Green and facile microwave assisted synthesis of (metal-free) N-doped carbon quantum dots for catalytic applications

Synthesis, Characterization and Ecotoxicity Evaluation of Biochar-Derived Carbon Dots from Spruce Tree, Purple Moor-Grass and African Oil Palm

“…The existence of C-O-C bonds leads to the absorption peak at 990 cm −1 for Elaeis guineensis C-Dots and 1045 cm −1 for Picea and Molinia caerulea C-Dots [83,84], and the peak at 1236 cm −1 is associated with C-O stretching [85,86]. One of the most intense peaks of all the spectra occurs at 1370 cm −1 which corresponds to C-N [87][88][89]; the bands located around 1550-1750 cm −1 are assigned, for some authors to C=N [89,90], while other authors associated these bands with the stretching vibration of C=C and carbonyl bonds (C=O) [83][84][85]91]. Moreover, the band around 1700 cm −1 could indicate the vibration of the carbonyl bond of a carboxylic acid, however, because it's weak, it could represent the deprotonation of the group and the apparition of the carboxylate group (COO − ) [20].…”

Gamma irradiation of graphene quantum dots with ethylenediamine: Antioxidant for ion sensing

“…Among different strategies to achieve improved PL features, the heteroatoms incorporation within the GQD structure is broadly investigated [32][33][34][35]. There are already several reports in the literature where S, N, B, P, Se, and other atoms were incorporated within carbon-based quantum dots during GQDs synthesis [36][37][38][39][40].…”

Electrochemiluminescence of Carbon‐based Quantum Dots: Synthesis, Mechanism and Application in Heavy Metal Ions Detection

“…Generally, carbon quantum dots (CQDs), graphene quantum dots (GQDs), and graphitic carbon nitride quantum dots (g-CNQDs) are considered to be the three major kinds of carbon-based quantum dots. Over the past decades, great progress has been made in the synthesis of carbon-based quantum dots [21][22][23][24][25]. Synthesis of carbonbased quantum dots can be achieved in one of two ways, by using a "top-down" or "bottom-up" approach.…”

“…For example, Lu et al prepared CQDs by a microwave-assisted method using glucose as precursor and polyethylene glycol as a passivator [36]. "bottom-up" methods hydrothermal synthesis alanine and ethylenediamine simple operation high temperature and pressure [24] microwave synthesis 3,4-dihydroxy-Lphenylalanine faster rates, conditions milder small-scale preparation [25] Fig (N-GQDs) by the hydrothermal synthesis cutting of nitrogen-doped graphene for the first time [42]. However, these methods similarly required the use of strong acids and bases.…”