Visualized ratiometric fluorescence sensing system for copper ions based on gold nanoclusters/perovskite quantum dot @SiO2 nanocomposites

The Analyst ◽  
2021 ◽  
Author(s):  
Wanying Xue ◽  
Jiangyan Zhong ◽  
Haishan Wu ◽  
Jianhua Zhang ◽  
Yuwu Chi
Keyword(s):  
Quantum Dot ◽  
Metal Ions ◽  
Environmental Pollution ◽  
Copper Ions ◽  
Gold Nanoclusters ◽  
Ratiometric Fluorescence ◽  
Fluorescence Sensing ◽  
Sensing System ◽  
Sio2 Nanocomposites ◽  
Ratiometric Fluorescence Sensing

Excessive copper ions (Cu2+)cause serious environmental pollution and even endanger the health of organisms. Fluorescence chemosensing materials are widely used in the detection of metal ions due to their simple...

Ratiometric fluorescence sensing of sugars via a reversible disassembly and assembly of the peptide aggregates mediated by sugars

2014 ◽  
Vol 50 (44) ◽  
pp. 5854-5857 ◽  
Author(s):  
Lok Nath Neupane ◽  
Song Yee Han ◽  
Keun-Hyeung Lee
Keyword(s):  
Aqueous Solutions ◽  
Phenylboronic Acid ◽  
Ratiometric Fluorescence ◽  
Fluorescence Sensing ◽  
Ratiometric Sensing ◽  
Sensing System ◽  
Ratiometric Fluorescence Sensing ◽  
Monomer Form

An amphiphilic dipeptide (1) bearing pyrene and phenylboronic acid was demonstrated as a unique example of a ratiometric sensing system for sugars by reversibly converting the peptide aggregates into the monomer form of the complex with sugars in aqueous solutions.

Dual-emissive gold nanoclusters for label-free and separation-free ratiometric fluorescence sensing of 4-nitrophenol based on the inner filter effect

2018 ◽  
Vol 6 (18) ◽  
pp. 5033-5038 ◽  
Author(s):  
Tong Shu ◽  
Jianxing Wang ◽  
Xiangfang Lin ◽  
Ziping Zhou ◽  
Feng Liang ◽  
...  
Keyword(s):  
Fluorescent Sensor ◽  
Gold Nanoclusters ◽  
Fluorescence Emission ◽  
Inner Filter Effect ◽  
Label Free ◽  
Ratiometric Fluorescence ◽  
Blue Fluorescence ◽  
Fluorescence Sensing ◽  
Filter Effect ◽  
Ratiometric Fluorescence Sensing

A ratiometric fluorescent sensor based on 4-nitrophenol-induced selective quenching of the blue fluorescence emission of the diTyr residues of the GNCs@BSA via the inner filter effect.

scholarly journals An Investigation on Design and Characterization of a Highly Selective LED Optical Sensor for Copper Ions in Aqueous Solutions

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1099
Author(s):  
Sheng-Chun Hung ◽  
Chih-Cheng Lu ◽  
Yu-Ting Wu
Keyword(s):  
Aqueous Solutions ◽  
Metal Ions ◽  
Copper Ions ◽  
Incident Light ◽  
Copper Ion ◽  
Intensity Change ◽  
Optical Absorbance ◽  
Sensing System ◽  
Optic Sensor ◽  
Cu Ions

The optical characteristics of copper ion detection, such as the photometric absorbance of specific wavelengths, exhibit significant intensity change upon incident light into the aqueous solutions with different concentrations of metal ions due to the electron transition in the orbit. In this study, we developed a low-cost, small-size and fast-response photoelectric sensing prototype as an optic sensor for copper (Cu) ions detection by utilizing the principle of optical absorption. We quantified the change of optical absorbance from infra-red (IR) light emitting diodes (LEDs) upon different concentrations of copper ions and the transmitted optical signals were transferred to the corresponding output voltage through a phototransistor and circuit integrated in the photoelectric sensing system. The optic sensor for copper (Cu) ions demonstrated not only excellent specificity with other metal ions such as cadmium (Cd), nickel (Ni), iron (Fe) and chloride (Cl) ions in the same aqueous solution but also satisfactory linearity and reproducibility. The sensitivity of the preliminary sensing system for copper ions was 29 mV/ppm from 0 to 1000 ppm. In addition, significant ion-selective characteristics and anti-interference capability were also observed in the experiments by the proposed approach.

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