Metal ion induced fluorescence resonance energy transfer between crown ether functionalized quantum dots and rhodamine B: selectivity of K⁺ ion

Abstract

A ratiometric fluorescent metal ion sensor based on the mechanism of fluorescence resonance energy transfer between 15-crown-5-ether capped CdSe/ZnS quantum dots and 15-crown-5-ether attached rhodamine B.

A novel system for Fe3+ ion detection based on fluorescence resonance energy transfer

“…While the fluorescence peak at 432 nm was weaker than that of pure C120, the fluorescence peak at 506 nm was stronger than that of pure FL at the same excitation wavelength. This observation confirmed that the energy transfer between the two molecules was occurred [4]. After the presence of the energy transfer between the two molecules was determined, the effect of metal ions on the energy transfer was examined by using the fluorescence titration method [26].…”

“…There are many photo-physical processes such as photo-induced electron or charge transfer, fluorescence resonance energy transfer (FRET) and excimer formation, which are responsible for the photo-physical changes resulting from the binding of metal ions with fluorophores. FRET, with its promising selectivity and sensitivity, is the most remarkable of these processes [4][5][6][7].…”

Fluorescent nanoprobes for sensing and imaging of metal ions: Recent advances and future perspectives

“…On the other hand, functionalization of the QDs with metal ion-selective receptors reduces non-specific interactions. Furthermore, FRET-based sensors using QDs as energy donors were recently developed and applied for sensing of various metal ions [185-188], offering a fast, sensitive, and non-destructive method for metal ion measurement.…”

“…For instance, Chen et al [189] utilized thioglycerol-capped CdS QDs as an ion-selective probe to determine copper, zinc, and ferric ions in buffer solutions. Due to the effect on photoluminescence (PL) behaviors of QDs by metals ions, QDs have also been utilized as fluorescent probes for many metal ions, including K + [188], Ag + [190], Cd 2+ [191,192], Cu 2+ [193-200], Fe 2+ , Hg 2+ [187,201-207], Pb 2+ [208], Cr 3+ [209,210], Fe 3+ [211], Sb 3+ [212], Co 2+ [213], Ba 2+ [214], Ca 2+ and Ni 2+ [215]. Based on this principle of direct interaction of metal ions with QDs, the Zhu group [195] reported L-cysteine-capped NIR-emitting CdSeTe QDs for selective detection of Cu 2+ , with a LOD of 7.1 nM.…”

Organize Surfaktant Yapılar Varlığında Floresin ve Safranin-T Arasındaki Enerji Transferi

“…Aynı sonuçlar ters misel sistemlerde alınan ölçümlerde de gözlenmiştir (Şekil 4b). Bu durum iki molekül arasında bir enerji transferinin varlığını kanıtlamaktadır (Bozkurt et al 2015;Lee et al 2015). Bu sonuçlar ışığında enerji transferinin varlığı kanıtlandıktan sonra iki molekül arasındaki enerji transferine ters misel ve mikro-emülsiyon ortamların etkisi incelenmiştir.…”