Green preparation of carbon quantum dots with wolfberry as on-off-on nanosensors for the detection of Fe3+ and l-ascorbic acid

Production and Characterization of Biotinylated Anti-fenitrothion Nanobodies and Development of Sensitive Fluoroimmunoassay

“…33,34 The 1350 and 1020 cm −1 peak indicate C−O and C−N, respectively. 33,35 The stretching vibration band of C−O−C located at 1000−1270 cm −1 demonstrated that rCDs have ether groups. 34,36 The chemical composition was further examined by XPS.…”

Direct and Sensitive Detection of Dopamine Using Carbon Quantum Dots Based Refractive Index Surface Plasmon Resonance Sensor

“…The existence of abundant hydroxyl groups at the CQD surface was verified by the presence of the characteristic bands of O–H at the 3929, 3780, 3678, 3530 and 3175 cm −1 peaks [ 52 , 53 , 54 , 55 , 56 ]. The peaks appearing at 3031 and 2882 cm −1 were attributed to C–H stretching vibration [ 52 , 55 , 56 , 57 , 58 , 59 , 60 ]. The peak located around 2158 cm −1 corresponds to the stretching frequency of alkyne C≡C groups [ 61 , 62 ], and the peak at 2016 cm −1 originated due to C=O stretching of the carboxyl group [ 63 ].…”

“…The peak located around 2158 cm −1 corresponds to the stretching frequency of alkyne C≡C groups [ 61 , 62 ], and the peak at 2016 cm −1 originated due to C=O stretching of the carboxyl group [ 63 ]. The available peaks at 1682 and 1585 cm −1 were ascribed to C=C and C=O bond stretching [ 58 , 64 ]. In addition, the peaks appearing at 1491 and 1412 cm −1 were due to C–C stretching [ 65 ].…”

“…The peaks appearing at 1337 cm −1 originated due to C=C vibration [ 66 ]. The peaks at 1192 and 1028 cm −1 were attributed to C–O–C stretching vibrations [ 56 , 58 , 60 , 67 ], and the peaks located at 886 and 691 cm −1 corresponded to C–H bending vibrations [ 55 ]. The FTIR spectrum obtained for CQD film after exposure to DA (red spectrum) showed a reduction in the intensity of the O–H stretching band at 3780 cm −1 due to the overlap with the N–H stretching vibrations.…”

Natural deep eutectic solvent assisted synthesis and applications of chiral carbon dots

“…The existence of various components in natural raw materials (especially traditional Chinese medicines) makes the prepared CDs have good water solubility, biocompatibility, and photoluminescence properties, which can improve the sensitivity and selectivity of CDs to target molecules. 19 Thus, NADESs coupled with green raw materials (green precursors) may provide a new pathway for the preparation of new CCDs. The variety of active components ( e.g.…”