关键字:ELECTRONIC-STRUCTURE;GOLD NANOCLUSTERS;SILVER;LUMINESCENCE;MICELLIZATION;NANOPARTICLES;CLUSTERS;BINDING
摘要:Hydrophobic and hydrophilic nanoclusters embody complementary superiorities. The means to
amalgamate these superiorities, i.e., the atomic precision of hydrophobic clusters and the water
dissolvability of hydrophilic clusters, remains challenging. This work presents a versatile strategy to
render hydrophobic nanoclusters water-soluble—the micellization of nanoclusters in the presence of
solvent-conjoined Na+ cations—which overcomes the above major challenge. Specifically, although
[Ag29(SSR)12(PPh3)4]
3 nanoclusters are absolutely hydrophobic, they show good dissolvability in aqueous
solution in the presence of solvent-conjoined Na+ cations (Na1(NMP)5 or Na3(DMF)12). Such cations act
as both counterions of these nanoclusters and surface cosolvent of cluster-based micelles in the
aqueous phase. A combination of DLS (dynamic light scattering) and aberration-corrected HAADF-STEM
(high angle annular dark field detector scanning transmission electron microscopy) measurements
unambiguously shows that the phase-transfer of hydrophobic Ag29 into water is triggered by the
micellization of nanoclusters. Owing to the excellent water solubility and stability of
[Ag29(SSR)12(PPh3)4]
3[Na1(NMP)5]3
+ in H2O, its performance in cell staining has been evaluated.
Furthermore, the general applicability of the micellization strategy has been verified. Overall, this work
presents a convenient and efficient approach for the preparation of cluster-based, biocompatible
nanomaterials.
卷号:11
期号:18
是否译文:否