Tracking the Motion of Lanthanide Ions within Core–Shell–Shell NaYF4 Nanocrystals via Resonance Energy Transfer

2020 ◽  
Vol 124 (20) ◽  
pp. 11229-11238 ◽  
Author(s):  
Philipp U. Bastian ◽  
Selma Nacak ◽  
Vladimir Roddatis ◽  
Michael U. Kumke
Keyword(s):  
Energy Transfer ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Lanthanide Ions ◽  
Core Shell

scholarly journals Resonance Energy Transfer to Track the Motion of Lanthanide Ions—What Drives the Intermixing in Core-Shell Upconverting Nanoparticles?

Biosensors ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 515
Author(s):  
Philipp U. Bastian ◽  
Nathalie Robel ◽  
Peter Schmidt ◽  
Tim Schrumpf ◽  
Christina Günter ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Bulk Material ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Lanthanide Ions ◽  
Shell Structures ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Acceptor Concentration ◽  
Host Lattices

The imagination of clearly separated core-shell structures is already outdated by the fact, that the nanoparticle core-shell structures remain in terms of efficiency behind their respective bulk material due to intermixing between core and shell dopant ions. In order to optimize the photoluminescence of core-shell UCNP the intermixing should be as small as possible and therefore, key parameters of this process need to be identified. In the present work the Ln(III) ion migration in the host lattices NaYF4 and NaGdF4 was monitored. These investigations have been performed by laser spectroscopy with help of lanthanide resonance energy transfer (LRET) between Eu(III) as donor and Pr(III) or Nd(III) as acceptor. The LRET is evaluated based on the Förster theory. The findings corroborate the literature and point out the migration of ions in the host lattices. Based on the introduced LRET model, the acceptor concentration in the surrounding of one donor depends clearly on the design of the applied core-shell-shell nanoparticles. In general, thinner intermediate insulating shells lead to higher acceptor concentration, stronger quenching of the Eu(III) donor and subsequently stronger sensitization of the Pr(III) or the Nd(III) acceptors. The choice of the host lattice as well as of the synthesis temperature are parameters to be considered for the intermixing process.

Aptamer-modified sensitive nanobiosensors for the specific detection of antibiotics

2020 ◽  
Vol 8 (37) ◽  
pp. 8607-8613
Author(s):  
Ying Zhang ◽  
Bo Duan ◽  
Qing Bao ◽  
Tao Yang ◽  
Tiancheng Wei ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Energy Transfer ◽  
Fluorescence Resonance Energy Transfer ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Upconversion Nanoparticles ◽  
Core Shell ◽  
Specific Detection ◽  
Energy Donor ◽  
Energy Acceptor

A highly selective, fluorescence resonance energy transfer (FRET) based aptasensor for enrofloxacin (ENR) detection was developed using core–shell upconversion nanoparticles as an energy donor and graphene oxide as an energy acceptor.

scholarly journals Förster Resonance Energy Transfer between Core/Shell Quantum Dots and Bacteriorhodopsin

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Mark H. Griep ◽  
Eric M. Winder ◽  
Donald R. Lueking ◽  
Gregory A. Garrett ◽  
Shashi P. Karna ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Energy Transfer ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Separation Distance ◽  
Forster Resonance Energy Transfer ◽  
Förster Resonance Energy Transfer ◽  
Core Shell ◽  
Energy Transfer Mechanism ◽  
Förster Resonance

An energy transfer relationship between core-shell CdSe/ZnS quantum dots (QDs) and the optical protein bacteriorhodopsin (bR) is shown, demonstrating a distance-dependent energy transfer with 88.2% and 51.1% of the QD energy being transferred to the bR monomer at separation distances of 3.5 nm and 8.5 nm, respectively. Fluorescence lifetime measurements isolate nonradiative energy transfer, other than optical absorptive mechanisms, with the effective QD excited state lifetime reducing from 18.0 ns to 13.3 ns with bR integration, demonstrating the Förster resonance energy transfer contributes to 26.1% of the transferred QD energy at the 3.5 nm separation distance. The established direct energy transfer mechanism holds the potential to enhance the bR spectral range and sensitivity of energies that the protein can utilize, increasing its subsequent photocurrent generation, a significant potential expansion of the applicability of bR in solar cell, biosensing, biocomputing, optoelectronic, and imaging technologies.

scholarly journals Fluorescence sensing of cyanide anions based on Au-modified upconversion nanoassemblies

The Analyst ◽  
2021 ◽  
Author(s):  
Chunning Sun ◽  
Michael Gradzielski
Keyword(s):  
Energy Transfer ◽  
Fluorescence Resonance Energy Transfer ◽  
Au Nanoparticles ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Upconversion Nanoparticles ◽  
Core Shell ◽  
Fluorescence Sensing ◽  
Sensitivity And Selectivity ◽  
Fluorescence Resonance

Fluorescence resonance energy transfer (FRET)-based upconversion nanoprobes were designed by assembling Au nanoparticles on core–shell-structured upconversion nanoparticles, showing excellent sensitivity and selectivity toward cyanide ions sensing.

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