A dual-emissive fluorescent sensor fabricated by encapsulating quantum dots and carbon dots into metal–organic frameworks for the ratiometric detection of Cu²⁺ in tap water

Abstract

A new ratiometric fluorescent sensor (QDs/CDs@ZIF-8) combining the advantages of ratiometry and MOFs was synthesized for Cu2+ detection.

Carbon Dots‐in‐Matrix Boosting Intriguing Luminescence Properties and Applications

“…As a new class of porous materials, MOFs constructed by metal ions/clusters and organic linkers exhibit diverse framework structures, high surface areas and variable pore sizes. Taking one classical MOF (ZIF‐8) as the host matrix, several CDs@ZIF‐8 composites were synthesized through a two‐step method during which CDs were first prepared via a microwave‐assisted method or a hydrothermal/solvothermal method, and then incorporated into the matrix by adding them into the reaction mixture of ZIF‐8 . Using a similar method, N,S‐doped CDs were encapsulated into a Eu‐MOF matrix .…”

“…Recently, unique room temperature phosphorescence (RTP) and DF behaviors have been discovered because the special surface groups on CDs (e.g., CN, CO) and the interactions between CDs (e.g., aggregation, crosslink‐enhanced emission) can stabilize the triplet states and promote intersystem crossing (ISC) . In particular, embedding or immobilizing CDs in various host matrices, such as polyvinyl alcohol, polyurethane, potash alum, metal–organic frameworks, and zeolites, has provided CDs with interesting fluorescence and more stability in air atmosphere . Notably, we have developed a CDs‐in‐zeolite strategy to generate novel thermally activated delayed fluorescence (TADF) composites with an ultralong lifetime due to the stabilizing effect of the zeolite matrix on the triplet states of CDs .…”

AIEgen‐Based Lifetime‐Probes for Precise Furin Quantification and Identification of Cell Subtypes

“…Moreover, the lifetime values have a good linearity with the concentration of furin in the range of 2.00–4.00 U mL −1 , and the LOD (3σ/ k , where σ is the standard deviation of the blank sample and K is the slope of the calibration curve) is down to 0.12 U mL −1 (inset in Figure 3c). [ 23 ] On the contrary, lifetime signal 2 increased from 4.38 to 13.77 ms, which is closely related to the reduced energy transfer (Figure 3d). τ Z n = 4.4059[furin] − 3.8206, R 2 = 0.96.…”

Metal‐Organic Frameworks‐Based Fluorescent Nanocomposites for Bioimaging in Living Cells and in vivo†

“…To date, different kinds of fluorescent materials such as nanoclusters, nanosheets or quantum dots can be encapsulated into the pores of ZIF‐8 for the detection of ions or small molecules in vitro . [ 48‐51 ] The nanocomposites mentioned above were widely used not only as fluorescent probes in vitro , but also for diagnosis and imaging in vivo . In other words, the nanoscale size, good biocompatibility and pH‐sensitive properties of the ZIF‐8 enable them as ideal platform for fluorescence imaging and cancer therapy applications.…”