bimetallic nanoclusters
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2022 ◽  
Vol 174 ◽  
pp. 107048
Author(s):  
Xiupei Yang ◽  
Jing Yang ◽  
Maoxue Zhang ◽  
Ya Wang ◽  
Baowen Zhang ◽  
...  

Author(s):  
Shraddha Borse ◽  
Zagabathuni Venkata Panchakshari Murthy ◽  
Tae-Jung Park ◽  
Suresh Kumar Kailasa

2021 ◽  
Vol 9 ◽  
Author(s):  
Bo Peng ◽  
Liu-Xi Zheng ◽  
Pan-Yue Wang ◽  
Jia-Feng Zhou ◽  
Meng Ding ◽  
...  

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.


NANO ◽  
2021 ◽  
pp. 2150114
Author(s):  
Yucong Fan ◽  
Weihua Yu ◽  
Yue Hu ◽  
Yunwen Liao ◽  
Xiaohui Jiang ◽  
...  

Doping Ag-enhanced and glutathione-stabilized Au nanoclusters (GSH–Ag/AuNCs) were prepared by the one-step ultraviolet radiation combined with microwave heating method. The effects of the molar ratio of Au–Ag and different types of energy suppliers on the fluorescent performance of GSH–Ag/AuNCs were studied in detail. After that, a new ratio fluorescent probe (RF-probe) based on the mixing of GSH–Ag/AuNCs with carbon dots (CDs) was designed for sensitive and selective determination of copper gluconate (CG) and cupric sulfate (CS). For the CDs–GSH–Ag/AuNCs RF-probe, the fluorescence (FL) of CDs (at 440[Formula: see text]nm) and that of alloy nanoclusters (NCs) (at 605[Formula: see text]nm) were, respectively, unaffected and strongly quenched in the presence of CG/CS at [Formula: see text][Formula: see text]nm coming from the dynamic quenching process. Corresponding linear ranges and limit of detection (LOD) of the RF-probe for the CG/CS assay were estimated to be 0.17–6.20/0.17–5.62[Formula: see text][Formula: see text]mol/L and 16.80/15.95[Formula: see text]nmol/L, respectively. Furthermore, the proposed RF-probe was successfully used for the assays of CG in CG tablets and CG additive, and CS in infant formula and CS additive, respectively.


2021 ◽  
pp. 113611
Author(s):  
Yi Pan ◽  
Xinlin Wei ◽  
Xiaodong Guo ◽  
Hui Wang ◽  
Haiyun Song ◽  
...  

2021 ◽  
Author(s):  
Po Peng ◽  
Liu-Xi Zheng ◽  
Pan-Yue Wang ◽  
Jia-Feng Zhou ◽  
Meng Ding ◽  
...  

2021 ◽  
Vol 288 ◽  
pp. 120001
Author(s):  
Yamei Huang ◽  
Peiyao Du ◽  
Wen-Xiong Shi ◽  
Ye Wang ◽  
Shuang Yao ◽  
...  

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