title: Adding two active silver atoms on Au₂₅ nanoparticle.
abstract: Alloy nanoparticles with atomic monodispersity is of importance for some fundamental research (e.g., the investigation of active sites). However, the controlled preparation of alloy nanoparticles with atomic monodispersity has long been a major challenge. Herein, for the first time a unique method, antigalvanic reduction (AGR), is introduced to synthesize atomically monodisperse Au25Ag2(SC2H4Ph)18 in high yield (89%) within 2 min. Interestingly, the two silver atoms in Au25Ag2(SC2H4Ph)18 do not replace the gold atoms in the precursor particle Au25(SC2H4Ph)18 but collocate on Au25, which was supported by experimental and calculated results. Also, the two silver atoms are active to play roles in stabilizing the alloy nanoparticle, triggering the nanoparticle fluorescence and catalyzing the hydrolysis of 1,3-diphenylprop-2-ynyl acetate.
authors.affiliation: Key Laboratory of Materials Physics, Anhui Key Laboratory of Nanomaterials and Nanostructures, Institute of Solid State Physics, Chinese Academy of Sciences , Hefei 230031, China.
authors.forename: Chuanhao
authors.initials: C
authors.lastname: Yao
authors.forename: Jishi
authors.initials: J
authors.lastname: Chen
authors.forename: Man-Bo
authors.initials: MB
authors.lastname: Li
authors.forename: Liren
authors.initials: L
authors.lastname: Liu
authors.forename: Jinlong
authors.initials: J
authors.lastname: Yang
authors.forename: Zhikun
authors.initials: Z
authors.lastname: Wu
keywords: Alloy; active sites; antigalvanic reduction; atomic monodispersity; fluorescence; nanoparticles