المؤلفون: Otomalo, Tadele, Di Mario, Lorenzo, Hamon, Cyrille, Constantin, Doru, Do, Khanh-Van, O'Keeffe, Patrick, Catone, Daniele, Paladini, Alessandra, Palpant, Bruno

المصدر: Advanced Optical Materials, Wiley, 2021, pp.2001778

مصطلحات موضوعية: Physics - Optics

الوصف: Noble metal nanoparticles exhibit localized plasmon resonance modes that span the visible and near-infrared spectral ranges and have many applications. Modifying the size, shape, and composition of the nanoparticles changes the number of modes and their properties. The characteristics of these modes are transiently affected when illuminating the nano-objects with ultrashort laser pulses. Here, we synthesize core-shell gold-silver nanocuboids and measure their spectral signature in the stationary and ultrafast transient regimes. Their dipolar transverse mode vanishes with increasing Ag-shell thickness, while higher-order modes grow in the near-ultraviolet range where no plasmon resonance can be generated with single noble metal nanoparticles. These higher-energy modes are associated with sharp spectral variations of the ultrafast transient light extinction by the bimetallic nanocuboids. By carrying out a theoretical investigation, we break down the different contributions to this response and

الوصول الحر: http://arxiv.org/abs/2103.01554Test

المؤلفون: Gluchko, Sergei, Palpant, Bruno, Volz, Sebastian, Braive, Rémy, Antoni, Thomas

مصطلحات موضوعية: Physics - Optics, Physics - Applied Physics

الوصف: We detect thermally excited surfaces waves on a submicron SiO 2 layer, including Zenneck and guided modes in addition to Surface Phonon Polaritons. The measurements show the existence of these hybrid thermal-electromagnetic waves from near-(2.7 $\mu$m) to far-(11.2 $\mu$m) infrared. Their propagation distances reach values on the order of the millimeter, several orders of magnitude larger than on semi-infinite systems. These two features, spectral broadness and long range propagation, make these waves good candidates for near-field applications both in optics and thermics due to their dual nature.
Comment: Applied Physics Letters, American Institute of Physics, 2017

الوصول الحر: http://arxiv.org/abs/1707.02752Test

المؤلفون: Ju, Shenghong, Palpant, Bruno, Chalopin, Yann

المصدر: J. Phys. Chem. C 121, 13474 (2017)

مصطلحات موضوعية: Physics - Chemical Physics

الوصف: The ability of metallic nanoparticles to supply heat to a liquid environment under exposure to an external optical field has attracted growing interest for biomedical applications. Controlling the thermal transport properties at a solid-liquid interface then appears to be particularly relevant. In this work, we address the thermal transport between water and a gold surface coated by a polymer layer. Using molecular dynamics simulations, we demonstrate that increasing the polymer density displaces the domain resisting to the heat flow, while it doesn't affect the final amount of thermal energy released in the liquid. This unexpected behavior results from a trade-off established by the increasing polymer density which couples more efficiently with the solid but initiates a counterbalancing resistance with the liquid.

الوصول الحر: http://arxiv.org/abs/1703.03548Test

المؤلفون: Mitiche, Sarra, Gueffrache, Syrine, Marguet, Sylvie, Audibert, Jean-Frédéric, Pansu, Robert Bernard, 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), Laboratoire Edifices Nanométriques (LEDNA), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), Institut Rayonnement Matière de Saclay (DRF) (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (DRF) (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS), Photophysique et Photochimie Supramoléculaires et Macromoléculaires (PPSM), Institut de Chimie - CNRS Chimie (INC-CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Ecole Normale Supérieure Paris-Saclay (ENS Paris Saclay), Plan Cancer (n◦17CP077–00, project HEPPROS), ANR-10-LABX-0035,Nano-Saclay,Paris-Saclay multidisciplinary Nano-Lab(2010)

المصدر: ISSN: 2050-750X ; Journal of materials chemistry‎ B ; https://cea.hal.science/cea-03510551Test ; Journal of materials chemistry‎ B, 2022, 10, pp.589-597. ⟨10.1039/D1TB02207E⟩ ; http://dx.doi.org/10.1039/D1TB02207ETest.

مصطلحات موضوعية: [CHIM.MATE]Chemical Sciences/Material chemistry

الوصف: International audience ; Gold nanoparticles can produce reactive oxygen species (ROS) under the action of ultrashort pulsed light. While beneficial for photodynamic therapy, this phenomenon is prohibitive for other biomedical applications such as imaging, photo-thermal drug release, or targeted gene delivery. Here, ROS are produced in water by irradiating gold nanorods and silica-coated gold nanorods with near-infrared femtosecond laser pulses and are detected using two fluorescent probes. Our results demonstrate that a dense silica shell around gold nanorods inhibits the formation of singlet oxygen (1O2) and hydroxyl radical (OH•) efficiently. The silica coating prevents the Dexter energy transfer between the nanoparticles and 3O2, stopping thus the generation of 1O2. In addition, numerical simulations accounting for the use of ultrashort laser pulses show that the plasmonic field enhancement at the nanoparticle vicinity is lessened once adding the silica layer. With the multiphotonic ejection of electrons being also blocked, all the possible pathways for ROS production are hindered by adding the silica shell around gold nanorods, making them safer for a range of biomedical developments.

