured nanocrystals and indicates that the interaction occurs as an energy transfer (we propose Landau damping or interaction via LSPR beat oscillations as possible mechanisms) or charge carrier transfer between both materials. Our results strengthen the understanding of multiplasmonic interactions in heterostructured Au/CuS NCs and will significantly advance applications where these interactions are essential, such as catalytic reactions.
Keywords
- hot charge carrier relaxation, localized surface plasmon resonance, localized surface plasmon resonance (LSPR), transient absorption spectroscopy, ultrafast dynamics
ASJC Scopus subject areas
- Biochemistry, Genetics and Molecular Biology(all)
- Biotechnology
- Chemistry(all)
- Materials Science(all)
- Biomaterials
- Materials Science(all)
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In: SMALL, Vol. 19, No. 12, 2206379, 22.03.2023.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Probing Bidirectional Plasmon-Plasmon Coupling-Induced Hot Charge Carriers in Dual Plasmonic Au/CuS Nanocrystals
AU - Bessel, Patrick
AU - Niebur, André
AU - Kranz, Daniel
AU - Lauth, Jannika
AU - Dorfs, Dirk
N1 - Funding Information: P.B. and A.N. contributed equally to this work. The authors would like to thank Armin Feldhoff for providing the XRD facility. P.B. is grateful for being funded by the Hannover School for Nanotechnology (HSN). D.D. thanks the Deutsche Forschungsgemeinschaft for the DFG Research Grant 1580/5‐1. D.D. and J.L. are thankful for funding by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy within the Cluster of Excellence PhoenixD (EXC2122, Project ID 390833453) and access to the Ti:sapphire amplifier system (major equipment DFG, Project ID 231415720, Michael Oestreich, Jens Hübner). J.L. is grateful for funding through the Caroline Herschel program of Leibniz Universität Hannover. D.K. is grateful for funding by the Konrad‐Adenauer‐Stiftung (KAS). Open access funding enabled and organized by Projekt DEAL.
PY - 2023/3/22
Y1 - 2023/3/22
N2 - Heterostructured Au/CuS nanocrystals (NCs) exhibit localized surface plasmon resonance (LSPR) centered at two different wavelengths (551 and 1051 nm) with a slight broadening compared to respective homostructured Au and CuS NC spectra. By applying ultrafast transient absorption spectroscopy we show that a resonant excitation at the respective LSPR maxima of the heterostructured Au/CuS NCs leads to the characteristic hot charge carrier relaxation associated with both LSPRs in both cases. A comparison of the dual plasmonic heterostructure with a colloidal mixture of homostructured Au and CuS NCs shows that the coupled dual plasmonic interaction is only active in the heterostructured Au/CuS NCs. By investigating the charge carrier dynamics of the process, we find that the observed interaction is faster than phononic or thermal processes (< 100 fs). The relaxation of the generated hot charge carriers is faster for heterostructured nanocrystals and indicates that the interaction occurs as an energy transfer (we propose Landau damping or interaction via LSPR beat oscillations as possible mechanisms) or charge carrier transfer between both materials. Our results strengthen the understanding of multiplasmonic interactions in heterostructured Au/CuS NCs and will significantly advance applications where these interactions are essential, such as catalytic reactions.
AB - Heterostructured Au/CuS nanocrystals (NCs) exhibit localized surface plasmon resonance (LSPR) centered at two different wavelengths (551 and 1051 nm) with a slight broadening compared to respective homostructured Au and CuS NC spectra. By applying ultrafast transient absorption spectroscopy we show that a resonant excitation at the respective LSPR maxima of the heterostructured Au/CuS NCs leads to the characteristic hot charge carrier relaxation associated with both LSPRs in both cases. A comparison of the dual plasmonic heterostructure with a colloidal mixture of homostructured Au and CuS NCs shows that the coupled dual plasmonic interaction is only active in the heterostructured Au/CuS NCs. By investigating the charge carrier dynamics of the process, we find that the observed interaction is faster than phononic or thermal processes (< 100 fs). The relaxation of the generated hot charge carriers is faster for heterostructured nanocrystals and indicates that the interaction occurs as an energy transfer (we propose Landau damping or interaction via LSPR beat oscillations as possible mechanisms) or charge carrier transfer between both materials. Our results strengthen the understanding of multiplasmonic interactions in heterostructured Au/CuS NCs and will significantly advance applications where these interactions are essential, such as catalytic reactions.
KW - hot charge carrier relaxation
KW - localized surface plasmon resonance
KW - localized surface plasmon resonance (LSPR)
KW - transient absorption spectroscopy
KW - ultrafast dynamics
UR - http://www.scopus.com/inward/record.url?scp=85146317487&partnerID=8YFLogxK
U2 - 10.48550/arXiv.2210.11144
DO - 10.48550/arXiv.2210.11144
M3 - Article
AN - SCOPUS:85146317487
VL - 19
JO - SMALL
JF - SMALL
SN - 1613-6810
IS - 12
M1 - 2206379
ER -