A Novel Dye-Modified Metal–Organic Framework as a Bifunctional Fluorescent Probe for Visual Sensing for Styrene and Temperature

Abstract

A novel fluorescent probe (C460@Tb-MOFs) was designed and synthesized by encapsulating the fluorescent dye 7-diethylamino-4-methyl coumarin (C460) into a terbium-based metal–organic framework using a simple ultrasonic impregnation method. It is impressive that this dye-modified metal–organic framework can specifically detect styrene and temperature upon luminescence quenching. The sensing platform of this material exhibits great selectivity, fast response, and good cyclability toward styrene detection. It is worth mentioning that the sensing process undergoes a distinct color change from blue to colorless, providing conditions for the accurate visual detection of styrene liquid and gas. The significant fluorescence quenching mechanism of styrene toward C460@Tb-MOFs is explored in detail. Moreover, the dye-modified metal–organic framework can also achieve temperature sensing from 298 to 498 K with high relative sensitivity at 498 K. The preparation of functionalized MOF composites with fluorescent dyes provides an effective strategy for the construction of sensors for multifunctional applications.

Influence of pH on Room-Temperature Synthesis of Zinc Oxide Nanoparticles for Flexible Gas Sensor Applications

“…The (RT.pH13)-based sensor displayed partial recovery after evacuating the gas chamber, while the (RT.pH13.C)-based sensor fully recovered the initial response signal at low C 8 H 8 concentrations. While (RT.pH13)-and (RT.pH13.C)-based sensors were evaluated at RT, the latest styrene sensors that can be potentially used for lung disease diagnosis required elevated temperatures within the range of 120-260 • C [96][97][98]. These high temperatures pose challenges for certain industrial applications and impede the development of flexible sensors on low-cost substrates.…”

Fluorescent chemosensors facilitate the visualization of plant health and their living environment in sustainable agriculture

“…204 Based on the differences in guest molecules, the main types of LG-MOFs include organic dyes@MOF, metal ions@MOF, metal nanoclusters@MOF, quantum dots@MOF and perovskites@MOF. 204–207 Thus far, LMOF-based detection platforms have been developed to evaluate the living environment of plants (Fig. 32).…”

Covalent organic frameworks-based materials for antibiotics fluorescence detection

“…Some specific lanthanide ions can provide narrow emission spectrum with large Stokes shifts through energy-transfer induced D→F transition, from which generates long-time delayed fluorescence with τ in the range of several to hundred μs [ 37 ]. Mostly, Eu 3+ and Tb 3+ [ 38 ] are the most inclined ions to provide such sensitized fluorescence. However, commonly Eu 3+ and Tb 3+ -based materials are usually unstable, easy to photo-bleach and possess narrow light-absorbing range and low photon efficiency.…”

“…Yu et al reported a Eu 3+ -modified bipyridine DPy-TFPB-COF [ 38 ], which acted as an efficient tetracycline ratiometric fluorescent sensor as illustrated in Fig. 1 .…”