Physical Origin of Dual-Emission of Au–Ag Bimetallic Nanoclusters

Peng, Bo and Zheng, Liu-Xi and Wang, Pan-Yue and Zhou, Jia-Feng and Ding, Meng and Sun, Hao-Di and Shan, Bing-Qian and Zhang, Kun (2021) Physical Origin of Dual-Emission of Au–Ag Bimetallic Nanoclusters. Frontiers in Chemistry, 9. ISSN 2296-2646

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Abstract

On the origin of photoluminescence of noble metal NCs, there are always hot debates: metal-centered quantum-size confinement effect VS ligand-centered surface state mechanism. Herein, we provided solid evidence that structural water molecules (SWs) confined in the nanocavity formed by surface-protective-ligand packing on the metal NCs are the real luminescent emitters of Au-Ag bimetal NCs. The Ag cation mediated Au-Ag bimetal NCs exhibit the unique pH-dependent dual-emission characteristic with larger Stokes shift up to 200 nm, which could be used as potential ratiometric nanosensors for pH detection. Our results provide a completely new insight on the understanding of the origin of photoluminescence of metal NCs, which elucidates the abnormal PL emission phenomena, including solvent effect, pH-dependent behavior, surface ligand effect, multiple emitter centers, and large-Stoke’s shift.

Item Type: Article
Subjects: European Scholar > Chemical Science
Depositing User: Managing Editor
Date Deposited: 13 Feb 2023 09:14
Last Modified: 03 Oct 2024 04:40
URI: http://article.publish4promo.com/id/eprint/669

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