scholarly journals A “Turn-On” Fluorescence Copper Biosensor Based on DNA Cleavage-Dependent Graphene Oxide-dsDNA-CdTe Quantum Dots Complex

Sensors ◽  
2018 ◽  
Vol 18 (8) ◽  
pp. 2605 ◽  
Author(s):  
Liyun Ding ◽  
Bing Xu ◽  
Tao Li ◽  
Jun Huang ◽  
Wei Bai
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Dna Cleavage ◽  
Copper Ions ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Cdte Quantum Dots ◽  
Turn On ◽  
Cdte Qds ◽  
Transmission Electron

A novel “turn-on” fluorescent copper biosensor is developed successfully based on the graphene oxide (GO)-dsDNA-CdTe quantum dots (QDs) complex via chemical crosslink method. The optical and structure properties of GO-dsDNA-CdTe QDs complex are studied by fluorescence (FL) spectra and transmission electron microscopy (TEM) in detail. It is demonstrated that the fluorescence quenching of CdTe QDs is a process of fluorescence resonance energy transfer (FRET) due to the essential surface and quenching properties of two-dimensional GO. Copper ions induce the catalytic reaction of DNA chain and irreversibly break at the cleavage site, which will cause the G-quadruplex formation, moreover further result in the CdTe QDs separated from GO and restored its fluorescence. Therefore, a significant recovery effect on the fluorescence of the GO-dsDNA-CdTe QDs complex is observed in the presence of copper ions. The fluorescence responses are concentration-dependent and can be well described by a linear equation. Compared with other metal ions, the sensor performs good selectivity for copper ions.

A biosensing platform for sensitive detection of concanavalin A based on fluorescence resonance energy transfer from CdTe quantum dots to graphene oxide

2015 ◽  
Vol 39 (8) ◽  
pp. 6092-6098 ◽  
Author(s):  
Yan Li ◽  
Fanping Shi ◽  
Nan Cai ◽  
Xingguang Su
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Energy Transfer ◽  
Fluorescence Resonance Energy Transfer ◽  
Concanavalin A ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Cdte Quantum Dots ◽  
Sensitive Detection ◽  
Sandwich Method

The sandwich method can detect different lectins simply by exchanging the carbohydrates functionalized on the quantum dots and graphene oxide.

In situ manipulation of fluorescence resonance energy transfer between quantum dots and monolayer graphene oxide by laser irradiation

Nanoscale ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 1236-1244 ◽  
Author(s):  
Wenjun He ◽  
Chengbing Qin ◽  
Zhixing Qiao ◽  
Yani Gong ◽  
Xiaorong Zhang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Energy Transfer ◽  
Laser Irradiation ◽  
Fluorescence Resonance Energy Transfer ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Monolayer Graphene ◽  
Fluorescence Resonance

Fluorescence resonance energy transfer between CdSeTe/ZnS quantum dots and monolayer graphene oxide is in situ manipulated by laser irradiation.

Photoinduced energy transfer in dye encapsulated polymer nanoparticle–CdTe quantum dot light harvesting assemblies

2015 ◽  
Vol 2 (1) ◽  
pp. 60-67 ◽  
Author(s):  
Simanta Kundu ◽  
Santanu Bhattacharyya ◽  
Amitava Patra
Keyword(s):  
Quantum Dots ◽  
Energy Transfer ◽  
Quantum Dot ◽  
Light Harvesting ◽  
Nile Red ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Cdte Quantum Dots ◽  
Cdte Quantum Dot ◽  
Red Dye

The efficient resonance energy transfer from CdTe quantum dots (donors) to Nile Red dye (acceptor) encapsulated PMMA nanoparticles for light harvesting is described.

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