A novel core-satellite CdTe/Silica/Au NCs hybrid sphere as dual-emission ratiometric fluorescent probe for Cu2+

Metal Nanoclusters: Applications in Environmental Monitoring and Cancer Therapy

“…A novel fluorescence assay for intracellular Cu 2+ using BSA-Au NCs has been demonstrated [68], with the sensing mechanism being based on fluorescence quenching, because of the binding affinity of Cu 2+ with BSA, rather than the metallophilic interaction for Hg 2+ sensing, and their fluorescence being recoverable by adding glycine. CdTe/Silica/Au NCs hybrid spheres have been recently developed as ratiometric fluorescence probes for the determination of Cu 2+ with high sensitivity and selectivity, which can be obtained through covalently linking BSA-Au NCs to the surface of the amino functionalized CdTe/SiO 2 spheres [69]. Other interference factors may also lead to fluorescence quenching and generate false positives in the turn-off assays.…”

Crown daisy leaf waste–derived carbon dots: A simple and green fluorescent probe for copper ion

“…In comparison with other detection techniques, fluorescence method has outstanding advantages such as simplicity, low cost, easy operation, and high sensitivity . So far, many kinds of fluorescent probe materials including organic molecule, nanoparticle, and semiconductor nanoparticles have been prepared for Cu 2+ detection; nevertheless, these fluorescent probes have disadvantages of requiring complicated synthetic produce, expensive raw materials, and potential high toxicity, which limited their fluorescence sensing applications.…”

“…[4][5][6] In comparison with other detection techniques, fluorescence method has outstanding advantages such as simplicity, low cost, easy operation, and high sensitivity. [7][8][9] So far, many kinds of fluorescent probe materials including organic molecule, 6 nanoparticle, 10,11 and semiconductor nanoparticles 12,13 have been prepared for Cu 2+ detection; nevertheless, these fluorescent probes have disadvantages of requiring complicated synthetic produce, expensive raw materials, and potential high toxicity, which limited their fluorescence sensing applications. Similar to other nanoparticles or semiconductor quantum dots, 14 fluorescence carbon dots (CDs) have also been widely researched as a high fluorescent probe because of their excellent photostability, low toxicity, and favorable biocompatibility.…”

Preparation of graphene quantum dots based core-satellite hybrid spheres and their use as the ratiometric fluorescence probe for visual determination of mercury(II) ions

“…Some other Cd chalcogenide QDsbased hybrid nanospheres have been hybridized by embedding the red-emitting CdTe QDs [9,15e17] or CdTe/CdS QDs [18] into silica nanoparticles and covalently linking the green-emitting one onto the silica surface. Following the "on-off" or "on-off-on" detection mode, these dual-emission hybrid probes with desired intensity ratios have been demonstrated to be promising for the visual detection of 5-fluorouracil [9], trinitrotoluene [15], cysteine/ homocysteine [16], Cu 2þ [17], and Hg 2þ [18]. Although these traditional QDs have great potential for the ratiometric fluorescence probes fabrication, certain limitations may restrict their practical use because those Cd-based QDs that are highly toxic to both cell and live animals due to their inherent chemical composition, size, shape, and surface [19e23].…”