Personal web page : http://iramis.cea.fr/Pisp/94/fabienne.testard.html
Laboratory link : http://iramis.cea.fr/nimbe/lions/
More : http://www.mpq.univ-paris-diderot.fr/?-microscopie-electronique-avancee-
Controlling the optical properties of Au nanoparticles requires mastering their shape during the fabrication processes. If a wide variety of nanoparticle shapes has been reported, recent attention has shifted towards the synthesis of Au nanostars (NSs) which provide an opportunity to expand the broadening horizon of applications of gold nano-objects. The distinguishing feature of Au NSs over other morphologies is the presence of arms with sharp tips that give rise to narrow and tuneable localized surface plasmon resonances (LSPRs) throughout the entire visible and near IR spectrum holding great promise for bio-imaging and therapeutic applications and surface enhanced Raman spectroscopy (SERS). Nevertheless, current synthetic methods have a limited control over the symmetry of gold NSs (i.e. variations in the distribution, number, length and shape of arms). This morphological arbitrariness makes the understanding of their optical properties inherently difficult and has detrimental effect on the reproducibility of their applications. This phD project aims at gaining control over the shape and stability of Au NSs, by exploiting unprecedented in situ liquid TEM and in situ SAXS insights on the growth and degradation processes of these complex nanostructures. The phD will be shared between two Laboratories: "le laboratoire des Matériaux et Phénomènes quantiques", CNRS at the Université Paris Diderot and "Le Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire" in NIMBE CNRS/CEA at CEA Saclay.