Yellow-emissive carbon dots with a large Stokes shift are viable fluorescent probes for detection and cellular imaging of silver ions and glutathione

One-step synthesis of red-emitting carbon dots via a solvothermal method and its application in the detection of methylene blue

“…CDs, with their uorescence capability, are an attractive, carbon-based, functional materials aer the appearance of graphene, carbon nanotubes and nanodiamonds, 1 and they are widely used in various elds due to their multiple preparation routes, low toxicity, excellent biocompatibility and chemical stability. 2 In recent years, the long-wavelength emitting CDs have been the focus of researchers because of their promising potential in cell imaging, [3][4][5] in vivo imaging, 6,7 and in vivo labeling and diagnosis. 8,9 The reports and papers on green, yellow and orange emitting CDs [10][11][12] have been widely seen in published journals, but the ones on red-emitting CDs 13 are relatively scarce.…”

Facile Preparation of Stable Solid-State Carbon Quantum Dots with Multi-Peak Emission

“…As the only N source in the reaction system, formamide participates simultaneously in the synthesis of phthalimide and CQDs. The high-resolution O 1s spectra (Figure 4d) show that most of O in CQDs/PC phosphor exists in the form of C=O (531.6 eV), while C-O (533.6 eV) only accounts for a tiny proportion [32,34]. It can be deduced that there is scarcely any hydroxyl (-OH) or carboxyl (-COOH) in CQDs/PC.…”

“…Compared with the element content of C, N and O in phthalimide crystals (67.6%, 9.9%, 22.5%), the content of C and N are increased in CQDs/PC, which is caused by the existence of CQDs. In the high-resolution C 1s spectra (Figure 4b), the three peaks at 284.8, 285.4 and 288.4 eV correspond to C-C/C=C, C-N/C-O and C=N/C=O, respectively [32,33]. The three peaks in the N 1s spectrum (Figure 4c) indicate that the N atoms in CQDs/PC phosphor are mainly in the forms of pyridine N (398.3 eV), pyrrole N (399.5 eV) and graphite N (400.2 eV) [34].…”

Ratiometric Fluorescent Sensor for Al3+ Based on the Inner Filter and Static Quenching Effects of Carbon Dots Obtained from Neem Leaves

“…In recent years fluorescent carbon dots (CDs) have been attracted more attentions owing to their advantages of stable optical properties, tunability, easy synthesis, great aqueous stability, good biocompatibility, low toxicity, strong fluorescence emission properties and widely used in biomedicine, catalysis and sensing. [16][17][18][19][20] Although CDs can be prepared by various synthesis routes including arc discharge, combustion, microwave pyrolysis, laser ablation, and plasma treatment. [21][22][23][24] Recently, the synthesis of CDs with a hydrothermal method is known as facile, efficient and green.…”