Threaded 3D microfluidic paper analytical device-based ratiometric fluorescent sensor for background-free and visual detection of organophosphorus pesticides

Opposite regulation effects of Al3+ on different types of carbon quantum dots and potential applications in information encryption

“…Similarly, the UV-vis spectra of pure DAP and Al 3+ @DAP (Fig. 2b) also show two absorption peaks near 260 nm and 435 nm, 49,50 respectively. The two peaks are separately designated to the p-p* transitions of C]C/C]N and electron transitions in the conjugate structure between the phenazine rings and -NH 2 groups of DAP.…”

Sustainable Sensing with Paper Microfluidics: Applications in Health, Environment, and Food Safety

“…Fluorescence detection is a robust and widely utilized method in paper-microfluidics-based sensors, offering high sensitivity and specificity for detecting various analytes [ 110 , 111 , 112 , 113 , 114 ]. This approach capitalizes on the innate fluorescence properties of specific molecules known as fluorophores, facilitating target substances’ precise identification and quantification.…”

Bright Tunable Multicolor Graphene Quantum Dots for Light-Emitting Devices and Anticounterfeiting Applications

“…Graphene quantum dots (GQDs), as a novel carbon-based nanomaterial, have been widely reported because of their excellent photostability, good biocompatibility, chemical inertness, and low toxicity. − Still now, GQDs have been widely used in LEDs, , bioimaging, , and sensors. , Specially, GQDs show some great potential to be a color conversion layer for WLEDs because they break through the limitation of the traditional phosphors with strong luminescence. Besides, with the increment of anticounterfeiting accuracy in goods, documents, bar codes, and money, the fluorescence inks gradually attract more attention of researchers. − Until now, several luminescent materials including inorganic phosphors, organic dyes, rare earth materials, and semiconductor quantum dots are used for fluorescence inks. ,, Nevertheless, these materials have several disadvantages (high price, complex preparation, potential toxicity, and heavy pollution) that hinder their application fields in everyday life .…”

“…10−13 Still now, GQDs have been widely used in LEDs, 14,15 bioimaging, 16,17 and sensors. 18,19 Specially, GQDs show some great potential to be a color conversion layer for WLEDs because they break through the limitation of the traditional phosphors with strong luminescence. Besides, with the increment of anticounterfeiting accuracy in goods, documents, bar codes, and money, the fluorescence inks gradually attract more attention of researchers.…”