title: Dynamic study on the transformation process of gold nanoclusters.
abstract: In this paper, the transformation process from Au8 to Au25 nanoclusters (NCs) is investigated with steady state fluorescence spectroscopy and time-resolved fluorescence spectroscopy at various reaction temperatures and solvent diffusivities. Results demonstrate that Au8 NCs, protected by bovine serum albumin, transform into Au25 NCs under controlled pH values through an endothermic reaction with the activation energy of 74 kJ mol(-1). Meanwhile, the characteristic s-shaped curves describing the formation of Au25 NCs suggest this process involves a diffusion controlled growth mechanism.
authors.affiliation: Research Centre for Applied Science, Academia Sinica, Taipei, Taiwan.
authors.forename: Xiaoqian
authors.initials: X
authors.lastname: Ma
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Wen
authors.forename: Yon-Rui
authors.initials: YR
authors.lastname: Toh
authors.forename: Kuo-Yen
authors.initials: KY
authors.lastname: Huang
authors.forename: Jau
authors.initials: J
authors.lastname: Tang
authors.forename: Pyng
authors.initials: P
authors.lastname: Yu
mesh_terms: D000818:Animals; D002417:Cattle; D004058:Diffusion; D006046:Gold / Q000737:chemistry*; D006801:Humans; D049329:Nanostructures / Q000737:chemistry*; D012710:Serum Albumin, Bovine / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013696:Temperature
chemical_list: D012710:Serum Albumin, Bovine; D006046:Gold