title: Selective sulfuration at the corner sites of a silver nanocrystal and its use in stabilization of the shape.
abstract: This paper describes a new approach to site-selective sulfuration at the corner sites of Ag nanocrystals including triangular nanoplates and nanocubes. The reaction simply involved mixing an aqueous suspension of the Ag nanocrystals with an aqueous solution of polysulfide at room temperature. As a precursor to elemental S, polysulfide is highly soluble in water and can directly react with elemental Ag upon contact to generate Ag(2)S in the absence of oxygen. The reaction was easily initiated at the corner sites and then pushed toward the center. By controlling the reaction time and/or the amount of polysulfide added, the reaction could be confined to the corner sites only, generating Ag-Ag(2)S hybrid nanocrystals with greatly improved stability against aging at 80 and 100 °C in air than their counterparts made of pure Ag.
authors.affiliation: Department of Biomedical Engineering, Washington University, St. Louis, Missouri 63130, United States.
authors.forename: Jie
authors.initials: J
authors.lastname: Zeng
authors.forename: Jing
authors.initials: J
authors.lastname: Tao
authors.forename: Dong
authors.initials: D
authors.lastname: Su
authors.forename: Yimei
authors.initials: Y
authors.lastname: Zhu
authors.forename: Dong
authors.initials: D
authors.lastname: Qin
authors.forename: Younan
authors.initials: Y
authors.lastname: Xia
mesh_terms: D053768:Metal Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology; D010316:Particle Size; D012834:Silver / Q000737:chemistry*; D018030:Silver Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D013455:Sulfur / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D018030:Silver Compounds; D012834:Silver; D013455:Sulfur; C013251:silver sulfide