ZnS:Mn nanoparticles functionalized by PAMAM-OH dendrimer based fluorescence ratiometric probe for cadmium

Ratiometric Fluorescent Silicon Quantum Dots–Ce6 Complex Probe for the Live Cell Imaging of Highly Reactive Oxygen Species

“…The quenching efficiency was approximately 50% at an • OH concentration of 200 μM, which demonstrates that the quenching effects mainly comes from • OH instead of H 2 O 2 . It has been reported that the active oxygen species of H 2 O 2 may contact the surface of the SiQDs, capture the electrons at the conduction bands of the SiQDs, and result in the inhibition of the radiative recombination of the photoinduced electrons and holes and the quenching of the SiQDs. , From our results, we infer that the quenching mechanism of • OH is similar to H 2 O 2 , but the quenching efficiency of • OH is much higher than that of H 2 O 2 . In addition, the fluorescence of Ce6 remains almost unchanged after the addition of Fe 2+ and H 2 O 2 separately or simultaneously (Figure d–f).…”

“…It has been reported that the active oxygen species of H 2 O 2 may contact the surface of the SiQDs, capture the electrons at the conduction bands of the SiQDs, and result in the inhibition of the radiative recombination of the photoinduced electrons and holes and the quenching of the SiQDs. 27,38 From our results, we infer that the quenching mechanism of O 2 ) can also be generated by Ce6 under the long time excitation of 670 nm light and enough oxygen environment, which is due to the photosensitive property of Ce6 as used in photodynamic therapy. To verify the possibility of Ce6 in ratiometric fluorescence probe, we conducted the experiments about how 1 O 2 affects the fluorescence intensity of silicon quantum dots and Ce6 at fluorescence measurement conditions.…”

Fluorescent sensor for Cr(VI) based in functionalized silicon quantum dots with dendrimers

“…In view of the above mentioned issues, we present an alternative pathway to obtain functionalized SiQDs, inspired in our previous experience with CdSe and ZnS:Mn QDs coated by different dendrimers which achieved results with C-Reactive Protein and Cd(II), respectively [38,39]. Hydroxyl terminated poly(amidoamine) dendrimer (PAMAM-OH) is one of the most used dendrimers with high adsorption capacity for some anions, as chromate, arsenate or phosphate [40].…”

Dendrimer Enhanced Fingerprint and Explosive Detection: A Critical Review

“…Briefly reported applications of dendrimers are in pharmaceuticals, [17][18][19][20][21][22][23][24] forensic science, [1][2][3][4][5][6][7][8][9]25] immunoassay and vaccines, [21,26] MRI contrast imaging, [27][28][29][30][31][32] drug delivery, [33][34][35][36][37] biochemical assay, [38][39][40] supramolecular chemistry, [41][42][43][44] electrochemistry, [45] catalyst, [46] sensors, [15,[47][48][49][50][51][52][53] environmental, [54][55]…”