Notre site utilise des cookies nécessaires à son bon fonctionnement. Pour améliorer votre expérience, d’autres cookies peuvent être utilisés : vous pouvez choisir de les désactiver. Cela reste modifiable à tout moment via le lien Cookies en bas de page.


Université de Bordeaux
LabEx AMADEusCluster of Excellence
Cluster of excellence
 

AMADEus Seminar - Associate Prof. Gi-Ra Yi - Monday 30 october 2017 - 11:00 am CRPP (Amphi)

le lundi 30 octobre 2017 à 11h
AMADEus Seminar - Associate Prof. Gi-Ra Yi - Monday 30 october 2017 - 11:00 am CRPP (Amphi)

Gi-Ra Yi

School of Chemical Engineering

Sungkyunkwan University

Suwon, Republic of Korea

Ultrasmooth, highly spherical monocrystalline gold particles for precision plasmonics

Summary: Ultrasmooth, highly spherical monocrystalline gold particles were prepared by a cyclic process of slow growth followed by slow chemical etching, which selectively removes edges and vertices. The etching process effectively makes the surface tension isotropic, so that spheres are favored under quasi-static conditions. It is scalable up to particle sizes of 200 nm or more. The resulting spherical crystals display uniform scattering spectra and consistent optical coupling at small separations, even showing Fano-like resonances in small clusters. The high monodispersity of the particles we demonstrate should facilitate the self-assembly of nanoparticle clusters with uniform optical resonances, which could in turn be used to fabricate optical metafluids. Narrow size distributions are required to control not only the spectral features but also the morphology and yield of clusters in certain assembly schemes.

Figure dans les rubriques