Fluorescence enhancement of europium complexes by core–shell Ag@SiO2 nanoparticles

Lanthanide Fluorobenzoates as Bio‐Probes: a Quest for the Optimal Ligand Fluorination Degree

“…Though the luminescence occurs due to the lanthanide f–f levels, luminescent materials with tailored properties can be obtained by modifying the ligand structure. The influence of substituents was discussed in several publications, and the introduction of fluorine substituents, in particular, tends to increase the luminescence efficiency . As some of us have shown previously, ligand fluorination increases the solubility of lanthanide benzoates and reduces luminescent quenching, but decreases the thermodynamic stability of the carboxylates .…”

“…Thei nfluence of substituents wasd iscussed in several publications, [28][29][30] and the introduction of fluorines ubstituents, in particular,t ends to increaset he luminescence efficiency. [31][32][33][34][35] As some of us have shown previously,l igand fluorination increasest he solubility of lanthanide benzoates and reducesl uminescentq uenching, [36,37] but decreases the thermodynamics tability of the carboxylates. [5,[36][37][38][39][40] Thus, stable Eu benzoates show little luminescence, while perfluorobenzoates are luminescent butu nstable.…”

SPR‐enhanced fluorescence and protein‐improved blood compatibility of quadruple core/shell nanostructure of Ag@SiO2@Eu3+(tta)3Phen@Protein

“…In some studies, it revealed that encapsulating the metallic nanoparticles with a dielectric material (SiO 2 ) is a useful way to prohibit this electron transfer [14]. The thickness of 10–25 nm can achieve the most suitable fluorescence enhancement effect [18, 19]. Based on the core/shell structure of Ag@SiO 2 , Eu 3+ (tta) 3 Phen complex can further modify at the SiO 2 surface as the second shell, in which the fluorescence of Eu 3+ (tta) 3 Phen complex can be enhanced by the SPR effect of nanosilver [20, 21].…”

Study on the interaction of berberine with nucleic acids in the presence of silver nanoparticles, and the fluorometric determination of nucleic acids

“…Zhang et al proposed that regulating the distance from Eu-complexes to Ag surface by changing the shell thickness of Ag@SiO 2 could give 5.1-fold uorescence enhancements on the Eu-complexes. 20 The research team of Akbay reported that a 9-fold increase in the uorescence intensity was obtained when the thickness of poly(styrene sulfonate) and poly(allylamine hydrochloride) layer-by-layer assembly on aluminum nanostructured surface was at about 9 nm. 21 Zhang et al presented the quenched uorescence, causing by the adsorption of dye-labeled singlestranded DNA (ssDNA) on core-shell nanoparticles of Ag@poly(m-phenylenediamine), could be recovered by the desorption of ssDNA owing to its hybridization with target DNA.…”