Hailiang Zhang, Jing Wang, Wenxiu Han and Pei Jiang
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引用次数: 0
Abstract
Au25(SG)18 (SG: glutathione) nanoclusters, characterized by their atomically precise structures, exhibit near-infrared II (NIR-II) fluorescence emission and excellent biocompatibility, making them highly promising for imaging applications. However, their comparatively low photoluminescence quantum yield (QY) in aqueous solutions limits their further development. In this study, taking advantage of the molecular-like properties of Au25(SG)18 nanoclusters, we employ a Schiff base reaction to improve their NIR-II emission for the first time. The formation of a Schiff base chemical bond restricts intramolecular motion of surface ligands on the Au25(SG)18 nanoclusters, reduces the nonradiative rate, and increases the radiative transition rate. Consequently, the luminescence quantum yield of PDA-Au25(SG)18 (PDA: 2,6-pyridinedicarboxaldehyde) nanoclusters is enhanced to 3.26%. Moreover, the reaction between amino and aldehyde groups occurs at the single cluster level, ensuring that these PDA-Au25(SG)18 nanoclusters remain discrete with an ultrasmall size of 2.6 nm, facilitating rapid excretion via the renal system and also showing excellent photostability and biocompatibility.
期刊介绍:
Nanoscale is a high-impact international journal, publishing high-quality research across nanoscience and nanotechnology. Nanoscale publishes a full mix of research articles on experimental and theoretical work, including reviews, communications, and full papers.Highly interdisciplinary, this journal appeals to scientists, researchers and professionals interested in nanoscience and nanotechnology, quantum materials and quantum technology, including the areas of physics, chemistry, biology, medicine, materials, energy/environment, information technology, detection science, healthcare and drug discovery, and electronics.