العلاقة: cea-03510551; https://cea.hal.science/cea-03510551Test; https://cea.hal.science/cea-03510551/documentTest; https://cea.hal.science/cea-03510551/file/Mitiche%20et%20al_2022_preprint.pdfTest

الإتاحة: https://doi.org/10.1039/D1TB02207ETest
https://cea.hal.science/cea-03510551Test
https://cea.hal.science/cea-03510551/documentTest
https://cea.hal.science/cea-03510551/file/Mitiche%20et%20al_2022_preprint.pdfTest

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⟩.

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.

العلاقة: hal-03673269; https://hal.science/hal-03673269Test; https://hal.science/hal-03673269/documentTest; https://hal.science/hal-03673269/file/chemosensors-10-00193.pdfTest

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

المؤلفون: Rashidi-Huyeh, Majid, Volz, Sebastian, Palpant, Bruno

مصطلحات موضوعية: Condensed Matter - Materials Science

الوصف: We present a numerical model allowing to determine the electron and lattice temperature dynamics in a gold nanoparticle under subpicosecond pulsed excitation, as well as that of the surrounding medium. For this, we have used the electron-phonon coupling equation in the particle with a source term linked with the laser pulse, and the ballistic-diffusive equations for heat conduction in the host medium. Our results show that the heat transfer rate from the particle to the matrix is significantly smaller than the prediction of Fourier's law. Consequently, the particle temperature rise is much larger and its cooling dynamics is much slower than that obtained using Fourier's law, which is attributed to the nonlocal and nonequilibrium heat conduction in the vicinity of the nanoparticle. These results are expected to be of great importance for interpreting pump-probe experiments performed on single nanoparticles or nanocomposite media.

الوصول الحر: http://arxiv.org/abs/0806.1613Test

المؤلفون: Rashidi-Huyeh, Majid, Volz, Sebastian, Palpant, Bruno

مصطلحات موضوعية: Condensed Matter - Materials Science

الوصف: Relaxation dynamics of embedded metal nanoparticles after ultrafast laser pulse excitation is driven by thermal phenomena of different origins the accurate description of which is crucial for interpreting experimental results: hot electron gas generation, electron-phonon coupling, heat transfer to the particle environment and heat propagation in the latter. Regardingthis last mechanism, it is well known that heat transport in nanoscale structures and/or at ultrashort timescales may deviate from the predictions of the Fourier law. In these cases heat transport may rather be described by the Boltzmann transport equation. We present a numerical model allowing us to determine the electron and lattice temperature dynamics in a spherical gold nanoparticle core under subpicosecond pulsed excitation, as well as that of the surrounding shell dielectric medium. For this, we have used the electron-phonon coupling equation in the particle with a source term linked with the laser pulse absorption, and the ballistic-diffusive equations for heat conduction in the host medium. Either thermalizing or adiabatic boundary conditions have been considered at the shell external surface. Our results show that the heat transfer rate from the particle to the matrix can be significantly smaller than the prediction of Fourier's law. Consequently, the particle temperature rise is larger and its cooling dynamics might be slower than that obtained by using Fourier's law. This difference is attributed to the nonlocal and nonequilibrium heat conduction in the vicinity of the core nanoparticle. These results are expected to be of great importance for analyzing pump-probe experiments performed on single nanoparticles or nanocomposite media.

الوصول الحر: http://arxiv.org/abs/0806.1622Test

المؤلفون: Palpant, Bruno, Guillet, Yannick, Rashidi-Huyeh, Majid, Prot, Dominique

مصطلحات موضوعية: Physics - Optics, Condensed Matter - Other Condensed Matter, Physics - Classical Physics

الوصف: The optical response of materials based on gold nanoparticle assemblies depends on many parameters regarding both material morphology and light excitation characteristics. In this paper, the interplay between the optical and thermal responses of such media is particularly investigated under its theoretical aspect. Both conventional and original modeling approaches are presented and applied to concrete cases. We first show how the interaction of light with matrix-embedded gold nanoparticles can result in the generation of thermal excitations through different energy exchange mechanisms. We then describe how thermal processes can affect the optical response of a nanoparticle assembly. Finally, we connect both aspects and point out their involvement in the nonlinear optical response of nanocomposite media. This allows us to tackle two key issues in the field of third-order nonlinear properties of gold nanoparticles: The influence of the generalized thermal lens in the long laser pulse regime and the hot electron contribution to the gold particle intrinsic third-order susceptibility, including its spectral dispersion and intensity-dependence. Additionally, we demonstrate the possible significant influence of the heat carrier ballistic regime and phonon rarefaction in the cooling dynamics of an embedded gold nanoparticle subsequent to ultrafast pulsed laser excitation.
Comment: submitted to Gold Bull., 34 pages

الوصول الحر: http://arxiv.org/abs/0804.2739Test

المؤلفون: Łaszewski, Henryk, J, Palpant, Bruno, Buckle, Malcolm, Nogues, Claude

المساهمون: Laboratoire de biologie et pharmacologie appliquée (LBPA), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Ecole Normale Supérieure Paris-Saclay (ENS Paris Saclay), 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), H.J.L. acknowledges the funding support from the University of Paris-Saclay through the Initiative Doctorale Interdisciplinaire fellowship.

