دورية أكاديمية
Acoustic Vibration Modes of Gold-Silver Core-Shell Nanoparticles
| العنوان: | Acoustic Vibration Modes of Gold-Silver Core-Shell Nanoparticles |
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| المؤلفون: | Otomalo, Tadele, Di Mario, Lorenzo, Hamon, Cyrille, Constantin, Doru, Toschi, Francesco, Do, Khanh-Van, Juvé, Vince, Ruello, Pascal, O'Keeffe, Patrick, Catone, Daniele, Paladini, Alessandra, Palpant, Bruno |
| المساهمون: | Laboratoire Lumière, Matière et Interfaces (LuMIn), CentraleSupélec-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Ecole Normale Supérieure Paris-Saclay (ENS Paris Saclay), Institut des Molécules et Matériaux du Mans (IMMM), Le Mans Université (UM)-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS), Istituto di Struttura della Materia (CNR-ISM), National Research Council of Italy, Laboratoire de Physique des Solides (LPS), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) |
| المصدر: | ISSN: 2227-9040 ; Chemosensors ; https://hal.science/hal-03673269Test ; Chemosensors, 2022, 10 (5), pp.193. ⟨10.3390/chemosensors10050193⟩. |
| بيانات النشر: | HAL CCSD MDPI |
| سنة النشر: | 2022 |
| مصطلحات موضوعية: | plasmonics, bimetallic nanoparticles, ultrafast, vibration modes, acousto-plasmonic coupling, transient absorption, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics] |
| الوصف: | International audience ; Bimetallic Au/Ag core–shell cuboid nanoparticles (NPs) exhibit a complex plasmonic response dominated by a dipolar longitudinal mode and higher-order transverse modes in the near-UV, which may be exploited for a range of applications. In this paper, we take advantage of the strong signature of these modes in the NP ultrafast transient optical response, measured by pump-probe transient absorption (TA) spectroscopy, to explore the NP vibrational landscape. The fast Fourier transform analysis of the TA dynamics reveals specific vibration modes in the frequency range 15–150 GHz, further studied by numerical simulations based on the finite element method. While bare Au nanorods exhibit extensional and breathing modes, the bimetallic NPs undergo more complex motions, involving the displacement of facets, edges and corners. The amplitude and frequency of these modes are shown to depend on the Ag shell thickness, as the silver load modifies the NP aspect ratio and mass. Moreover, the contributions of the vibrational modes to the experimental TA spectra are shown to vary with the probe laser wavelength at which the signal is monitored. Using the combined simulations of the NP elastic and optical properties, we elucidate this influence by analyzing the effect of the mechanisms involved in the acousto-plasmonic coupling. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | hal-03673269; https://hal.science/hal-03673269Test; https://hal.science/hal-03673269/documentTest; https://hal.science/hal-03673269/file/chemosensors-10-00193.pdfTest |
| DOI: | 10.3390/chemosensors10050193 |
| الإتاحة: | https://doi.org/10.3390/chemosensors10050193Test https://hal.science/hal-03673269Test https://hal.science/hal-03673269/documentTest https://hal.science/hal-03673269/file/chemosensors-10-00193.pdfTest |
| حقوق: | info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.695E541E |
| قاعدة البيانات: | BASE |
| DOI: | 10.3390/chemosensors10050193 |
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