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Mechanical Coupling in Gold Nanoparticles Supermolecules Revealed by Plasmon-Enhanced Ultralow Frequency Raman Spectroscopy

2016

International audience; Acoustic vibrations of assemblies of gold nanoparticles were investigated using ultralow frequency micro-Raman scattering and finite element simulations. When exciting the assemblies resonantly with the surface plasmon resonance of electromagnetically coupled nano-particles, Raman spectra present an ultralow frequency band whose frequency lies below the lowest Raman active Lamb mode of single nanoparticles that was observed. This feature was ascribed to a Raman vibration mode of gold nanoparticle " supermolecules " , that is, nanoparticles mechanically coupled by surrounding polymer molecules. Its measured frequency is inversely proportional to the nanoparticle diame…

Materials scienceFrequency bandLambAnalytical chemistryNanoparticlePhysics::OpticsBioengineering02 engineering and technologygold NPs dimermechanical properties010402 general chemistry01 natural sciencesMolecular physicsVibrationsymbols.namesakeGeneral Materials SciencePhysics::Atomic PhysicsSurface plasmon resonanceRamanPlasmonchemistry.chemical_classification[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics][ PHYS.PHYS.PHYS-OPTICS ] Physics [physics]/Physics [physics]/Optics [physics.optics]ScatteringMechanical EngineeringBrillouinGeneral ChemistryPolymer021001 nanoscience & nanotechnologyCondensed Matter Physics0104 chemical scienceschemistryColloidal goldsymbols0210 nano-technologyRaman spectroscopy

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