المصدر: ISSN: 2576-6422 ; ACS Applied Bio Materials ; https://hal.science/hal-04341805Test ; ACS Applied Bio Materials, 2021, 4 (6), pp.4753-4759. ⟨10.1021/acsabm.0c01522⟩.

مصطلحات موضوعية: gold nanorods, CTAB, functionalization, DNA, FRET, [SDV]Life Sciences [q-bio], [CHIM]Chemical Sciences, [PHYS]Physics [physics], [SPI]Engineering Sciences [physics]

الوصف: International audience ; Gold nanorods (GNRs) can be functionalized with multiple biomolecules allowing efficient cell targeting and delivery into specific cells. However, various issues have to be addressed prior to any clinical applications. They involve controlled biofunctionalization to be able to deliver a known dose of drug by immobilizing a known number of active molecules to GNRs while protecting their surface from degradation. The most widely used synthesis method of GNRs is seedmediated growth. It requires the use of cetyltrimethylammonium bromide (CTAB) that acts as a strong capping agent stabilizing the colloidal solution. The problem is that not only is CTAB cytotoxic to most cells but it also induces the sequestration of biomolecules in solution during the functionalization steps of GNRs. The presence of CTAB therefore makes it difficult to control the immobilization of biomolecules to GNRs while removing CTAB from the colloidal solution, leading to the aggregation of GNRs. The sequestration effect of ssDNA in solution by CTAB was studied in detail as a function of the CTAB concentration and the nature of the solution (water or buffer) using Forster resonance energy transfer as a detection tool. The conditions in which DNA sequestration did and did not occur could be clearly defined. Using gel electrophoresis, we could demonstrate how strongly the ssDNA sequestration effect in solution impacts the GNR surface biofunctionalization.

العلاقة: hal-04341805; https://hal.science/hal-04341805Test; https://hal.science/hal-04341805/documentTest; https://hal.science/hal-04341805/file/acsabm.0c01522.pdfTest

الإتاحة: https://doi.org/10.1021/acsabm.0c01522Test
https://hal.science/hal-04341805Test
https://hal.science/hal-04341805/documentTest
https://hal.science/hal-04341805/file/acsabm.0c01522.pdfTest

المؤلفون: Mitiche, Sarra, Audibert, Jean-Frédéric, Marguet, Sylvie, Palpant, Bruno, Pansu, Robert Bernard

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), Photophysique et Photochimie Supramoléculaires et Macromoléculaires (PPSM), Institut de Chimie - CNRS Chimie (INC-CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Ecole Normale Supérieure Paris-Saclay (ENS Paris Saclay), Laboratoire Edifices Nanométriques (LEDNA), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), Institut Rayonnement Matière de Saclay (DRF) (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (DRF) (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS), "Plan Cancer" managed by French ITMO Cancer (N°17CP077-00), Project HEPPROS, ANR-10-LABX-0035,Nano-Saclay,Paris-Saclay multidisciplinary Nano-Lab(2010)

المصدر: ISSN: 1010-6030.

مصطلحات موضوعية: Singlet Oxygen Sensor Green (SOSG), Singlet oxygen, Reactive Oxygen Species (ROS), Surface plasmon resonance, CTAB, Fluorescent sensor, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, [CHIM.ANAL]Chemical Sciences/Analytical chemistry

الوصف: International audience ; Singlet Oxygen Sensor Green (SOSG) is the most widely used fluorescent probe for detecting singlet oxygen (1O2). 1O2 can be efficiently produced by exciting the surface plasmon of gold nanoparticles with laser pulses. However, gold nanoparticles are usually embedded in a chemical stabilizer that can interact with SOSG, leading to erroneous detection of 1O2. This article shows that the emission properties of SOSG strongly depend on the concentration of cetyltrimethylammonium bromide (CTAB), a capping agent widely used for nanoparticles synthesis and stabilization. The sensitivity of SOSG to 1O2 is also drastically affected by the presence of CTAB. This effect is due to the fluorescent probe's aggregation in CTAB premicellar aggregates and micelles, and the emergence of fluorescent conformers of the probe in the micelles. Furthermore, the behavior of SOSG in the presence of two other widely-used capping agents, i.e., citrate and Polyethylene Glycol (PEG), is investigated to determine the right nanoparticle stabilizer to use with SOSG probe.

العلاقة: hal-03154664; https://hal.science/hal-03154664Test; https://hal.science/hal-03154664/documentTest; https://hal.science/hal-03154664/file/Article.pdfTest

الإتاحة: https://doi.org/10.1016/j.jphotochem.2021.113170Test
https://hal.science/hal-03154664Test
https://hal.science/hal-03154664/documentTest
https://hal.science/hal-03154664/file/Article.pdfTest