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Ahmed A, Banjac K, Verlekar SS, Cometto FP, Lingenfelder M, Galland C. Structural Order of the Molecular Adlayer Impacts the Stability of Nanoparticle-on-Mirror Plasmonic Cavities. ACS PHOTONICS 2021; 8:1863-1872. [PMID: 34164567 PMCID: PMC8212294 DOI: 10.1021/acsphotonics.1c00645] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Indexed: 05/06/2023]
Abstract
Immense field enhancement and nanoscale confinement of light are possible within nanoparticle-on-mirror (NPoM) plasmonic resonators, which enable novel optically activated physical and chemical phenomena and render these nanocavities greatly sensitive to minute structural changes, down to the atomic scale. Although a few of these structural parameters, primarily linked to the nanoparticle and the mirror morphology, have been identified, the impact of molecular assembly and organization of the spacer layer between them has often been left uncharacterized. Here, we experimentally investigate how the complex and reconfigurable nature of a thiol-based self-assembled monolayer (SAM) adsorbed on the mirror surface impacts the optical properties of the NPoMs. We fabricate NPoMs with distinct molecular organizations by controlling the incubation time of the mirror in the thiol solution. Afterward, we investigate the structural changes that occur under laser irradiation by tracking the bonding dipole plasmon mode, while also monitoring Stokes and anti-Stokes Raman scattering from the molecules as a probe of their integrity. First, we find an effective decrease in the SAM height as the laser power increases, compatible with an irreversible change of molecule orientation caused by heating. Second, we observe that the nanocavities prepared with a densely packed and more ordered monolayer of molecules are more prone to changes in their resonance compared to samples with sparser and more disordered SAMs. Our measurements indicate that molecular orientation and packing on the mirror surface play a key role in determining the stability of NPoM structures and hence highlight the under-recognized significance of SAM characterization in the development of NPoM-based applications.
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Affiliation(s)
- Aqeel Ahmed
- Laboratory
of Quantum and Nano-Optics and Institute of Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Karla Banjac
- Max
Planck-EPFL Laboratory for Molecular Nanoscience and Institute of
Physics, École Polytechnique Fédérale
de Lausanne, CH-1015 Lausanne, Switzerland
| | - Sachin S. Verlekar
- Laboratory
of Quantum and Nano-Optics and Institute of Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Fernando P. Cometto
- Max
Planck-EPFL Laboratory for Molecular Nanoscience and Institute of
Physics, École Polytechnique Fédérale
de Lausanne, CH-1015 Lausanne, Switzerland
- Departamento
de Fisicoquímica, Instituto de Investigaciones en Fisicoquímica
de Córdoba, INFIQC−CONICET, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA Córdoba, Argentina
| | - Magalí Lingenfelder
- Max
Planck-EPFL Laboratory for Molecular Nanoscience and Institute of
Physics, École Polytechnique Fédérale
de Lausanne, CH-1015 Lausanne, Switzerland
- E-mail:
| | - Christophe Galland
- Laboratory
of Quantum and Nano-Optics and Institute of Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
- E-mail:
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Henkel C, Wittmann JE, Träg J, Will J, Stiegler LMS, Strohriegl P, Hirsch A, Unruh T, Zahn D, Halik M, Guldi DM. Mixed Organic Ligand Shells: Controlling the Nanoparticle Surface Morphology toward Tuning the Optoelectronic Properties. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e1903729. [PMID: 31778297 DOI: 10.1002/smll.201903729] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2019] [Revised: 10/05/2019] [Indexed: 06/10/2023]
Abstract
Precise control over the ratio of perylene bisimide (PBI) monomers and aggregates, immobilized on alumina nanoparticle (NP) surfaces, is demonstrated. Towards this goal, phosphonic acid functionalized PBI derivatives (PA-PBI) are shown to self-assemble into stoichiometrically mixed monolayers featuring aliphatic, glycolic, or fluorinated phosphonic acid ligands, serving as imbedding matrix (PA-M) to afford core-shell NPs. Different but, nevertheless, defined PBI monomer/aggregate composition is achieved by either the variation in the PA-PBI to PA-M ratios, or the utilization of different PA-Ms. Various steady-state as well as time-resolved spectroscopy techniques are applied to probe the core-shell NPs with respect to changes in their optical properties upon variations in the shell composition. To this end, the ratio between monomer and excimer-like emission assists in deriving information on the self-assembled monolayer composition, local ordering, and corresponding aggregate content. With the help of X-ray reflectivity measurements, accompanied by molecular dynamics simulations, the built-up of the particle shells, in general, and the PBI aggregation behavior, in particular, are explored in depth.
