Communication Dans Un Congrès Année : 2024

Shedding light on gold nanoparticles that make molecules dance

Christophe Humbert

Résumé

Surfaces and interfaces play a vital role in Physics and Chemistry because they are the place where fundamentals reactions occur between molecules when two materials differing by their nature and/or their physical phase are in interaction. Vibrational spectroscopies such as IR and Raman are powerful nondestructive analysis tools of in situ chemistry at interfaces but may eventually suffer from their lack of intrinsic sensitivity to discriminate between “bulk” and “surface-adsorbed” molecules, particularly at the nanoscale for gold nanostructures. Nonlinear optics such as Two-Colour Sum-Frequency Generation (2C-SFG) spectroscopy offers a solution to overcome this issue. As showed in this presentation, after establishing the main principles governing this optical technique, we will see that 2C-SFG spectroscopy can be applied to address fundamental questions related to heterogeneous chemistry, interfacial electrochemistry, catalysis and chemical sensing, especially on metal [1] and semiconducting nanomaterials. In fact, the particular selection rules of this vibro-electronic spectroscopy takes profit of plasmonic [2] or excitonic electronic properties, making dance frantically the surrounding molecules through energy or electronic transfer from the nanomaterials, giving access to unique and complementary information with respect to the traditional optical investigation probes. Finally, computational methods based on DFT calculations or loop Feynman diagrams, these latter unifying optics and condensed matter physics [3], enlighten current and future fundamental questions related to functionalized metal and semiconducting hybrid nanosystems. References [1] Humbert, C., Noblet, T., Dalstein, L., Busson, B., Barbillon, G. Sum-Frequency Generation Spectroscopy of Plasmonic Nanomaterials: A Review. Materials 12 (2019) 836 [2] Dalstein, L., Humbert, C., Ben Haddada, M., Boujday, S., Barbillon, G., Busson, B. The Prevailing Role of Hotspots in Plasmon-Enhanced Sum-Frequency Generation Spectroscopy. The Journal of Physical Chemistry Letters 10 (2019) 7706 [3] Noblet, T., Busson, B., Humbert, C. Diagrammatic Theory of Linear and Non-Linear Optics for Composite Systems. Physical Review A 104 (2021) 063504

Humbert-abstract-or-nano-2024.pdf (633.7 Ko) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)
Licence

Dates et versions

hal-04928936 , version 1 (04-02-2025)

Identifiants

  • HAL Id : hal-04928936 , version 1

Citer

Christophe Humbert. Shedding light on gold nanoparticles that make molecules dance. 13th Conference Or-nano, GdR Or-nano, May 2024, Montpellier, France. ⟨hal-04928936⟩
53 Consultations
36 Téléchargements

Partager

  • More