Controlling Aggregation-Induced Emission in Bimetallic Gold-Copper Nanoclusters via Surface Motif Engineering

被引:34
作者
Chakraborty, Sikta [1 ]
Bain, Dipankar [2 ]
Maity, Subarna [1 ]
Kolay, Sarita [1 ]
Patra, Amitava [1 ,2 ]
机构
[1] Indian Assoc Cultivat Sci, Sch Mat Sci, Kolkata 700032, India
[2] Inst Nano Sci & Technol, Mohali 140306, India
关键词
AU(I)-THIOLATE COMPLEXES; METAL NANOCLUSTERS; ELECTRON-TRANSFER; CLUSTERS; SILVER; LUMINESCENCE; NANOPARTICLES; PH; SPECTROSCOPY; INSIGHTS;
D O I
10.1021/acs.jpcc.1c10237
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Aggregation-induced emission (AIE) has been significantly explored to enhance luminescence properties. Here, we synthesized bimetallic AuCu nanoclusters (NCs) and studied their AIE by reconstructing the surface motif from -SAu(I)S Au(I)S to -SAu(I)SCu(I)S, as evident from X-ray photoelectron spectroscopy (XPS) and microscopy studies. A significant blue shift in the emission band of Au NCs is observed with the change of the Au/Cu molar ratio. We observed enormous emission enhancement with decreasing temperature due to suppression of the intramolecular motion of surface ligands. A 200-fold emission enhancement occurs due to the aggregation of ultrasmall-sized AuCu NCs in a less polar medium of the waterethanol mixture. An increase in the radiative rate supports the effect of the Au(I)Cu(I) metallophilic interaction. A decrease in the nonradiative rate confirms the restriction of ligand motions in the aggregated state. Metal cluster-based AIE-type materials pave the way to design highly luminescent materials for potential applications in sensing, biolabeling, light-emitting diodes (LEDs), and other fields.
引用
收藏
页码:2896 / 2904
页数:9
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