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Insitu generation of gold/silver nanoparticles on PDMS substrates at RT : towards the plasmonic modulation of emitters’ intensity

PHD CHEMISTRY, STARTING FALL 2019, BORDEAUX, FRANCE

We have put very recently forward that it is possible to generate at room temperature Au/Ag nanoparticles (NPs) with potentially tunable morphology and organization at the surface of weakly crosslinked (and textured) PDMS elastomers. During the first stage of the PhD work, we would like to study deeper this new concept and fully characterize the impact of the various parameters controlling the morphology, organization, concentration and final equilibrium (wetting vs. elasticity) of these NPs within the PDMS matrix. Beyond the different morphological and surface characterizations (AFM, MEB, SEM, wetting ...), the optical characterization will be performed in order to test the use of such systems in practical sensing applications related to plasmonics. In a second stage, the optical signature of such plasmonic nano-objects will thus be measured trough UV-VIS spectroscopy and time and spatially resolved optical spectroscopy as well. The objective is to produce such metallic islands close to each other, so as to generate a strong plasmonic coupling between them. By stretching in and out the PDMS slab, the interdistances between the NPs will vary. Playing this game reversibly, we can produce a plasmonic spectral modulator or switch. By insertion of luminescent emitters into the PDMS matrix the PDMS stretch modulation will in turn modulate the amplitude and matching of the plasmonic resonance with the absorption/emission spectra of the emitters, thereby producing an optical switch / modulator in intensity based on these luminescent emitters.

Profile student : Physico-chimie des colloïdes et/ou polymères - Matière molle - Science des matériaux - Chimie - Formulation.

Financement : Bourse ministérielle

PLEASE CONTACT (CV) :
- Jean-Paul Chapel
Centre de Recherche Paul Pascal (CRPP) UMR 5031
115 Av Schweitzer, 33600 Pessac, FRANCE ;
E-mail : Jean-Paul Chapel ; Tél : 05 56 84 56 73

- Renaud Vallée
Centre de Recherche Paul Pascal (CRPP) UMR 5031
115 Av Schweitzer, 33600 Pessac, FRANCE ;
E-mail : Renaud Vallée ; Tél : 05 56 84 30 04