title: Superior Oxygen Stability of N-Heterocyclic Carbene-Coated Au Nanocrystals: Comparison with Dodecanethiol.
abstract: The stability of Au nanocrystals (NCs) coated with different N-heterocyclic carbenes (NHCs) or dodecanethiol (DDT) to oxygen-based treatments was investigated. A dominant effect of the ligand type was observed with a significantly greater oxygen resistance of NHC-coated Au NCs compared to that of the thiol-based analogues. NHC-coated Au NCs are stable to 10 W oxygen plasma etching for up to 180 s whereas the integrity of DDT-coated Au NCs is strongly affected by the same treatment from 60-80 s. In the latter case, the average size of the NCs (from 2.6 to 6.3 nm) and the method of synthesis have no effect on the stability. NHC-coated Au NCs were found to generate of a smaller quantity of ligand-derived species under molecular oxygen treatment, which could account for the increased stability.
authors.affiliation: Sorbonne Universités , UPMC-Univ Paris 6, UMR 8233, MONARIS, F-75005 Paris, France.|CNRS, UMR 8233, MONARIS, F-75005 Paris, France.|Sorbonne Universités , UPMC-Univ Paris 6, UMR 8232, Institut Parisien de Chimie Moléculaire, F-75005 Paris, France.
authors.forename: Xiang
authors.initials: X
authors.lastname: Ling
authors.affiliation: Sorbonne Universités , UPMC-Univ Paris 6, UMR 8233, MONARIS, F-75005 Paris, France.|CNRS, UMR 8233, MONARIS, F-75005 Paris, France.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Schaeffer
authors.affiliation: Sorbonne Universités , UPMC-Univ Paris 6, UMR 8232, Institut Parisien de Chimie Moléculaire, F-75005 Paris, France.
authors.forename: Sylvain
authors.initials: S
authors.lastname: Roland
authors.affiliation: Sorbonne Universités , UPMC-Univ Paris 6, UMR 8233, MONARIS, F-75005 Paris, France.|CNRS, UMR 8233, MONARIS, F-75005 Paris, France.|CEA/IRAMIS, CEA Saclay, 91191 Gif-Sur-Yvette, France.
authors.forename: Marie-Paule
authors.initials: MP
authors.lastname: Pileni
mesh_terms: D006046:Gold / Q000737:chemistry*; D008697:Methane / Q000031:analogs & derivatives* / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: C030011:carbene; D006046:Gold; D008697:Methane; D010100:Oxygen