Two kinds of biomass-derived carbon dots with one-step synthesis for Fe3+ and tetracyclines detection

Natural Nitrogen-Doped Carbon Dots Obtained from Hydrothermal Carbonization of Chebulic Myrobalan and Their Sensing Ability toward Heavy Metal Ions

“…Various surface/edge functional groups such as carbonyl (C=O), hydroxy (–OH), carboxyl (O–C=O), and amino (N–H) of the NN-CDs coordinated with the Fe 3+ ions [ 63 ]. The electron donors of the oxygen and nitrogen chelating groups formatted the covalent bond with the Fe 3+ ions compared with the other metal ions due to its greater affinity [ 64 ]. During the formation of new bonds, the excited electrons on the surface of the NN-CDs migrated to the vacant (half-filled) 3D orbitals of the Fe 3+ ions, facilitating the nonradiative recombination of the excitons (electron/hole) [ 65 ].…”

Construction of a stable fluorescent sensor based on CsPbBr3/CdS core/shell quantum dots for selective and sensitive detection of tetracycline in ethanol

“…Quantum dots (QDs) are widely used in the eld of sensing [18][19][20][21] due to their excellent optical properties such as a broad excitation spectrum, a narrow emission spectrum, adjustable emission wavelength, and resistance to photobleaching. At present, various uorescent materials including semiconductor QDs, [22][23][24] carbon dots 25,26 and silicon QDs 27,28 have been used for uorescence detection of TC. However, the uorescence quantum yield of conventional QDs is low, and the sensitivity of the sensor will decrease aer surface modication.…”