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Fabrication de nanocomposites assistée par résonance plasmon de systèmes métal/chromophores – PhotoPlasm

Submission summary

The project developed around L. BALAN, specialized in the synthesis and characterization of metal nanoparticles (MNPs) and in photomaterials. L. BALAN and J.P. MALVAL, who is currently working on specific interactions between chromophores and MNPs, constitute the core of the project team. R. SCHNEIDER will bring his proficiency in organic synthesis and develop original synthetic routes for the preparation of thiol-modified chromophores and study the effect of spacers to generate specific MNP/chromophore interactions. Although not appearing as a full-partner, the LETI group of CEA will play an important part in the characterization of the nanostructures. L. FREY will carry out calculations on the spatial distribution of plasmon field around MNPs and place the single particle characterization equipments to the disposal of the project. Metal nanoparticles (MNPs) raised great scientific interest during the past decade because of their attractive properties that open up new vistas in the fields of catalysis, optics, magnetism and micro- and nano-electronics. Thus, the development of new synthetic routes to generate MNPs with controlled shape [DPG-PHOTON] and functionalized with chromophores [DPCR-Nancy] will be the first objective of this project. Indeed, surface modification of MNPs can open new perspectives in nanomaterials synthesis because the topology of local plasmon field which is, a priori, anisotropic can induce a photoselection of electronic transitions in the associated chromophore. The photonic interaction of MNPs with grafted chromophore is expected to depend on many parameters (intrinsic photophysical properties of the chromophores, distance and orientation with respect to the field orientation, specific macrocage effects'). Investigating on the photochemical behavior of MNP-chromophore assemblies will constitute the second objective of the project [DPG-PMP]. The local field in the immediate vicinity of MNPs and its efficient absorption by grafted chromophores will markedly enhance the photochemical reactivity of the prepared nanostructures. The third objective will be to turn these effects to account in nanofabrication applications [DPG-PHOTON]. Surface plasmons generated through illumination of MNPS behave like light sources the size of which is far below the wavelength used to create them. By using such sources, it is possible to confine the reaction volume and to obtain nanosized polymer objects. By this means, we will produce hybrid nanocomposite (a MNP with a nanometric polymer shell) and the influence of this organic shell on the optical and photonic properties of the NMPs will be studied. Moreover, this process will allow the spatial distribution of the plasmon and its enhancement factor around any type of MNP to be determined. In this case the polymerizable material is used as a 'recording' material. The synthesis of metal nanoparticles, hybrid metal particle-organic shell systems and polymer nanocomposites and the study of the physicochemical properties of these nanomaterials are new research topics in the PHOTON group whose interests concentrate on micro- and nanofabrication. Thus, combining the unique nano excitation properties of plasmons on metal nanoparticles with organized fluorophores at their periphery should open new vistas in nanosciences and nanotechnology. The wide variety of properties that can be implemented in MNPs/photopolymer systems should initiate flourishing collaborations with the community of nanophotonics.

Project coordination

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

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Beginning and duration of the scientific project: - 0 Months

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