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Scientific highlights

Plasmonic quantum size effects in silver nanoparticles are dominated by interfaces and local environments

Campos.jpg

The physical properties of metals change when their dimensions are reduced to the nano-scale and new phenomena such as the localized surface plasmon resonance (LSPR) appear. This collective electronic excitation can be tuned over a large spectral range by adapting the material, size and shape. The existing literature is as rich as it is controversial—for example, size-dependent spectral shifts of the LSPR in small metal nanoparticles, induced by quantum effects, are reported to the red, to the blue or entirely absent. Here we report how complementary experiments on size-selected small silver nanoparticles embedded in silica can yield inconsistent results on the same system: whereas optical absorption shows no size effect in the range between only a few atoms and ~10 nm, a clear spectral shift is observed in single-particle electron spectroscopy. Our quantitative interpretation, based on a mixed classical/quantum model, resolves the apparent contradictions, not only within our experimental data but also in the literature. Our comprehensive model describes how the local environment is the crucial parameter controlling the manifestation or absence of quantum size effects. Read more »

Self-hybridization within non-Hermitian localized plasmonic systems

Figure 1 : Left : Energy variation of two modes of silver nano-daggers as a function of the vertical arm length L. A clear anti-

In a recent paper published in Nature Physics, we show that electron energy loss spectroscopy in a scanning transmission electron microscope reveals the possibility for two eigenmodes from the same nanoparticle to hybridize – a physical effect that cannot be observed in day-to-day (Hermitian) linear physics Read more »

Publications

Faye, D.N., et al. Incorporation of Europium Into GaN Nanowires by Ion Implantation. The Journal of Physical Chemistry C (2019).doi:10.1021/acs.jpcc.8b12014
Tizei, L.H.G., et al. Monolayer and thin h –BN as substrates for electron spectro-microscopy analysis of plasmonic nanoparticles. Applied Physics Letters 113122, 231108 (2018). Download: PlamonsOnhBN_APL_2018 .pdf (1.13 MB)
Campos, A., et al. Plasmonic quantum size effects in silver nanoparticles are dominated by interfaces and local environments. Nature Physics (2018).doi:10.1038/s41567-018-0345-z Download: CNP.pdf (1.79 MB)
Lourenço-Martins, H., Das, P., Tizei, L.H.G., Weil, R. & Kociak, M. Self-hybridization within non-Hermitian localized plasmonic systems. Nature Physics 89, (2018). Download: LM2018.pdf (3.41 MB)
Gloter, A., et al. Atomically resolved mapping of EELS fine structures. Materials Science in Semiconductor Processing 65, 2 - 17 (2017). Download: 1-s2.0-S1369800116302165-main.pdf (5.7 MB)
Campos, A., et al. Plasmonic Breathing and Edge Modes in Aluminum Nanotriangles. ACS Photonics (2017).doi:10.1021/acsphotonics.7b00204 Download: Campos2017.pdf (5.45 MB)
Popova, E., et al. Interplay between epitaxial strain and low dimensionality effects in a ferrimagnetic oxide. Journal of Applied Physics 121, (2017). Download: Popova_JAP2017_Strain-STEM-GPA.pdf (4.49 MB)
Tizei, L.H.G. & Kociak, M. Advances in Imaging and Electron PhysicsQuantum Nanooptics in the Electron Microscope. (2017).doi:10.1016/bs.aiep.2017.01.002 Download: Tizei_Kociak_AIE.pdf (3.49 MB)
Mayer, M., et al. Controlled Living Nanowire Growth: Precise Control over the Morphology and Optical Properties of AgAuAg Bimetallic Nanowires. Nano Letters 150716113957008 (2015).doi:10.1021/acs.nanolett.5b01833 Download: Mayer.pdf (6.19 MB)
Arenal, R., et al. Atomic Configuration of Nitrogen-Doped Single-Walled Carbon Nanotubes. Nano Letters 14, 5509 - 5516 (2014).
Tizei, L.H.G., et al. A polarity-driven nanometric luminescence asymmetry in AlN/GaN heterostructures. Applied Physics Letters 105, 143106 (2014). Download: Tizei_GaNQWCLAsymmetry_APL_2014.pdf (1.74 MB)
Bourrellier, R., et al. Nanometric Resolved Luminescence in h-BN Flakes: Excitons and Stacking Order. ACS Photonics 1, (2014). Download: bourrellier-acs-photonics.pdf (7.37 MB)
Walls, M., et al. Identification of Ferrous-Ferric Fe3O4 Nanoparticles in Recombinant Human Ferritin Cages. Microscopy and Microanalysis 19, 835 - 841 (2013).
Yang, Z., Walls, M., Lisiecki, I. & Pileni, M.-P. Unusual Effect of an Electron Beam on the Formation of Core/Shell (Co/CoO) Nanoparticles Differing by Their Crystalline Structures. Chemistry of Materials 25, 2372 - 2377 (2013).
Cha, L., Lartigue-Korinek, S., Walls, M. & Mazerolles, L. Interface structure and chemistry in a novel steel-based composite Fe–TiB2 obtained by eutectic solidification. Acta Materialia 60, 6382 - 6389 (2012).
Chen, S.-Y., et al. Concentration Dependence of Oxygen Vacancy on the Magnetism of CeO 2 Nanoparticles. The Journal of Physical Chemistry C 116, 8707 - 8713 (2012).
Umek, P., et al. Local Coordination and Valence States of Cobalt in Sodium Titanate Nanoribbons. The Journal of Physical Chemistry C 116, 11357 - 11363 (2012).
Eswara Moorthy, S.K., Rousseau, O., Viret, M. & Kociak, M. Nanoscale Chemical and Structural Characterization of Transient Metallic Nanowires using Aberration-Corrected STEM-EELS. Nano Letters 12, 2732 - 2739 (2012). Download: nl204374v.pdf (1.74 MB)
Bocher, L., et al. Atomic and Electronic Structure of the BaTiO 3 /Fe Interface in Multiferroic Tunnel Junctions. Nano Letters 12, 376 - 382 (2012). Download: Bocher-Nanoletters12.pdf (2.76 MB)
Cavalier, M., Walls, M., Lisiecki, I. & Pileni, M.P. How Can the Nanocrystallinity of 7 nm Spherical Co Nanoparticles Dispersed in Solution Be Improved?. Langmuir 27, 5014–5020 (2011).
Trasobares, S., et al. Chemical Imaging at Atomic Resolution as a Technique To Refine the Local Structure of Nanocrystals. Angewandte Chemie-International Edition 50, 868–872 (2011). Download: Angew. Chem. Int. Ed. 2011 Trasobares.pdf (649.98 KB)
Valencia, S., et al. Interface-induced room-temperature multiferroicity in BaTiO3. Nature Materials 10, 753 - 758 (2011). Download: Valencia_NatMat11_XMCD-BTOFe.pdf (761.54 KB)
Garcia, V., et al. Ferroelectric Control of Spin Polarization. Science 327, 1106–1110 (2010). Download: Garcia_Science10_ferroelectric_LSMO-BTO-Fe.pdf (400.27 KB)
Rigutti, L., et al. Ultraviolet Photodetector Based on GaN/AlN Quantum Disks in a Single Nanowire. Nano Letters 10, 2939–2943 (2010).
Sefrioui, Z., et al. All-Manganite Tunnel Junctions with Interface-Induced Barrier Magnetism. Advanced Materials 22, 5029–+ (2010).
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