Nitrogen, sulfur, boron and flavonoid moiety co-incorporated carbon dots for sensitive fluorescence detection of pesticides

On-off Fluorescent Switching of Excitation-independent Near-ultraviolet Emission Carbon Nanobelts for Ultrasensitive Detection Nimesulide in Pharmaceutical Tablet

“…And the two peaks at 531.5 and 532.7 eV in the high-resolution O1s spectrum (Fig. 2C) belonged to the C=O/C-OH, and C-O-C groups, 21,22 respectively. The N1s band can be divided into three peaks at 399.8, 400.6, and 401.5 eV, which indicates the existence of C=N, C-N, and -NH2 groups, 19,20 respectively.…”

“…S2). The FT-IR spectrum displays that the NFNCBs consists of many polar functional groups, for example, O-H/N-H bond at 3493 cm -1 , 21,23 C=O bond at 1665 cm -1 , 19 C-O bond at 1062 -1258 cm -1 , 24 which guarantees its excellent water-solubility in polar solvents. The broad absorption peaks at 2921 and 2851 cm -1 belong to the C-H stretching vibrations, and the peak at 864 cm -1 should correspond to the C-H bending vibration.…”

“…The broad absorption peaks at 2921 and 2851 cm -1 belong to the C-H stretching vibrations, and the peak at 864 cm -1 should correspond to the C-H bending vibration. 21,25 The aromatic C=N bond, which exists in the rigid structure, and the carbon nuclei are observed at 1385 -1502 cm -1 , and the stretching vibration of C-N is at 1438 cm -1 . 26,27 All of the above results clearly suggest that our NFNCBs have a large rigidity of structure with lots of oxygen/nitrogen-containing polar groups, which might produce specific optical properties and anisotropy reactivities for NFNCBs.…”

Recent Advances on Detection of Insecticides Using Optical Sensors

“…In this method, spectrofluorophotometer can generate the signal shift and be observed by the naked eye on-site [ 29 ]. Different types of recognition elements and materials have been used in the manufacturing of fluorescence sensors, including enzymes [ 30 ], semiconductor nanomaterials [ 31 ], metal nanomaterials [ 32 ], carbon materials [ 33 ] and noble metal [ 34 ], as it can enhance the sensitivity of the sensor.…”

Rationally designed structure of mesoporous carbon hollow microspheres to acquire excellent microwave absorption performance

“…[5][6][7][8] What is more, the desired microwave absorber can be used in practice at low cost and be easy to fabricate. Recently, there have been numerous research studies about microwave absorbers, including magnetic-based nanomaterials (magnetic alloys, magnetic metals, and magnetic oxides), [9][10][11][12][13][14][15] carbon-based nanomaterials (carbon nanotubes, graphene carbon ber, and porous carbon), 6,[16][17][18][19][20][21][22][23][24] and other special nanomaterials. [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] Magnetic-based nanomaterials, such as CoNi particles, have become one of the best choices of microwave absorbers on account of their unique ferromagnetic features.…”