Dual-emission carbon dots for sensitive fluorescence detection of metal ions and ethanol in water

Abstract

Carbon dots (CDs) have been widely used in the biomedical fields because of their superior optical properties, high sensitivity and high selectivity to specific substances. However, there are few studies...

Design of a Synthetic Strategy to Achieve Enhanced Fluorescent Carbon Dots with Sulfur and Nitrogen Codoping and Its Multifunctional Applications

“…[ 49 ] This broad absorption peak essentially overlaps with the excitation spectrum of PL, and this absorption behavior reveals that the surface structure of CDs helps to trap energy and produce strong yellow light emission. [ 57 ] In addition, the absorption located at 250–300 nm can be attributed to the π – π * transition of aromatic CC binds, [ 21 ] while the absorption located at 300–350 nm can be assigned to the n– π * transition of CO and CN binds. [ 58 ] After doping by S elements, the optimal excitation of CDs shifted from the original 330 nm (Figure 3a) to 445 nm (Figure 3b), and the corresponding optimal emission also had a redshift from 430 nm (Figure 3a) to 545 nm (Figure 3b), i.e., blue emission red‐shifted to yellow emission.…”

“…Furthermore, CDs possess many functional groups on their surface, such as amino (NH 2 ), hydroxyl (OH), and carboxyl groups (COOH), which are beneficial for CDs to be utilized as fluorescent nanoprobes for detection and analysis. [ 21 ] In addition to this, luminescent nanoparticle‐based security labels have great potential for a wide range of security applications, and luminescent security inks with CDs having excellent luminescence properties can be widely used in the field of anti‐counterfeiting. [ 22 ] Therefore, it is necessary to synthesize multifunctional CDs with applications in sensing and anti‐counterfeiting fields.…”

Green and rapid synthesis of biomass carbon dot-based fluorescence sensing for the sensitive determination of oxytetracycline

“…The peaks at 3431.58 and 2881.15 cm −1 were attributed to the O–H and C–H stretching vibrations, respectively, while the peaks near 1638.54 and 1111.14 cm −1 indicated the stretching vibrations of CO and C–O respectively. 13,23,24 The elemental composition and functional groups of the CDs were also studied by XPS. As shown in Fig.…”

Luminescent Guests Encapsulated in Metal–Organic Frameworks for Portable Fluorescence Sensor and Visual Detection Applications: A Review

“…In recent years, various fast detection techniques have been established for sensitive detection in food safety, environment surveillance, and clinical diagnosis, such as electrochemical analytical methods [ 6 , 7 , 8 , 9 , 10 ], fluorescent analytical methods [ 11 , 12 , 13 ], surface-enhanced Raman spectroscopy [ 14 , 15 , 16 , 17 , 18 ], and so forth [ 19 ]. Due to their high sensitivity, ease of use, and rapid response, fluorescent sensing techniques have been widely used for the detection of metal ions [ 20 , 21 , 22 , 23 , 24 , 25 ], pesticide residues [ 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ], disease markers [ 34 , 35 , 36 , 37 , 38 ], etc. In particular, they have great potential for integrating fluorescent probes and associated detection accessories into portable monitoring systems, such as systems that determine the visual readability of analytes, by using a simple ultraviolet (UV) lamp [ 39 ].…”