Generalizable Organic-to-Aqueous Phase Transfer of a Au₁₈ Nanocluster with Luminescence Enhancement and Robust Photocatalysis in Water

High Resolution Image Download MS PowerPoint Slide For the majority of gold nanoclusters (NCs), their water insolubility, low photoluminescence (PL) intensity, and less understood photostability are three critical factors that limit their application in the biomedical and photocatalysis fields. In this study, we report a polymer wrapping method for phase transfer of organic soluble NCs into aqueous phase without degrading the electronic and optical properties, and such materials are further demonstrated for robust photocatalysis in water. We first synthesized a Au 18 (DMBT) 14 NC (DMBT = 2,4-dimethylbenzenethiolate) and found that the aromatic ligands confer a greatly enhanced antioxidation capability of the NC compared to the Au 18 (CHT) 14 counterpart (CHT = cyclohexanethiolate), with the critical role of aromatic ligand interactions identified by X-ray crystallography. The organic soluble Au 18 (DMBT) 14 was successfully transferred into the aqueous phase by an amphiphilic polymer (Pluronic F127, abbrev. F127) wrapping method, producing Au 18 -D@F127 nanoparticles [each containing a few NCs; Au 18 -D is an abbreviation for Au 18 (DMBT) 14 ] with a 10-fold enhancement in PL intensity, and similar results were also obtained for Au 18 (CHT) 14 . This method is broadly applicable to various NCs, rendering their water solubility and significantly enhancing the PL intensity of otherwise weakly emissive gold NCs. The exceptional antioxidation stability of Au 18 (DMBT) 14 enables the application of Au 18 -D@F127 NPs for the photocatalytic activation of persulfate ions and subsequent photodegradation of water pollutants efficiently.