Details

Autor(en) / Beteiligte

• Galchenko, Michael
• Schuster, Raphael
• Black, Andres
• Riedner, Maria
• Klinke, Christian

Titel

Preparation of high-yield and ultra-pure Au25 nanoclusters: towards their implementation in real-world applicationsElectronic supplementary information (ESI) available. See DOI: 10.1039/c8nr08200f

Erscheinungsjahr

2019-01

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Colloidal approaches allow for the synthesis of Au nanoclusters (NCs) with atomic precision and sizes ranging from a few to hundreds of atoms. In most of the cases, these processes involve a common strategy of thiol etching of initially polydisperse Au nanoparticles into atomically precise NCs, resulting in the release of Au-thiolate complexes as byproducts. To the best of our knowledge, neither the removal of these byproducts nor the mass spectra in the relevant mass region were shown in previous studies. A thorough analysis of inorganic byproducts in the synthesis of [Au 25 (PPh 3 ) 10 (PET) 5 X 2 ] 2+ NC, abbreviated as Au 25 NC, reveals that published protocols lead to Au 25 NCs in vanishingly small quantities compared to their byproducts. Three purification methods are presented to separate byproducts from the desired Au 25 NCs which are proposed to be applicable to other promising Au NC systems. Additionally, critical factors for a successful synthesis of Au 25 NCs are identified and discussed including the role of residual water. An important finding is that the etching duration is very critical and must be monitored by UV-Vis spectroscopy resulting in synthetic yields as high as 40%. Colloidal approaches allow for the synthesis of Au nanoclusters (NCs) with atomic precision and sizes ranging from a few to hundreds of atoms.