XAFS studies of monodisperse Au nanoclusters formation in the etching process

16th International Conference on X-ray Absorption Fine Structure

Yang, Lina^1 ; Huang, Ting^1 ; Liu, Wei^1 ; Bao, Jie^1 ; Huang, Yuanyuan^1 ; Cao, Yuanjie^1 ; Yao, Tao^1 ; Sun, Zhihu^1 ; Wei, Shiqiang^1

National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui

230029, China^1

关键词: Cluster formations;    Controllable synthesis;    Formation mechanism;    Intermediate specie;    Metastable intermediate;    Precursor clusters;    Stable structures;    Synthetic chemistry;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/712/1/012035/pdf
DOI  :  10.1088/1742-6596/712/1/012035

来源: IOP

【 摘 要 】

Understanding the formation mechanism of gold nanoclusters is essential to the development of their synthetic chemistry. Here, by using x-ray absorption fine-structure (XAFS) spectroscopy, UV-Vis and MS spectra, the formation process of monodisperse Au13nanoclusters is investigated. We find that a critical step involving the formation of smaller Au8-Au11metastable intermediate clusters induced by the HCl + HSR etching of the polydisperse Aunprecursor clusters occurs firstly. Then these intermediate species undergo a size-growth to Au13cores, followed by a slow structure rearrangement to reach the final stable structure. This work enriches the understanding of cluster formation chemistry and may guide the way towards the design and the controllable synthesis of nanoclusters.