A selective determination of copper ions in water samples based on the fluorescence quenching of thiol-capped CdTe quantum dots

Luminescence ◽  
2015 ◽  
Vol 31 (2) ◽  
pp. 515-522 ◽  
Author(s):  
Piyaluk Nurerk ◽  
Proespichaya Kanatharana ◽  
Opas Bunkoed
Keyword(s):  
Quantum Dots ◽  
Fluorescence Quenching ◽  
Water Samples ◽  
Copper Ions ◽  
Cdte Quantum Dots ◽  
Selective Determination ◽  
Determination Of Copper

UV-emitting polyelectrolyte-modified MoS2 quantum dots for selective determination of nitrophenol in water samples based on inner filter effect

2020 ◽  
Vol 98 (5) ◽  
pp. 222-227
Author(s):  
Keke Ning ◽  
Guoqiang Xiang ◽  
Cuicui Wang ◽  
Jingxing Wang ◽  
Xiaohong Qiao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Water Samples ◽  
Sodium Molybdate ◽  
Inner Filter Effect ◽  
Pond Water ◽  
Emission Peak ◽  
Selective Determination ◽  
Uv Emission ◽  
Filter Effect

In this work, poly(sodium 4-styrenesulfonate) (PSS) modified molybdenum disulfide quantum dots (MoS2-PSS QDs) were synthesized via a simple hydrothermal method using l-cysteine and anhydrous sodium molybdate as precursors and PSS as a modification reagent, and a selective and sensitive fluorescent sensing method for the determination of p-nitrophenol (p-NP) based on their UV emission was developed. The obtained MoS2-PSS QDs have an obvious UV emission peak (390 nm) with quantum yield of 5.13%. The strong absorption peak of p-NP at 400 nm has large spectral overlap with the UV emission peak (390 nm) of MoS2-PSS QDs. Because of this p-NP absorption, the fluorescence of MoS2-PSS QDs at 390 nm is quenched with the introduction of p-NP via the inner filter effect (IFE) and the decreased fluorescence intensity was linearly proportional to the p-NP concentration in the range of 1–20 μmol/L, leading to a detection limit of 0.13 μmol/L for p-NP. The MoS2 QDs-based fluorescent probe for p-NP is sensitive and selective and was successfully applied in the determination of p-NP in the pond water samples with satisfactory results.

Ratiometric fluorescent paper sensor utilizing hybrid carbon dots–quantum dots for the visual determination of copper ions

Nanoscale ◽  
2016 ◽  
Vol 8 (11) ◽  
pp. 5977-5984 ◽  
Author(s):  
Yahui Wang ◽  
Cheng Zhang ◽  
Xiaochun Chen ◽  
Bo Yang ◽  
Liang Yang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Dots ◽  
Copper Ions ◽  
Paper Sensor ◽  
Hybrid Carbon ◽  
Determination Of Copper

Determination of iron in biodiesel based on fluorescence quenching of CdTe quantum dots

Fuel ◽  
2014 ◽  
Vol 117 ◽  
pp. 520-527 ◽  
Author(s):  
S. Sofia M. Rodrigues ◽  
Adriana S. Lima ◽  
Leonardo S.G. Teixeira ◽  
Maria das Graças A. Korn ◽  
João L.M. Santos
Keyword(s):  
Quantum Dots ◽  
Fluorescence Quenching ◽  
Cdte Quantum Dots
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