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Large-scale self-assembled plasmonic templates for enhanced spectroscopy

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Defense Thèse de doctorat : Univ. Genève, 2016 - Sc. 4906 - 2016/03/02
Abstract Bottom-up approaches are widely used in preparation of high density nanoparticle assemblies since they can offer cost-effectivity and versatility for production of large-scale templates. Taking advantage of intense near field at plasmonic metal nanoparticles or in gaps between them resulting from localized surface plasmon resonances enables us to enhance spectroscopic signals particularly Raman and fluorescence. Several effects depend on the nanoscale distances. First, the plasmon band tuning and electric field strength directly depend on the nanoparticles gap size. Second, the spectral overlap of plasmon resonance and reporter molecule is also important. Moreover in fluorescence spectroscopy, fluorescence quenching is directly affected by metal-fluorophore distances. Therefore, overall distance control at nanoscale was considered as a main objective of this research. We used bottom-up techniques such as seed-mediated growth and layer by layer deposition. The prepared tunable and large-scale plasmonic templates gave promising results in enhanced spectroscopy.
Keywords PlasmonicsBottom-up fabricationLayer-by-layerGold nanoparticlesPolyelectrolytesSelf-assemblyPlasmonic templatesSERSFluorescence enhancementTwisted silica structuresPorous silica
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URN: urn:nbn:ch:unige-824047
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Research group Groupe Bürgi
Project University of Geneva
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CHEKINI, Mahshid. Large-scale self-assembled plasmonic templates for enhanced spectroscopy. Université de Genève. Thèse, 2016. https://archive-ouverte.unige.ch/unige:82404

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Deposited on : 2016-04-06

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