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Affiliation(s)
- Christian Henkel
- Department Chemistry and Pharmacy, Interdisciplinary Center for Molecular Materials (ICMM), Friedrich-Alexander-University Erlangen-Nürnberg, Egerlandstraße 3, 91058, Erlangen, Germany
| | - Judith E Wittmann
- Organic Materials and Devices, Friedrich-Alexander-University Erlangen-Nürnberg, Cauerstraße 3, 91058, Erlangen, Germany
| | - Johannes Träg
- Computer Chemistry Center, Friedrich-Alexander-University Erlangen-Nürnberg, Nägelsbachstraße 25, 91052, Erlangen, Germany
| | - Johannes Will
- Institute for Crystallography and Structural Physics, Friedrich-Alexander-University Erlangen-Nürnberg, Staudtstraße 3, 91058, Erlangen, Germany
- Center for Nanoanalysis and Electron Microscopy, Friedrich-Alexander-University Erlangen-Nürnberg, Cauerstraße 6, 91058, Erlangen, Germany
| | - Lisa M S Stiegler
- Chair of Organic Chemistry II, Friedrich-Alexander-University Erlangen-Nürnberg, Nikolaus-Fiebiger-Straße 10, 91058, Erlangen, Germany
| | - Peter Strohriegl
- Macromolecular Chemistry I, University of Bayreuth, Universitätsstraße 30, 95440, Bayreuth, Germany
| | - Andreas Hirsch
- Chair of Organic Chemistry II, Friedrich-Alexander-University Erlangen-Nürnberg, Nikolaus-Fiebiger-Straße 10, 91058, Erlangen, Germany
| | - Tobias Unruh
- Institute for Crystallography and Structural Physics, Friedrich-Alexander-University Erlangen-Nürnberg, Staudtstraße 3, 91058, Erlangen, Germany
- Center for Nanoanalysis and Electron Microscopy, Friedrich-Alexander-University Erlangen-Nürnberg, Cauerstraße 6, 91058, Erlangen, Germany
| | - Dirk Zahn
- Computer Chemistry Center, Friedrich-Alexander-University Erlangen-Nürnberg, Nägelsbachstraße 25, 91052, Erlangen, Germany
| | - Marcus Halik
- Organic Materials and Devices, Friedrich-Alexander-University Erlangen-Nürnberg, Cauerstraße 3, 91058, Erlangen, Germany
| | - Dirk M Guldi
- Department Chemistry and Pharmacy, Interdisciplinary Center for Molecular Materials (ICMM), Friedrich-Alexander-University Erlangen-Nürnberg, Egerlandstraße 3, 91058, Erlangen, Germany
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Bodappa N, Ren H, Dong JC, Wu DY, Tian ZQ, Li JF. Solvent-Limited Ion-Coupled Electron Transfer and Monolayer Thiol Stability in Au144
Cluster Films. ChemElectroChem 2018. [DOI: 10.1002/celc.201801191] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Nataraju Bodappa
- MOE Key Laboratory of Spectrochemical Analysis and Instrumentation State Key Laboratory of Physical Chemistry of Solid Surfaces i ChEM, College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
| | - He Ren
- MOE Key Laboratory of Spectrochemical Analysis and Instrumentation State Key Laboratory of Physical Chemistry of Solid Surfaces i ChEM, College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
| | - Jin-Chao Dong
- MOE Key Laboratory of Spectrochemical Analysis and Instrumentation State Key Laboratory of Physical Chemistry of Solid Surfaces i ChEM, College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
| | - De-Yin Wu
- MOE Key Laboratory of Spectrochemical Analysis and Instrumentation State Key Laboratory of Physical Chemistry of Solid Surfaces i ChEM, College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
| | - Zhong-Qun Tian
- MOE Key Laboratory of Spectrochemical Analysis and Instrumentation State Key Laboratory of Physical Chemistry of Solid Surfaces i ChEM, College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
| | - Jian-Feng Li
- MOE Key Laboratory of Spectrochemical Analysis and Instrumentation State Key Laboratory of Physical Chemistry of Solid Surfaces i ChEM, College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
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