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

Bo Peng; Liu Xi Zheng; Pan Yue Wang; Jia Feng Zhou; Meng Ding; Hao Di Sun; Bing Qian Shan; Kun Zhang

doi:10.3389/fchem.2021.756993

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

Bo Peng
, Liu Xi Zheng
, Pan Yue Wang
, Jia Feng Zhou
, Meng Ding
, Hao Di Sun
, Bing Qian Shan^*
, Kun Zhang^*

^*Corresponding author for this work

School of Chemistry and Molecular Engineering

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

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.

Original language	English
Article number	756993
Journal	Frontiers in Chemistry
Volume	9
DOIs	https://doi.org/10.3389/fchem.2021.756993
State	Published - 27 Sep 2021

Keywords

Bimetallic nanoclusters
Dual-emission
Structural water molecules
nanoscale interface
pH ratiometric sensing

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10.3389/fchem.2021.756993

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@article{e18b196db7974e08885b24f8885ecf73,

title = "Physical Origin of Dual-Emission of Au–Ag Bimetallic Nanoclusters",

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{\textquoteright}s shift.",

keywords = "Bimetallic nanoclusters, Dual-emission, Structural water molecules, nanoscale interface, pH ratiometric sensing",

author = "Bo Peng and Zheng, \{Liu Xi\} and Wang, \{Pan Yue\} and Zhou, \{Jia Feng\} and Meng Ding and Sun, \{Hao Di\} and Shan, \{Bing Qian\} and Kun Zhang",

note = "Publisher Copyright: {\textcopyright} Copyright {\textcopyright} 2021 Peng, Zheng, Wang, Zhou, Ding, Sun, Shan and Zhang.",

year = "2021",

month = sep,

day = "27",

doi = "10.3389/fchem.2021.756993",

language = "英语",

volume = "9",

journal = "Frontiers in Chemistry",

issn = "2296-2646",

publisher = "Frontiers Media SA",

}

TY - JOUR

T1 - Physical Origin of Dual-Emission of Au–Ag Bimetallic Nanoclusters

AU - Peng, Bo

AU - Zheng, Liu Xi

AU - Wang, Pan Yue

AU - Zhou, Jia Feng

AU - Ding, Meng

AU - Sun, Hao Di

AU - Shan, Bing Qian

AU - Zhang, Kun

PY - 2021/9/27

Y1 - 2021/9/27

N2 - 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.

AB - 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.

KW - Bimetallic nanoclusters

KW - Dual-emission

KW - Structural water molecules

KW - nanoscale interface

KW - pH ratiometric sensing

UR - https://www.scopus.com/pages/publications/85116885433

U2 - 10.3389/fchem.2021.756993

DO - 10.3389/fchem.2021.756993

M3 - 文章

AN - SCOPUS:85116885433

SN - 2296-2646

VL - 9

JO - Frontiers in Chemistry

JF - Frontiers in Chemistry

M1 - 756993

ER -

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

Abstract

Keywords

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